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8845A/8846A and Fluke

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1. I soft key At this point all the RS 232 settings are made available Note All RS 232 port parameter settings are non volatile and remain set until changed Setting RS 232 Baud Rate To set the baud rate 1 With the RS 232 set up menu displayed press BAUD RATE There are eight pre defined settings 1200 2400 4800 9600 19200 38400 57600 115200 and 230400 These selections are displayed in two separate menus When first entering baud rate selection baud rates 9600 to 1200 are displayed To get to the next five higher baud rates press MORE To get back to the lower baud rates press BR 2 With the desired baud rate displayed press the soft key under the chosen baud rate Digital Multimeter Configuring the RS 232 Port Setting RS 232 Parity and Data Bits To set the data bits 1 With the RS 232 set up menu displayed press FAR IT DATA BIT 2 Press the soft key under the desired parity and data bit parameter IE SE DATA No parity with 8 data bits DATA Odd parity with 7 data bits FE DATA Even parity with 7 data bits Setting RS 232 Stop Bits To set the stop bits 1 With the RS 232 set up menu displayed press FAR ITY DATAEBIT 2 Press the soft key labeled STOF ET TE to toggle between 1 and 2 stop bits Note en 2 STOP BITS is highlighted the interface is configured to use 2 stop Setting RS 232 Flow Control To set flow control 1 With the RS 232 set up menu displayed press FL U
2. CES buffer loaded with any Device command received or Bus or data Readings Error rear panel trigger or Output buffer is messages Get responses read An error condition occurs At the Device command received or Output same time the output buffer is buffer is read loaded with an error message This sets bit 5 SRQ mask enabled bit is All SRQ mask enabled bits are cleared Digital Multimeter FLUKE 8842A Emulation Mode The SRQ Mask The SRQ mask is a two digit integer that specifies which conditions will generate a service request The SRQ mask is entered using the P1 command and can be read with the Gl command The conditions corresponding to each SRQ mask value are listed under G1 in Table 30 The SRQ mask can enable any combination of serial poll register bits 1 through 6 Its six bit binary representation is ANDed bit for bit with serial poll register bits 1 through 6 whenever the output buffer is loaded If any mask enabled bit in the serial poll register comes true the RQS bit bit 7 is set true generating a service request Example Explanation N32 PI An SRQ is generated if an error is generated The string sets the SRQ mask to 32 which is 100000 in binary This mask is ANDed with the lower six bits of the serial poll register The mask thus enables bit 6 the Any Error bit The SRQ mask codes can be added to select combinations of conditions Example Explanation N33 PI An SRQ is generated
3. Example Explanation 1000 CR LF 1 Leading 1 0 Leading 0 0 Not in cal verification 0 Cal mode disabled G5 Get IAB Status 82 The GS command loads the output buffer with the IAB status in the format shown in Figure 7 As Table 30 explains the IAB status is a four character string which indicates the status of the FRONT REAR switch front or rear analog inputs selected the autorange feature autorange on or off and the OFFSET feature OFFSET on or off The first digit is always 1 An example output string follows Example Explanation Digital Multimeter FLUKE 8842A Emulation Mode 1011 CR LF 1 Leading 1 0 FRONT inputs 1 Autorange off 1 OFFSET feature on It is useful to know whether autorange is on or off because this information is not available from the GO command For example the GO command could indicate that the Meter was in the 200 mV range but it would not indicate whether the Meter was in autorange or manual range G6 Get YW Status The G6 command loads the output buffer with the YW status in the format shown in Figure 7 The YW status is a four character string which indicates which terminators are selected and whether the output suffix is enabled or disabled as shown in Table 30 The first two digits are always 1 and 0 An example output string follows Example Explanation 1015 CR LF 1 Leading 1 0 Leading 0 1 Y1 enable output suffix 5 W5 enable LF only G7 Get Error Status The G7
4. OFF and 1 ON 64 Digital Multimeter Supported SCPI Commands CALibration STRing lt quoted string gt Description Store calibration information in the Meter s memory This setting is stored in non volatile memory Parameters lt quoted string gt Up to a 40 character string Query CAL STR Retrieves the Meter s calibration string CALibration DATE lt date gt Description Sets the calibration date on the 8845A only since it does not have a real time clock Parameters lt date gt MM DD YYYY or MM DD YYYY MM between 1 and 12 DD between 1 and 31 YYYY between 1970 and 2038 Examples CAL DATE 10 25 2007 Query CAL DATE Returns the Meter s calibration date CALibration VALue lt mode gt lt value gt Description Sets up the Meter for a calibration point The mode parameter is the name of the functional group being calibrated The value parameter is the Meter s range for the calibration point Refer to the calibration procedure in the 88454 8846A Service Manual for mode names and values Parameters lt mode gt See 88454 8846A Service Manual lt value gt See 88454 8846A Service Manual Query CAL VAL Retrieves the Meter s calibration value CALibration STEP lt step gt Reference Description Specifies the calibration step number and the optional reference value of the known calibration signal used by the calibration procedure See the 8845A 8846A Service Manual for a list of calibrati
5. Table 23 Range and Measurement Rate Commands and Queries cont Command Description RANGE1 Returns the range presently selected on the primary display RANGE2 Returns the range presently selected on the secondary display If the secondary display is inactive an Execution Error is generated RATE lt speed gt Sets the measurement rate to lt speed gt RATE lt speed gt is either S for slow 2 5 readings second M for medium 5 readings second or F for fast 20 readings second S M and F can be sent as either upper or lower case letters Any other entry for lt speed gt generates an Execution Error RATE Returns lt speed gt as S for slow 2 5 readings second M for medium 5 0 readings second or F for fast 20 readings second Measurement Queries The commands in Table 24 cause the Meter to return readings shown on the primary and or secondary displays Table 24 Measurement Queries Command Description MEAS1 Meter returns the value shown on the primary display after the next triggered measurement is complete MEAS2 Meter returns the value shown on the secondary display after the next triggered measurement is complete If the secondary display is off an Execution Error is generated MEAS If both displays are on the Meter returns the value shown on both displays after the next triggered measurement is complete in the format selected These values are separated by a comma
6. measurement has not been completed COMPCLR Meter exits compare function and restores display to normal operation COMPHI Sets HI compare COMP value to lt high value gt where lt high value gt can be a signed lt high value gt integer signed real number without exponent or signed real number with exponent COMPLO Sets LO compare COMP value to lt low value gt where lt low value gt can be a signed lt low value gt integer signed real number without exponent or signed real number with exponent Trigger Configuration Commands The commands in Table 26 set and return the trigger configuration Table 26 Trigger Configuration Commands Command Description TRIGGER Sets the trigger configuration to lt type gt lt type gt lt type gt corresponds to a number between 1 and 5 selected from Table 26A If the lt type gt entered is not one of these listed numbers an Execution Error is generated Table 26A Trigger Type Type Trigger Rear Trigger Settling Delay 1 Internal 2 External Enabled Off 3 External Enabled On 4 External Enabled Off 5 External Enabled On 1 Although the Fluke 45 disabled the rear panel trigger for these trigger types the 8845A 46A leaves the rear panel trigger enabled When the input signal is not stable select a trigger type with the settling delay type 3 or 5 enabled before a measurement is triggered TRIGGER Returns the
7. or With the desired character selected press the soft key labeled to decrement the character or to increment the character 3 Press the EHTER soft key The new Host Name will not take effect until the Meter has been powered down and back up again using the rear panel power switch Reading the MAC Address The MAC Address is set at the factory and cannot be changed To read the MAC Address 1 From the LAN Port setup menu press MORE 2 Press the MAC ADORE soft key 3 Press to return to the LAN Port setup menu Configuring the LAN Default Gateway The default gateway IP address is the IP address of a gateway router attached to the same network as the device When the instrument detects that a host computer is not on the same network using the network number the data is sent through the gateway to reach the host computer The default for the Meter is 0 no gateway and subnetting is not being used To set the LAN Default Gateway address 1 From the LAN Port setup menu press MORE 2 Press GATEWAY 3 To select the digit to adjust press either or With the desired digit selected press the soft key labeled to decrement the digit or to increment the digit 4 Press the ENTEH soft key The new gateway address will not take effect until the Meter has been powered down and back up again using the rear panel power switch Configuring the General Network Socket Port In order to comm
8. 32 SRQ on any error Numeric data is always in volts amps or ohms The terminators CR LF and EOI are selected with the Terminator Commands Wn The suffix defined below is enabled with the Y1 command and disabled with the YO command Default YO Suffix Format V de V ac Ohm IDC IAC Function Indicator gt Reading is overrange 2 200 000 counts lt space gt Reading is not overrange but can be over voltage gt 1000 V dc or 700 Vac Leading Comma Always present in suffix Most versions of BASIC expect multiple input values to be separated by commas e g input I N S to acquire the numeric portion and suffix string caw67 eps Figure 7 8842A Emulation Data Output Format 80 Digital Multimeter FLUKE 8842A Emulation Mode Table 30 8842A Get Commands frst f 1 6 for function selection Go r 1 6 for selected range s 0 2 for selected measurement rate t 0 4 for selected trigger mode nn 00 for SRQ disabled 01 for SRQ on overrange 16 for SRQ on data available 32 for SRQ on any error Note SRQ mask values may be added for combinations Example 33 for SRQ on overrange or any error Not supported in 8842A emulation mode G3 BEE EZ 8 2008 Can t set user defined message in 8842A emulation G4 10vm v 0 Not in cal verification m 0 Not in calibration mode 1iab i 0 Front panel inputs selected 1 Rear panel inputs selected G a 0 Autorange on
9. Factory settings Flow Control Setting of Hl Parity Setting of Terminal Mode Selecting of Bl S Safety Information N Symbols T Terminators Input Triggering Output 8845A 8846A Programmers Manual
10. o Sehe Not Used No Connect 9 Keys DCD Data Carrier Detect Data Set Ready RxData Receive Data Request to Send TxData Transmit Data Clear to Send DTR Data Terminal Ready Ring Indicator GND Circuit Ground caw058 eps Figure 1 RS 232 Pin out and Cable Interconnect Configuring the Ethernet LAN Port The Meter can be remotely controlled through the LAN port on the Meter s rear panel To select the LAN port as the remote control port see the Selecting the Remote Interface section above Configuring the LAN port is accomplished through the Instrument Setup function The selectable LAN port parameters are DHCP Dynamic Host Configuration Protocol IP Address Net mask Host Name Mac Address Gateway Port number and Domain When setting IP addresses subnet masks and default gateways on the Meter keep in mind they are stored as 32 bit binary numbers and expressed as four 3 digit segments in 12 Digital Multimeter Configuring the Ethernet LAN Port dot notation form For example xxx xxx xxx xxx where xxx is a byte value is stored as a 32 bit binary number To set the LAN port parameters 1 Press sear 2 Press the FORT IF soft key 3 Press the LAM soft key Note When addressing some LAN addresses computers will often interpret 0 s in the IP address as OCTAL values As an example if you configure your IP address from the front panel as 129 196 017 023 and then attempt to
11. sensenneeneeennen Capability Commands ss Interconnections u irin enik E nennen Configuring the RS 232 Port Setting RS 232 Baud Rate Setting RS 232 Parity and Data Bits nr 7 Setting RS 232 Stop Bils u uanenn ai ennemie Setting RS 232 Flow Control Setting RS 232 End Of Line Character nseenenenenesensennn Enabling and Disabling Fluke 45 Emulation Echo RS 232 Modes of Operation Operating with FlukeView Forms Interconnections u a HS ead asda E Configuring the Ethernet LAN Port 12 Setting the IP Address uses eue entente Setting the LAN Subnet Mask Reading the Domain Name is Configuring the Host Name Reading the MAC Address Configuring the LAN Default Gateway ucneensenseeseenneennnnennennenn nenne Configuring the General Network Socket Port Establishing an Ethernet Connection Terminating an Ethernet Connection Selecting the Programming Language nn Getting Started With an Installation Test Installation Test for RS 232 Connections seensssessensensensnnnnensennnnn 8845A 8846A Programmers Manual Installation Test for IEEE 488 Connections Th The Test Pas Baia an How the Meter Processes Input uuuneesssenseensennnennnennnenennennnnnnnnen nennen nn Input Strings cesceevcasgauies ena eienn e eanan ENEEK EREE ENEKE ASEEN EENE EEEE het Input Terminators sierici ini een E EA ani Typical IEEE 488 Input Strings 0 0 0 0 cccecsseesseceseceseceecea
12. 1 Autorange off manual ranging b 0 Offset off 1 Offset on 10yw y 0 Output suffix disabled G6 1 Output suffix enabled w 0 5 Selected terminator command FLUKE 8842A nnnnnnn V5 0 nnnnnnn Instrument serial number 1 The 8845A and 8846A have an error queue of 16 For multiple errors G7 will dequeue the errors one by one but will not clear the ERROR indicator on the front panel when the queue is empty X0 clears the ERROR annunciator The output data from some Get commands starts with a leading 1 or 10 This prevents the controller from suppressing leading zeroes and gives a uniform four character length to all instrument configuration data the data from Get commands G0 G4 G5 G6 and G7 The Get commands are described further in the following paragraphs For more information about output data see Syntax Rules later in this section GO Get Instrument Configuration The GO command copies the function range reading rate and trigger mode of the Meter into the output buffer in the format shown in Figure 7 The four digits returned represent the arguments for the equivalent F R S and T commands as shown in Table 30 An example output string follows Example Explanation 3410 CR LF 3 F3 2 Wire kQ function 81 8845A 8846A Programmers Manual 4 R4 200 kQ range 1 S1 Medium reading rate 0 TO Continuous trigger The second digit which can vary from 1 to 6 indicates what measurement range the Met
13. 6 digits MIN Gate time of 10 ms 4 2 digits MAX Gate time of 1 second 6 digits Examples FREQ APER 0 1 Sets the frequency measurement gate time to 100 ms Query FREQ APER Returns the gate time for the frequency function SENSe PERiod APERature lt n gt Description Sets the gate time for the period function to the value specified by lt n gt This setting is stored in volatile memory Parameters lt n gt 0 01 Gate time of 10 ms 4 2 digits 0 1 default Gate time of 100 ms 5 2 digits 1 Gate time of 1 second 6 digits MIN Gate time of 10 ms 4 2 digits MAX Gate time of 1 second 6 digits 46 Digital Multimeter Supported SCPI Commands Examples PER APER 0 1 Sets the period measurement gate time to 100 ms Query PER APER Returns the gate time for the period function SENSe CURRent AC BANDwiath lt n gt Description Sets the appropriate filter for the frequency specified by lt n gt This setting is stored in volatile memory Parameters lt n gt 3 Selects slow filter 20 default Selects medium filter 200 Selects fast filter MIN Selects slow filter MAX Selects fast filter Examples CURR AC BAND 200 Sets the filter for ac current to fast Query CURR AC BAND Returns the filter selection SENSe VOL Tage AC BANDwiath lt n gt Description Sets the appropriate filter for the frequency specified by lt n gt This setting is stored in volatile memory Parameters lt n gt 3 Selects s
14. Clear Status Clears all event registers summarized in the status byte except for Message Available which is cleared only if CLS is the first message in the command line ESE lt value gt Event Status Enable Sets Event Status Enable Register to lt value gt an integer between 0 and 255 where lt value gt is an integer whose binary equivalent corresponds to the state 1 or 0 of bits in the register If lt value gt is not between 0 and 255 an Execution Error is generated EXAMPLE decimal 16 converts to binary 00010000 Sets bit 4 EXE in ESE to 1 Event Status Enable Meter returns the lt value gt of the Event Status Enable Register Query set by the ESE command where lt value gt is an integer whose binary equivalent corresponds to the state 1 or 0 of bits in the register Event Status Meter returns the lt value gt of the Event Status Register and Register Query then clears it The lt value gt is an integer whose binary equivalent corresponds to the state 1 or 0 of bits in the register 68 Digital Multimeter FLUKE 45 Command Emulation Summary Table 20 IEEE 488 2 Common Commands cont Command IDN OPC OPC RST Name Identification Query Operation Complete Command Operation Complete Query Reset Description Meter returns the identification code of the meter as four fields separated by commas These fields are manufacturer FLUKE model 45
15. Enabled Off 3 External Enabled On 4 External Enabled Off 5 External Enabled On 1 Although the Fluke 45 disabled the rear panel trigger for these trigger types the 8845A 46A leaves the rear panel trigger enabled Using FlukeView Forms 76 You can use FlukeView Forms to download and store readings from the Meter to a PC running MicroSoft s Windows operating system FlukeView Forms Basic Documenting Software must first be installed on the PC Refer to the FlukeView Forms Installation Guide to install FlukeView Forms on your Windows PC Note The Meter s RS 232 port must be enabled and properly configured before FlukeView forms will communicate with the Meter In addition the Fluke 45 command language must be selected in the Meter To connect and configure the Meter to the PC with the installed FlukeView Forms Basic Documenting Software 1 Connect a null modem cable between the RS 232 port of the Meter and the PC s RS 232 port 2 Open FlukeView Forms Documenting Software 3 The current COM serial port setting is displayed at the bottom right of the FlukeView Forms Basic window Double click on it to change the COM port setting to the virtual COM port used by the null modem cable 4 Turn the Meter on 5 Select the Fluke 45 Command language by following the instructions in the Selecting the Program Language section of Chapter 3 of the Users Manual Digital Multimeter FLUKE 8842A Emulation
16. Meter returns a binary weighted integer that represents the enabled bits in the register The value of bit 6 will always be zero Convert the returned value to binary to determine the status of register bits EXAMPLE EXPLANATION SRE Reads the value of the SRE Register Assume 32 is returned Converting 32 to the binary 00100000 indicates that bit 5 in the SRE is set to 1 Supported SCPI Commands This section explains the SCPI Standard Commands for Programmable Instruments commands available to program the Meter This section includes the following information e A list of the supported SCPI Commands e A discussion of how to use the command set e A detailed description of each command in the set e Error handling for the 8845A 8846A Note Throughout this document the following conventions are used for SCPI command syntax Square brackets indicate optional keywords or parameters Braces enclose parameters within a command string Triangle brackets lt gt indicate that you must substitute a value for the enclosed parameter SCPI Command Summary Tables 7 through 16 summarize the SCPI commands implemented in the 8845A and 8846A Digital Multimeters Table 8 CALibration Command Summary CALibration on off Perform a calibration CALibration Path to the calibration function COUNt Retrieves number of times Meter has been calibrated RECord Records calibration values SECure Path to calibration security
17. RST reset command has been executed 420 Query The Meter was addressed to talk i e to send data over the UNTERMINATED interface but a command has not been received which sends data to the output buffer For example a CONFigure command which does not generate a response may have been executed followed by an attempt to read data from the remote interface 430 Query DEADLOCKED A command was received that generated too much data to fit in the output buffer and the input buffer is also full Command execution continues but all data is lost 440 Query The IDN command must be the last query command within a UNTERMINATED after command string Example IDN SYST VERS indefinite response RTC Time Error setting the RTC System time RTC Data Error setting the RTC System date 31 mA AC DC selected 8842A emulation error The Front Rear input switch was set to while REAR inputs REAR while ac dc current was selected via a remote command selected or ac dc current was selected and the Front Rear switch was switched to REAR 97 8845A 8846A Programmers Manual 98 Table 33 Execution Error Codes and Descriptions cont Offset selected while 8842A emulation error The B1 offset command was entered reading when a measurement wasn t available such as external unavailable overrange triggering without a previous measurement or the previous measurement resulted in an overload condition 8840 CALibration 8842A emulation erro
18. Standard Event register Returns a one to the Meter s output buffer OPC A 1 is placed in the output buffer of the Meter Enables or disables the clearing of the Status Byte Enable register and Standard Event Enable register when Meter power is turned on This setting is stored in non volatile memory lt n gt 0 Disables clearing Status Byte and Standard Event Enable register at power up 1 Enables clearing Status Byte and Standard Event Enable register at power up Digital Multimeter Supported SCPI Commands PSC Description Returns the state of the clearing of the Status Byte and Standard Event Enable registers at power up Examples PSC Returns zero if clearing is disabled Returns one if clearing is enabled SRE lt enable value gt Description Enables or disables bits in the Meter s Status Byte enable register Parameters lt n gt Oto 255 Binary weighted decimal value representing the bits to set in the register Although this register has 8 bits and will accept a number from 0 to 255 only bits 3 through 5 are used Examples SRE 48 Sets bits 4 and 5 to one and all other bits to zero SAE Description Retrieves the value in the Meter s Status Byte enable register Examples SRE Retrieves a binary weighted decimal value representing the bits set in the enable register STB Description Retrieves the value in the Meter s Status Byte summary register Although like a serial poll this
19. and continuous trigger The PO command allows broadside loading of the Function Range Reading Rate and Trigger Mode commands F R S and T The codes for these commands are listed in Figure 6 A numeric entry for PO must be within 1000 and 6824 Each of the four digits must not exceed its maximum allowed value 6 8 2 and 4 respectively or an error message will occur and the instrument configuration will remain unchanged The entry may be expressed as an integer real number or real number with exponent as described under the N command Any fractional part is ignored Example Explanation N3112 PO Sets the Meter to F3 R1 S1 and T2 84 Digital Multimeter FLUKE 8842A Emulation Mode P1 Put SRQ Mask Format Explanation N lt SRQ mask gt P1 Where lt SRQ mask gt is a two digit integer from 00 to 63 The Pl command is used to program the 8842A to make service requests on user specified conditions The two digit code for the SRQ mask is interpreted in Table 30 under the G1 command For more about the SRQ mask see the SRQ Mask section later in this section Numeric entries for the Pl command must be between 0 and 63 inclusive or an error will occur and the SRQ mask will remain unchanged The entry may be expressed as an integer real number or real number with exponent as described under the N command Any fractional part is ignored Example Explanation NO 17E 2 P1 Sets SRQ mask to 17 Enab
20. and its argument is required The PRINT command sends a terminator at the end of the string EXAMPLE 1 The following string configures the Meter and triggers an ohms reading to be shown on the primary display when the Meter is in 8845A or 8846A command mode PRINT 3 RST CONF RES 1 RES NPLC 1 TRIG SOUR BUS INIT TRG FETCH IEEE 488 bus address Reset to power up configuration Select Q function 1 ohm range Select 1 PLC measurement rate Select Bus triggering Wart for trigger state Trigger a reading Return reading shown on primary display EXAMPLE 2 The following string configures the Meter and triggers an ohms reading to be shown on the primary display when the Meter is in Fluke 45 emulation mode PRINT 3 RST OHMS RANGE 1 RATE M TRIGGER 2 TRG VAL1 IEEE 488 bus address Reset to power up configuration Select Q function Select 3009 range Select medium reading rate Select external trigger Rear panel trigger disabled no trigger delay Trigger a reading Return reading shown on primary display aam19f eps Figure 2 Typical IEEE 488 Input String 21 8845A 8846A Programmers Manual How the Meter Processes Output The following paragraphs summarize how the Meter processes output The Meter outputs an alphanumeric string in response to a query command from the host Query commands are easily identified because they all en
21. applied to the address the network ID is extracted as 198 178 246 and the host ID as 10 The default gateway information is only used when your network contains more than one subnet or is connected directly to the public Internet When the network ID of the source and destination address of a packet are different hosts on different network segments the packet is forwarded to the default gateway for delivery The default gateway has knowledge of the network IDs of the other network segments so it forwards the packet to other gateways on the network until the packet is delivered to the gateway attached to the destination segment with the matching network ID This process is generally referred to as routing the packet and devices that do this are also referred to as Routers In many modern networks the use of subnet masking and the default gateway is not necessary These networks contain routers and gateways that support the proxy ARP protocol In this protocol the routing path between any two hosts is automatically Digital Multimeter Network Primer established by the routers during the ARP process As a result the user does not need to manually enter the subnet mask and default gateway information When the TCP IP protocol stack software starts operation it communicates with an NDIS or ODI driver in a process called binding During this process the stack tells the driver which protocol it is handling In this way a driver can direct pa
22. are calibrating CAL Abort Calibration aborted 101 8845A 8846A Programmers Manual 102 Appendix B Fluke 45 Emulation Limitations Introduction Due to differences in their design the 8845 A and 8846A collectively the 884XA cannot emulate all of the functions and features of the Fluke 45 Some functions are compatible but are not implemented the same in the 884XA meters This appendix covers the differences with the Fluke 45 giving a list of command s that are not compatible and information on those functions that the 884XA responds differently to Incompatible Fluke 45 Commands Due to their design differences there are Fluke 45 function and modifier commands that the 884XA meters will not execute Whenever a non compatible command is detected by the 884XA meters they will generate a 102 syntax error Table 36 lists Fluke 45 commands that are not compatible with the 8845A and 8846A Table 36 Non compatible Fluke 45 Remote Commands CE See the section on Math Operations for an appropriate replacement See the section on Math Operations for an appropriate replacement MAXSET See the section on Math Operations for an appropriate replacement MINSET See the section on Math Operations for an appropriate replacement MINCLR See the section on Math Operations for an appropriate replacement VACDC The 884XA meters do not have an ac plus dc rms voltage function Dual Functions In addition to the non c
23. auto 0 Turn Autozero off trig sour imm Set immediate trigger trig del 0 Set trigger delay to zero trig coun Set trigger count to one or specify a larger number disp off Turn display off This may slightly improve reading rate syst rem Put the 8846A in remote Only needed for RS 232 or Ethernet required for READ or MEAS samp coun 100 Set the sample count from 1 to 5000 INIT OPC OPC returns 1 indicating that the measurements have been taken and are ready to be transferred to the computer using the FETCH command FETCH Note For any sample count greater than 1 measurements are returned comma separated 8845A 8846A Programmers Manual Selecting the Remote Interface Port To enable or select a port for remote control of the Meter 1 Press kit 2 Press F RT or LAN Port selection is non volatile Therefore the selected port will remain active until another port is selected through the front panel Configuring the IEEE 488 Port The IEEE 488 interface is designed in compliance with supplemental standard IEEE 488 2 Devices connected to the bus in a system are designated as talkers listeners talker listeners or controllers The connector for connecting the Meter to the IEEE 488 bus is located on the rear panel Under control of an instrument controller the Meter operates exclusively as a talker listener on the IEEE 488 bus The Meter conforms to the Standard Specification IE
24. be highlighted in the display Pressing HCF will toggle between enabled and disabled Note After changing any Ethernet setting except the socket port the Meter must be powered off and on again using the rear panel power switch to make the change active Setting a Static Internet Address The Meter comes from the factory with 000 000 000 000 in the static IP address register Note Ifyou are planning to use the Meter on a corporate LAN and do not wish to use DHCP contact your network administrator for a static IP address to be used exclusively by your Meter DHCP must be disabled to set a static IP address 13 8845A 8846A Programmers Manual To change the Meter s static IP Address 1 2 From the LAN Port setup menu press the I FATF soft key Use the soft keys to set the IP Address as follows To select the address character to adjust press either or gt With the desired digit selected press the soft key labeled to decrement the digit or to increment the digit Press the ENTER soft key Note The IP address is stored in non volatile memory and does not change when power is removed and reapplied to the Meter or when the Meter receives an RST command Setting the LAN Subnet Mask If communication between the host computer and the Meter passes through a router or gateway and DHCP is disabled you must set the subnet mask and default gateway address on both the host computer and the Meter
25. command header is not formed properly and fails to pass header syntax rules Example SAMP COUN 1 or CONF VOLT DC Missing parameter Fewer parameters were received than expected for the command One or more parameters were omitted that are required for this command Example SAMP COUN Parameter type A parameter within the command does not match a valid type of parameter for the command specification For example a command expected numeric data and received character data instead Example SAMP COUNT A 120 Numberic invalid One or more values in a numeric channel list parameter is invalid e g floating point when not allowed Numeric value overflow The command contains a parameter of type Numeric Value that was too large to be stored internally This occurs if the value has an exponent greater than 43 Example SAMP COUNT 1e50 125 Numeric negative A negative numeric parameter value was entered Example SAMP COUN 3 95 8845A 8846A 96 Programmers Manual Table 33 Execution Error Codes and Descriptions cont 126 Numeric real A floating point real numeric parameter value was entered Example SAMP COUN 13 6 127 Channel dimension One or more entries in a channel list parameter has an invalid invalid number of dimensions Parameter suffix A parameter within the Input Command had the wrong type of units for the Command Specification Example VOLT DC RANGE 1A Invalid header suffix Too many numeric suffices
26. command is processed as an instrument command Returned results are the same as when receiving a serial poll but the SRQ bit is not cleared if a serial poll has occurred Examples STB Calibration Commands CALibration ONJOFF Description After entering the proper code using the CAL SEC CODE command this command causes the Meter to perform an adjustment using the values supplied with the CAL VAL command See the 88454 8846A Service Manual for details on using this command Parameters lt n gt ONorl Execute only one calibration step OFF or 0 Execute a group mode of related calibration steps at one time Examples CAL ON Execute one calibration step for the calibration group specified by the CAL VAL command CAL Returns 0 good or 1 failed 63 8845A 8846A Programmers Manual CALibration COUNt Description Retrieves the number of times Meter points have been calibrated Read this value just after receiving the Meter to obtain a starting value This setting is stored in non volatile memory Note This value increments once for each calibration point A complete calibration will increment this value many times The maximum count is 4 294 967 295 at which point the next calibration causes this value to reset to zero Examples CAL COUN Retrieves the number of times points have been calibrated CALibration RECord Description Stores the calibration values Example CAL REC Stores all of the Meter s chan
27. for de current functions This setting is stored in volatile memory Parameters lt n gt OFFor0 Turns the analog dc current filter off ON or 1 Turns the analog de current filter on Examples CURR FILT ON Turns the analog dc current filter on Query CURR FILT Returns the analog dc current filter setting 0 OFF and 1 ON 48 Digital Multimeter Supported SCPI Commands SENSe CURRent DC FILTer DIGital STATe lt n gt Description Activates or deactivates the digital averaging filter to improve noise immunity for de current functions This setting is stored in volatile memory Parameters lt n gt OFFor0 ON or 1 Examples CURR FILT DIG ON Query CURR FILT DIG Turns the digital averaging filter off Turns the digital averaging filter on Turns the digital averaging filter on Returns the digital averaging filter setting 0 OFF and 1 ON SENSe RESistance DC FILTer STATe lt n gt Description Activates or deactivates the 3 pole analog filter to improve noise immunity for the 2 wire resistance function This setting is stored in volatile memory Parameters lt n gt OFFor0 ON or 1 Examples RES FILT ON Query RES FILT Turns the analog 2 wire resistance filter off Turns the analog 2 wire resistance filter on Turns the analog 2 wire resistance filter on Returns the analog 2 wire resistance filter setting 0 OFF and 1 ON SENSe RESistance DC FIL Ter DIGital STATe lt n
28. format 1 or a space measurement units a comma and space format 2 Example 1 2345E 0 6 7890E 3 lt CR gt lt LF gt If the secondary display is not on MEAS is equivalent to MEAS1 Note If MEAS is used in external trigger TRIGGER 2 through TRIGGER 5 unexpected results will be obtained VAL1 Meter returns the value shown on the primary display If the primary display is blank the next triggered measurement is returned VAL2 Meter returns the value shown on the secondary display If the secondary display is blank the next triggered measurement is returned If the secondary display is off an execution error is generated VAL If both displays are on the Meter returns the value shown on both displays These values are separated by a comma Example 1 2345E 0 6 7890E 3 lt CR gt lt LF gt If the secondary display is not on VAL is equivalent to VAL1 If a display is blank the next triggered measurement on that display or displays is returned 73 8845A 8846A Programmers Manual Compare Commands and Queries The commands in Table 25 cause the Meter to determine whether a measurement is higher than lower than or within a specified range Table 25 Compare Commands and Queries Command Description COMP Meter enters compare COMP function COMP Meter returns HI if the last COMP measurement reading was above the compare range LO if it was below it PASS if within compare range or if a
29. frame contains a request for the host with the unknown IP address to return a frame to the ARP requester This response frame contains the Ethernet address of the sourcing host and this information is 109 8845A 8846A Programmers Manual then added to the address correspondence table All communication with a host can then be done with information from the table The operation of ARP also initializes the routing tables in bridges routers and gateway devices on the network These tables are used to determine the segment of the network to which a frame should be sent TCP IP Protocol Stack 110 A protocol stack is a group of interacting programs that implement the various functions of the network communication protocol They are usually arranged in a hierarchy of low to higher level functions so the collection is called a stack Windows NT and later versions of Windows supply a TCP IP protocol stack Novell sells an optional package for NetWare that includes a TCP IP stack TCP IP protocol packages with included WINSOCK DLLs can also be purchased from a variety of third party sources The Transmission Control Protocol Internet Protocol TCP IP has evolved as a networking protocol that supports communication among diverse computers and devices at UC Berkeley there once was a TCP IP connected Coke machine The TCP IP protocol can be used to communicate between programs running on many different computer systems running under many
30. front panel a LAN server is initiated in the Meter which listens for client connections on the socket port at the specified IP address To establish a LAN connection to the Meter from a computer using either UNIX LINUX or MS DOS command prompts perform the following procedure 1 On the Meter s front panel change the remote interface port to LAN 2 At the command prompt on the client computer enter telnet lt IP Address gt lt Socket Port gt Alternatively if you are using DHCP and would like to connect using the host name rather than the IP address from the computer command prompt enter telnet lt Domain Name gt lt Socket Port gt As an example if you know the IP address is 129 196 136 131 and the Socket Port is set to 3490 enter the following at a command prompt from any client computer telnet 129 196 136 131 3490 If you are using DHCP and the host name is test1 and the fully qualified domain name is test1 na flukecorp com and the Socket Port is set to 3490 enter the following at the computer command prompt telnet testl na flukecorp com 3490 Once the internal LAN server connects with the client computer the LAN server will reject any other connection attempts by other computers and will tunnel a channel to the connected computer This prevents multiple computers from trying to control the Meter Digital Multimeter Terminating an Ethernet Connection Terminating an Ethernet Connection When you wish to
31. gt Description Activates or deactivates the digital averaging filter to improve noise immunity the 2 wire resistance dc function This setting is stored in volatile memory Parameters lt n gt OFFor0 ON or 1 Examples RES FILT DIG ON Query RES FILT DIG Turns the digital averaging filter off Turns the digital averaging filter on Turns the digital averaging filter on Returns the digital averaging filter setting 0 OFF and 1 ON SENSe FRESistance DC FlLTer STATe lt n gt Description Activates or deactivates the 3 pole analog filter to improve noise immunity for the 4 wire resistance function This setting is stored in volatile memory Parameters lt n gt OFFor0 ON or 1 Examples FRES FILT ON Query FRES FILT Turns the analog 4 wire resistance filter off Turns the analog 4 wire resistance filter on Turns the analog 4 wire resistance filter on Returns the analog 4 wire resistance filter setting 0 OFF and 1 ON 49 8845A 8846A Programmers Manual SENSe FRESistancel DC FILTer DIGital STATe lt n gt Description Activates or deactivates the digital averaging filter to improve noise immunity for the 4 wire resistance function This setting is stored in volatile memory Parameters lt n gt OFFor0 Turns the digital averaging filter off ON or 1 Turns the digital averaging filter on Examples FRES FILT DIG ON Turns the digital averaging filter on Query FRES FILT DIG Ret
32. if an error is generated or if the trigger results in a overrange reading The SRQ mask is set to 33 which is 100001 in binary At power up or on any device clear command the SRQ mask is set to 00 decimal This prevents service requests by holding the RQS bit false under all conditions For other examples of the SRQ mask see the description of the Pl command 93 8845A 8846A Programmers Manual 94 Appendix A Error Codes Introduction While operating the Meter remotely errors may be detected Each error is stored in a buffer that is read in a first in first out FIFO order The error buffer will store up to 16 errors If another error occurs before any of the first 16 are read from the buffer the last error is replaced with 350 Too many errors No further errors are stored until the errors are read from the buffer The error buffer is cleared whenever the Meter s power is removed or a CLS command is executed The RST reset command does NOT clear the error buffer If no errors are in the error buffer when it is read the Meter returns 0 No error Tables 33 through 35 lists the possible error codes and their descriptions Table 33 Execution Error Codes and Descriptions 102 Syntax error Invalid syntax was found in the command string A blank space may have been inserted before or after a colon in the command header or before acomma or a character such as or was used This error will occur when the
33. in volts amps ohms or farads MIN Highest resolution MAX Lowest resolution VOLT RES le 4 Sets the dc volts resolution to 100 uV CURR AC RES le 8 Sets the ac amps resolution to 10 nA VOLT RES Returns the set resolution for dc volts VOLT RES MIN Returns the minimum resolution of the dc volts function SENSe lt function gt NPLCycles lt n gt Description Parameters Examples Query Sets the Meter s integration time for the function specified in lt function gt based on the number of power line cycles This setting is stored in volatile memory This command is only valid for de voltage dc current temperature and resistance 2 wire and 4 wire functions lt n gt _ 0 02 to 100 sets integration time to a preset value of a power line cycle 0 02 0 2 1 10 and 100 MIN 0 02 NPLC MAX 100 NPLC VOLT DC NPLC 2 Sets the de volts integration time to 0 2 ofa power line cycle VOLT NPLC Returns the integration time for dc volts CURR NPLC MIN Returns the minimum integration time for the dc current function SENSe TEMPerature T RANsducer lt subfunction gt RO lt n gt Description Parameters Examples Query Sets the resistance at zero degrees C specified by lt n gt for the RO parameter of the temperature function This setting is stored in volatile memory lt subfunction gt RTD 2 wire RTD FRTD 4 wire RTD lt n gt Oto 1010 Resistance at 0 C TEMP RTD RO 120 Sets the resis
34. its power up configuration RST Resets the Meter IDN lt n gt lt quoted string gt Description Parameters Example 60 Enables or disables the retrieval of a user specified IDN string or factory set IDN string with the IDN command Also sets the user defined IDN string lt n gt ONorl Enables user defined string OFF or 0 Disables user defined string and causes the factory IDN string to be returned for an IDN command lt quoted string gt Up to a 35 character string IDN ON My Meter Sets the IDN string to My Meter and enables the user defined string to be returned when the IDN command is received by the Meter Digital Multimeter Supported SCPI Commands IDN Description Returns the IDN string If IDN is enabled ON then the Meter returns the user defined string If IDN is disabled OFF the the Meter returns the IDN string set at the factory Query IDN Returns up to 35 character string Using Status Reporting Commands SYSTem ERRor Description Retrieves an error from the Meter s error queue Errors are retrieved in first in first out FIFO order Each error may contain up to 80 characters The error queue will store up to 16 errors at which point no additional errors will be stored until errors are removed from the queue Examples SYST ERR Returns the next error in the error queue Performing a SYST ERR command when the error queue is empty causes 0 No error t
35. lt value gt MMFactor MBFactor lt value gt MBFactor MUNits lt name gt MUNits LIMit LOWer lt value gt MINimum MAXimum LOWer UPPer lt value gt MINimum MAXimum UPPer NULL OFFSet lt value gt MINimum MAXimum OFFSet MINimum MAXimum STATe ON OFF STATe Path to the math functions Path to MIN MAX function Retrieves the recorded minimum value Retrieves the recorded maximum value Retrieves the recorded average value Retrieves the number of readings during MIN MAX run Path to DB function Store relative value in relative register Retrieves the relative value from the relative register Path to DBM function Select dBm reference value Retrieves the present dBm reference value Sets the math function Retrieves the present math function Path to math functions Disables enables mx b calculations Sets the value of m for mx b Reads the value of m for mx b Sets the value of b for mx b Reads the value of b for mx b Sets the units name for mx b Reads the units name for mx b Path to limit testing function Set the lower limit for limit testing Retrieves the lower limit Set the upper limit for limit testing Retrieves the upper limit Path to null function Sets the offset value Retrieves set or maximum or minimum offset value Disable enable selected math function Retrieves the state of the math function DATA FEED RDG_ STORE CALCulate FEED
36. range query command may return a range value that is higher or lower by one range For the frequency function the 884XA meters have one range 3 Hz The Fluke 45 has five ranges Ifthe 884XA meters are sent a range set command they will respond to a range query with the set range value Ifthe frequency function is in autorange however the 884XA meters will respond with the value of zero The Fluke 45 allows range selection in CONTINUITY and DIODE TEST The 884XA meters have only one range for these functions Therefore whenever aRANGE command is detected in the Fluke 45 emulation mode the 884XA meters will respond with an error 104 Appendix C Network Consideration Introduction This tutorial provides information on commonly used network communication technology and describes how to get started using the Meter It is not necessary to know the details of network communication methods in order to use the Meter effectively The Meter and host computer software use Ethernet wiring and low level protocols TCP IP high level protocols and the UNIX telnet application interface program These are all public domain non proprietary standards with multiple company support Use of these non proprietary protocols and hardware ensures the Meter and software will operate on most installed networks and have the lowest possible cost using off the shelf commercial networking products Read Network Primer later in this Appendix for more informati
37. readings in internal memory using the INITiate command The product of the sample count SAMPle COUNt and the trigger count TRIGger COUNt must not exceed 5 000 readings Command not allowed The multimeter received a READ command while in the local in local mode For RS 232 operation the SYSTem REMote command should always be executed before sending other commands over the interface 99 8845A 8846A Programmers Manual 100 Table 34 Ethernet IEEE 488 Configuration Errors GPIB fatal error A fatal error occured opening the GPIB port GPIB primary address An error occured attempting to set the GPIB primary address 572 GPIB Read An error occurred while attempting to read characters from the GPIB port 585 ESAC GPIB Specified GPIB Interface Board is not System Controller 58 EABo GPIB I O operation aborted timed out 7 fes ETS sce eo T GPIB Roun not aronea ang scene VO operaren Table 35 Calibration Errors CAL Secure Code Case Invalid characters in calibration secure code The secure code must contain only characters 0 9 and A Z No lower case or other special characters are allowed CAL Secure code Invalid secure code CAL Secure code too Secure code too long long Digital Multimeter Introduction Table 35 Calibration Errors cont 706 CAL Invalid step Invalid calibration step number number CAL Reference Cal reference value out of tolerance CAL Not calibrating CAL only works if you
38. terminate the Ethernet connection you may do so one of two ways 1 Change the Meter s remote interface port to something other than LAN 2 Terminate the Telnet session on the client computer If you have established a LAN connection to the Meter using Telnet and change the remote interface port using the Meter s front panel the LAN server in the Meter will automatically terminate the Telnet session on the client computer On the other hand you may wish to terminate the Telnet session on the client computer but maintain the current LAN remote interface port configuration Client Telnet session termination can vary from computer to computer but typically terminating the shell or command window in DOS will terminate the telnet session When the client terminates the Telnet session the LAN server in the Meter will go back into listen mode waiting for a new client to make a LAN connection request Selecting the Programming Language The Meter s remote command set is switchable between 8845A 46A 8842A and Fluke 45 commands The Meter s standard remote command set 8845 A 46A is compatible with Agilent s 34401A SCPI command set Although every effort was made to make the Meter compatible with Fluke 45 commands and 8842A commands there are some commands that are not compatible See Appendix B Fluke 45 Emulation Limitations for details on Fluke 45 commands that are not compatible with this Meter See Appendix D Fluke 8842A Emu
39. the full range of bus capabilities The IEEE 488 1 document describes and codes the standard bus features so that manufacturers may give brief coded descriptions of their own interfaces overall capability The codes that apply to the Meter are given in Table 1 below together with short descriptions These codes conform to IEEE 488 2 requirements Appendix C of the IEEE 488 1 document contains a complete description of each code Table 2 IEEE 488 Compatibility Codes pe repars patcmam Device Trigger Supports group trigger GET Interconnections Instruments fitted with an IEEE 488 interface communicate with each other through a standard set of interconnecting cables as specified in the JEEE 488 1 Standard document The IEEE 488 interface connector is located on the Meter s rear panel 8845A 8846A Programmers Manual Configuring the RS 232 Port The RS 232 Communication Interface allows ASCI asynchronous serial communication between the Meter and a host or terminal The following sections describe the process of configuring the RS 232 port To make the RS 232 port the active port for remote operation see the Selecting the Remote Interface Port section above Table 3 lists the RS 232 parameter settings when the Meter leaves the factory Table 3 Factory Settings of RS 232 Communications Parameters To access the RS 232 setup menu 1 Press sear 2 Press the FORT 3 Pressthe F amp IF soft key
40. trigger lt type gt set by the TRIGGER command 74 Digital Multimeter FLUKE 45 Command Emulation Summary Miscellaneous Commands and Queries Miscellaneous commands and queries are summarized in Table 27 Table 27 Miscellaneous Commands and Queries Command Description AC CNTRL C The RS 232 equivalent of IEEE 488 DCL Causes lt CR gt lt LF gt and gt lt CR gt lt LF gt to be output SERIAL Meter returns its serial number RS 232 Remote Local Configurations The commands in Table 28 are used with the RS 232 interface to set up the Remote Local configuration of the Meter These commands are valid only when the RS 232 interface is enabled Table 28 RS 232 Remote Local Configuration Commands Command Description REMS Puts the Meter into remote state where all front panel keys except the local key are disabled LOCAL is shown above the first soft key in the display RWLS Puts the Meter in the remote state with front panel lockout LOCKED is shown in the display When in RWLS all front panel buttons are disabled LOCS Puts the Meter in the local state i e local operating mode without lockout All front panel buttons are enabled LWLS Puts the Meter in the IEEE 488 LWLS state i e local operating mode lockout All front panel buttons are disabled Triggering Output The Meter takes measurements when it is triggered to do so The five available trigger types are listed i
41. 127 0 0 0 128 0 0 0 191 255 0 0 192 0 0 0 223 255 255 0 w 224 through 255 with x y and z equal to any value Most IP subnets have Class B or C network IDs because there are quite a few of these available You may be able to get a Class A Net ID but there are so few of these available only 126 world wide that they are rarely issued and most are already assigned Most companies can get one or more Class C blocks which means that there is a limit of 254 hosts per network subnet The TCP IP software separates the network ID portion of the IP address from the host ID portion using the user assigned Subnet Mask This mask looks like an IP address but has a bit set in each bit position of the portion of the IP address that is in the network ID portion For example the subnet mask 255 255 255 0 sets the network ID portion to be the higher order 24 bits of the IP address a class C address Using the subnet mask the TCP IP software is able to detect if a destination address is in the local subnet or if the packet must be sent to another subnet through a Router or Gateway Networks are segmented by use of an active device called a router gateways and hubs sometimes have router capabilities When a host on one subnet wants to send a message to a host on another subnet the Net ID sections of the IP source and destination are different the router is used to deliver the packet to the other network subnet Each Meter is shipped with a defaul
42. 20 2 Press either 3 2320 CONPH TERM ECHO and select either SOMFLITER or TEEHINRL Fluke 45 Mode In the Fluke 45 Command emulation mode there are two modes of RS 232 operation ECHO or Hii ECHO In Echo mode characters sent to the Meter are echoed on the host s display screen In No Echo mode characters sent are not echoed To set the echo parameter refer to the Enabling and Disabling RS 232 Echo section earlier in this manual If you send a character to the Meter over the RS 232 interface pressing the lt DELETE gt or lt BACKSPACE gt key deletes the previous character A backspace is echoed to the display screen if Echo On mode is set In either mode when the host sends a command to the Meter over the RS 232 interface the Meter parses and executes the command and returns a response if appropriate and sends one of three prompts Digital Multimeter Configuring the RS 232 Port gt No errors were detected and the command was successfully parsed and executed gt A Command Error was detected The command was not executed because it was not understood For instance this prompt would be returned if the Meter was sent an input string that contained a syntax error gt An Execution Error was detected The command was understood but not executed 1 e a device dependent error For instance this prompt would be returned if you attempted to use the decibels modifier dB on a frequency measurement FREQ Not
43. 6A Programmers Manual Network Primer In the early days of computer networking vendors used many proprietary communication schemes These forced users to purchase equipment and software from one or a few companies As networking became more popular users placed pressure on vendors to establish standards to allow interoperation of various types of computers operating system software and interface hardware One of these standardization efforts was started by the DARPA agency of the U S Defense department Another was headed up by the DEC and Xerox companies This effort resulted in the Ethernet wiring and low level protocol scheme The DARPA effort resulted in the TCP IP high level protocols Ethernet became an international standard by the efforts of the IEEE 802 3 committee TCP IP is the protocol used on the international Internet network and is supported by consensus of the users of that network many thousands of hosts The sockets API was developed at UC Berkeley and was widely adopted by the UNIX community to support direct host to host communication within a TCP IP network WINSOCK is an MS Windows Dynamic Link Library DLL version of the original UNIX Sockets library and has been standardized by a large number of PC Software and Hardware Vendors WINSOCK has been included with Windows since the introduction of Windows 95 and Windows NT 4 0 To reduce the complexity ofnetwork schemes and to encourage interoperation between varie
44. 845A or 8846A command set selected TEEI HAL and COMPUTER The terminal mode is an interactive mode where an operator inputs commands with immediate returns for requested information queries and interface messages In terminal mode characters sent to the Meter are echoed on the host s display screen and a command prompt for example 3 gt is returned after the CR LF is entered by the terminal If you send a character to the Meter over the RS 232 interface pressing the lt DELETE gt or lt BACKSPACE gt key deletes the previous character A backspace is echoed to the host terminal Note C CNTRL C is the RS 232 equivalent of IEEE 488 DCI device clear causing 1 gt followed by a carriage return and line feed to be output The computer mode is used when the Meter is operated by computer program In this mode requested information is returned by query and interface messages are queued and returned by command Characters are not echoed on the host computer and command prompts are suppressed The lt DELETE gt or lt BACKSPACE gt keys are ignored Selecting Between Computer and Terminal Mode Although you can select between Computer and Terminal mode at any time the selection is only used or changed when the Meter s command mode is set to 8845A 46A To select computer or terminal mode from the front panel 1 Press and then FORT IF Note If the RS 232 port is not already highlighted press SELECT FORT and then ES 22
45. CONTROL 2 Press the soft key under the desired flow control E No flow control k Software flow control Xon hex 11 and Xoff hex 13 ETS Hardware flow control RTS CTS Setting RS 232 End Of Line Character To set the End Of Line EOL character 1 With the RS 232 set up menu displayed press E L 2 Press the soft key labeled with the desired End Of Line character s DR Carriage return only L F Line Feed only CE LF Carriage Return and Line Feed Note Setting the EOL character s in RS 232 also sets the same EOL character s for Ethernet operation Enabling and Disabling Fluke 45 Emulation Echo Although you can turn echo on or off at anytime the selection is only used or changed when the Meter s command mode is set to Fluke 45 emulation To enable or disable Echo for the RS 232 port 1 With the RS 232 set up menu displayed press COMPA TERM ECHO 2 Press either the ECHO or HO ECHO soft key 8845A 8846A Programmers Manual RS 232 Modes of Operation RS 232 communication is slightly different between the 8845A 46A and the Fluke 45 emulation modes Switching between these two command languages is covered in the Selecting the Programming Language section later in this manual The following sections explain the differences in communications protocol and how to set the Meter and computer parameters for proper operation 8845A 8846A Mode There are two modes of RS 232 operation when the Meter has the 8
46. D1 command blanks the numeric field in the 8842A display A DI command in 8842A emulation mode will blank the ENTIRE 8845A 8846A display Gn Get Commands The G2 Get Calibration Input Prompt command in 8842A emulation mode is not supported Entering this command will generate an Error 51 The G3 Get User Defined Message command would normally return a user defined message set using the P3 command however the 8842A emulation doesn t support the P3 command Entering a G3 command will cause a response similar to the following FL8842A 1 8 2008 Tn Trigger Mode Commands The 8842A differentiates between front and rear trigger inputs The 8845 A 8846A treats the front and rear trigger inputs as the same The 8842A commands T1 and T2 are treated as the same command in 8842A emulation mode external trigger with auto trigger delay enabled Furthermore the 8842A commands T3 and T4 are treated as the same command in 8842A emulation mode external trigger with auto trigger delay disabled An external trigger T1 T4 will not trigger the unit from the front panel until you take the Meter out of remote operation by pressing the front panel s LOCAL button The front panel is locked out during remote operation After putting the Meter into local operation press the front panel TRIG button to trigger a reading The 8845A 8846A can be externally triggered in remote or local operation through the rear panel external trigger Jack Wn Terminat
47. EE 488 1 1987 IEEE Standard Digital Interface for Programmable Instrumentation and to IEEE 488 2 2004 Codes Formats Protocols and Common Commands IEEE 488 Operating Limitations The following limitations govern the IEEE 488 remote interface e A maximum of 15 instruments may be connected in a single IEEE 488 bus system e The maximum length of IEEE 488 cable used on a single IEEE 488 system must be the lesser of 20 meters or 2 meters times the number of devices in the system Setting the IEEE 488 GPIB Port Address Before the Meter will accept commands through the IEEE 488 remote interface IEEE 488 must first be enabled or selected as the active interface port This can only be done through the Meter s front panel A controller uses an address between 1 and 32 to identify a specific instrument on the bus The Meter is shipped from the factory with the IEEE 488 port address set to 1 To change the IEEE 488 address 1 Press ea 2 PressFORT IF 3 Press IEEE4ESE 4 Use the soft keys to set the address as follows Select the address digit to adjust by pressing either or With the desired digit selected press the soft key labeled to decrement the digit or to increment the digit 5 With the desired address set press ENTER Digital Multimeter Configuring the IEEE 488 Port Capability Commands To conform to the IEEE 488 1 standard specification it is not essential for a device to encompass
48. FLUKE 8845A 8846A Digital Multimeter Programmers Manual September 2006 Rev 2 6 08 2006 2007 2008 Fluke Corporation All rights reserved All product names are trademarks of their respective companies LIMITED WARRANTY AND LIMITATION OF LIABILITY Each Fluke product is warranted to be free from defects in material and workmanship under normal use and service The warranty period is one year and begins on the date of shipment Parts product repairs and services are warranted for 90 days This warranty extends only to the original buyer or end user customer of a Fluke authorized reseller and does not apply to fuses disposable batteries or to any product which in Fluke s opinion has been misused altered neglected contaminated or damaged by accident or abnormal conditions of operation or handling Fluke warrants that software will operate substantially in accordance with its functional specifications for 90 days and that it has been properly recorded on non defective media Fluke does not warrant that software will be error free or operate without interruption Fluke authorized resellers shall extend this warranty on new and unused products to end user customers only but have no authority to extend a greater or different warranty on behalf of Fluke Warranty support is available only if product is purchased through a Fluke authorized sales outlet or Buyer has paid the applicable international price Fluke reserves the right to in
49. Get the correct subnet mask and gateway address from your network administrator The LAN Subnet Mask is a 32 bit number This number is represented as four 3 digit segment numbers on the front panel display The default subnet mask set at the factory is 255 255 254 0 To change the Meter s subnet mask 1 2 3 From the LAN Port setup menu press the HETHASE soft key Use the soft keys to set the subnet mask as follows To select the mask character to adjust press either or With the desired digit selected press the soft key labeled to decrement the digit or to increment the digit Press the EMTEF soft key The new Subnet Mask will not take effect until the Meter has been powered down and back up again using the rear panel power switch Reading the Domain Name The Domain Name is supplied by the DHCP server and cannot be changed To read the domain name 1 2 3 From the LAN Port setup menu press MORE Press the DOMAIN soft key Press to return to the LAN Port setup menu Configuring the Host Name The Host Name is the host portion of the domain name which is translated into an IP address The Meter s default host name is test1 To change the Host Name 14 Digital Multimeter Configuring the Ethernet LAN Port 1 From the LAN Port setup menu press the HOS TMAME soft key 2 Use the soft keys to set the Host Name as follows To select the character to adjust press either
50. Mode 6 Ensure the Meter s RS 232 port is set to 9600 Baud No parity and Echo Off using the instructions found in the Configuring the RS 232 Port section of Chapter 3 Users Manual 7 Follow the instructions for transferring data from the Meter to the PC found in the online FlukeView Forms Users Manual FLUKE 8842A Emulation Mode The Fluke 8842 A emulation mode is only available through the GPIB interface Whenever the 8846A or 8845A has the RS 232 or LAN interface selected 8842 A emulation mode is not selectable through the front panel The 8842A IEEE 488 commands are listed in the following tables These commands are identical except where indicated For operational differences and commands that are not supported in the 8845A or 8846A refer to Appendix D Example Notes In the examples in this manual device dependent commands are shown enclosed within quotation marks as they would be entered in Fluke BASIC For clarity the commands are also separated by spaces However the spaces are are not necessary and may be omitted Example Explanation F3 R1 S1 T2 This example is equivalent to F3R181T2 or F3 R1 S1 T2 Using the Fluke 1722A Instrument Controller these commands might be written into a BASIC program as shown in Figure 5 Examples using other controllers are given at the end of this section Here is a typical command string as it might be sent from a Fluke 1722A Instrument Controller The str
51. NG BUT NOT LIMITED TO ANY IMPLIED WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE FLUKE SHALL NOT BE LIABLE FOR ANY SPECIAL INDIRECT INCIDENTAL OR CONSEQUENTIAL DAMAGES OR LOSSES INCLUDING LOSS OF DATA ARISING FROM ANY CAUSE OR THEORY Since some countries or states do not allow limitation of the term of an implied warranty or exclusion or limitation of incidental or consequential damages the limitations and exclusions of this warranty may not apply to every buyer If any provision of this Warranty is held invalid or unenforceable by a court or other decision maker of competent jurisdiction such holding will not affect the validity or enforceability of any other provision Fluke Corporation Fluke Europe B V P O Box 9090 P O Box 1186 Everett WA 98206 9090 5602 BD Eindhoven U S A The Netherlands 11 99 To register your product online visit http register fluke com Table of Contents Title Page Introduction a min ete een et nee tn Safety Informal Onsiris E e E A A O EENE Sy MDO lS 45e ss ssresssssneesennssnritsesst rdenesreseie EE E tee esse sn tagte tree Local and Remote Operation Computer Interfaces ss Optimizing System Speed for I O Operation Selecting the Remote Interface Port Configuring the IEEE 488 Port uuesssesssennseenneennennennennennnennse nn IEEE 488 Operating Limitations essen Setting the IEEE 488 GPIB Port Address
52. Path to storing readings taken with INITiate command Enables disables storing of INITiate readings Retrieves state of storing INITiate readings Table 12 MEASure Command Summary MEASure SCALar CAPacitance lt range gt MIN MAX DEF lt resolution gt MIN MAX DEF Path to measure control Preset and make capacitance measurement Make a continuity measurement Path to measure current Make a dc current measurement CONTinuity CURRent DC lt range gt MIN MAX DEF I lt resolution gt MIN MAX DEF AC Make an ac current measurement 30 Digital Multimeter Supported SCPI Commands Table 12 MEASure Command Summary cont Command lt range gt MIN MAX DEF lt resolution gt MIN MAX DEF DIODe low current high voltage FREQuency FRESistance Make a diode measurement Make a frequency measurement Make a 4 wire resistance measurement lt range gt MIN MAX DEF lt resolution gt MIN MAX DEF PERiod Make a period measurement lt range gt MIN MAX DEF lt resolution gt MIN MAX DEF RESistance Make a 2 wire measurement lt range gt MIN MAX DEF lt resolution gt MIN MAX DEF TEMPerature FRTD lt RTD Type TEMPerature RTD lt RTD gt Type gt VOLTage AC Make a 4 wire temperature measurement Make a 2 wire temperature measurement Path to voltage measurements Make an ac voltage measurement lt range gt MIN MAX DEF l
53. RE lt enable value gt SRE STB SYSTem ERRor STATus PRESet QUEStionable ENABle lt enable value gt ENABle EVENt Clear status byte summary and all event registers Enable bits in standard event register Retrieve standard event enable register Retrieve standard event register Set Operation Complete bit in standard event register Returns 1 in output buffer after command exec Power on status clear Retrieve power on status clear setting Enable bits in status byte register Retrieve bits in status byte register Retrieve the status byte summary register Path to meter s error queue Retreive meter s error queue Path to meter s status system Clear questionable data enable register Path to questionable data register Enable bits in questionable data enable register Retrieve questionable data register Retrieve questionable data enable register 35 8845A 8846A Programmers Manual Table 16 System Related Command Summary FETCh 1 2 3 Transfer stored readings to output buffer READ Set trigger system to wait for trigger DISPlay OFF ON Turn display off or on TEXT lt quoted string gt Write message to display CLEar Clear message from display TEXT Retreive displayed message DISPlay Retrieve display setting SYSTem Path to system controls BEEPer Issue a single beep STATe OFF ON Disable enable beeper for limit and diode testing STATe Retrieve state of beeper DATE
54. after it is read This prevents previously read data from being read a second time by mistake If you attempt to read the meter s output buffer twice without an intervening query the Meter will not respond to the second read e RULE 2 READ QUERY RESPONSES BEFORE SENDING ANOTHER QUERY COMMAND STRING Output data remains available in the output buffer until read by the host or until the next command string is received by the Meter This means the Meter s output buffer must be read by the host before and not after the next command string is sent to the Meter e RULE 3 THE METER EXECUTES EACH COMMAND COMPLETELY IN THE ORDER RECEIVED BEFORE MOVING ON TO THE NEXT COMMAND If an input string contains a trigger enter the commands in the following order that is from left to right as written 1 Commands if any to configure the Meter 2 The trigger command 3 Commands to read the result of a triggered measurement FETCh or READ for the 884XA and VAL for the Fluke 45 emulation or to reconfigure the instrument if any 4 The terminator Figure 2 gives two examples of a command string for the Meter The first example is a command recognized by the Meter in the 8845A or 8846A command mode The second example is for the Fluke 45 command mode 20 Digital Multimeter How the Meter Processes Input In the following examples lt space gt between commands is for readability only However a lt space gt between a command
55. age DC DC voltage VOLTage DC RATio DC voltage ratio RESistance 2 wire resistance FRESistance 4 wire resistance FREQuency Frequency PERiod Period TEMPerature RTD 2 wire temperature TEMPerature FRTD 4 wire temperature DIODe Diode CONTinuity Continuity NONE Turn off secondary display Examples FUNC VOLT DC Sets the Meter to volts dc FUNCI VOLT DC FUNC2 VOLT AC Dual function command Query FUNCtion 1 2 Query measurement function Note FUNC2 will return the measurement mode selected for the secondary display assuming its been enabled using the FUNC2 command FUNCI or FUNC will return the measurement mode for the primary display Notes 1 Using FUNC without a 1 or 2 will default to 1 for the primary display 2 Valid only when used with FUNC2 3 Valid only when used with FUNC or FUNCI SENSe lt function gt The SENSe subsystem allows configuring the Meter s functions Parameters lt function gt CAPacitance Capacitance CURRent AC AC current CURRent DC DC current VOL Tage AC AC voltage VOL Tage DC DC voltage RESistance 2 wire resistance FRESistance 4 wire resistance FREQuency Frequency 43 8845A 8846A Programmers Manual 44 Notes PERiod Period TEMPerature RTD 2 wire temperature TEMPerature FRTD 4 wire temperature DIODe Diode CONTinuity Continuity NONE Turn off secondary display 1 Valid only when used with FUNC2 SENSe lt function gt RANGe lt n gt Desc
56. ameter sets the diode test current to 0 1 mA When OFF the current is 1 mA When set to ON the high voltage parameter sets the diode test voltage to 10 volts When OFF the voltage is 5 volts To specify a diode test voltage you must also include ON or OFF for the low current parameter 6 The range and resolution are fixed for continuity tests 1 kO range and 5 digits 7 DC measurement voltage divided by dc reference voltage For dc ratio connect the reference HI LO to the HI LO sense terminals of the Meter and the measurement voltage to the HI LO input terminals of the Meter Note the specified measurement range applies to the input terminals only Note For best results in RATIO the two input commons must be shorted at the Meter terminals The analog filter AFLTR should be off Table 18 Preset Conditions for the MEASure and CONFigure Commands mn TE 41 8845A 8846A Programmers Manual Setting Range and Resolution Parameters The MEASure and CONFigure commands incorporate parameters for setting the Meter s function its range and its resolution Placing the input signal s expected amplitude into the range value causes the Meter to select a range appropriate for the supplied signal amplitude Although the frequency and period functions use a single range for all inputs between 3 Hz and 300 kHz it is necessary to specify a range whenever specifing a resolution setting for these functions When specifying resol
57. and lower limits of the function MIN Lowest range of the function MAX Highest range of the function DEF Autorange lt low current gt ONorl Sets diode current to 0 1 mA OFF or 0 Sets diode current to 1 mA lt low voltage gt ON or 1 Sets diode voltage to 5 volts OFF or 0 Sets diode voltage to 10 volts lt resolution gt a number in the same units not in number of digits as the measurement function MIN Smallest value acceptable MAX Largest value acceptable DEF 5 digits Note You must specify a range whenever specifying a resolution parameter 40 Digital Multimeter Supported SCPI Commands Notes 1 For ac measurements resolution is fixed at 6 2 digits The resolution parameter only affects the front panel display 2 For frequency measurements the Meter uses one range for all inputs between 3 Hz and 300 KHz With no input signal applied frequency measurements return zero 3 For period measurements the Meter uses one range for all inputs between 0 33 seconds and 3 3 usec With no input signal applied period measurements return zero 4 The range and resolution are fixed for temperature measurements However placing PT100 385 or PT100 392 into the range field will set the RTD type Placing CUST1 into the range field will cause the Meter to use the values set into the R and Alpha parameters 5 The range and resolution are fixed for diode test 10 Vdc range and 5 digits When set to ON the low current par
58. ata and Error Messages paragraph later in this section To read suffixed data with a controller using BASIC one can read the whole line into a string variable and then convert the numeric part into a numeric variable However it is much easier to read the numeric part directly into a numeric variable and the suffix into a string variable The leading comma of the suffix serves as a convenient delimiter For example a BASIC program statement might be INPUT 1 A BS The suffix status can be read using the G6 command The Meter defaults to YO on power up and any device clear command DCL or SDC unless in talk only mode ZO Self Test Command The ZO command intiates the diagnostic self tests Since the Meter is reset at the end of the self tests the ZO command should be the last command in a given command string The Meter will ignore any subsequent commands in the same command string When the self tests are complete and no errors have occurred the serial poll register will have bit 5 Data Available true and bit 6 Any Error false Device Clear Command 86 The asterisk command is a device dependent message which resets the Meter to the power up default settings and clears all registers and buffers except for the input buffer The remote local status remains unchanged The asterisk command performs the following 1 Implements the default settings Fl RO SO TO DO BO YO WO 2 Clears the error status regist
59. ble 22A This value corresponds to the reference impedance ohms indicated If lt value gt is not a value shown in Table 22A an Execution Error is generated Table 22A Reference Impedance Values Value Ref Impedance Value Ref Impedance 1 2 12 150 2 4 13 250 3 8 14 300 4 16 15 500 5 50 16 600 6 75 17 800 7 93 18 900 8 110 19 1000 9 124 20 1200 10 125 21 8000 11 135 DBREF Meter returns a lt value gt shown in Table 22A This value corresponds to the reference impedance indicated DFILT on off Activates or deactivates the digital averaging filter to reduce noise for dc functions This filter is only available in DCV DCI 2 Wire and 4 Wire resistance The default setting is ON If an attempt is made to enable the filter in a mode not permitted the request is ignored 71 8845A 8846A Programmers Manual 72 Table 22 Function Modifier Commands and Queries cont Command DFILT MOD Description Returns the state of the digital averaging filter Meter returns a numeric value indicating modifiers in use 8 dB 16 dB Power 32 Relative 64 Compare Range and Measurement Rate Commands and Queries The commands in Table 23 relate to ranging and measurement rates 1 e readings second In the autorange mode the Meter automatically selects a range for each reading AUTO Causes meter to return 1 in autorange or 0 if it is not FIXED Ca
60. by IEEE 488 2 standard Non operational in Fluke 45 Dual Display Multimeter Command accepted but has no effect 1 The user defined IDN 8845A 46A command identification response will set the IDN Indentification query response for both 8845A 46A and Fluke 45 modes of operation IDN is an 8845A 46A only command 69 8845A 8846A Programmers Manual Function Commands and Queries The commands in Table 21 lists the measurement function commands for the Fluke 45 See Tables 22A and 22B for ranges and measurement rates Commands under Primary Display and Secondary Display cause functions to be performed using the primary display or secondary display respectively Table 21 Fluke 45 Function Commands and Queries Commands Primary Secondary Display Display AAC AAC2 ADC ADC2 CLR2 CONT DIODE DIODE2 FREQ FREQ2 FUNC1 FUNC2 OHMS OHMS2 VAC VAC2 VDC VDC2 Function AC current DC current Clears measurement from secondary display if one shown Continuity test Available in the primary display only Diode test Frequency Meter returns the function selected for the primary display as command mnemonic EXAMPLE If frequency is selected for the primary display FUNC1 returns FREQ Meter returns the function selected for the secondary display as command mnemonic If the secondary display is not in use an Execution Error is generated EXAMPLE If frequency is selected f
61. ckets to more than one protocol stack For example it is quite common to have the Novell IPX SPX protocol stack and the TCP IP protocol stack operating over the same ODI multi protocol driver 111 8845A 8846A Programmers Manual 112 Appendix D Fluke 8842A Emulation Limitations Introduction Due to differences in their design the 8845 A and 8846A collectively the 884XA cannot emulate all the functions and features of the Fluke 8842A Some functions are compatible but are not implemented the same in the 884XA meters This appendix covers the differences with the 8842A and gives a list of command s that are not compatible and information on those functions that the 884XA will respond differently to Device Dependent Command Set Table 39 lists Fluke 8842A commands that are not supported in the 8842A emulation mode and the IEEE 488 response received with they are used Table 39 8842A Device Dependent Commands Not Supported Enable EOI Only Command is ignored Disable All Output Terminators Command is ignored pe francais erstem ET SCT Table 40 Fluke 8845A 8846A Commands the Fluke 8842A Doesn t Support Calibration Commands The 8845A 8846A does not support instrument calibration in 8842A emulation mode If you wish to calibrate the instrument you must be in 884XA command mode Any Cn calibration command will generate an Error 51 113 8845A 8846A Programmers Manual 114 Dn Display Commands An 8842A
62. command copies the error status register into the output buffer in the format shown in Figure 7 The first two digits are always 1 and 0 The second two digits represent the appropriate error code if an error has occurred Error codes are listed in Appendix A If an error has not occurred the second two digits are 00 An example output string follows Example Explanation 1071 CR LF 1 Leading 1 0 Leading 0 71 Syntax error in device dependent command string The G7 command gives the error status as it exists when the command is executed at its position in the input string The G7 command does not clear the error status register For more information about error messages see the Output Data section later in the section G8 Get Instrument Identification The G8 command copies the Meter instrument identification into the output buffer in the format shown in Figure 7 The identification is represented by four comma separated fields that are interpreted in Table 30 The first field indicates the manufacturer the second indicates the instrument model number the third is always the serial number and the fourth indicates the version number of the IEEE 488 interface software Example Explanation FLUKE 8842A 1234567 V5 0 CR LF This Meter is a Fluke 8842A with IEEE 488 interface software version 5 0 83 8845A 8846A Programmers Manual N Numeric Entry Command Format Explanation N lt numberic entry gt Where lt numeric entry g
63. command followed by the READ Command MEASure SCALar lt function gt lt range gt or lt RTD type gt or lt low current gt lt resolution gt or lt high voltage gt Description Sets the Meter function with the preset parameters See Table 18 and makes the measurement using the specified range and resolution The reading is placed in the output buffer For the temperature function the range variable is replaced by the RTD type variable Note The dc portion of the function keyword is optional as is the VOLTage portion For instance MEAS AC will be interpreted by the Meter as meaning Volts ac function Parameters lt function gt CAPacitance Capacitance CURRent AC AC current CURRent DC DC current VOLTage AC AC voltage VOLTage DC DC voltage VOLTage DC RATio DC voltage ratio RESistance 2 wire resistance FRESistance 4 wire resistance FREquency Frequency PERiod Period 4 TEMPerature RTD 2 wire temperature 4 TEMPerature FRTD 4 wire temperature DIODe Diodel CONTinuity Continuity lt range gt a number between the upper and lower limits of the function MIN Lowest range of the function MAX Highest range of the function DEF Autorange lt low current gt ON or 1 Sets diode current to 0 1 mA OFF or 0 Sets diode current to 1 mA lt high voltage gt ONorl Sets diode voltage to 10 V OFF or 0 Sets diode voltage to 5 V lt resolution gt a number in the same units not in number of digits as
64. commands Detailed information on the SCPI command set and how the Meter processes those commands is included in this manual Fluke 45 command limitations are covered in Appendix B and Fluke 8842A command limitations are covered in Appendix D in this manual Note For more information regarding the SCPI programming language visit http www scpiconsortium org A free copy of the SCPI standard can be found at http www scpiconsortium org SCPI 99 pdf The level of detail in this chapter is based on the assumption that the reader is familiar with the basics of data communication interface and the IEEE 488 bus Safety Information This section addresses safety considerations and describes symbols that may appear on the Meter or in the manual A AA Warning statement identifies conditions or practices that could result in injury or death 8845A 8846A Programmers Manual A Caution statement identifies conditions or practices that could result in damage to the Meter or equipment to which it is connected AA Warning To avoid electric shock personal injury or death carefully read the information under Safety Information before attempting to install use or service the Meter Symbols Table 1 is a list of safety and electrical symbols that appear on the Meter or in this manual Table 1 Safety and Electrical Symbols A Risk of danger Important 2 Display ON OFF information See manual Hazardous voltage Voltage
65. curred The Standard Event Status Enable Register ESE is a mask register that allows the host to enable or disable mask each bit in the ESR When a bit in the ESE is 1 the corresponding bit in the ESR is enabled When any enabled bit in the ESR changes from O to 1 the Standard Event bit in the Status Byte Register also goes to 1 When the ESR is read using the ESR command or cleared using the CLS command the Standard Event bit in the Status Byte Register returns to 0 24 Digital Multimeter Service Requests IEEE 488 Only and Status Registers Table 5 Description of Bits in ESR and ESE Operation Complete OPC All commands previous to receipt of an OPC command have been executed Interface is ready to accept another message Not used Always set to zero Query Error QYE Attempt has been made to read data from the Meter s output buffer when no output is present or pending Possibly a new command line has been received before a previous query has been read or both input and output buffers are full Device Dependent Error DDE Incorrect input during calibration or RS 232 input buffer overflow Execution Error EXE Command was understood but could not be executed Results from for example an inappropriate parameter Command Error CME Command not executed because it was not understood This condition might occur when for example a command sent to the meter contained a syntax error Not used Always set to zer
66. d into the output buffer if an error occurs are formatted as numeric data Numeric Data and Error Messages Numeric data is loaded into the output buffer in response to an instrument trigger The exponent is always a multiple of 3 as in engineering notation Numeric data is of constant length It is 11 characters plus terminators when the suffix is disabled and 16 characters plus terminators when the suffix is enabled The suffix is enabled by the Y1 command and consists of five ASCII characters as shown in Figure 7 The suffix is appended only to numeric data never to status data The terminators are determined by the Terminator commands The default is CR LF EOI There are three types of numeric data measurement data overrange indication and error messages Overrange Indication If a reading is overrange 200 000 counts the measurement data has the following format 9 99999E 9 lt suffix gt lt terminators gt Overvoltage readings gt 1000V dc or 700V ac do not result in this display Error Messages Ifthe Meter detects an error it loads an error message into the output buffer in the following numeric format 1 00xxE 21 lt terminators gt The digits xx represent a two digit error code Error codes are listed in Appendix A The suffix is always suppressed for error messages Example Explanation 1 0071E 21 CR LF ERROR 71 Syntax error in device dependent command string As with local operation non
67. d with An output string is terminated by a Carriage Return and Line Feed lt CR gt lt LF gt for RS 232 or Ethernet applications or a Line Feed with End or Identity lt LF gt lt EOI gt for IEEE 488 After sending the Meter a query command via the RS 232 interface wait for the Meter to return a prompt before sending another query command Although the Meter will accept and process all commands other than a query command a device dependent command error is generated and the second command is discarded if it is a query command If the Meter is part of an IEEE 488 bus system the output data is not actually sent onto the bus until the host addresses the Meter as a talker When the output buffer is loaded the Message Available MAV bit in the Status Byte Register is set true For more information see Status Byte Register Numeric output from the Meter is displayed as shown in the following examples EXAMPLE EXPLANATION 1 2345E 0 Measured value of 1 2345 1 2345E 6 Measured value of 1 2345 x 106 Triggering Input While under remote control the Meter must be placed in a wait for trigger state before a measurement can be triggered The INITiate and READ commands set the Meter in to a wait for trigger state The number of measurements samples and the number of triggers the Meter will accept after being put in a wait for trigger state are variables set using remote commands The defaults for these variables are one sampl
68. ded by header and error detection information used by the protocols The message together with the protocol information is called a packet When physical network information clock synchronization error detection etc is wrapped around the packet it is called a frame The interface hardware adds and strips off the Frame information around the packet as it moves through a network So unless you re doing low level analysis of network traffic you never need to deal with frame information For any protocol the packet consists of a destination address a source address some protocol type information a message length field and error detection information The TCP IP protocol adds additional fields to the packet for message sequence determination and application port ID The sequence number allows multi packet messages to be assembled into the correct order The port ID specifies which application running on a system is sending or receiving the message Support of port IDs allow multi 107 8845A 8846A Programmers Manual tasking within a computer system with messages being sent and received from the individual task In the TCP IP protocol error detection is supported by adding a checksum of the data in the packet to the end of each packet Using this checksum the receiving system can detect a bad packet and request a re transmit using the source address Each host device attached to the network wiring in an Ethernet networ
69. different operating systems and even running on several different physical network types Ethernet being only one of the many types supported The TCP IP protocol stack is isolated from the underlying network hardware by a device driver Applications use TCP IP resources via one of the several Application Programming Interfaces API that are commonly supported by network software vendors You rarely need to know the details of the TCP IP protocol In summary TCP IP enables two computer systems to establish a connection that allows data to be exchanged Data to be transmitted is assembled into manageable chunks packets by the TCP portion of TCP IP TCP also reconstructs the data at the receiving end by merging the chunks back together in the correct order TCP also assures error free communication by use of a checksum within each packet Finally TCP uses the Port ID to specify the specific application within each system that is sending and receiving the data The IP portion of the TCP IP protocol simply addresses sends and receives packets It uses the IP address the subnet mask and the default gateway information The IP address is described in IP Addresses and Segmented Networks in this appendix The subnet mask is used to separate the network ID from the host ID in an IP address For example if the IP address of a Meter was 198 178 246 10 and a class C network ID was active the subnet mask would be 255 255 255 0 When this mask is
70. ds Enable CR LF EOI Default Enable CR LF Only Enable CR EOI Only Enable CR Only Enable LF EOI Only Enable LF Only Clear Commands Device Clear Reset meter to default conditions X0 Clear Error Register Single Trigger Commands Trigger Measurement Get Commands GO Get Instrument Configuration F R S and T G1 Get SRQ Mask G3 Get User Defined G4 Get Calibration Status G5 Get IAB Status Input F R Autorange On Off Offset On Off G6 Get YW Status Suffix Enabled Disabled Terminator Selection G7 Get Error Status G8 Get Instrument Identification Put Commands PO Put Instrument Configuration F R S and T P1 Put SRQ Mask Put Command Format N lt value gt PO N lt value gt P1 SRQ Mask Values 00 for SRQ Disabled Default 01 for SRQ On Overrange 16 for SRQ On Data Available 32 for SRQ On Any Error Note Add SRQ mask values for connections Example 33 for SRQ on overrange or any error Self Test Command ZO Begin Self Test Terminators CR Carriage Return Execute LF Line Feed Execute EOI End Or Identify Execute GET Group Execute Trigger Trigger and Execute Note GET is an interface message caw66 eps Figure 6 8842A Emulation Device Dependent Command Set Digital Multimeter FLUKE 8842A Emulation Mode Device Dependent Command Set Device dependent commands are the heart of 8842A emulation remote control They tell the Meter how and when to make measurements when t
71. e C CNTRL C is the RS 232 equivalent of IEEE 488 DCI device clear causing gt followed by a carriage return and line feed to be output Terminations for the end of line can be set to carriage return CR line feed LF or both CRLF Terminations for the end of line can be set in the lt Instr SETUP gt lt PORT IF gt lt RS232C gt selection To change the Meter to Fluke 45 Emulation Mode setup the remote interface for RS 232 or IEEE 488 Fluke 45 mode will not work over Ethernet For RS 232 1 Press 2 PressFORT IF softkey 3 Press the SELECT FORT softkey 4 Press the FE 2220 softkey Set the baud rate to 9600 as follows Press Press the BAHD RATE softkey aA A N e lgs Lu oO n n 5 oO 71 Press the 600 softkey Set the RS 232 port to non echo as follows 1 Press gt as 3 softkey 4 RH ECHO softkey 5 Press the H ECHO softkey For IEEE 488 1 Press 2 Press FORT IF softkey 3 Press the SELECT FORT softkey 4 Press the TEE softkey Set the IEEE 488 address to a system compatible value as follows 8845A 8846A Programmers Manual Press Press FORT IF softkey EES softkey A N Re ao oO a a m T Use the soft keys to set the address as follows Select the address digit to adjust by pressing either or With the desired digit selected press the soft key labeled to decrement the digit or to increment the characte
72. e Disable enable Autoranging Retrieve present autorange setting Retrieve the present range setting Path to capacitance measurement range Set capacitance measurement range Disable enable Autoranging Retrieve present autorange setting Retrieve the present range setting Set resolution for capacitance measurement Retrieve capacitance measurement resolution Path to temperature measurement Path to 2 wire temperature measurement Set RTD alpha parameter 33 8845A 8846A Programmers Manual Table 13 Measurement Configuration Command Summary cont ALPHa NPLCycles 0 02 0 2 1 10 100 MINimum MAXimum NPLCycles MINimum MAXimum RO lt RO value gt RO TYPe PT100_385 PT100_392 CUST1 TYPe FRTD ALPHa lt alpha value gt ALPHa NPLCycles 0 02 0 2 1 10 100 MINimum MAXimum NPLCycles MINimum MAXimum RO lt RO value gt RO TYPe PT100_385 PT100_392 CUST1 TYPe FILTer DC STATe OFF ON STATe DIGital STATe OFF ON STATe DETector BANDwidth 3 20 200 MINimum MAXimum BANDwidth MINimum MAXimum ZERO AUTO OFF ONCE ON AUTO INPut IMPedance AUTO OFF ON AUTO ROUTe TERMinals 1 Default parameters are shown in bold Retrieve the present RTD alpha parameter Set integration time for selected function Retrieve integration time for selected function Set resistance at 0 C Retrieve present 0 C resistance setting Set the type of RTD Re
73. e of the errors are latching except for ERROR 31 If the mA DC or mA AC function is requested while the FRONT REAR switch is in the REAR 90 Digital Multimeter FLUKE 8842A Emulation Mode position ERROR 31 will persist until the switch is set to FRONT or another function is selected To check for an error condition test whether the output buffer data is greater than or equal to 1E 21 or test the Any Error bit bit 6 in the serial poll register Status Data Status data is the output in response to G0 G1 G3 G4 G5 G6 G7 and G8 commands The data is formatted as shown in Figure 7 and is interpreted in Table 30 Examples of status data can be found in the description of the Get commands The SRQ mask loaded by the G1 command consists of two integers plus terminators All other status data is always a four digit integer plus terminators The terminators LF Line Feed and CR Carriage Return each add an extra character when enabled The Meter begins some status data with a leading ASCII one 1 or a one and a zero 10 This prevents the controller from suppressing any leading zeros present in the output string of the Meter It also gives a uniform four character length to all instrument configuration data Status data from the Get commands reflects the status of the Meter at the time the command is executed at its place in the input command string Output Priority Since only one output string is allowed per input command str
74. e per trigger and one trigger per wait for trigger state See the Trigger and Sample remote commands to set these values All available trigger methods fall into two basic categories e Internal triggering uses the Meter s internal trigger circuit for a continuous source of triggers e External triggering comes from a source outside the Meter controlled by the user Internal Triggering When the Meter s trigger source is set to immediate measurements are triggered by the Meter s internal trigger circuit As an example with the sample count set to 5 and the trigger count set to 2 the Meter will collect 10 measurements after it receives an INITiate or READ command and then stop taking measurements The READ command will return all 10 readings immediately while the INITiate command must be followed by a FETCh command to retrieve the measurements 22 Digital Multimeter Service Requests IEEE 488 Only and Status Registers External Triggering There are three methods of triggering the Meter externally e A trigger signal applied to the external trigger jack on the Meter s rear panel When the Meter s trigger source is set to external and the Meter is in a wait for trigger state a negative going signal on the external trigger jack will trigger a measurement cycle e JEEE 488 1 GET command IEEE 488 Interface only e TRG command When the Meter s trigger source is set to BUS and the Meter is in a wait for trigger
75. e string length was more than 12 characters This error can be generated by the CALibration STRing and DISPlay TEXT commands 227 Invalid function Decibels modifier was applied to an selected function that does not support decibels Digital Multimeter Introduction Table 33 Execution Error Codes and Descriptions cont 230 Data stale A FETCh command was received but internal reading memory was empty The reading retrieved may be invalid Date timeout Timed out while taking data Second function invalid Secondary function is not enabled Can t save MAC Could not save MAC address 319 Can t save LAN Could not save network configuration configuration 320 Can t save non volatile Could not save non volatile configuration configuration Self test failed The Meter s complete self test failed from the remote interface TST command In addition to this error more specific self test errors are also reported 350 Too many errors The error queue is full because more than 16 errors have occurred No additional errors are stored until you remove errors from the queue The error queue is cleared when power has been off or after a CLS clear status command has been executed 410 Query interrupted A command was received which sends data to the output buffer but the output buffer contained data from a previous command the previous data is not overwritten The output buffer is cleared when power has been off or after a
76. ed in volatile memory Parameters lt n gt 0 to 50 000 Number of triggers before Meter becomes idle MINimum Number of triggers is set to 1 MAXimum Number of triggers is set to 50 000 INFinite Continuously accepts triggers A device clear is required to set the Meter to idle state after INFinite has been set Examples TRIG COUN 430 Number of triggers set to 430 Query TRIG COUN Retrieves the number of triggers presently set in the Meter Returns 9 90000000E 37 if trigger count has been set to INFinite TRIG COUN MIN Returns 1 to indicate the minimum number of triggers the Meter will accept per trigger TRIG COUN MAX Returns 50 000 to indicate the maximum number of triggers the Meter will accept per trigger Using System Related Commands FETCh 1 2 Description Example FETCh3 Description Examples 58 Moves measurements stored in the Meter s internal memory to the output buffer FETCh1 or FETCh returns measurements from the primary display FETCh2 Returns readings from the secondary display FETCh2 Retrieves a single measurement from the Meter s internal memory that was taken by the secondary display if the secondary measurements are enabled Retrieves the last measurement from the Meter s primary display Unlike the FETCh or FETCh1 commands which require that the meter be first placed in the wait for trigger state using the INIT command to trigger a measurement or multiple measurements from t
77. eeneeeeeeseeeseeeesneeaes Sending Numeric Values to the Meter uesessnssennsennnennnennennennn en Sending Command Strings to the Meter How the Meter Processes Output Triggering Tnp t riiintean E RR RE Internal Triggering iieiaei a Ea EE EE EEEE EE a External Trigperme css ai Service Requests IEEE 488 Only and Status Registers neeen Standard Event Status and Standard Event Status Enable Registers Questionable Data Event Register and Questionable Data Enable Register Status Byte Register ee in halle Reading the Status Byte Register ussensensennneenneennnennen nennen Service Request Enable Register Supported SCPI Commands ss SCPI Command Summary seen SCPI Command Details sing the MEASure Command sing the CONFigure Command sing the READ Command ss sing the INITiate Command 404sseenseesnnnnenennnnnnenene nenne sing the FETCh Command ss sing the SENSe Subsystem to Configure the Meter ogramming for Math Operations ogramming the Trigger System nennen een sing System Related Commands sing Status Reporting Commands alibration Commands un een suis sing RS 232 Ethernet Interface Commands neenneenennenen mimand Terminators u nansksiiennsiknikikksiiestesisnailiineni Alternate Programming Language C
78. enabled to write to the dBm reference impedance register This setting is stored in volatile memory Parameters lt value gt 2 4 6 16 50 75 90 93 100 110 124 125 135 150 250 300 500 600 default 800 900 1000 1200 or 8000 Q MINimum Sets dBm reference impedance register to 50 Q MAXimum Sets dBm reference impedance register to 8000 Q Examples CALC DBM REF 110 Sets dBm reference impedance register to 110 Q Query CALC DBM REF Retrieves the present dBm reference impedance register value CALC DBM REF MIN Returns 50 CALC DBM REF MAX Returns 8000 53 8845A 8846A Programmers Manual 54 CALCulate LIMit LOWer lt value gt MINimum MAXimum Description Parameters Examples Query Sets the lower limit value used for limit testing This setting is stored in volatile memory lt value gt 0 to 120 of highest range MINimum Sets lower limit register to 120 of highest range of selected function MAXimum Sets lower limit register to 120 of highest range of selected function CALC LIM LOW 235 Sets lower limit register to 235 CALC LIM LOW Retrieves the lower limit register value CALC LIM LOW MIN Returns 120 of highest range of selected function CALC LIM LOW MAX Returns 120 of highest range of selected function CALCulate LIMit UPPer lt value gt MINimum MAXimum Description Parameters Examples Query Sets the upper limit value used for limit testing This se
79. ent measurement Retrieve dc current measurement resolution Path to 2 wire resistance measurement range Path to analog filter Set the analog filter off or on Retrieve the present analog filter setting Path to digital filter Activates or deactivates digital filter Retrieve the present digital filter setting Digital Multimeter Supported SCPI Commands Table 13 Measurement Configuration Command Summary cont NPLCycles 0 02 0 2 1 10 100 MINimum MAXimum NPLCycles MINimum MAXimum RANGe lt range gt MINimum MAXimum AUTO OFF ON AUTO RANGe MINimum MAXimum RESolution lt resolution gt MINimum MAXimum RESolution MINimum MAXimum FRESistance FILTer STATe OFF ON STATe DIGItal STATe OFF ON STATe NPLCycles 0 02 0 2 1 10 100 MINimum MAXimum NPLCycles MINimum MAXimum RANGe lt range gt MINimum MAXimum AUTO OFF ON AUTO RANGe MINimum MAXimum RESolution lt resolution gt MINimum MAXimum RESolution MINimum MAXimum FREQuency APERture 0 01 0 1 1 MINimum MAXimum APERture MINimum MAXimum VOLTage RANGe lt range gt MINimum MAXimum AUTO OFF ON AUTO RANGe MINimum MAXimum PERiod APERture 0 01 0 1 1 MINimum MAXimum APERture MINimum MAXimum VOLTage RANGe lt range gt MINimum MAXimum AUTO OFF ON AUTO RANGe MINimum MAXimum CAPacitance RANGe lt range gt MINimum MAXimum AUTO OFF ON AUTO RANGe MINimum MAXim
80. er equivalent to X0 Digital Multimeter FLUKE 8842A Emulation Mode 3 Zeros the SRQ mask prohibiting service requests equivalent to NO P1 4 Zeros the numeric entry register equivalent to NO 5 Zeros the serial poll register 6 Sets the SRQ line false The asterisk command is executed in its proper turn in a string just like any other command without affecting the contents of the input buffer All commands which precede the asterisk command are performed The asterisk command is useful to ensure that the Meter is initialized to the same state each time a program is run By contrast the similar interface messages DCL Device Clear and SDC Selected Device Clear cause the entire input buffer to be cleared immediately DCL SDC and the asterisk command are all considered to be device clear commands because the results are so similar however DCL and SDC are not identical to the asterisk command described here Single Trigger Command The Single Trigger command causes the Meter to take a reading and place the result into the output buffer To accept this command the Meter must be in external trigger mode selected by the T1 T2 T3 or T4 command The Single Trigger command is one of five ways to trigger a reading Of these only the Single Trigger command and the Group Execute Trigger command GET are loaded into the input buffer Input Syntax The following paragraphs describe how to construct groups
81. er in different subnets e A Gateway is used to connect two networks with different architecture and protocols For example a Gateway could be used to connect an Ethernet to an X 25 net running on public telephone wiring Gateways also perform router bridge and repeater functions The operation ofthe Meter and its software should be unaffected by a properly designed network using any ofthese network devices However you must use extra care when setting up host PCs and the Meter in a network containing multiple subnets net containing one or more routers and or gateways The IP addresses assigned to the host PC and instruments must be carefully selected in this case See IP Addresses and Segmented Networks for more information on IP address assignment When a bridge router or gateway is used in a network containing the Meter and hosts be sure to reboot the host PC whenever an instrument is moved from one segment of the network to another This is required to allow the network hardware devices to initialize bridging and routing tables Also when an 8845 A 8846A Series instrument is used in a different subnet from the host PC the routers and gateways used to connect the subnets must be able to route IP packets across the segments The default gateway addresses on the the Meter and host PC must be set properly as well Basic Network Packet and Frame Contents Network messages consist of short mostly less than 1 KB chunks of data surroun
82. er is in regardless of whether the Meter is in autorange or manual range The output string from a GO command is acceptable as an argument for an N command This allows you to configure the Meter from the front panel and then record the configuration over the bus for future use with a PO command G1 Get SRQ Mask The G1 command copies the present SRQ mask into the output buffer in the format shown in Figure 7 The SRQ mask values are explained in Table 30 An example output string follows For more information about the SRQ mask see the Status Data section later in this section Example Explanation 33 CR LF Enable SRQ on any error or overrange G3 Get User Defined Message The G3 command loads the output buffer with the indentification string and calibration date of the Meter Example Explanation FL8842A 10 8 2008 CR LF Identifies Meter and gives calibration date G4 Get Calibration Status The command loads the output buffer with the instrument s calibration status in the format shown in Figure 7 The status is represented by a four digit integer which is interpreted in Table 30 The first two digits are always 1 and 0 The third digit indicates whether or not the calibration verification mode is enabled The fourth digit indicates whether or not the calibration mode is enabled Since the Meter can only be calibrated in 8845 A 8846A mode the response to the G4 command in the 8842A emulation mode will always be 1000
83. erial poll which clears RQS Not Used Always set to zero As read by STB command If the Status Byte Register is read by a serial poll bit 6 is returned as RQS Service Request Enable Register The SRE Register is an 8 bit register that enables or disables i e masks corresponding summary messages in the Status Byte Register The Meter may be programmed to make a service request on errors questionable data or when output is available Conditions that trigger a service request are specified by writing a binary weighted value to the SRE Register using the SRE command EXAMPLE EXPLANATION SRE 16 Enables the generation of an SRQ when bit 4 Measurement Available in the Status Byte Register is set to 1 16 is the decimal equivalent of 00010000 binary This means that bit 4 in SRE Register that corresponds to the Measurement Available bit in the Status Byte Register is 1 and all other bits are 0 EXAMPLE EXPLANATION SRE 48 Enables the generation of an SRQ when bits 4 or 5 Measurement Available or Standard Event in the Status Byte Register are set to 1 The binary equivalent of 48 is 00110000 indicating that bits 4 and 5 are set to 1 27 8845A 8846A Programmers Manual If any bit in the SRE is set to 1 the RQS bit bit 6 in the Status Byte Register is enabled meaning a service request can be generated when the appropriate bits in STB become 1 Use the SRE query see Table 10 to read the SRE Register The
84. ery VOLT IMP AUTO Returns the state of the input impedance mode 0 OFF and 1 ON 50 Digital Multimeter Supported SCPI Commands INPut IMPedance AUTO lt n gt Description Activates or deactivates default the automatic input impedance mode for dc voltage measurements With AUTO OFF the input impedance is fixed at 10 MQ for all ranges With AUTO ON the input impedance is set to gt 10 GQ for the 100 mV 1 V and 10 V ranges This setting is stored in volatile memory Parameters lt n gt OFFor0 Turns off automatic input impedance ON or 1 Turns on automatic input impedance Examples IMP AUTO ON Turns on automatic input impedance Query IMP AUTO Returns the state of the input impedance mode 0 OFF and 1 ON ROUTe TERMinals Description A query that returns the state of the front or rear panel input terminals switch Examples ROUT TERM Returns FRON or REAR Programming for Math Operations Of the five possible Meter math functions only one can be enabled at a time Once a math function is selected it stays selected until the Meter is powered down or another math function is set A reset command received through the remote interface will also disable the math function Presetting some math registers are possible Table 19 is a matrix indicating which math functions work with each Meter function Selecting a math function that is not allowed with a Meter function causes math to be disabled Selec
85. establish a connection to the meter you should connect using the IP address 129 196 17 23 Attempting to establish a connection to 129 196 017 023 may result in a connection request to 129 196 15 19 Setting the IP Address An internet IP address is required for all internet and TCP IP communications If DHCP is enabled the Meter will use the dynamic address supplied by the DHCP server However if the DHCP server fails to supply the address or DHCP is disabled the currently configured static IP address will be used Selecting Dynamic Host Configuration Protocol DHCP Dynamic Host Configuration Protocol DHCP is a client server protocol that eliminates having to manually set permanent static IP addresses The DHCP server provides configuration parameters dynamic IP address subnet mask and default gateway IP addresses which are required for a client to participate in an IP network Using DHCP is the easiest way to configure the Meter for remote communication through the LAN interface DHCP is enabled when the Meter is shipped from the factory When connected to a network and the LAN port is enabled the Meter will try and retrieve the parameters from a DHCP server necessary for communications If the parameters can t be obtained the Meter switches to the parameters that were manually entered into the Meter To disable or enable DHCP on the Meter Lu From the FORT IF menu press LAM If DHCP is already enabled then HEF will
86. estionable Data Binary Wieghts Event Register Enable Register 20 D 956 Voltage Overload 2 2 512 Current Overload 2 1024 Not Used 2 2048 12 Used 2 4096 2 8192 nn 2 16384 Used 45 ised 2 32768 Used OR Used Ohms Overload Not Used Limit Test Fail LO Limit Test Fail HI Remote Mode ot Used Status Byte Summary Register Enable Register Not Used Not Used Not Used LEE Questionable Data OR STAT QUES EVEN STAT QUES ENAB lt value gt Message Available STAT QUES ENAB Standard Event Request Service gt lt Standard Event Not Used Event Register Enable Register Serial Poll SPOLL SRE lt value gt STB SRE Operation Complete Not Used Query Error Device Error Output Buffer Execution Error Command Error Not Used Power On ESR ESE lt value gt ESE caw01f eps Figure 3 Overview of Status Data Structure 8845A 8846A and Fluke 45 Standard Event Status and Standard Event Status Enable Registers The Standard Event Status Register ESR assigns events to specific bits see Figure 3 and Table 5 When a bit in the ESR is set for example 1 the event that corresponds to that bit has occurred since the register was last read or cleared For example if bit 3 DDE is set to 1 a device dependent error has oc
87. f secondary display Path to configure voltage measurement range Path to ac voltage range Select filter Retrieve present filter setting Set ac voltage range Disable Enable Autoranging Retrieve present autorange setting Retrieve the present range setting Set resolution for ac voltage measurement Retrieve ac voltage measurement resolution Path to dc voltage range 31 8845A 8846A Programmers Manual Table 13 Measurement Configuration Command Summary cont FILTer STATe OFF ON STATe DIGItal STATe OFF ON STATe 1MPedance AUTO OFF ON AUTO NPLCycles 0 02 0 2 1 10 100 MINimum MAXimum NPLCycles MINimum MAXimum RANGe lt range gt MINimum MAXimum AUTO OFF ON AUTO RANGe MINimum MAXimum RESolution lt resolution gt MINimum MAXimum RESolution MINimum MAXimum CURRent AC BANDvwidth 3 20 200 MINimum MAXimum BANDwidth RANGe lt range gt MINimum MAXimum AUTO OFF ON AUTO RANGe MINimum MAXimum RESolution lt resolution gt MINimum MAXimum RESolution MINimum MAXimum DC FILTer STATe OFF ON STATe DIGital STATe OFF ON STATe NPLCycles 0 02 0 2 1 10 100 MINimum MAXimum NPLCycles MINimum MAXimum RANGe lt range gt MINimum MAXimum AUTO OFF ON AUTO RANGe MINimum MAXimum RESolution lt resolution gt MINimum MAXimum RESolution MINimum MAXimum RESistance FILTer STATe OFF ON STATe DIGita
88. function CODE lt new code gt Change security code STATe offlon lt code gt Unsecure secure calibration mode STATe Retrieves state of security mode STRing lt quoted string gt Record calibration information STRing Retrieves calibration information DATE lt date gt Set the calibration date DATE Retrieve the calibration date VALue lt value gt Specify calibration signal value VALue Retrieves calibration signal value STEP lt step gt Reference Set the calibration step and reference STEP Retrieve the calibration step 28 Digital Multimeter Supported SCPI Commands Table 9 CONFigure Command Summary CONFigure SCALar VOLTage DC range resolution RATio AC range resolution CURRent DC range resolution AC range resolution RESistance range resolution FRESistance range resolution FREQuency range resolution PERiod range resolution CAPacitance range resolution TEMPerature FRTD lt RTD Type gt TEMPerature RTD lt RTD Type gt CONTinuity DIODe low current high voltage CONFigure Subsystem to set Meter function Path to set voltage function Selects dc volts function Selects dc volts ratio function Selects ac volts function Path to set current function Selects dc current function Selects ac current function Selects resistance function Selects 4 wire resistance function Select
89. g input command strings They are e RULE 1 Read output data only once To prevent old previously read data from being read a second time by mistake the output buffer is always cleared after it has been read If the output buffer is read twice without an intervening output command the Meter will not respond to the second attempt to read the output buffer However if the Meter is in TO no intervening command is necessary e RULE 2 Use no more than one output command per input command string Because the Meter has only one output buffer it writes new data over old If an input command string contains more than one output command only the data from the last command can be read Example Explanation F1 T3 F2 2 Improper construction The second trigger writes over the first To obtain two readings send two complete command strings separated by terminators F2 R3 S0 T3 2 Correct construction The string contains only one output command F2 R3 S0 Correct construction It is permissible for a string not to contain an output command e RULE 3 Read the output data generated by one input command string before sending the next input command string Digital Multimeter FLUKE 8842A Emulation Mode Output data remains available in the output buffer until it is read or until the next input command string is received As soon as the controller finishes reading the output buffer or as soon as the Meter receives a
90. ged calibration values CALibration SECure CODE lt new code gt Description Sets a new calibration password Before entering a new code you must first enter the old password using the CAL SEC STAT command The Meter has a password of FLUKE884X when shipped from the factory Parameters lt new code gt Up to 12 characters of capital letters and numerials A Z 0 9 Example CAL SEC CODE 12B Sets the new calibration password to 12B The password cannot be recalled but the password can be reset to the factory default without returning the Meter for service AA Warning To avoid electric shock and or injury do not open the Meter unless you are qualified to do so Follow the instructions in the 88454 8846A Service Manual for opening the Meter case Located at the rear of the chassis behind the Ethernet connector J17 there is a jumper connector labeled W2 Short the pins of W2 together and power cycle the Meter to reset the password to FLUKE884X CALibration SECure STATe lt n gt lt code gt Description Secure or unsecure the Meter for calibration This setting is stored in non volatile memory Parameters lt n gt ONorl Secures the Meter from calibration OFF or 0 Unsecures the Meter for calibration lt code gt Up to 12 character string Example CAL SEC STAT OFF 12B Unsecures the Meter for calibration when the password is 12B Query CAL SEC STAT Retrieves the state of the Meter s calibration security 0
91. gister 61 8845A 8846A Programmers Manual 62 STATus PRESet Description Examples CLS Description Examples Sets all bits to zero in the Meter s Questionable Data enable register STAT PRES Sets all bits to zero Sets all bits to zero in the Meter s status byte register and all event registers Also clears the error queue CLS Sets all bits to zero and clear error queue ESE lt enable value gt Description Parameters Examples ESE Description Examples ESR Description Examples OPC Description Examples OPC Description Examples PSC lt n gt Description Parameters Enables or disables bits in the Meter s Standard Event enable register lt n gt Oto 255 Binary weighted decimal value representing the bits to set in the register Although this register has 8 bits and will accept a number from 0 to 255 only bits 0 2 through 5 and 7 are used ESE 160 Sets bits 5 and 7 to one and all other bits to zero Retrieves the value in the Meter s Standard Event enable register ESE Retrieves a binary weighted decimal value representing the bits set in the Standard Event enable register Retrieves the value in the Meter s Standard Event register ESR Retrieves a binary weighted decimal value representing the bits set in the Standard Event register Sets bit 0 Operation complete in the Meter s Standard Event register OPC Sets bit 0 in the
92. gt 30 V Earth ground dc or ac peak might be present acc Alternating Current Teso Capacitance Fuse AC or DC Alternating or Direct Current Eg Digital signal EE ee tone Potentially hazardous voltage CAT II IEC 61010 Overvoltage installation or measurement Category 2 Static awareness Static discharge x Do not dispose of this product as unsorted can damage part s municipal waste Go to Fluke s website for recycle information Local and Remote Operation When the Meter is operated from a host it is said to be operated remotely When operated from the front panel it is said to be operated locally Most operations that can be performed locally can also be performed remotely over the remote interface Some operations like setting communications parameters for the RS 232 interface and addressing the Meter for IEEE 488 operations can only be set through the front panel AA Warning To avoid electric shock turn off the signal source to the Meter before touching the test leads The front panel display may not indicate the true input voltage while in remote mode Always assume lethal voltages exist on the front panel inputs Digital Multimeter Optimizing System Speed for 1 0 Operation Computer Interfaces Both the 8845 A and 8846A Multimeters come equipped with an RS 232 Ethernet and IEEE 488 interface Only one remote interface can be enabled at a time Using any of the interfaces turns the Meter into a f
93. he FETCh command INIT Sets the Meter to the wait for trigger state Sets the Meter in to the wait for trigger state where the next trigger from the selected source triggers a measurement cycle Measurements are sent directly to the output buffer READ Sets the Meter to the wait for trigger state Digital Multimeter Supported SCPI Commands TRIGger SOURce BUS IMMediate EXTernal Description Sets the source from which the Meter will expect a measurement trigger Parameters lt n gt BUS Sets the Meter to expect a trigger through the IEEE 488 bus or upon execution of a TRG command IMMediate Selects Meter s internal triggering system EXTernal Sets the Meter to sense triggers through the trigger jack on the rear panel of the Meter Examples TRIG SOUR BUS Sets the Meter to expect a trigger through the IEEE 488 bus or upon execution ofa TRG command Query TRIG SOUR Retrieves the trigger source for which the Meter has been set BUS IMM or EXT TRiGger DELay lt n gt Description Sets the delay between receiving a trigger and the beginning of measurement cycle Parameters lt n gt 0to 3600 Delay specified in seconds MINimum Delay set to 0 seconds MAXimum Delay set to 3600 seconds Examples TRIG DEL 14 Sets the trigger delay to 14 seconds Query TRIG DEL Retrieves the amount of time set for a trigger delay TRIG DEL MIN Returns 0 seconds TRIG DEL MAX Returns 3600 seconds TRiGger DELay AUTO lt n gt De
94. he Meter is powered off then back on a statistics function is enabled or the Meter receives a reset through the remote interface This setting is stored in volatile memory Query CALC AVER COUN Returns the count value of the statistics operation CALCulate NULL OFFSet lt value gt MINimum MAXimum Description Sets the offset value used for the zero function Math operation must be enabled to write to the zero offset register This setting is stored in volatile memory Parameters lt value gt 0 to 120 of highest range MINimum Sets offset register to 120 of highest range of selected function MAXimum Sets offset register to 120 of highest range of selected function Examples CALC NULL OFFS 100 Sets zero offset register to 100 Query CALC NULL OFFS Returns the zero offset register value CALCulate DB REFerence lt value gt MINimum MAXimum Description Sets the relative value used for the dB function Math operation must be enabled to write to the dB relative register This setting is stored in volatile memory Parameters lt value gt 0 to 200 dBm MINimum Sets dB relative register to 200 dBm MAXimum Sets dB relative register to 200 dBm Examples CALC DB REF 25 Sets dB relative register to 25 dBm Query CALC DB REF Retrieves the dB relative register value CAL Culate DBM REFerence lt value gt MINimum MAXimum Description Sets the reference impedance for the dBm function Math operation must be
95. he primary display FETCh3 will return a single measurement from the primary display if there is one If a measurement isn t available the command is ignored FETCh3 Retrieves the last measurement from the primary display of the Meter Digital Multimeter Supported SCPI Commands DISPlay lt n gt Description Enables or disables the Meter s display This setting is stored in volatile memory Parameters lt n gt ONorl Enables the display OFF or 0 Disables the display Examples DISP ON Enables the Meter s display Query DISP Retrieves the state of the display 0 OFF and 1 ON DISPlay TEXT lt quoted string gt Description Displays a message on the Meter s display This setting is stored in volatile memory Note The Meter must be remote before executing this command Parameters lt quoted string gt Up to 12 characters Additional characters are truncated Examples DISP TEXT Hello Hello is displayed in the Meter s display Query DISP TEXT Retrieves the text sent to the Meter in a DISP TEXT command DISPlay TEXT CLEar Description Clears the displayed message on the Meter s display Examples DISP TEXT CLE Meter s display message is cleared SYSTem BEEPer Description Causes the Meter to beep once Examples SYST BEEP Meter beeps SYSTem BEEPer STATe lt n gt Description Enables or disables the Meter s beeper This setting is stored in volatile memory Disabling the beeper causes the Mete
96. heieiell libenen Device Dependent Command Set Calibration Commands sisi Dn Display Commands is Gn Get Cominiands uses ni Geaneckiee attente Tn Trigger Mode Commands Wn Terminator Commands Numeric Entry Command Talk Onl Mode sans Rs I In Ranging in 8842A Emulation Mode Operational Differences ss anna a eh en Ha Appendices Error Codes asiccsassasesedaiacceeaataccbacanatececasacessaat detsaaataastecandtecsaateecnsaaatesvaatace Fluke 45 Emulation Limitations 000cccccccccsssscccesssscecsessececeesteceeeesseeeeees Network Consideration ensien innare ss Fluke 8842A Emulation Limitations Jawe iii 8845A 8846A Programmers Manual List of Tables Table Title 1 Safety and Electrical Symbols 2 IEEE 488 Compatibility Codes 3 Factory Settings of RS 232 Communications Parameters 4 Status Register Summary insbes ed an le n e anne dune eus sn ent 5 Description of Bits in ESR and ESE esenseenseenneenneennnnnnnnnnnnn nennen 6 Description of Bits in the Questionable Data Register 7 Description of Bits in the Status Byte Register 8 CALibration command summary 4 44 9 CONFigure command summary eee 10 IEEE 488 2 common command s
97. igger can cause the Meter to take a single measurement or multiple measurements up to 50 000 per trigger Operating the Meter remotely requires selecting one of three trigger methods internal external or bus triggering Once a source is selected the Meter must be in a wait for trigger state before the trigger will start a measurement cycle Figure 4 shows the multimeter s triggering system 55 8845A 8846A Programmers Manual 56 Initiate Triggering Trigger Source Triggering Delay MEASure READ INITiate Wait for TRIGger SOURce IMMediate Trigger TRIGger SOURce EXTernal State TRIGger SOURce BUS Front panel Single key TRIGger DELay Sample Annuniator Measurement Sample Trigger lt lt lt Sample Count 1 Count 1 dae02 eps Figure 4 884XA Triggering System The Meter can be put into a wait for trigger state remotely by sending it a MEASure READ or INITiate command Once received by the Meter it takes approximately 20 ms to setup the Meter and put it in to the wait for trigger state Any triggers received during this set up time are ignored Using the Triggering Commands INITiate Description Examples READ Description Examples Sets the Meter to the wait for trigger state in which the next trigger from the selected source triggers a measurement cycle Up to 5 000 measurements are placed into the Meter s internal memory where they can be retrieved with t
98. in the input for the specified command As an example valid arguments for the FETCH Command are FETCH FETCH1 FETCH2 and FETCH3 If FETCH4 is entered error 137 will be generated Invalid string data The parameters in the Input Command contained an unmatched single or double quote Example DISP TEXT hello world String size The length of the entered string exceeds 12 characters Example CAL SEC CODE this is an example of a long string Unmatched brackets The parameters in the Input Command contain an unmatched bracket Unknown parameter One or more of the parameters contains an unspecified error Too many dimensions Too many dimensions in entry No entry There was no entry to get the index was beyond the end of the entries Generic execution General Execution error has occurred Trigger ignored A Group Execute Trigger GET or TRG was received but the trigger was ignored Make sure the multimeter is in the wait for trigger state before issuing a trigger and make sure the correct trigger source is selected Init ignored An INITiate command was received but could not be executed because a measurement was already in progress Send a device clear to halt a measurement in progress and place the multimeter in the idle state Trigger deadlock A trigger deadlock occurs when the trigger source is BUS and a READ command is received Too much data A character string was received but could not be executed because th
99. ing the Meter gives priority to some types of data over others An input command string may call for more than one output string For example an input string may contain a Get command but also cause an error message However the output buffer is loaded with only one output string That string is selected according to the following priority 1 Status data from GO Gl G3 G4 G5 G6 G7 and G8 2 Error messages if an error exists 3 Numeric data This means that an error message always overrides numeric data but status data is sent even in the presence of an error However the status data does not clear the error message the error message is sent the next time numeric data is requested Service Requests Service requests let bus instruments get the attention of the system controller The requests are sent over the SRQ line one of the IEEE 488 bus lines If more than one instrument on the bus is capable of sending service requests the controller can learn which one made the request by taking a serial poll Each device including the Meter responds to the poll by sending the contents of its serial poll register The serial poll register indicates whether or not the device requested service and if so the reason for the request The Meter may be programmed to make a service request on user specified conditions The conditions are specified by entering a value for the service request mask SRQ mask with the P1 command The SRQ mask w
100. ing configures the meter and triggers a reading The PRINT command automatically sends terminators CR LF and or EOI to the meter at the end of the command string PRINT 3 F3 R4 S1 T2 IEEE 488 bus address Resets the meter to the power up configuration Selects the 2 WIRE kQ function Selects the 200 kQ range Selects the medium reading rate Selects the external trigger mode Rear panel trigger disabled Triggers a reading caw65 eps Figure 5 Typical Command String for 8842A Emulation Examples of 8842A emulation output data show the terminators CR and LF The terminator EOI is not shown because it is a uniline message However the terminators CR LF and EOI are all selectable using the Write commands 77 8845A 8846A Programmers Manual 78 Function Commands V dc Default Vac 2 WIRE kQ 4 WIRE KQ mA dc mA ac Range Commands Autorange On Default 200 mV 200 Q 2V 2 kQ 20 V 20 kQ 200 V 200 kQ 200 mA dc 1000 V dc 700 V ac 2 MQ 2000 mA 20 mQ Autorange Off 20 mV 20 Q Reading Rate Commands So Slow Default S1 Medium S2 Fast Trigger Mode Commands Trigger Setting Mode Command TO Default Internal T External External External External Offset Commands BO Offset Off Default B1 Offset On Display Commands DO Normal Display Default D1 Blank Display Suffix Commands YO Disable Output Sffix Y1 Enable Output Suffix Terminator Comman
101. input buffer for new characters If the input buffer becomes full the Meter stops accepting characters from the bus until all complete command strings currently in the input buffer have been executed In this way characters sent to the Meter are never lost due to buffer overflow In some instances a terminator is automatically transmitted at the end of the controller s output string For example in Fluke BASIC the PRINT statement always finishes with a CR LF pair If a controller does not have this feature the programmer must transmit a terminator explicitly The Meter accepts alphabetic characters in either upper or lower case Spaces commas and control codes are ignored and are not placed in the input buffer If the Meter receives a group of terminators such as CR LF or CR LF EOI only a single terminator is loaded into the input buffer Numeric values used in PUT commands may be in NR1 NR2 or NR3 format as described in the IEEE 488 Codes and Formats Recommended Practice These correspond to the signed integer real number and real number with exponent formats described under the N command Illegal commands e g F9 generate an error message but are otherwise ignored and do not affect the instrument s configuration Example Explanation x F9 This would load the output buffer with an error message and select F1 established by the command Syntax Rules 88 Four syntax rules should be followed when constructin
102. k has a unique address that is assigned by the interface hardware vendor Each vendor is assigned a block of addresses and it is required that each device produced have a unique Ethernet address Users of the TCP IP protocol very rarely need to know or deal with the Ethernet address When TCP IP is used each host is also assigned a unique IP address but this address is assigned when the TCP IP protocol software is initialized In contrast to the Ethernet address IP addresses have a structure that can be used by Network Management to facilitate breaking the network into segments subnets that make better use of the available data communication capacity bandwidth Use of IP addressing and the network segmentation scheme is described in IP Addresses and Segmented Networks in this appendix The relationship between a host s Ethernet address and its IP address is established by the TCP IP protocol software No user interaction is needed to establish this relationship However some network management systems require that the Ethernet address of each network host be kept in a database So it is sometimes necessary to communicate the Ethernet addresses of all devices on the network to the Network Administrator IP Addresses and Segmented Networks If all networks consisted of a few computers and other devices attached to each other locally use of IP addressing and network segmentation schemes would not be necessary However networks have e
103. l STATe OFF ON STATe 32 Path to analog filter Activates or deactivates 3 pole analog filter Retrieve the present analog filter setting Path to digital filter Activates or deactivates digital filter Retrieve the present digital filter setting Path to input impedance selection Turn auto impedance mode off or on Retrieve present setting of auto impedance Set integration time for selected function Retrieve integration time for selected function Set dc voltage range Disable enable Autoranging Retrieve present autorange setting Retrieve the present range setting Set resolution for dc voltage measurement Retrieve dc voltage measurement resolution Path to configure current measurement range Path to ac current range Select filter Retrieve present filter setting Set ac current range Disable enable Autoranging Retrieve present autorange setting Retrieve the present range setting Set resolution for ac current measurement Retrieve ac current measurement resolution Path to dc current range Path to analog filter Set analog filter off or on Retrieve the present analog filter setting Path to digital filter Activates or deactivates digital filter Retrieve the present digital filter setting Set integration time for selected function Retrieve integration time for selected function Set dc current range Disable enable Autoranging Retrieve present autorange setting Retrieve the present range setting Set resolution for dc curr
104. lation Limitations for details on Fluke 8842A commands that are not compatible with this Meter To change the Meter s remote command set 1 Press KH 2 Press the COMMANDS soft key 3 Press the soft key labeled with the desired command set Getting Started With an Installation Test After the Meter has been cabled to a host and prepared to communicate with it via the RS 232 or IEEE 488 interface as described above test the system to verify that it is operational Installation Test for RS 232 Connections The procedure below illustrates how the Meter performs a computer interface command and at the same time confirms that the Meter has been properly set up and connected for RS 232 remote operation 1 Press the POWER button to turn on the Meter 2 Start up a computer terminal program 3 Verify that the computer interface parameters e g baud parity are set correctly 4 Send the Meter the following command IDN lt CR gt 5 Verify that the Meter sends the following response 17 8845A 8846A Programmers Manual In Fluke 8845A mode includes 8846A Fluke 884XA nnnnnnnm mm dd yy tt tt In Fluke 45 mode FLUKE 45 nnnnnnn n n Dn n In these results nnnnnnn is your Meter s serial number n n identifies the main software version and Dn n identifies the display software version Installation Test for IEEE 488 Connections The procedure below illustrates how the Meter performs a computer interface co
105. les SRQ on data available or overrange N1 P1 Sets SRQ mask to 01 A leading zero is assumed Enables SRQ on overrange Rn Range Commands The Range commands duplicate the front panel range buttons For example RO selects autorange and R3 selects the 20V 20 KQ range The R7 command turns autorange off just as the RANGE button does when it is toggled Command R7 puts the Meter into manual range selecting whatever range the instrument is in when the command is received The Meter defaults to RO on power up and any device clear command DCL or SDC The range setting can be read using the GO command Sn Reading Rate Commands The 8842A defaults to SO on power up and any device clear command DCL or SDC The reading rate can be read using the GO command The reading rate command also selects the number of digits displayed and the filter setting Tn Trigger Mode Commands The Trigger Mode commands duplicate the front panel TRIG button In addition the commands can enable or disable the automatic settling time delay Note The front panel TRIG button is enabled only while the instrument is under local control In the continuous trigger mode TO triggers are initiated at the selected reading rate Each new reading is loaded into the output buffer as it becomes available unless the Meter is busy sending previous output data The trigger mode can be read using the GO command The Meter defaults to TO on both po
106. low current parameter sets the diode test current to 0 1 mA When OFF the current is 1 mA When set to ON the high voltage parameter sets the diode test voltage to 10 volts When OFF the voltage is 5 volts To specify a diode test voltage you must also include ON or OFF for the low current parameter 6 The range and resolution are fixed for continuity tests 1 kO range and 5 digits 7 DC measurement voltage divided by dc reference voltage For dc ratio connect the reference HI LO to the HI LO sense terminals of the Meter and the measurement voltage to the HI LO input terminals of the Meter Note the specified measurement range applies to the input terminals only Note For best results in RATIO the two input commons must be shorted at the Meter terminals The analog filter AFLTR should be off Using the CONFigure Command The CONFigure command allows more configuration control than the MEASure command As with the MEASure command the CONFigure command presets the Meter s parameters for the desired configuration See Table 18 However a measurement does not start automatically and therefore affords the opportunity to change measurement parameters prior to triggering a measurement The CONFigure command is very useful when most of the parameters preset by CONFigure are what you want and you only need to change one or two parameters The 39 8845A 8846A Programmers Manual SENSe FUNCtion command provides a means of cha
107. low filter 20 default Selects medium filter 200 Selects fast filter MIN Selects slow filter MAX Selects fast filter Examples VOLT AC BAND 20 Sets the filter for ac voltage to medium Query VOLT AC BAND Returns the filter selection SENSe DETector BANDwidth lt n gt Description Sets the appropriate filter for the frequency specified by lt n gt This setting is stored in volatile memory and sets the filter for all functions that use an ac filter Parameters lt n gt 3 Selects slow filter 20 Selects medium filter 200 Selects fast filter MIN Selects slow filter MAX Selects fast filter Examples DET BAND 20 Sets the filter to medium Query DET BAND Returns the filter selection DET BAND MAX Returns 2 00000000E 02 to indicate the fast filter SENSe FILTer DC STATe lt n gt Description Activates or deactivates the 3 pole analog filter to improve noise immunity for de functions This setting is stored in volatile memory OFF or 0 ON or 1 Turns the analog dc filter off Turns the analog dc filter on Parameters lt n gt 47 8845A 8846A Programmers Manual Examples FILT ON Turns the analog dc filter on Query FILT Returns the analog dc filter setting Note Since the corner frequency of the analog filter is about 8 Hz the filter does not add much rejection until frequencies are significantly higher than that SENSe JFILTer DC DiGital STATe lt n gt Description Activates or deactiva
108. lt mm dd yyy gt Sets the Meter s date DATE Retrieves the Meter s date ERRor Retrieve meter s error queue ERRor BEEPer OFF ON Enable disable beeper for errors ERRor BEEPer Retrieve beeper state for errors TIME lt hh mm ss gt Sets the Meter s time TIME Retrieves the Meter s time VERSion Retrieve meter s SCPI version DATA Path to meters memory POINtS Retrieve the number of stored readings RST Reset Meter to its power on state IDN ON OFF Quoted String Enables or disables a secondary indentification defined by the quoted string When disabled IDN will return the indentification set by the Meter s manufacturer Retrieve meter s identification string Set the command language to 8845A 46A Set the command language to Fluke 45 Set the command language to Fluke 8842A 1 Default parameters are shown in bold 36 Digital Multimeter Supported SCPI Commands Table 17 Triggering Command Summary INITiate DATA F ED RDG_STORE CALCulate FEED READ SAMPle COUNt lt value gt MINimum MAXimum COUNt MINimum MAXimum TRIGger COUNt lt value gt MINimum MAXimum INFinite COUNt MINimum MAXimum DELay lt seconds gt MINimum MAXimum AUTO OFF ON AUTO DELay MINimum MAXimum SOURce Bus IMMediate EXTernal SOURce 1 Bold type denotes default parameter SCPI Command Details Set trigger system to wait for trigger Path
109. mVdc 100 mVdc 200 mVac 1 Vac lt 10 Vac 100 Vac 1000 Vac 1000 Vac RS E es o e a o e C A Ohms 2W IDC ADC Operational Differences When changing the measurement resolution the 0 HFLE setting is not an available selection This selection would result in a measurement rate that would be much faster than the 8842A could achieve The 8842A emulation selection does not appear when attempting to select a command language whenever the 8845A or 8846A has a port selection of RS 232 or LAN This is due to the fact that the Fluke 8842A does not have a serial or Ethernet interface This also means that RS 232 or LAN port selections are not available whenever the 8845A or 8846A is set to the 8842A emulation mode Pressing RESET 0 followed by RESET resets the Meter back to 8842A defaults 115 8845A 8846A Programmers Manual 116 C Command Strings Rules for bar H HP 34401 supported commands 28 IEEE 488 Port Setting the address ll Interfaces Ehternet LAN 12 General RS 232C Intrefaces IEEE 488 4 L LAN DHCP Enable Disable IP Address Setting of Subnet Mask Setting of 0 Output Processing of L2 P Programming Language Setting of R Remote Operation bl RS 232C Port Baud Rate Setting of id Index Computer Mode Selecting of el Data Bits Setting of Echo Enabling Disabling of ay End Of Line EOL Setting of
110. mmand and at the same time confirms that the Meter has been properly set up and connected for IEEE 488 operation 1 Turn on the Meter 2 Verify that the meter s IEEE 488 address is set correctly 3 Turn on the host or controller 4 Enter the following at the host Note This is a BASIC program to give an idea of how the test could be done Syntax may vary with the host INIT PORT 0 lt CR gt CLEAR PORT 0 lt CR gt PRINT lt address of meter gt IDN lt CR gt INPUT LINE lt address of meter gt A lt CR gt PRINT A lt CR gt 5 Verify that the meter sends the following response In Fluke 8845A mode includes 8846A Fluke 884XA nnnnnnnm mm dd yy tt tt In Fluke 45 mode FLUKE 45 nnnnnnn n n Dn n In these results nnnnnnn is your meter s serial number n n identifies the main software version and Dn n identifies the display software version If The Test Fails If the Meter does not respond to the test procedure as indicated 1 Check all cable connections 2 Check to see the remote interface has been properly enabled and addressed 18 Digital Multimeter How the Meter Processes Input How the Meter Processes Input The following paragraphs summarize how the Meter processes input that is received from a host or stand alone terminal Note In this manual input means a string sent to the Meter from a host Output means a string sent from the meter through the computer interface to the host In
111. n Table 29 All available trigger methods fall into two basic categories e Internal triggering uses the Meter s internal trigger circuit for a continuous source of triggers e External triggering comes from a source outside the Meter controlled by the user Setting the Trigger Type Configuration To select a trigger type over the computer interface send the command TRIGGER lt type gt where lt type gt is a number between 1 and 5 that identifies a trigger type If lt type gt is not one of these numbers an Execution Error is generated Select a trigger type that enables the settling delay type 3 or 5 when the input signal is not stable before a measurement is triggered 75 8845A 8846A Programmers Manual External Triggering A measurement can be externally triggered in three ways e External trigger e GET command IEEE 488 Interface only e TRG command To trigger a measurement over the RS 232 or IEEE 488 computer interface send the Meter a TRG command over the computer interface The GET command is only valid for the IEEE 488 interface When set for external trigger the Meter will trigger measurements when a negative going signal is applied to the rear panel trigger jack Note The Fluke 45 provides a method of triggering through its RS 232 port The 8845A and 8846A do not provide this method of triggering Table 29 Trigger Types Type Trigger Rear Trigger Settling Delay 1 Internal 2 External
112. nction Query CALC STAT Returns the state of the math function 0 OFF and 1 ON CAL Culate AVERage MINimum Description Retrieves the minimum value measured during a statistics operation This value is cleared whenever the Meter is powered off then back on a statistics function is enabled or the Meter receives a reset through the remote interface This setting is stored in volatile memory Query CALC AVER MIN Returns the minimum value of the statistics operation CALCulate AVERage MAXimum Description Retrieves the maximum value measured during a statistics operation This value is cleared whenever the Meter is powered off then back on a statistics function is enabled or the Meter receives a reset through the remote interface This setting is stored in volatile memory Query CALC AVER MAX Returns the maximum value of the statistics operation CAL Culate AVERage AVERage Description Retrieves the average value measured during a statistics operation This value is cleared whenever the Meter is powered off then back on a statistics function is enabled or the Meter receives a reset through the remote interface This setting is stored in volatile memory Query CALC AVER AVER Returns the average value of the statistics operation 52 Digital Multimeter Supported SCPI Commands CALCulate AVERage COUNt Description Retrieves the number of measurements taken during a statistics operation This value is cleared whenever t
113. new input terminator the Data Available bit in the serial poll register is set false When this bit is false data can no longer be read from the output buffer Therefore an output string which is available must be read by the controller before rather than after the next input command string is sent Rule 3 is most evident in the external trigger mode and is best demonstrated by a programming example The following program is written first incorrectly and then correctly in Fluke BASIC using the 1722A Instrument Controller Incorrect Example 100 PRINT 3 T1 200 PRINT 3 F4 300 INPUT 3 A In this incorrect example the INPUT statement is located incorrectly for reading the measurement data from line 100 The new input command string F4 disallows the reading of data from the output buffer Correct example 100 PRINT 3 TL 200 INPUT 3 A 300 PRINT 3 F4 e RULE 4 If an input command string contains a trigger enter the commands in the following order a Commands to configure the instrument if any b The trigger command c Commands to re configure the instrument if any d Terminator s The principle behind this rule is that the 8842 A executes all commands in the exact order they are received from left to right as written Example Explanation F3 F4 Improper construction F3 is effectively discarded F3 Fa Correct construction The Meter is configured in F3 and the trigger i
114. nging a function s parameters Other commands such as INPut SENSe CALCulate and TRIGger allow for more detailed control of the Meter s parameters The CONFigure command does not initiate a measurement and will need to be followed by READ command or the INITiate and FETCh commands CONFigure SCALar lt function gt lt range MIN MAX DEF gt or lt RTD type gt or lt low current gt lt resolution MIN MAX DEF gt or lt high voltage gt Description Sets the Meter function with the preset parameters See Table 18 and configure the Meter using the specified range and resolution This command must be followed by aREAD command or the INITiate and FETCh commands to cause the Meter to take a measurement For the temperature function the range variable is replaced by the RTD type variable Note The dc portion of the function keyword is optional as is the VOLTage portion For instance CONF AC will be interpreted by the Meter as meaning Volts ac function Parameters lt function gt CAPacitance CURRent AC CURRent DC VOLTage AC VOLTage DC VOLTage DC RATio RESistance FRESistance FREquency PERiod TEMPerature RTD TEMPerature FRTD Capacitance AC current DC current AC voltage DC voltage DC voltage ratio 2 wire resistance 4 wire resistance Frequency Period 2 wire temperature 4 wire temperature DIODe Diode CONTinuity Continuity lt range gt a number between the upper
115. nts virtually all of the commands available for the Fluke 45 Fluke 8842A and HP 34401A with the exception of the self test and calibration commands You must always calibrate the Meter using the SCPI language setting The calibration commands from the other multimeters will not be executed Be aware that measurement timing triggering and range mapping may be different in the alternate language compatibility modes 67 8845A 8846A Programmers Manual FLUKE 45 Command Emulation Summary Computer Interface Command Set RS 232 and IEEE 488 commands grouped by related function are listed in the tables that follow These commands are identical except where indicated A parameter that must be supplied by the user or a string returned by the Meter is enclosed in angle brackets lt value gt IEEE 488 Common Commands Table 20 Function Commands and Queries Table 21 Function Modifier Commands and Queries Table 22 Range and Measurement Rate Commands and Queries Table 23 Measurement Queries Table 24 Compare Commands and Queries Table 25 Trigger Configuration Commands Table 26 Miscellaneous Commands and Queries Table 27 RS 232 Remote Local Configuration Commands Table 28 IEEE 488 Capabilities and Common Commands Table 20 summarizes the IEEE 488 Commands that are common between the Fluke 8845A 46A and the Fluke 45 Table 20 IEEE 488 2 Common Commands ESE ESR Command Name Description CLS
116. o Power On PON Power has been cycled off and on since the last time the ESR was read or cleared Questionable Data Event Register and Questionable Data Enable Register The Questionable Data Event Register provides information about the Meter s measurements Information such as overload conditions high low limits and whether or not the Meter is in remote mode can be reported through the questionable data summary bit Once a bit is set by the Meter it remains set until it is read from the register or is cleared The sixteen bits of the Questionable Data Event Register are described in Table 6 The Questionable Data Enable Register determines which of the bits in the Questionable Data Event Register will be used to the set the Questionable Data Summary bit in the Meter s Status Byte When a bit in the Questionable Data Enable Register is 1 the corresponding bit in the Questionable Data Event Register is enabled When any enabled bit in the Questionable Data Event Register changes from 0 to 1 the Questionable Data bit in the Status Byte Register also goes to 1 When the Questionable Data Event Register is read using the STAT QUES EVEN command or cleared using the CLS command the Questionable Data bit in the Status Byte Register returns to 0 25 8845A 8846A Programmers Manual 26 Table 6 e RE N of Bits in the Questionable Data Register Voltage Overload Input voltage has exceeded the upper limit of the range C r
117. o be returned SYSTem ERRor BEEPer lt n gt Description Enable or disables the Meter s beeper for error messages This setting is stored in volatile memory Parameters lt n gt ONorl Enables beeper for error messages OFF or 0 Disables beeper for error messages Examples SYST ERR BEEPON Set Meter to beep when errors are detected Query SYST ERR BEEP Returns state of beeper for error messages 0 OFF and 1 ON STATus QUEStionable ENABle lt n gt Description Enables or disables bits in the Meter s Questionable Data enable register Parameters lt n gt 0t0 65535 Binary weighted decimal value representing the bits to set in the register Although a 16 bit register that will accept a number between 0 and 65535 only bits 0 1 9 11 12 and 13 are used Examples STAT QUES ENAB4 Sets bit 2 to one and all others to zero Query STAT QUES ENAB Retrieves a binary weighted decimal value representing the bits set in the questionable data enable register STATus QUEStionable EVENt Description Enables or disables bits in the Meter s Questionable Data event register Parameters lt n gt 0t0 65535 Binary weighted decimal value representing the bits to set in the register Although a 16 bit register that will accept a number between 0 and 65535 only bits 0 1 9 11 12 and 13 are used Query STAT QUES EVEN Retrieves a binary weighted decimal value representing the bits set in the questionable data event re
118. o put data on the bus when to make service requests etc The complete set of device dependent commands is listed in Figure 6 The commands may be entered using either upper or lower case letters Device dependent commands are device dependent messages For the Meter to receive them they must be sent over the IEEE 488 bus when the Meter is in remote and has been addressed as a listener The following paragraphs describe the device dependent commands in alphabetical order Special characters and are described last Bn Offset Commands When the Meter receives the Bl command the Meter stores the present reading as an offset for the present function The BO command cancels the offset Only one offset is allowed at a time The offset status not the offset value can be read using the G5 command The Meter defaults to BO on both power up and on any device clear command DCL or SDC Dn Display Commands The Display commands allow the user to blank the display in the Meter The DO command causes the display to operate normally and is the default on power up and upon any device clear command DCL or SDC The D1 command blanks the display The D1 command is used for best performance when high IEEE 488 Interface Data rates are required Fn Function Commands The function commands duplicate the front panel function buttons The Meter defaults to Fl on power up and on any device clear command DCL or SDC If FO is sen
119. of commands for the 8842A command emulation A few definitions are presented first followed by a description of how the Meter processes input commands Guidelines are then summarized in four syntax rules Definitions e Output commands Commands which load data into the output buffer The output commands are the Get commands GO through G8 the Single Trigger Command the Continuous Trigger command T0 and Group Execute Trigger GET not to be confused with the Get commands e Input terminator An ASCII control code sent by the controller which tells the Meter to execute all device dependent commands since the previous terminator Terminators are CR Carriage Return LF Line Feed EOI End Or Identify and GET Group Execute Trigger e Input command string One or more device dependent commands followed by a terminator Input Processing When the Meter receives commands from the bus it stores them in a 350 character input buffer as a continuous string of characters Commands in the input buffer are not executed or checked for syntax until an input terminator is received or the input buffer becomes full The only valid input terminators are CR LF GET Group Execute Trigger and or EOI 87 8845A 8846A Programmers Manual When the Meter receives an input terminator it executes the previous commands in the order in which they were received As input characters are processed and executed space is made available in the
120. ompatibility FLUKE 45 Command Emulation Summary Computer Interface Command Set IEEE 488 Capabilities and Common Commands nen Triggering Output tsinintssr dti N E Using FlukeView Forms FLUKE 8842A Emulation Mode Example Notes isi rhinite metenettieniees Device Dependent Command Set uunsnnsenseenseenseennneenneennnnnn nennen Input SYNTAX i ac csve nck ed cccatancedcagaadevestcacead eauteedaieenesedvas leet sits cpu accaedeceavaccevubisdaees Output D ta u an een users 8 SEFVICE Req ests eyector iie E EEE E EEE Introduction MR E E E S Introduction tn ensure Incompatible Fluke 45 Commands 0 cccccecsseessecssecseceeceseceseeneeeeeeseeeesnenses Dual FUN CHONG issues sun anti denied ati Reading Rates sesiooni e A O AR RANBES 2 E E E A E E E E nas tue else tige tee Introduction Renee Your Meter and Your Network Administrator eeesneseneenneennennee ne Network Primei ersa onnaa a E E meer nein ee 4 4 qqqqqcgc adaddyy Contents continued Physical Layer Wiring Schemes Supported by the Meter Network Interconnection Devices unuesssessnssneeeneennenennennnennennnnnnnnnnnnnnenn Basic Network Packet and Frame Contents ceneneneeeenennnnennne ne IP Addresses and Segmented Networks c ccssccssessseceteceseeeteeeeeeseeesneenees TCP IP Protocol Stack een isn Introduction uassciestisknteikaisiilleliilerksiic
121. ompatible functions there are numerous dual display functions that are not part of the 884XA meter s capabilities Table 37 is a matrix that indicates the Fluke 45 dual functions and whether or not they are compatible with the Meter 103 8845A 8846A Programmers Manual Table 37 Fluke 45 Dual Function Compatibility Matrix Primary Secondary Function Functions Reading Rates Like the 884XA meters the Fluke 45 has multiple but different reading rates The reading rates for the 884XA meters are based on the Number of Power Line Cycles NPLC which are explained in the Users Manual The Fluke 45 on the other hand has just three reading rates selected as Fast Medium and Slow To be compatible with Fluke 45 code the 884XA meters will use a reading rate of 2 5 5 and 20 readings per second respectively Ranges The Fluke 45 changes range at different points than the 884XA For example the 884XA dc voltage range changes occur at 120 mV 1 2 V 12 V and 120 V The Fluke 45 on the other hand changes ranges at the same points when it is in Slow resolution but for Medium and High resolution changes occur at 300 mV 3 V 30 V and 300 V The 884XA meters will respond to a range query with the expected Fluke 45 range whenever the range has previously been set by a range set command However when the 884XA meters are set to VDC VAC or OHMS with autorange enabled and measuring with Medium or High resolution the range returned to a
122. on on these standards Your Meter and Your Network Administrator Before you place the Meter on your company network you need to coordinate with your Network Administrator Specifically before installing and setting up your Meter and host PC you need to ask the following questions 1 Does the network allow static addresses If so what values should I use for my IP addresses and Subnet Mask Does the Socket Port Number need to be changed from the default 3490 2 Does the network contain more than one subnet If so what is the IP address of my default gateway or router device 3 Will all the routers route IP packets 4 What are my domain and host names optional The minimum information you need to get is the IP Addresses for each meter If your network contains more than one subnet and you want to place the host PC and one or more instruments in different subnets you must also set the default gateway address and subnet mask on the Meter and the host PC The Meter may use DHCP to get an IP address subnet mask and default gateway address automatically on the network Your Network Administrator may also need to know the Ethernet MAC addresses of each Meter that you will attach to the network You may obtain the address ofthe Meter by using the front panel controls Read Network Primer for more information on IP addressing and the other information needed to operate the Meter on a local area network LAN 8845A 884
123. on steps with values Parameters lt step gt See the 8845A 8846A Service Manual Examples CAL STEP 5 Sets the calibration step to number 5 Query CAL STEP Returns the Meter s calibration step Using RS 232 Ethernet Interface Commands There are four remote commands that are specifically applicable to controlling the Meter using the RS 232 or Ethernet remote interface SYSTem LOCal Description Places the Meter in the local mode Front panel keys still function Example SYST LOC 65 8845A 8846A Programmers Manual 66 SYSTem REMote Description Places the Meter in the remote mode for RS 232 or Ethernet remote control All front panel keys except the local key are disabled Example SYST REM Note To avoid unpredictable operation send a SYS REM command to the Meter before sending or receiving data over the RS 232 or Ethernet interface SYSTem RWLock Ctrl C Description Like the SYST REM command this command places the Meter into remote mode but with all front panel keys including the local key disabled Example SYST RWL Description Immediately stops transfers of data over the RS 232 interface and clears any output data Note This the same as sending a device clear over the IEEE 488 bus Command Terminators A command string sent to the Meter must terminate with a lt new line gt character The IEEE 488 EOI end or identify message is interpreted as a lt new line gt character and can be used to
124. or Commands The 8845A 8846A does not support W6 Enable EOI Only or W7 Disable All Output Terminators in 8842A emulation When sent to the Meter W6 and W7 will be ignored Numeric Entry Command Because the P2 and P3 calibration commands aren t supported entering numerical exponent values are limited to the PO Put Instrument Configuration and P1 Put SRQ Mask commands PO is limited to numbers between 1000 and 6824 and the P1 command is limited to numbers between 0 and 63 Talk Only Mode The 8845A 8846A does not support Talk Only mode However it does support TALK mode which means the controller can address the unit to talk and read measurements from the IEEE 488 bus at any time provided there is a measurement there to be read Ranging in 8842A Emulation Mode The 8842A has range boundaries in orders of 2 2 20 and 200 Furthermore the maximum current input is 2 A and the maximum resistance measurement is 20 MQ To simulate 8842A ranging using the 884XA design the 8845 A 8846A selects the higher range e g if the user selects the 2V 8842A range the 8845 A 8846A selects the 10V range in 8842A emulation mode Table 41 lists the range mapping of the 8845A or 8846A while in the 8842A emulation mode Digital Multimeter Operational Differences Table 41 8842A Virtual Range Mapping Function 8842A Range 8842A Range Value 8845A 88446A Range BEER lt g O 200 Vdc 1000 Vdc 1000 Vdc 1000 Vdc 20
125. or the secondary display FUNC2 returns FREQ Resistance AC volts DC volts 70 Digital Multimeter FLUKE 45 Command Emulation Summary Function Modifier Commands and Queries The commands in Table 22 relate to the function modifiers A function modifier causes the Meter to modify the normal operation of a measurement function or perform an action on a measurement before displaying a reading Table 22 Function Modifier Commands and Queries Command Description AFILT on off Activates or deactivates the 3 pole analog filter to improve noise immunity for dc functions This filter is only available in DCV DCI 2 Wire and 4 Wire resistance The default setting is OFF If an attempt is made to enable the filter in a mode not permitted the request is ignored AFILT Returns the state of the analog filter DB Meter enters decibels modifier Any reading shown in the primary display is in decibels An Execution Error is generated if the meter is not in a volts ac and or dc function DBCLR Meter exits the decibels modifier and displays readings in normal units Also clears dB and Power modifiers DBPOWER Meter enters dB Power modifier if the reference impedance is set to 2 4 8 or 16 ohms and a voltage function has been selected Otherwise an Execution Error is generated In dB Power readings shown in the primary display are in watts DBREF lt value gt Set dB reference impedance to a lt value gt shown in Ta
126. orks by monitoring the serial poll register which in turn monitors various conditions in the Meter The Serial Poll Register The serial poll register is a binary encoded register which contains eight bits as illustrated in Table 31 The controller can read the Meter serial poll register at any time 91 8845A 8846A Programmers Manual 92 by taking a serial poll Because serial poll register data is loaded directly onto the bus instead of being loaded into the output buffer first reading the serial poll register leaves data in the output buffer intact The eight bits of the serial poll register are described in Table 32 Note that the SRQ mask uses bits 1 through 6 to set bit 7 the RQS bit When the RQS bit is set true the Meter sets the SRQ line true which generates a service request A bit is considered true when it is set to 1 For example the serial poll register reads 00010000 binary when data is available This value is read in binary by the controller which might numerically reformat the value to 16 decimal or 10 hexadecimal The serial poll register is cleared whenever the Meter receives a new input command string Table 31 Serial Poll Register CRE a Ne es ee ee Data value Pe e fe fe fe EBEN Value Table 32 Serial Poll Register Description en nme VE m 1 Overrange An overrange condition occurs Device command received or Bus or rear panel trigger or Output buffer is read Eux nue fus
127. put Strings The meter processes and executes valid input strings sent by the host A valid input string is one or more syntactically correct commands followed by an input terminator When the meter receives input it stores it in a 350 byte input buffer Note Input strings received over the RS 232 interface are not executed or checked for proper syntax until an input terminator is received or the input buffer becomes full The Meter accepts alphabetic characters in either upper or lower case Ifa command cannot be understood i e the equivalent of an IEEE 488 Command Error the remainder of the command line is ignored Input Terminators An input terminator is a character or command IEEE 488 1 sent by the host that identi fies the end of a string In RS 232 applications when the Meter receives an input terminator it executes all com mands entered since the last terminator was received on a first in first out basis As input characters are processed and executed space is made available in the input buffer for new characters In RS 232 applications if a communications error e g parity framing over run is detected a device dependent error is generated and the input string is discarded If the Meter s input buffer becomes full when it is used with the RS 232 interface a device dependent error is generated see Event Status and Event Status Enable Register and the input string is discarded If on the other hand the inp
128. r 5 With the desired address set press ENTER To set the Meter to Fluke 45 emulation 1 Press 2 Press the COMMANDS softkey 3 Press the FLUKE 45 softkey Operating with FlukeView Forms When first powered up FlukeView Forms sends remote commands to the serial port asking an instrument to identify itself Because the Meter does not recognize the commands for the other instruments an error indication Syntax error 102 is shown on the Meter s front panel This cannot be avoided and is considered normal operation See FlukeView Forms documentation for information on setting up that application When controlling the Meter with FlukeView Forms ECHO must be set to NO ECHO and the Fluke 45 Command language must be selected Interconnections The Meter communicates with a host through a DB 9 interface connector on the rear panel of the Meter Connect the Meter to the host or terminal using a cable appropriate to your application that is less than 50 feet 15 meters long Longer cables are permitted providing that the load capacitance measured at the interface point including the signal terminator does not exceed 2500 picofarads Figure 1 shows the pin out of the Meter s RS 232 port and two possible cable connections for communicating with a PC Fluke 8842A Emulation Mode The Fluke 8842A emulation mode is only available when the Meter has the IEEE 488 port selected To change the Meter to Fluke 8842A Emulation Mode set
129. r A 8842A calibration command was command not valid entered The 8845A 46A does not support 8842A calibration commands 8840 Syntax Error 8842A emulation error An improper command was entered This error will occur when the command header is not formed properly and fails to pass 8842A header syntax rules IG Invalid Invalid response type from inguard IG Packet size Incorrect packet size from inguard Trigger ignored Trigger ignored Configuration Wrong number configuration acknowledgement acknowledgement Digital Multimeter Introduction Table 33 Execution Error Codes and Descriptions cont 421 Instrument configuration Tried to set invalid state invalid 422 Instrument configuration Invalid parameter parameter 426 Instrument configuration Instrument configuration load failed load CCO Name bad CCO constant name is bad 511 RS 232 framing parity overrun error RS 232 fatal error A fatal error occured opening the serial port RS 232 Configuration A fatal error occured while configuring the serial port commands are LOCS REMS RWLS and LWLS Command line too long The command line exceeded 350 characters 514 Command allowed only Commands which are only allowed with the RS 232 Ethernet with RS 232 interface are SYSTem LOCal SYSTem REMote and SYSTem RWLock or in Fluke 45 emulation mode the Output buffer overflow Insufficient memory There is not enough memory to store the requested number of
130. r network hosts such as other hubs routers and bridges A hub is sometimes referred to as a network switch The 10 100BaseT wiring method is very popular because the wire is inexpensive to purchase and install the use of a hub allows some protection from malfunctioning network hosts and this type of wiring is easier for network administrators to manage and control Digital Multimeter Network Primer Network Interconnection Devices The following basic devices are used in networks to extend partition and interconnect networks e A repeater is a device used to physically isolate and extend the length of a network segment but it does not divide the network into subnets e A hub is a device that allows communication among multiple 10 100BaseT network hosts and allows these hosts to communicate with other Ethernet wiring Some hubs also perform Router functions e A Bridge is used on Ethernet networks to isolate two portions of the network at the Frame level see Basic Network Packet and Frame Contents later in this appendix This is done to minimize transmission collisions but the two portions isolated by a Bridge remain on the same subnet A Bridge also acts as a Repeater e A Router is used to isolate two portions of the network into subnets as described in IP Addresses and Segmented Networks in this appendix A router also acts as a bridge Make sure your router will route IP packets if you want to place the PC and the Met
131. r to not beep for the following conditions a new minimum or maximum is detected during statistics a limit is exceeded during a limits test a forward biased diode is measured during a diode test Parameters lt n gt ONorl Enables the Meter s beeper OFF or 0 Disables the Meter s beeper Examples SYST BEEP STAT ON Enables the beeper Query SYST BEEP STAT Retrieves the state of the Meter s beeper 0 OFF and 1 ON SYSTem DATE lt date gt Description Sets the system clock date 59 8845A 8846A Programmers Manual Parameters Examples Query lt date gt MM DD YYYY or MM DD YYYY MM between 1 and 12 DD between 1 and 31 YYYY between 1970 and 2038 SYST DATE 10 25 2007 SYST DATE Returns the Meter s system clock date SYSTem TIME lt time gt Description Parameters Examples Query Sets the system clock time in 24 format lt time gt HH MM SS or HH MM SS HH between 0 and 23 MM between 0 and 59 SS between 0 and 59 SYST TIME 14 25 10 Sets time to 2 25 10 PM SYST TIME Returns the Meter s system clock time SYSTem VERSion Description Examples DATA POINts Description Examples AST Description Examples Retrieves the Meter s present SCPI command version SYST VERS Returns the SCPI version Retrieves the number of measurements contained in the Meter s internal memory DATA POIN Returns number of measurements in internal memory Resets the Meter to
132. ration Errors nenne 35 Calibration Errors R a EEE 8845A 8846A Programmers Manual 36 Non compatible Fluke 45 Remote Commands nsenneneenennneenne ne 37 Fluke 45 Dual Function Compatibility Matrix 38 IP Address Assignment us 39 8842A Device Dependent Commands Not Supported 40 Fluke 8845 A 8846A Commands the Fluke 8842A Doesn t Support 41 8842A Virtual Range Mapping vi List of Figures Figure Title Page 1 RS 232 Pin out and Cable Interconnect 2 Typical IEEE 488 Input String eenensensensennsnsenseennensennen nennen 3 Overview of Status Data Structure 8845A 8846A and Fluke 45 4 884XA Triggering System ses 7 8842A Emulation Data Output Format vii 8845A 8846A Programmers Manual viii Remote Operation Introduction Remote operation of the 8845A or 8846A Digital Multimeter hereafter the Meter from a host that is a terminal controller PC or computer is accomplished by sending commands to it through one of its remote interfaces This manual describes how to setup configure and operate the Meter through each of the remote interfaces The Meter is controlled remotely using either Standard Commands for Programmable Instruments SCPI Fluke 45 or Fluke 8842A 8840A and 8842A
133. rent Overload Input current has exceeded the a a limit of the range NotUsed Used The resistance measurement has Ohms Overload exceeded the upper limit of the on Not Used Limit Test Fail Lo a measurement is below the low end of the test limit ER s The measurement is above the Remote Mode The Meter is set in remote mode Meter is set in remote mode Status Byte Register The Status Byte Register STB is a binary encoded register that contains eight bits Note that the Service Request Enable Register SRE uses bits 1 through 5 and bit 7 to set the request service RQS bit 6 as enabled by the SRE When the RQS bit is set true 1 the Meter sets the SRQ line true 1 which generates a service request The eight bits ofthe Status Byte Register as read by the STB command are described in Table 7 Reading the Status Byte Register The host can read the Status Byte Register by performing a serial poll or sending the Meter a STB query The value of the status byte is not affected by the STB query When the Status Byte Register is read an integer is returned This integer is the decimal equivalent of an 8 bit binary number For example 48 is the decimal equivalent of the binary 00110000 and means that bit 4 Message Available and bit 5 Standard Event are set to 1 If the status byte is read by serial poll bit 6 is returned as a request service RQS if it is read with an STB query bit 6 is returned as Master S
134. ription Parameters Examples Query Sets the range according to the value supplied for n of the Meter function specified in the variable lt function gt Not having selectable ranges an error is returned when using temperature diode test or continuity as the function with the RANGe command This setting is stored in volatile memory For the frequency and period functions the range command value refers to the signal s input voltage and not the range of the frequency or period measurement Also the word VOLTage must follow the function before the RANGe command See examples below lt n gt value of reading Expected reading in volts amps or ohms MINimum Lowest range MAXimum Highest range VOLT RANG 10 Sets the Meter s dc volts to the 10 volt range CURR AC RANG le 3 Sets the Meter s ac amps to the 100 mA range RES RANG 20e3 Sets the Meter s ohms to the 100 kQ range FREQ VOLT RANG 5 Sets the voltage input range to the 10 volt range for frequency measurements VOLT RANG Returns the set range for dc volts VOLT RANG MIN Returns the minimum range of the de volts function 1 00000000E 01 or 100 mV RES RANG MAX Returns the maximum range of the 2 wire resistance function 1 00000000E 09 or 1 GQ SENSe lt function gt RANGe AUTO OFF ON Description Switches the Meter between autoranging and manual ranging Not having selectable ranges an error is returned when the temperature diode test or continuity f
135. s executed Then the Meter is left in F4 Output Data The following paragraphs describe the data that can be loaded into the output buffer of the Meter and sent to the IEEE 488 bus The paragraphs describe how and when data is loaded into the output buffer the types of output data and their relative priority Note that the Meter can also send data to the IEEE 488 bus from the serial poll register For a description of this data see the Status Data section later in the manual Loading Output Data The output buffer is loaded when the Meter receives an output command or when an error occurs Output commands are those device dependent commands which load the output buffer with data 89 8845A 8846A Programmers Manual e Get commands GO through G8 e Single trigger command e Group execute trigger GET e Continuous Trigger TO Because the Meter gives priority to input processing it completely processes all characters in the input buffer before it loads the output buffer When the output buffer is loaded the Data Available bit in the serial poll register is set true Data from the output buffer is not actually loaded onto the IEEE 488 bus until the controller addresses the Meter as a talker This is done by sending the interface message MTA My Talk Address Types of Output Data The types of data that can be loaded into the output buffer are shown in 7 Each type has its own format Error messages which are loade
136. s frequency function Selects period function Selects capacitance function Selects 4 wire temperature function Selects 2 wire temperature function Selects continuity function Selects diode function Retrieves present Meter configuration Table 10 IEEE 488 2 Common Command Summary CLS ESE lt enable value gt ESE ESR IDN OPC OPC PSC 0 1 PSC RST SRE lt enable value gt SRE STB TST TRG Clear status byte summary and all event registers Enable bits in standard event register Retrieve standard event enable register Retrieve standard event register Retrieve meter s identification string Set Operation Complete bit in Standard event reg Returns 1 in output buffer after command execution Power on status clear Retrieve power on status clear setting Reset Meter to its power on state Enable bits in status byte register Retrieve bits in status byte register Retrieve the status byte summary register Perform self test Returns 0 if the test succeeds 1 ifthe test fails Trigger a measurement 29 8845A 8846A Programmers Manual Table 11 Math Command Summary CALCulate AVERage MINimum MAXimum AVERage COUNt DB REFerence lt value gt MINimum MAXimum REFerence DBM REFerence lt value gt MINimum MAXimum REFerence FUNCtion NULL DB DBMJAVERagelLIMIt FUNCtion KMATh STATe onloff MMFactor
137. scription Enables or disables automatic trigger delay The amount of delay is set based on selected function integration time and filter setting When a specific trigger delay is set using the TRIG DELAY lt n gt command automatic trigger delay is disabled This setting is stored in volatile memory Parameters lt n gt ONorl Automatic trigger delay is enabled OFF or 0 Automatic trigger delay is disabled Examples TRIG DEL AUTO ON Enables automatic trigger delay Query TRIG DEL AUTO Retrieves the state of the automatic trigger delay 0 OFF 1 ON SAMPIe COUNt lt value gt MINimum MAXimum Description Sets the number of measurements the Meter takes per trigger This setting is stored in volatile memory Parameters lt n gt 0 to 50 000 Number of measurements per trigger MINimum Number of measurements per trigger set to 1 MAXimum Number of measurements per trigger set to 50 000 Examples SAMP COUN 2450 Number of measurements per trigger set to 2 450 57 8845A 8846A Programmers Manual Query SAMP COUN Retrieves the number of samples per trigger presently set in the Meter SAMP COUN MIN Returns 1 to indicate the minimum number of samples the Meter will accept per trigger SAMP COUN MAX Returns 50 000 to indicate the maximum number of measurements the Meter will accept per trigger TRIGger COUNt lt n gt Description Sets the number of triggers the Meter will take before switching to an idle state This setting is stor
138. sent a single binary condition that is either true or false For a false condition the Meter will accept OFF or 0 For a true condition the Meter will accept ON or 1 When you query a boolean setting the instrument will always return 0 or 1 The following command uses a boolean parameter INPut IMPedance AUTO OFF ON String Parameters String parameters can contain virtually any set of ASCII characters A string must begin and end with matching quotes either with a single quote or with a double quote You can include the quote delimiter as part of the string by typing it twice without any characters in between The following command uses a string parameter DISPlay TEXT lt quoted string gt Alternate Programming Language Compatibility The Meter can be configured to accept and execute 8845 A 46A SCPI commands HP 34401 A compatible non SCPI compliant modes Fluke 8842A or Fluke 45 multimeter commands Remote operation will only allow you to access the functionality of the multimeter language selected Full Meter capability is available through the 8845 A 46A SCPI programming language For more information on selecting the alternate languages from the front panel menu see Selecting the Programming Language earlier in this manual From the remote interface use the following commands to select the alternate languages L1 selects SCPI language L2 selects Fluke 45A language L3 selects Fluke 8842A language The Meter impleme
139. seven digit serial number version of main software and version of display software example FLUKE 45 9080025 2 0 D2 0 Meter sets the Operation Complete bit in the Standard Event Status Register when parsed Meter places an ASCII 1 in the output queue when parsed Meter performs power up reset except that the state of IEEE 488 interface is unchanged including instrument address Status Byte and Event Status Register SRE lt value gt Service Request Enable Sets the Service Request Enable Register to lt value gt an integer between 0 and 255 The value of bit six is ignored because it is not used by the Service Request Enable Register Note that lt value gt is an integer whose binary equivalent corresponds to the state 1 or 0 of bits in the register If lt value gt is not between 0 and 255 an Execution Error is generated SRE Service Request Meter returns the lt value gt of the Service Request Enable Enable Que Register with bit six set to zero lt value gt is an integer whose Y binary equivalent corresponds to the state 1 or 0 of bits in the register STB Read Status Byte Meter returns the lt value gt of the Status Byte with bit six as the Master Summary bit lt value gt is an integer whose binary equivalent corresponds to the state 1 or 0 of bits in the register TRG Trigger Causes the meter to trigger a measurement when parsed WAI Wait to continue Command required
140. state either a TRG or bus GET command will trigger the Meter to take measurements Service Requests IEEE 488 Only and Status Registers Service requests let an instrument on the IEEE 488 bus get the attention of the host Service requests are sent over the service request SRQ bus line If more than one instrument on the bus is capable of sending service requests the host can determine which instrument made the request by taking a serial poll Each instrument on the bus responds to the poll by sending the contents of its Status Byte Register If an instrument on the bus has made a service request the request service bit RQS bit 6 of its Status Byte Register will be set to 1 identifying it as an instrument that requested service The contents of the Status Byte Register STB is determined by the Service Request Enable Register SRE Standard Event Status Register ESR Standard Event Status Enable Register ESE Questionable Data Event Register Questionable Data Enable Register and the output buffer These status registers are discussed below and summarized in Table 4 Figure 3 shows the relationship of these registers Table 4 Status Register Summary CE ster Standard Event Enable ESE pee EE Register Questionable Data STAT QUES EVEN None Questionable Data Event Register Enable Register Questionable Data STAT QUES ENAB STAT QUES ENAB None Enable Register lt value gt 23 8845A 8846A Programmers Manual Qu
141. t is one of the following lt signed integer gt lt signed real number without exponent gt lt signed real number gt E lt signed exponent gt Example Explanation N12001 Enters the five digit integer 12001 N 1 23E2 Enters 1 23 x 10 N 154 33E 1 Enters 1 5433 x 10 The N command enters numeric values for use with subsequent Put commands The interpretation of the numeric value depends on which Put command it is used with The E can be used within an N command for entering an exponent of 10 The N can be used without an E but an E requires a prior N The exponent can be any integer from 9 to 9 The mantissa may exceed 5 1 2 digits The 8842A accurately calculates the appropriate exponent and then disregards all but the first 5 1 2 digits of the mantissa However a syntax error will occur if the numeric entry overflows the input buffer Example Explanation N123456789 Enters 1 23456 x 10 Put Commands The Put commands PO and P1 set up the configuration of the Meter and its operating modes by entering putting information in the appropriate registers The put commands are described further in the following paragraphs PO Put Instrument Configuration Format Explanation N lt frst gt P0 Where lt frst gt is a four digit integer interpreted as arguments for the F R S and T commands Example Explanation N3120 PO Identical to F3 R1 S2 TO Selects 2 Wire kQ function 200Q range fast sample rate
142. t IP address of 129 196 136 131 This is a Class C network ID assigned to the Fluke Corporation so it is highly unlikely that it will overlap with a network ID in use at your company However if you want to attach a Meter to an existing network you should check with your Network Administrator before using the default IP address or assigning a new IP address to a Meter or PC If your network contains more than one subnet and you want to communicate with a Meter in another subnet you need to set the default gateway address in both the host PC and the Meter to the address of the local router The TCVIP stack will detect that the destination address for a packet is in a different subnet via the subnet mask and send the packet to the default gateway address where the router will route it to the proper subnet For example if you have three Meters and a single PC you could set the following IP addresses 8845 8846 Series 1 198 178 246 1 8845 8846 Series 2 198 178 246 2 8845 8846 Series 3 198 178 246 3 Host PC 198 178 246 101 This would place all three instruments and the PC in the same subnet net ID 198 178 246 During initial operation ofthe TCP IP software the IP section builds a table that contains the correspondence between the IP address and Ethernet address of each host This is done via the Address Resolution Protocol ARP To do this the IP software sends out a broadcast frame that every TCP IP host and router receives This
143. t a later time using the FETCh command With one exception the INITiate command stops the Meter from accepting any other remote commands until the Meter has completed both taking the measurement and storing the reading The exception occurs when the trigger source is set to BUS with the TRIGger SOURce command Under this condition the TRG command or the IEEE 488 Group Execute Trigger will be processed to start the measurement Using the FETCh Command To process readings from the Meter s internal memory to the output buffer send the Meter a FETCh command With readings in the output buffer a bus controller can then retrieve the readings over the bus 42 Digital Multimeter Supported SCPI Commands Using the SENSe Subsystem to Configure the Meter Setting Meter functions and function parameters are controlled through the SENSe subsystem of commands Both primary and secondary display functions are set using the FUNCtion commands The parameters of each Meter function are also controlled through this subsystem of commands SENSe FUNCtion 1 2 lt function gt Description Sets the Meter to the measurement function listed in the function parameter The function must be enclosed in quotes in the command string e g FUNC VOLT DC Parameters 1 2 Use 1 for primary display and 2 for secondary display lt function gt CAPacitance Capacitance CURRent AC AC current CURRent DC DC current VOLTage AC AC voltage VOLT
144. t resolution gt MIN MAX DEF DC Make a dc voltage measurement lt range gt MIN MAX DEF lt resolution gt MIN MAX DEF RATio Make a dc voltage ratio measurement Table 13 Measurement Configuration Command Summary SENSe FUNCtion 1 2 CAPacitance FUNCtion 1 2 CONTinuity FUNCtion 1 2 CURRent AC FUNCtion 1 2 CURRent DC FUNCtion 1 2 DIODe FUNCtion 1 2 FRESistance FUNCtion 1 2 FREQuency FUNCtion 1 2 PERiod FUNCtion 1 2 RESistance FUNCtion 1 2 TEMPerature FRTD FUNCtion 1 2 TEMPerature RTD FUNCtion 1 2 VOLTage DC FUNCtion 1 2 VOLTage AC FUNCtion 1 VOLTage RATio FUNCtion 1 2 FUNCtion2 None VOLTage AC BANDwidth 3 20 200 MINimum MAXimum BANDwidth RANGe lt range gt MINimum MAXimum AUTO OFF ON AUTO RANGe MINimum MAXimum RESolution lt resolution gt MINimum MAXimum RESolution MINimum MAXimum DC Path to Meter configuration Select capacitance function Select continuity function Select ac current function Select dc current function Select diode function Select 4 wire resistance function Select frequency function Select period function Select 2 wire resistance function Select 4 wire temperature function Select 2 wire temperature function Select dc voltage function Select ac voltage function Select dc voltage ratio function Retrieve present measurement function Turn of
145. t to the Meter it is internally converted to F1 The function setting can be read using the GO command As with the front panel commands selecting F6 automatically selects the 2000 mA range RS If the instrument is in range R8 commanding F5 automatically selects the 200 mA range R4 If the instrument is in R1 through R6 commanding F5 automatically selects the 2000 mA range RS If the Meter is in a resistance function F3 or F4 and in R6 selecting any other function automatically selects R5 If the Meter is in range R8 and F2 or F3 is commanded range R1 is selected Get Commands The Get commands get information from the Meter for the controller Each Get command loads the output buffer with an output string in the format shown in Figure 7 Status data the output from Get commands G0 G1 G3 G4 G5 G6 G7 and G8 is interpreted as shown in Table 30 The Get commands should not be confused with the interface message GET Group Execute Trigger 79 8845A 8846A Programmers Manual Output Data Type Format Numeric Data n nnnnnE nn suffix CR LF EO From trigger Examples 12 3456E 6 Measured value 12 3456E 6 Ohm Measured value 9 99999E 9 Overrange 2 200 000 counts 9 99999E 9 gt VDC Overrange 2 200 000 counts 1 0032E 21 Error Message Instrument Configuration Data nnnn CR LF EOI From GO G4 G5 G6 and G7 Example 1100 Default GO value SRQ Mask Data nn CR LF EOI From G1 Example
146. tance at 0 C to 120 ohms TEMP RTD RO Returns the set resistance at 0 C 45 8845A 8846A Programmers Manual SENSe TEMPerature TRANsducer lt subfunction gt TYPe lt n gt Description Sets the RTD type for the temperature function This setting is stored in volatile memory Parameters lt subfunction gt RTD 2 wire RTD FRTD 4 wire RTD lt n gt PT100 385 Sets the RTD type to PT100 385 RO to 1000 and Alpha to 0 00385055 PT100 392 Sets the RTD type to PT100 392 RO to 100Q and Alpha to 0 00391600 CUSTI Sets the RTD type to be set by RO and Alpha settings Examples TEMP RTD TYP PT100_385 Sets the RTD type to PT100 385 Query TEMP RTD TYP Returns 385 or CUSTOM SENSe TEMPerature T RANsducer lt subfunction gt ALPHa lt n gt Description Sets the alpha variable for the temperature function This setting is stored in volatile memory Parameters lt subfunction gt RTD 2 wire RTD FRTD 4 wire RTD lt n gt __ 00374 to 00393 Sets the alpha parameter Examples TEMP RTD ALPH 0 00392 Sets the alpha parameter to 0 00392 Query TEMP RTD ALPH Returns the alpha setting of the temperature function SENSe FREQuency APERature lt n gt Description Sets the gate time for the frequency function to the value specified by lt n gt This setting is stored in volatile memory Parameters lt n gt 0 01 Gate time of 10 ms 4 2 digits 0 1 default Gate time of 100 ms 5 digits 1 Gate time of 1 second
147. tate of the reading store setting DATA FEED Returns CALC or CAL Culate KMATh MMFactor lt value gt Description Parameters Examples Query Sets the value in the m register for the mx b calculation lt value gt 0 to 999 999999 CALC KMAT MMF 37 Sets m register to 37 CALC KMAT MMF Retrieves the m register value CALCulate KMATh MBFactor lt value gt Description Parameters Examples Query Sets the value in the b register for the mx b calculation lt value gt 0 to 999 999999 CALC KMAT MBF 37 Sets b register to 37 CALC KMAT MBF Retrieves the b register value CAL Culate KMATh MUNits lt name gt 3 characters using A through Z Description Parameters Examples Query Sets the units for the mx b calculation lt name gt A to ZZZ Up to three letters CALC KMAT MUN VOL Sets units to VOL CALC KMAT MUN Retrieves the set units value CALCulate KMATh STATe lt n gt Description Parameters Examples Query Enables or disables the mx b calculation lt n gt ONorl Enables mx b calculations OFF or 0 Disable mx b calculations CALC KMAT STAT ON Enables mx b calculations CALC KMAT STAT Retrieves the state of the mx b calculation 0 OFF 1 ON Programming the Trigger System The Meter is designed to provide extensive control over the triggering of a single measurement or series of measurements One tr
148. terminate a command string in place of a lt new line gt character A lt carriage return gt followed by a lt new line gt is also accepted Command string termination will always reset the current SCPI command path to the root level SCPI Parameter Types The SCPI language defines several different data formats to be used in program messages and response messages Numeric Parameters Commands that require numeric parameters will accept all commonly used decimal representations of numbers including optional signs decimal points and scientific notation Special values for numeric parameters like MINimum MAXimum and DEFault are also accepted You can also send engineering unit suffixes with numeric parameters e g M K or u If only specific numeric values are accepted the Meter will automatically round the input numeric parameters The following command uses a numeric parameter VOLTage DC RANGe lt range gt MINimum MAXimum Digital Multimeter Supported SCPI Commands Discrete Parameters Discrete parameters are used to program settings that have a limited number of values like BUS IMMediate EXTernal They have a short form and a long form just like command keywords You can mix upper and lower case letters Query responses will always return the short form in all upper case letters The following command uses discrete parameters TRIGger SOURce BUS IMMediate EXTernal Boolean Parameters Boolean parameters repre
149. tes the digital averaging filter to improve noise immunity for dc functions This setting is stored in volatile memory Parameters lt n gt OFFor0 Turns the digital averaging filter off ON or 1 Turns the digital averaging filter on Examples FILT DIG ON Turns the digital averaging filter on Query FILT DIG Returns the digital averaging filter setting 0 OFF and 1 ON SENSe VOL Tage DC FiLTer STATe lt n gt Description Activates or deactivates the 3 pole analog filter to improve noise immunity for de voltage functions This setting is stored in volatile memory Parameters lt n gt OFFor0 Turns the analog dc voltage filter off ON or 1 Turns the analog dc voltage filter on Examples VOLT FILT ON Turns the analog dc voltage filter on Query VOLT FILT Returns the analog dc voltage filter setting SENSe VOL Tage DC FILTer DiGital STATe lt n gt Description Activates or deactivates the digital averaging filter to improve noise immunity for de voltage functions This setting is stored in volatile memory Parameters lt n gt OFFor0 Turns the digital averaging filter off ON or 1 Turns the digital averaging filter on Examples VOLT FILT DIGON Turns the digital averaging filter on Query VOLT FILT DIG Returns the digital averaging filter setting 0 OFF and 1 ON SENSe CURRent DC FILTer STATe lt n gt Description Activates or deactivates the 3 pole analog filter to improve noise immunity
150. the measurement function MIN Smallest value acceptable MAX Largest value acceptable DEF 5 digits Digital Multimeter Supported SCPI Commands Note Issuing a MEASure command without specifying a function puts the Meter into volts dc and triggers a measurement You must specify a range to use a resolution parameter Example MEAS volt ac 10 Returns a measurement after configuring the Meter for volts ac and setting the range to the 10 volt range MEAS diod ON Sets diode function using low current and returns the diode measurement 9 90000000E 37 is the value returned for an open diode Notes 1 For ac measurements resolution is fixed at 6 2 digits The resolution parameter only affects the front panel display 2 For frequency measurements the multimeter uses one range for all inputs between 3 Hz and 300 kHz With no input signal applied frequency measurements return zero 3 For period measurements the multimeter uses one range for all inputs between 0 33 seconds and 3 3 usec With no input signal applied period measurements return zero 4 The range and resolution are fixed for temperature measurements However placing PT100 385 or PT100 392 into the range field will set the RTD type Placing CUST1 into the range field will cause the Meter to use the values set into the Ro and Alpha parameters 5 The range and resolution are fixed for diode test 10 Vdc range and 52 digits When set to ON the
151. ties of networks the protocols are built up of several layers that are isolated from each other by well described interfaces Usually the lowest layers of the protocol are implemented in hardware logic on the interface circuits used by the computers and other devices attached to the network wiring The Ethernet standard consists of a set of low level addressing and data transmission protocols that run on several different wiring schemes Computers on a network are commonly referred to as a host The Meter is a host in this context Devices that facilitate communication between different sections of a network are called by names that indicate their function for example routers bridges and repeaters Physical Layer Wiring Schemes Supported by the Meter 106 The Meter supports the most common wiring scheme used in Ethernet networks 10 100BaseT Unshielded Twisted Pair or UTP The 10 100BaseT wiring method uses two or four pairs of twisted wires This wiring method supports only two connections to any one run of wire To support more than two physical connections an active instrument called a hub must be used A hub is an active device that supports multiple 10 100BaseT connections The network host attached to each connection of the hub may communicate with every other host attached to the hub Hubs also may allow other types of cable connections such as 10Base2 and 10Bases fat coax This is done to allow a hub to communicate with othe
152. ting a math function that is not allowed after selecting an allowed math function will result in a Setting Conflict error Note Math must be enabled before writing to the zero null or dB measurement registers Table 19 Allowed Math Measurement Function Combinations 7 Toov nov oor nor aw aw rea rates cont vice rem cv ae no ves ro no vo no wo he he no fre fre _ cen ne ver ne no vo no wo he he no fe fe 51 8845A 8846A Programmers Manual CALCulate FUNCtion NULL DB DBM AVERage LIMit Description Selects one of five math functions This setting is stored in volatile memory Selecting a math function disables any math function which may have been set previously For the selected math function to take effect the CALCulate STATe must be ON Parameters lt n gt NULL Uses the present reading as an offset to zero the returned reading DB Selects the DB mode DBM Selects the dBm mode AVERage Selects the average mode LIMit Selects the Limit Testing mode Examples CALC FUNC DBM Selects the dBm mode Query CALC FUNC Returns the selected math function CAL Culate STATe lt n gt Description Activates or deactivates the math function selected with CALC FUNC command This setting is stored in volatile memory Parameters lt n gt ONorl Activates the math function set previously by CALC FUNC command OFF or 0 Deactivates the math function Examples CALC STAT ON Turns on the math fu
153. to storing readings taken with INITiate command Enables disables storing of INITiate readings Retrieves state of storing INITiate readings Set trigger system to wait for trigger Path to sample count Set number of samples per trigger Retrieve sample count Path to trigger control Set the number of triggers Meter will accept Retrieve the number of tiggers Meter will accept Set the delay between trigger and measurement Disable Enable automatic trigger delay Retrieve automatic trigger delay status Retreive present trigger delay value Set meter s trigger source Retrieve the meter s present trigger source All SCPI commands recognized by the Meter are listed in the following sections along with description and syntax rules 37 8845A 8846A Programmers Manual 38 Using the MEASure Command The MEASure command provides the quickest and simplest program method for getting the Meter to make a single measurement through remote control However MEASure does not provide control over all possible parameters associated with a measurement function With the exception of function range and resolution the MEASure command does not allow changing settings before the measurement is taken Instead the Meter uses predefined settings for each function See Table 18 and makes a measurement as soon as the command is received The measurement is immediately sent to the output buffer A MEASure command is the same as using a CONFigure
154. trieve the present RTD type 385 CUSTOM Path to 4 wire temperature measurement Set RTD alpha parameter Retrieve the present RTD alpha parameter Set integration time for selected function Retrieve integration time for selected function Set resistance at 0 C Retrieve present 0 C resistance setting Set the type of RTD Retrieve the present RTD type 385 CUSTOM Path to filter selection Path to analog filter Set analog filter off or on for de functions Retrieve the present analog filter setting Path to digital filter Activates or deactivates digital filter Retrieve the present digital filter setting Path to ac filter selection Set the ac input signal filter Retrieve the present ac filter setting Path to configuring the autozero mode Set the autozero mode Retrieve the present autozero mode Path to input impedance Path to input impedance configuration Disable enable auto input impedance select Retrieve auto input impedance mode Path to input terminal selection Retrieve input terminal selection front or rear Table 14 RS 232 Interface Command Summary SYSTem Path to RS 232 Interface commands LOCal Set Meter to local mode REMote Set Meter to remote mode for RS 232 operation RWLock Set Meter to remote mode lock out front panel 34 Digital Multimeter Supported SCPI Commands Table 15 Status Reporting Command Summary CLS ESE lt enable value gt ESE ESR OPC OPC PSC 0 1 PSC S
155. tting is stored in volatile memory lt value gt 0 to 120 of highest range MINimum Sets upper limit register to 120 of highest range of selected function MAXimum Sets upper limit register to 120 of highest range of selected function CALC LIM UPP 150 Sets upper limit register to 150 CALC LIM UPP Retrieves the upper limit register value CALC LIM UPP MIN Returns 120 of highest range of selected function CALC LIM UPP MAX Returns 120 of highest range of selected function DATA FEED RDG_STORE lt n gt Description Enables default or disables storing measurements in the Meter s internal memory when an INITiate command is executed When enabled 5 000 measurements are stored in the Meter s internal memory when executing an INITiate command Note The MEASure and CONFigure commands automatically enable the storing of measurements Disabling the storage of readings may be beneficial when performing statistics operations Minimum maximum and average values can be calculated without storing each measurement Note While readings are disabled attempting to transfer readings to the output buffer with a FETCh command will generate an error Parameters Example DATA FEED Description Query Digital Multimeter Supported SCPI Commands lt n gt CALCulate Enable the storing of measurements i Disable the storage of measurements DATA FEED RDG_STORE CALC Retrieves the s
156. ully programmable instrument that can be integrated into an automated instrumentation system For a PC with only USB ports Fluke makes a cable Fluke PN 2675479 that converts between USB and RS 232 ports Note The remote interface port and settings can be changed only through the Meter s front panel controls Enabling or selecting a port for remote operation is a separate process from setting the various parameters associated with a remote interface An interface does not have to be selected to set its parameters for example the baud rate of the RS 232 port can be set while the Meter has the LAN port enabled as the remote control port Optimizing System Speed for I O Operation Several factors affect the remote system speed of the 8845A 46A To make the fastest measurements it is best to store the measurements in internal memory before transferring across the I O bus This is particularly true if you want to collect a large number of samples per measurement Set up all of the parameters i e function range filters etc prior to taking the measurements Use the internal trigger Set the trigger delay to zero Turn off the display If operating with RS 232 use the fastest baud rate available One example of taking fast voltage readings is cls This clears all error prior to initiating readings conf volt dc 0 1 Set the DC range to manual and 100 mV volt de nple 0 02 Set the NPLC to faster reading rate 4 1 2 digits zero
157. um RESolution lt resolution gt MINimum MAXimum RESolution MINimum MAXimum TEMPerature RTD ALPHa lt alpha value gt Set integration time for selected function Retrieve integration time for selected function Set resistance measurement range Disable enable Autoranging Retrieve present autorange setting Retrieve the present range setting Set resolution for resistance measurement Retrieve resistance measurement resolution Path to 4 wire resistance measurement range Path to analog filter Set analog filter off or on Retrieve the present analog filter setting Path to digital filter Activates or deactivates digital filter Retrieve the present digital filter setting Set integration time for selected function Retrieve integration time for selected function Set resistance measurement range Disable enable Autoranging Retrieve present autorange setting Retrieve the present range setting Set resolution for resistance measurement Retrieve resistance measurement resolution Path to frequency measurement range Set aperture time for frequency function Retrieve aperture time for frequency function Path to frequency range configuration Set frequency measurement range Disable enable Autoranging Retrieve present autorange setting Retrieve the present range setting Path to period measurement range Set aperture time for period function Retrieve aperture time for period function Path to period range configuration Set period measurement rang
158. ummary Status MSS EXAMPLE EXPLANATION STB Reads the Status Byte Register Assume that 32 is returned Converting 32 to the binary 00100000 indicates that bit 5 Standard Event is set to 1 To determine the event status you would have to read the Standard Event Register in the same manner using the ESR command Digital Multimeter Service Requests IEEE 488 Only and Status Registers Table 7 Description of Bits in the Status Byte Register Not used Always set to 0 Not used Always set to 0 Not used Always set to 0 Questionable Data One or more of the enabled events in the Questionable Data Event Register have occurred To determine which Questionable Data events have occurred send the Meter STAT QUES EVEN to read the Questionable Data Event Register Message Available MAV Data is available in the output buffer Bit set to 1 when response to query placed in output buffer Bit cleared set to 0 when output terminator sent to host Standard Event Status ESB One or more of the enabled events in the Event Status Register have occurred To determine which events have occurred send the Meter ESR to read the Event Status Register Master Summary Status MSS Set to 1 if any enabled bit in the STB MSS register is set to 1 otherwise set to 0 Status of MSS bit returned by STB query command Request Service RQS Set to 1 if service requested from front panel or MSS set to 1 Status of bit returned by s
159. ummary us 11 Math command summary 12 MEASure command summary esse 13 Measurement configuration command summary eenenenennennennennennen 14 RS 232 interface command summary 15 Status reporting command SUMMArY 16 System Related command summary 17 Triggering command summary 18 Preset Conditions for the MEASure and CONFigure Commands 19 Allowed math measurement function Combinations 20 IEEE 488 2 Common Commands 21 Fluke 45 Function Commands and Queries nenennnnenneennnennnnn 22 Function Modifier Commands and Queries c cccccccccsseceessecessceeseeeessecesseeensees 23 Range and Measurement Rate Commands and Querie neennnennennen 24 Measurement Queries sssss finesse covecs KEANNA NNKO EINEN KANEN ESN 25 Compare Commands and Queries 26 Trigger Configuration Commands ss 27 Miscellaneous Commands and Queries ccccccscccsseceessecesscecsseeecseceessecesseeessees 28 RS 232 Remote Local Configuration Commands 4 29 Trigger TYPES arsenal E RER EET 30 8842A Get Commands uschteiesienieeteensnnininbke a aE SETE SES 31 Seral Poll Registers roenn e EEE AEA E AERES 32 Serial Poll Register Description 33 Execution Error Codes and Descriptions u ussesssesssennsensnnennnennnenenenn nn 34 Ethernet IEEE 488 Configu
160. unction is used with the RANGe AUTO function This setting is stored in volatile memory For the frequency and period functions the RANGe AUTO command refers to the signal s input voltage and not the range of the frequency or period measurement Also the word VOLTage must follow the function before the RANGe command See examples below Note Autorange thresholds are set for down range with readings lt 11 of range and up range with readings gt 120 of range Examples VOLT RANG AUTO ON Sets the Meter s dc volts to autorange CURR AC AUTO OFF Sets the Meter s ac amps to manual ranging FREQ VOLT RANG ON Sets the Meter s voltage input to autorange while making a frequency measurement Query Digital Multimeter Supported SCPI Commands VOLT RANG AUTO Returns the dc volts autorange state A zero means off and a one means on SENSe lt function gt RESolution lt n gt Description Parameters Examples Query Sets the resolution according to the value supplied for n for the Meter function specified in the variable lt function gt Resolution is specified in the same units as the function i e volts for the volts ac and dc functions This setting is stored in volatile memory For functions that do not have selectable ranges an error is returned when using frequency period temperature diode test or continuity as the function in the RESolution command lt n gt resolution value Desired resolution
161. unicate with each other a host computer and the Meter must use the same socket port number The default port is 3490 Typically the default port does not need to be changed If the socket port must be changed enter the Socket Port number supplied by your network administrator To change the Socket Port number 1 From the LAN Port setup menu press the FIRE soft key 2 Press the FORT soft key 15 8845A 8846A Programmers Manual 3 To select the digit to adjust press either lt or With the desired digit selected press the soft key labeled to decrement the digit or to increment the digit 4 Press the ENTER soft key The new Network Socket Port becomes effective immediately Note The Network Socket Port Number is stored in non volatile memory Establishing an Ethernet Connection 16 The easiest method of establishing an Ethernet connection with the Meter is through the commonly available program Telnet Telnet is a client server protocol based on TCP The Telnet Protocol provides a fairly general bi directional eight bit byte oriented communications facility Telnet is available on all UNIX servers and on most PCs Telnet clients typically connect to hosts on socket port 23 The LAN connection to the Meter must be established using the specified Network Socket Port See the Configuring the General Network Socket Port section above When the remote interface port is changed to LAN from the Meter s
162. up the remote interface for IEEE 488 Fluke 8842A emulation mode will not work over RS 232 or Ethernet 1 Press 2 Press FORT IF softkey 3 Press the SELECT FORT softkey 4 Press the EEE4 softkey Set the IEEE 488 address to a system compatible value as follows 1 Press 2 Press FORT IF softkey 10 Digital Multimeter Configuring the RS 232 Port 3 Press the TEEE 4 softkey 4 Use the softkeys to set the address as follows Select the address digit to adjust by pressing either 4 or With the desired digit selected press the soft key labeled to decrement the digit or to increment the character 5 With the desired address set press ENTER To set the Meter to Fluke 8842A emulation 1 Press este 2 Press the COMMANDS softkey 3 Press the 2 softkey 11 8845A 8846A Programmers Manual 8845A 8846A Cable Null Modem such as Fluke RS43 PC Not Used No Connect DCD DCD RxData RxData Nr Mn RxData RxData TxData TxData TxData TxData Not Used DTR DTR DTR GND GND GND GND Not Used DSR IL DSR DSR RTS RTS RTS RTS CTS CTS eeM COTS CTS Not Used No Connect RI RI Cable USB to RS 232 such as Fluke 884X USB 8845A 8846A Not Used No Connect RxData RxData TxData TxData Not Used DTR USB USB GND GND Adapter Interface Not Used DSR RTS RTS CTS CTS are
163. urns the digital averaging filter setting 0 OFF and 1 ON SENSe UNIT TEMPerature lt units gt Description Sets the temperature units for the temperature function This setting is stored in volatile memory Parameters lt units gt Cel Sets temperature units to Celsius Far Sets temperature units to Fahrenheit Kel Sets temperature units to Kelvin Examples UNIT TEMP C Sets temperature units to Celsius Query UNIT TEMP Returns the temperature units setting C Celsius F Fahrenheit and K Kelvin SENSe ZERO AUTO lt n gt Description Activates default or deactivates the autozero mode This setting is stored in volatile memory Parameters lt n gt OFF Turns Autozero mode off ON Turns autozero mode on ONCE Initiates a zero measurement immediately Examples ZERO AUTO ON Turns autozero mode on Query ZERO AUTO Returns the state of the autozero mode 0 OFF and 1 ON SENSe VOL Tage DC IMPedance AUTO lt n gt Description Activates or deactivates default the automatic input impedance mode for dc voltage measurements With AUTO OFF the input impedance is fixed at 10 MQ for all ranges With AUTO ON the input impedance is set to gt 10 GQ for the 100 mV 1 V and 10 V ranges This setting is stored in volatile memory Parameters lt n gt OFFor0 Turns off automatic input impedance ON or 1 Turns on automatic input impedance Examples VOLT IMP AUTO ON Turns on automatic input impedance Qu
164. uses the meter to exit autoranging on the primary display and enter manual ranging The present range becomes the selected range mode cannot be selected e g if dB or diode continuity test is selected an Execution Error is generated in the manual range mode the user selects a fixed range Table 23 Range and Measurement Rate Commands and Queries Command Description AUTO Causes the meter to enter the autoranging mode on the primary display If the autorange RANGE Sets the primary display to the range designated by lt range gt where lt range gt is a number lt range gt between 1 and 7 that corresponds to a range shown in Tables 5 12A and 5 12B Table 23A Ranges at Fast amp Medium Measurement Rate Range Voltage Ohms Current Frequency Value Range Range Range Range 1 300 mV 300 Q 30 mA 1000 Hz 2 3 V 3kQ 100 mA 10 kHz 3 30 V 30kQ 10A 100 kHz 4 300 V 300 k Q ERROR 1000 kHz 5 1000 V dc 3MQ ERROR 1 MHz 6 ERROR 30 MQ ERROR ERROR 7 ERROR 300 MQ ERROR ERROR 1000 V dc 750 V ac Table 23B Ranges at Slow Measurement Rate Range Voltage Ohms Current Frequency Value Range Range Range Range 1 100 mV 100 Q 10 mA 1000 Hz 2 1000 mV 1000 Q 100 mA 10 kHz 3 10 V 10kQ 10 A 100 kHz 4 100 V 100 k Q ERROR 1000 kHz 5 1000 V dc 1000 k Q ERROR 1 MHz 6 ERROR 10MQ ERROR ERROR 7 ERROR 100 MQ ERROR ERROR 1000 V dc 750 V ac Digital Multimeter FLUKE 45 Command Emulation Summary
165. ut buffer becomes full when the IEEE 488 interface is used the Meter stops accepting characters until there is room in the buffer Characters in the input buffer cannot be over written with the IEEE 488 interface Valid terminators for the RS 232 interface are e LF Line Feed e CR Carriage Return e CRLF Carriage Return Line Feed Valid terminators for the IEEE 488 interface are e EOI End or Identity on any character e LF Line Feed In some instances a terminator is automatically transmitted at the end of the host s output string 1 e the Meter s input string For example in Fluke BASIC the PRINT statement finishes with a CR LF pair 19 8845A 8846A Programmers Manual Typical IEEE 488 Input Strings Two typical strings that could be sent to the Meter over the IEEE 488 interface are shown in Figure 2 These strings are written in BASIC to be sent from an instrument controller or computer Sending Numeric Values to the Meter Numeric values can be sent to the Meter as integers real numbers or real numbers with exponents as shown in the following examples EXAMPLE EXPLANATION 12345689 Sends the signed integer 12345689 1 2345E2 Sends 1 2345 x 10 Sending Command Strings to the Meter Observe the following rules when you construct strings to be sent to the Meter over the computer interface e RULE 1 READ METER S OUTPUT BUFFER ONLY ONCE FOR EACH QUERY COMMAND The Meter s output buffer is cleared
166. ution specify it in the units of the function instead of number of digits For ac or dc volts specify the resolution in volts The resolution specification for frequency is in hertz Note range parameter is required when specifying the resolution parameter Using the READ Command READ Description READ causes the Meter to take a measurement the next time the trigger condition is met after the READ command is received After the measurement is taken the reading is placed in the output buffer The READ command will not cause readings to be stored in the Meter s internal memory All measurements are sent to the output buffer until the buffer becomes full at which point the Meter stops taking measurements To keep the measurements running measurements must be continually read out of the output buffer Note Always process the reading s from the output buffer after each READ command Failure to do so may cause some of the data from the previous READ command to appear in the response for the last READ command For those times the buffer cannot be read after a READ command send a device clear DC1 before issuing another READ command Using the INITiate Command Once the Meter has been configured for a measurement the INITiate command causes the Meter to take a measurement when the trigger conditions have been met The measurement reading s are placed in the Meter s internal memory up to 5 000 readings to be read a
167. voice Buyer for importation costs of repair replacement parts when product purchased in one country is submitted for repair in another country Fluke s warranty obligation is limited at Fluke s option to refund of the purchase price free of charge repair or replacement of a defective product which is returned to a Fluke authorized service center within the warranty period To obtain warranty service contact your nearest Fluke authorized service center to obtain return authorization information then send the product to that service center with a description of the difficulty postage and insurance prepaid FOB Destination Fluke assumes no risk for damage in transit Following warranty repair the product will be returned to Buyer transportation prepaid FOB Destination If Fluke determines that failure was caused by neglect misuse contamination alteration accident or abnormal condition of operation or handling including overvoltage failures caused by use outside the product s specified rating or normal wear and tear of mechanical components Fluke will provide an estimate of repair costs and obtain authorization before commencing the work Following repair the product will be returned to the Buyer transportation prepaid and the Buyer will be billed for the repair and return transportation charges FOB Shipping Point THIS WARRANTY IS BUYER S SOLE AND EXCLUSIVE REMEDY AND IS IN LIEU OF ALL OTHER WARRANTIES EXPRESS OR IMPLIED INCLUDI
168. volved past simple work groups into campus wide inter campus and even international interconnect schemes This makes it necessary to divide the network into segments know as subnets The IP address provides two pieces of information the network ID and the host ID The network ID must be unique among all network subnets within a connected Internet It identifies the network subnet to which a host is connected The host ID must be unique among hosts within a network subnet and identifies the host within the subnet Network subnets connected to the public Internet must obtain an official network ID from a registrar approved by the Internet Network Information Center http www internic net to preserve the unique network IDs within the Internet However if you never intend to connect to the public Internet you re free to select your own network IDs The IP address is a 32 bit numeric address written in four numbers separated by periods Each of these four numbers can have a value in the range 1 to 254 An IP address is written in the form w x y z For example 198 178 246 10 or C6 B2 F6 0A in hexadecimal is a valid IP address Table 38 lists the three commonly used classes of IP address assignments Table 38 IP Address Assignments Class w Value Available Available Subnets Hosts itoiz to 1to126 16777214 108 Digital Multimeter Network Primer The following are reserved addresses and may not be assigned to hosts
169. wer up and any device clear command DCL or SDC 85 8845A 8846A Programmers Manual Wn Terminator Commands The Terminator commands select what terminators the Meter appends to every output string The available terminators are Carriage Return CR Line Feed LF and End Or Identify EOI CR and LF are ASCII control codes sent over the data lines just like output data EOI is a uniline message which is sent simultaneously with the last character in the output string Normally each output string 1s terminated with CR followed by LF and EOI The terminator selection can be read using the G6 command The Meter defaults to WO on power up and any device clear command XO Clear Error Register Command The X0 command clears the error status register of the Meter After an X0 command is executed a G7 command Get Error Status would return 1000 no errors Note that the error status register is also cleared when any device clear command DCL or SDC is executed However X0 is useful for clearing the error status register without forcing a complete instrument clear as do the device clear commands Yn Suffix Commands The Suffix commands enable or disable a suffix which the Meter can append to all numeric data The suffix includes a comma an overrange indicator gt and a function indicator VDC VAC OHM IDC or IAC The suffix is illustrated in Figure 7 An example of suffixed data is given in the Numeric D

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