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TEK A6907, A6909 USER

1. 6 7 5 5 4 3 2 1 0 16 ESB 55 Figure 3 4 Status Byte Register SBR 3 33 Status and Events Table 3 10 SRB Bit Functions Bit Function 7 Not used 6 RQS Request Service MSS Master Status Summary When the instrument is accessed using the GPIB serial poll command this bit is called the Request Service RQS bit and indicates to the controller that a service request has occurred in other words that the GPIB bus SRQ line is LOW The RQS bit is cleared when serial poll ends When the instrument is accessed using the STB query this bit is called the Master Status Summary MSS bit and indicates that the instrument has issued a service request for one or more reasons The MSS bit is never cleared to 0 by the STB query 5 Event Status Bit ESB This bit indicates whether or not a new event has occurred after the previous Standard Event Status Register SESR has been cleared or after an event readout has been performed 4 Message Available Bit MAV This bit indicates that a message has been placed in the output queue and can be retrieved 3 0 Not used Standard Event Status The SESR is made up of 8 bits Each bit records the occurrence of a different Register SESR type of event as shown in Figure 3 5 and Table 3 11 7 6 5 4 3 2 1 0 PON URQ CME EXE DDE QYE RQC OPC Figure 3 5 The Standard Event
2. To CH2 OUTPUT On Rear Panel CH1 CH2 CH3 To CH3 OUTPUT On Rear Panel To CH4 OUTPUT On Rear Panel DC Calibration Generator 6 Inch Common Lead CH1 Probe Digital Multimeter Dual Banana Plug to BNC Adapter Coaxial Cable Figure 6 3 Negative DC Gain Test Setup A6907 amp A6909 User Manual 11 Set the generator output to 500 mV 12 Measure and record the multimeter reading as E in Table 6 2 13 Check that the DC gain is within the limits given in Table 4 1 on page 4 1 Compute Error as follows E Ej X 5 X Isolator Scale Generator Output Error x 100 For example using a test voltage of 49 5 V with an isolator scale of 10 V div and measured voltages E 496 mV and E 499 mV the Error would be 0 496 0 499 5 x 10 49 5 Error x 100 0 51 14 Repeat steps 5 through 13 using the CH1 VOLTS DIV and DC calibration generator settings as shown in Table 6 2 6 5 Performance Verification Table 6 2 Isolator Gain Accuracy Emm LU VOLTS DIV Setting Generator Voltage 200 mV 1V 500 mV 2 5V 1V 5V n 5V 25V 15 Repeat steps 1 through 14 for all channels 16 Disassemble the setup 6 6 A6907 amp A6909 User Manual Performance Verification Low Frequency Pulse Response
3. Figure 3 8 The Service Request Enable Register SRER A6907 amp A6909 User Manual Status and Events Queues A6907 amp A6909 User Manual Output Queue Event Queue There are two types of queues in the status reporting system used on the isolator output queues and event queues The output queue is a FIFO queue and holds response messages to queries where they await retrieval When there are messages in the queue the SBR MAV bit is set The output queue will be emptied each time a command or query is received so the controller must read the output queue before the next command or query is issued If this is not done an error will occur and the output queue will be emptied however the operation will proceed even if an error occurs The event queue is a FIFO queue and stores up to 10 events that have occurred on the instrument If more than 10 events occur event 10 will be replaced with event code 350 Queue Overflow To retrieve events set the ESR query to synchronize operations and then use the ALLEv EVENT or EVMsg queries to retrieve the events A detailed explanation of this process follows First issue an ESR query to read the contents of the SESR Reading the SESR contents will clear the SESR and simultaneously it will become possible to retrieve events from the event queue Then use one of the following queries to retrieve events m ALLEv Retrieves all retrievable events
4. 3 33 Figure 3 5 The Standard Event Status Register SESR 3 34 Figure 3 6 The Device Event Status Enable Register DESER 3 36 Figure 3 7 The Event Status Enable Register ESER 3 36 Figure 3 8 The Service Request Enable Register SRER 3 36 Figure 3 9 Status and Event Processing Sequence 3 38 Figure 4 1 Frequency Derating for the Maximum Normal Mode Voltage 4 3 Figure 4 2 Frequency Derating for the Maximum Common Mode Voltage 4 3 Figure 6 1 DC Offset and Gain Test Setup 6 3 Figure 6 2 Positive DC Gain Test Setup 6 4 Figure 6 3 Negative DC Gain Test Setup 6 5 Figure 6 4 Low Frequency Pulse Response Check Setup 6 7 Figure 6 5 Rise Time and Aberrations Check Setup 6 10 Figure 6 6 Bandwidth Check Setup 6 12 Figure 7 1 Electrical to Optical E O Isolator Adjustment Locations 7 3 A6907 amp A6909 User Manual iii Contents List of Tables Table 1 1 Optional Power Cords 1 3 Table 1 2 Isolator Error Codes 1 9 Table 2 1 Isolator Scale Factors 2 4 Table 3 1 GPIB Functions 3 9 Table 3 2 BNF Symb
5. CH4 DC AC VIDIV mV DIV VOLT DIV WITH OSCILLOSCOPE SET AT 100 mV DIV COUPLING aC C7 INPUT Q NORMAL MODE lt 800 Vrms COMMON MODE 800 Vrms 10MQ 45pF Figure 2 1 Isolator Front Panel A6907 amp A6909 User Manual 2 1 Functional Overview Isolator Front Panel Controls and Connections __ ON STBY CAL A C 2 ON STBY Pressing the ON STBY button toggles the isolator between the ON and STANDBY modes The POWER switch on the rear panel must be in the ON position in order to enable the ON STBY button See page 2 3 for more details CAL Pressing the CAL button starts a self calibration process The CAL process should be run before making any measurements Also the oscilloscope input should be set to 100 mV division for the output scale factor to be accurate See page 1 10 for a description of the self calibration process COUPLING C 2 COUPLING Pressing the COUPLING button toggles the isolator between DC and AC input coupling DC Coupling All frequency components included in the input signal are passed to the attenuator AC Coupling DC signal components are blocked The input signal first passes through a capacitor before being coupled to the attenuator The coupling status is shown on the left side of the channel display This button also provides manual adju
6. 1 8 A6907 amp A6909 User Manual Functional Check After line power is connected to the isolator perform a functional check to test normal system operation To ensure proper operation of your isolator follow these steps Turning On Power Set the POWER switch on the rear panel to the ON position This enables the STBY ON control on the front panel Press the STBY ON button on the front panel The isolator will automatically begin the self test procedure If the results of the self test are normal the channel display settings revert to the values that were effective when the power was last turned off If there is a self test error an error code will appear on all of the channel indicators See Table 1 2 Table 1 2 Isolator Error Codes Error Code Description E01 ROM checksum error E02 RAM read write error E03 EEPROM checksum error E04 EEPROM read write error If an error code is displayed contact your local Tektronix Field Office for assistance A6907 amp A6909 User Manual 1 9 Functional Check Self Calibration NOTE In order to ensure the accuracy of measurements self calibration should be performed just before taking measurements The A6907 and A6909 are equipped with a self calibration function that automatically calibrates the offset and gain for each channel for maximum accuracy After the isolator has been warmed up for 20 minutes use the following procedure to perform the self calibratio
7. Table 3 12 shows the messages for normal status when there are no events There are no corresponding SESR bits in this case Table 3 12 Normal Status Code Message 0 No events to report queue empty 1 No events to report new events pending ESR Table 3 13 shows the messages generated when there is a syntax error in the command Table 3 13 Command Errors Code Message 100 Command error 102 Syntax error 104 Data type error 108 Parameter not allowed Table 3 14 shows the messages generated when an error is detected while a command is being executed A6907 amp A6909 User Manual 3 39 Status and Events Table 3 14 Execution Errors Code Message 200 Execution error 222 Data out of range Table 3 15 shows the messages generated when an internal instrument error is detected When this type of error occurs it may be due to a hardware problem Table 3 15 Internal Errors Code Message 300 Device specific error 330 Self test failed 350 Queue overflow DDE bit is not set Table 3 16 shows the messages for system events This type of message is generated when the instrument changes to a certain status Table 3 16 System Events Code Message 401 Power on 402 Operation complete 410 Query INTERRUPTED 420 Query UNTERMINATED 440 Query UNTERMINATED after indefinite response Synchronizing Execution 3 40 Almost all GPIB commands are executed in the order in which they a
8. Getting Started Product Description The A6907 and A6909 High Voltage Isolators connect floating not referenced to ground signals to an oscilloscope or digitizer for measurement Optical couplers insulated transformers and plastic barriers are used for extremely high isolation between channels and the chassis and from channel to channel Signals measured between the tip and common connections of the special probes are fully isolated from ground and other channels The maximum rated voltage between the probe tip and probe common normal mode voltage is 850 V DC peak AC The maximum rated voltage between the probe common and chassis ground common mode voltage is also 850 V DC peak AC The electrical to optical E O converter isolates the signal and converts it to an optical analogue The optical to electrical O E converter demodulates the optical signal to an electrical signal whose common mode elements have been rejected The E O converter uses a unique low contact DC to DC converter as a power source to provide a high degree of isolation The A6907 and A6909 satisfy the UL1244 CSA 231 and IEC1010 1 safety standards for floating measurements The A6907 and A6909 have the following special features m DC to 60 MHz bandwidth m Self calibration function for accurate measurements m Portable configuration m Excellent linearity and low interference m External control through GPIB interface standard on the A6907 op
9. Syntax Each command requires at least a header Headers can be divided into six types A header made up of a single header mnemonic HEADER A header made up of a single header mnemonic plus a EVENT A header made up of several header mnemonics separated by Example CH1 COUPLING CH1 GAIN A header made up of several header mnemonics separated by colons with a question mark at the end Example CH1 OFFSET A header made up of a header mnemonic preceded by an NOTE Commands that include asterisks are those defined by IEEE Std 488 2 These commands can be used on all instruments with GPIB systems that support the IEEE Std 488 2 A header made up of a header mnemonic preceded by an asterisk with a question mark at the end Arguments are placed at the end of the header to specify the command function The isolator uses two types of arguments decimal data and character string data Decimal Data Three types of decimal data can be used NR1 NR2 and as specified in ANSI IEEE Std 488 2 1987 see Table 3 4 When any one of these three can be Header according to their configuration Table 3 3 Header Configuration Types Header Type Configuration Simple command header Example DESE Simple query header question mark Example ALLEV Compound command header colons Compound query header Common command header asterisk Example RST Common query header Example IDN Arguments
10. m The output queue messages have been cleared despite the fact that they have not been retrieved 1 Request Control RQC Indicates that the instrument has asked the controller to give up control over the bus Not used on the isolator 0 Operation Complete OPC This bit is set with the results of the execution of the OPC command It indicates that all pending operations have been completed There are three types of enable registers the Device Event Status Enable Register DESER the Event Status Enable Register ESER and the Service Request Enable Register SRER Each bit in these enable registers corresponds to a bit on the controlling status register By setting and resetting the bits in the enable register the user can determine whether or not events that occur will be registered to the status register and queue The DESER is made up of bits defined exactly the same as bits 0 through 7 in the SESR This register designates which events are registered to the SESR and event queue and which are ignored In order to set events to the SESR and the event queue the DESER bits corresponding to those events are set When events are to be ignored the SESR bits corresponding to those events are reset Use the DESE command to set the bits of the DESER Use the DESE query to read the contents of the DESER 3 35 Status and Events Event Status Enable Register ESER Service Request Enable Register SRER 3 36 7
11. Flatness Check Required Equipment Setup A6907 amp A6909 User Manual m Oscilloscope m 50 Q Coaxial Cable Calibration Generator m BNC to Terminal Adapter 1 Assemble the test setup as shown in Figure 6 4 Calibration Generator Test Oscilloscope STD Output Dual Banana Terminals OOF to BNC Adapter ol CH1 Probe 6 Inch Common Lead Coaxial Cable To 1 OUTPUT Connector On Rear Panel isolator CH2 CH3 O Or Figure 6 4 Low Frequency Pulse Response Check Setup 2 Configure the oscilloscope Acquisition Mode Sample Record Length 1000 points Horizontal Scale 200 us div Vertical Scale 100 mV div Vertical Offset 0 Vertical Coupling DC Input Impedance 50 Q Bandwidth Limit 100 MHz 6 7 Performance Verification 6 8 Procedure 10 11 12 13 14 15 16 17 18 19 20 Connect CH1 probe tip of the isolator to the generator output Set the output of the generator for a high amplitude with a 1 ms period Connect the CH1 OUTPUT control on the isolator to the vertical input of the oscilloscope Set the CH1 VOLTS DIV control on the isolator to 1 V Adjust the AMPLITUDE control on the generator for five divisions of display on the oscilloscope Check that the flatness is within the tolerance given in Table 4 1 on page 4 1 Set the CHI VOLT
12. LRN Queries setting data RST Initializes instrument SET Queries setting data VERBose Control header in response message 3 19 Command Groups 3 20 A6907 amp A6909 User Manual Commands ALLEv CAL A6907 amp A6909 User Manual Syntax Returns Syntax Returns This section defines and discusses each command in detail This query retrieves the event messages corresponding to all of the event codes in the event queue For more information on event codes and event messages see Messages on page 3 39 ALLEv The following is a sample response to ALLEv ALLEV 100 Command Error 200 Execution Error This query executes self calibration and returns the result CAL lt NR1 gt Here lt NR1 gt is one of the following 0 Self calibration was completed without error 100 An error was detected in the channel 1 offset calibration 110 An error was detected in the channel 1 gain calibration 200 An error was detected in the channel 2 offset calibration 210 An error was detected in the channel 2 gain calibration 300 An error was detected in the channel 3 offset calibration 310 An error was detected in the channel 3 gain calibration 400 An error was detected in the channel 4 offset calibration 410 An error was detected in the channel 4 gain calibration 3 21 Commands CH lt x gt Syntax Returns CH lt x gt CAL Syntax Returns CH lt x gt CO
13. Performance Verification Rise Time and Aberration Check Required Equipment m Oscilloscope m 50 Q Coaxial Cable m 50 Q Feedthrough Termination m Calibration Generator m BNC to Terminal Adapter Setup 1 Assemble the test setup as shown in Figure 6 5 Calibration Generator Fast Rise Output Test Oscilloscope 50Q Termination Dual Banana Terminals to BNC Adapter CH1 Probe Co nm fl Coaxial Cable To CH1 OUTPUT Connector isolator On Rear Panel 6 Inch Common Lead CH2 CH3 CH4 O Figure 6 5 Rise Time and Aberrations Check Setup 6 10 A6907 amp A6909 User Manual Performance Verification Procedure A6907 amp A6909 User Manual 2 10 11 12 13 14 15 Set up the oscilloscope as follows Acquisition Mode Average 32 Record Length 1000 points Horizontal Scale 10 ns div Vertical Scale 100 mV div Vertical Offset 0 Vertical Coupling DC Input Impedance 50 Q Bandwidth Limit Full Measurement Rise Time Connect the isolator CH1 probe tip to the generator FAST RISE output Set the generator for a fast rise signal with a 10 us period Connect the CH1 OUTPUT of the isolator to the vertical input of the oscilloscope Set the CH1 VOLTS DIV control on the isolator to 100 mV Adjust the AMPLITUDE control on the generator for five divisions of display on the oscillosco
14. The UNL message releases all instruments on the bus from their addressed listener status The UNT message releases all instruments on the bus from their addressed talker status When an IFC message is received the instrument status becomes the same as if both UNL and UNT messages had been received A6907 amp A6909 User Manual GPIB Programming Remote Local and Lockout LOCAL REMOTE LOCKOUT A6907 amp A6909 User Manual The instrument is normally set to one of the following three control conditions When the power to the instrument is turned on it is placed in LOCAL control In LOCAL the isolator is operated using the keys on the front panel When an MLA message is received in LOCAL the control changes to REMOTE In REMOTE the isolator can be controlled using programs from a controller When a command is given using the front panel controls while in REMOTE the instrument control will change to LOCAL The isolator control changes to REMOTE LOCKOUT or LOCAL LOCKOUT status when the ATN line is true and an LLO message is received In LOCAL LOCKOUT control the instrument is operated using the controls on the front panel the same as in LOCAL control At this time if the REN and ATN lines are both true the receipt of an MLA message will change control to REMOTE LOCKOUT instead of REMOTE Front panel control of the isolator is not possible in REMOTE LOCKOUT control Also it is not possible to use the front panel cont
15. atmosphere Product Damage Precautions Use Proper Power Source Do Not Operate With Suspected Failures A6907 amp A6909 User Manual Do not operate this product from a power source that applies more than the voltage specified If you suspect there is damage to this product have it inspected by qualified service personnel General Safety Summary Safety Terms and Symbols Terms in This Manual These terms may appear in this manual WARNING Warning statements identify conditions or practices that could result in injury or loss of life CAUTION Caution statements identify conditions or practices that could result in damage to this product or other property Terms the Product These terms may appear on the product DANGER indicates an injury hazard immediately accessible as you read the marking WARNING indicates an injury hazard not immediately accessible as you read the marking CAUTION indicates a hazard to property including the product Symbols on the Product The following symbols may appear on the product 4 m DANGER Protective Ground ATTENTION Double High Voltage Earth Terminal Refer to Insulated Manual Certifications and Compliances CSA Certified Power CSA Certification includes the products and power cords appropriate for use in Cords the North America power network All other power cords supplied are approved for the country of use vi A6907 amp A6909 User Manual
16. 6 5 4 3 2 1 0 PON URQ CME EXE DDE QYE RQC OPC Figure 3 6 The Device Event Status Enable Register DESER The ESER is made up of bits defined exactly the same as bits 0 through 7 in the SESR This register is used by the user to designate whether the SBR ESB bit should be set when an event has occurred and whether the corresponding SESR bit has been set To set the SBR ESB bit when the SESR bit has been set set the ESER bit corresponding to that event To prevent the ESB bit from being set reset the ESER bit corresponding to that event Use the ESE command to set the bits of the ESER Use the ESE query to read the contents of the ESER 7 6 5 4 3 2 1 0 PON URQ CME EXE DDE QYE RQC OPC Figure 3 7 The Event Status Enable Register ESER The SRER controls bit 6 of the SBR Setting this register causes the SBR RQS bit to be set when the corresponding SBR bit is set generating a service request SRQ The generation of a service request involves changing the SRQ line to LOW and making a service request to the controller The result is that a status byte for which an RQS has been set is returned in response to serial polling by the controller Use the SRE command to set the bits of the SRER Use the SRE query to read the contents of the SRER Bit 6 must normally be set to 0 7 6 5 4 3 2 1 0 ESB MAV
17. Isolator Scale Factor The voltage scale factor displayed on the front panel of the isolator is valid only when the oscilloscope is set to 100 mV division If you must set the oscilloscope at other than 100 mV division refer to Table 2 1 to calculate the new scale factor NOTE The performance characteristics of the isolator are not warranted if the oscilloscope is not set to 100 mV division Table 2 1 Isolator Scale Factors Oscilloscope Setting 100 mV 200 mV 500 mV Isolator Scale Multiplier x1 x2 x5 1V x10 2V x20 5V x50 10V x100 20V x 200 50V x 500 100 V x 1000 200 V x 2000 For example if the isolator is set at 20 Volts division and the oscilloscope is set at 1 Volt division scale multiplier 2 10 the displayed waveform will be at 200 Volts division 20 x 10 200 2 4 A6907 amp A6909 User Manual Special Probes The isolator is supplied with special voltage probes for immediate use An optional current probe may be ordered for current measurements WARNING Do not use a special probe if the probe head or leads are damaged It may present an electrical safety hazard resulting in injury or death Voltage Probe The special voltage probe is provided with the following accessories retractable hook tip IC lead protection shroud probe common leads and cable marker rings see Figure 2 3 NOTE The probe included with the
18. Panel Figure 2 2 Isolator Rear Panel Isolator Rear Panel Controls and Connections OT A6907 amp A6909 User Manual INPUT POWER The input power connection provides a connection for the power cord and contains the input power fuse For a list of the available power cords refer to the Options section on page 1 3 POWER ON OFF This is the main power switch for the instrument It must be set to the ON position to enable the STANDBY ON key on the front panel OUTPUT Each channel in the isolator has a 50 output BNC connection In order for the isolator to successfully complete the self calibration all of the channels must each be terminated into a 50 load If the error code EO6 appears after self calibration it may be because the channel is not terminated into a 50 load If your oscilloscope does not provide a 50 input termination a 50Q feedthrough termination may be ordered as an optional accessory Also the oscilloscope input should be set to 100 mV division for the output scale factor to be accurate IEEE 488 2 STD PORT This is a General Purpose Interface Buss GPIB connector The GPIB function is standard on the A6907 and may be ordered as option 10 with the A6909 For more information on GPIB operation refer to the GPIB Programming section starting on page 3 7 2 3 Functional Overview
19. Performance Verification 13 Check that the output frequency of the generator is greater than the value given in Table 4 1 on page 4 1 14 Repeat steps 1 through 13 for all channels 15 Disassemble the test setup 6 14 A6907 amp A6909 User Manual Performance Verification Table 6 3 Isolator Test Qualification Record Test Offset Voltage CH4 DC Gain Error 100 mV 200 mV 500 mV 1V 2V 5V 10V 20V 50V Low Frequency Pulse Response 1Vat 1 kHz 10 V at 1 kHz 50 V at 1 kHz 1Vat 10 kHz 10 V at 10 kHz 50 V at 10 kHz Rise Time 100 mV 500 mV Aberrations 100 mV 500 mV Bandwidth 100 mV 500 mV A6907 amp A6909 User Manual 6 15 Performance Verification 6 16 A6907 amp A6909 User Manual
20. SCALE 100 0E 3 COUPLING DC OFFSET 132 GAIN 115 CH2 SCALE 200 0E 3 COUPLING DC OFFSET 121 GAIN 104 CH3 SCALE 500 0E 3 COUPLING AC OFFSET 137 GAIN 134 CH4 SCALE 100 0E 3 COUPLING DC OFFSET 135 GAIN 129 HEADER 1 VERBOSE 1 The SRE command sets the bit of the Service Request Enable Register SRER used by the status event reporting system However SRER bit 6 is always set to 0 The SRE query returns the contents of the SRER For more information on the SRER see page 3 36 SRE NRI SRE lt gt can be set to a decimal value between 0 and 255 The corresponding binary value is set for SRER When the power to the instrument is turned on all bits in SRER are reset 3 29 Commands STB TST VERBose 3 30 Examples Syntax Examples Syntax Returns In the following example SRER will be set to 48 00110000 In this example the ESB and bits are set SRE 48 The following is a sample response to the query SRE In this example ESER is set to 00100000 32 This query returns the contents of the Status Byte Register SBR used by the status event reporting system The SBR bit 6 is interpreted as the MSS Master Status Summary bit For more information on the SBR see page 3 33 STB The following is a sample response to the query STB In this example SBR is set to 01100000 96 This query executes self test and returns the result TST NRI Here N
21. Status Register SESR Table 3 11 SESR Bit Functions Bit Function 7 Power On PON Indicates that the power to the instrument is on 6 User Request URQ Indicates that the instrument has generated an event requesting something from the user or that a cautionary event has occurred This bit is not used on the isolator 5 Command Error CME Indicates that a command error has occurred while parsing by the command parser was in progress 3 34 A6907 amp A6909 User Manual Status and Events Enable Registers Device Event Status Enable Register DESER A6907 amp A6909 User Manual Table 3 11 SESR Bit Functions Cont Bit Function 4 Execution Error EXE Indicates that an error occurred during the execution of a command Execution errors occur for one of the following reasons m When a value designated in the argument is outside the allowable range of the instrument or is in conflict with the capabilities of the instrument When the command could not be executed properly because the conditions for execution differed from those essentially required 3 Device Specific Error DDE An instrument error has been detected 2 Query Error QYE Indicates that a query error has been detected by the output queue controller Query errors occur for one of the following reasons m An attempt was made to retrieve messages from the output queue despite the fact that the output queue is empty or in pending status
22. a detailed description of their definitions and operation 3 1 Reference Notes Status and Events This section lists detailed information on the processor registers for the advanced user or programmer 3 2 A6907 amp A6909 User Manual Manual Adjustments The self calibration process ensures a high degree of accuracy for offset and gain values however the isolator also has a function for manual fine adjustment of offset and gain values This function may be used to eliminate an offset included in the input signal or to match the amplitude to that of a reference signal Adjusting Offset Values Follow this procedure to change the channel offset value 1 Adjusting Gain Values Press the COUPLING and down SCALE buttons simultaneously for the channel to which you wish to apply an offset value The mode changes to the offset adjustment mode and an offset value 55 to 255 appears on the indicator Use the up and down SCALE buttons to set the offset value Once again press the COUPLING and down SCALE buttons simulta neously The channel reverts to the normal operating mode Follow this procedure to change the channel gain value 1 Press the COUPLING and up SCALE buttons simultaneously for the channel whose gain you wish to adjust The mode will change to the gain adjustment mode and a gain value 55 to 255 appears on the indicator Use the up and down SCALE buttons to set the gain value Once again press th
23. converter and demodulates it into an electrical signal Control and Calibration 5 2 The front panel provides control and display for each channel The front panel microprocessor controls the power on sequence as well as calibration and operation The front panel also supports a GPIB processor if installed The front panel assembly receives power from the A50 assembly 5 V from the lithium battery is provided for memory backup power as well as 15 V and 5 V for processor operation Signals controlling the attenuator range input coupling and calibration are isolated by an optical isolator located in the E O converter Calibration references are derived from the power supplies on the E O converter module When the CAL button is pressed the system balances and calibrates the gain of each channel by applying an appropriate voltage to the input of the attenuator and by measuring the output of the O E converter This eliminates any drift in the LED photodetector or amplifier in each channel A6907 amp A6909 User Manual SSS Performance Verification Performance Verification Prerequisites A6907 amp A6909 User Manual This section contains procedures for checking that the isolator performs as warranted NOTE Table 6 3 on page 6 15 is provided as a blank qualification test record Copy the table and use it to record the performance verification results To ensure the validity of these performance check
24. form and fit of the isolators Table 4 3 Mechanical Characteristics Weight 6 4 kg Dimensions Height with feet 120 mm Width 327 mm Depth 450 mm Environmental Characteristics Table 4 4 lists guaranteed operating and storage conditions for the isolators Table 4 4 Environmental Characteristics Temperature Operating 0 Cto 50 C Non operating 25 C to 70 C Humidity Operating and Non operating Stored at 95 to 97 relative humidity for five cycles 120 hours from 30 C to 50 C Altitude Operating To 4 5 km 15 000 feet Non operating To 15 km 50 000 feet Vibration Operating 0 31 g pus from 5 to 500 Hz 10 minutes each axis Non operating 2 46 g pus from 5 to 500 Hz 10 minutes each axis Shock Non operating 50 g half sine 11 ms duration three shocks on each face for a total of 18 shocks Packaged Product Vibration and Shock Meets Tektronix Std 062 2858 00 Rev B 4 4 A6907 amp A6909 User Manual Specifications Certifications and Compliances Table 4 5 Certifications and Compliances EC Declaration of Conformity EMC Meets intent of Directive 89 336 EEC for Electromagnetic Compatibility Compliance was demonstrated to the following specifications as listed in the Official Journal of the European Communities EN 50081 1 Emissions EN 55011 Class A Radiated and Conducted Emissions EN 50082 1 Immunity IEC 801 2 Electrostatic Discharge Immunity IEC 801 3 RF Electromagnetic F
25. isolator as a standard accessory is intended for use with the isolator only The balun on the cable provides shielding from large fields Do not use the special probe with other instruments Cable Marker 9 Aa Probe Common Leads Retractable Hook Tip P Probe Head SS AN T gt we zs IC Test Tip Figure 2 3 Special Voltage Probe and Accessories A6907 amp A6909 User Manual 2 5 Special Probes Use the sharp tip of the probe to make contact with terminals covered with solder resist or oxide Handle the probe carefully to prevent damage to other objects or personal injury Use the retractable hook tip to connect the probe to the circuit typically a component lead or test point connection for hands free measurements NOTE When removing the hook tip from the probe the probe may come loose from the probe cable If this happens the signals will not be passed from the probe to the isolator When reconnecting the probe to the probe cable make sure that the cable is securely inserted into the probe When probing ICs remove the retractable hook tip from the probe and attach the IC test tip to the tip of the probe The tip of the probe will stick out from the IC test tip but the probe tip will not come in contact with and short out an adjacent IC lead Connect the common lead to the reference point in the circuit Because of the high capacitance of the common lead circuit do not connect the common l
26. outside of the isolator are connected to the power source ground by means of the ground wire in the power cord and plug WARNING In order to prevent electrical shock do not substitute any other style of probe for the special probes provided with the isolator The provided probes are specially insulated for high voltage measurements Do not make connections to a circuit before connecting the probe to the isolator Firmly push the probe connector into the channel input on the front panel of the isolator Refer to Figure 1 1 For information on probe accessories and probing techniques refer to the Special Probe section starting on page 2 5 Connecting Output Cables 1 6 Use the 50 Q BNC cables included with the instrument to connect the isolator to an oscilloscope or digitizer Refer to Figure 1 1 NOTE The input impedance of the connected oscilloscope must be 500 If your oscilloscope does not provide a 50 2 termination attach an optional 502 feedthrough termination between the BNC cable and the oscilloscope input connector Unterminated channels will report the error code E06 during self calibration A6907 amp A6909 User Manual Installation A6907 amp A6909 User Manual Test Oscilloscope Coaxial Cable Isolator To CH1 OUTPUT Connector Figure 1 1 Isolator Setup Set the oscilloscope input attenuators to 100 mV division 1 7 Installation
27. sure that the power cord is firmly connected to a grounded outlet before connecting the probe of the isolator to the circuit to be measured Maximum Common Mode Slew Rate Special Probe A6907 amp A6909 User Manual The maximum common mode slew rate indicates how fast a common mode input the instrument can withstand This characteristic is sometimes called the non destructive V q On the A6907 and A6909 this value is 20 kV us Therefore the instrument can tolerate a common mode input signal with a slew rate less than this value The special standard probe features extra insulation to ensure safety when working with high voltages and a balun to suppress the effects of large dV a changes in the operating area Touching the probe when high frequency high voltage is applied to the common lead will cause high frequency current to flow by capacitive coupling to the person holding the probe Although this capacitive current will not cause a 3 5 Floating Measurements physical shock it is important to know the limits of the insulation Please refer to figures 4 1 and 4 2 on page 4 3 for derating information Common Lead Connections Although the isolator is insulated from ground the common lead has 80 pF of capacitance to ground Connect the common lead to low impedance sections of a circuit to minimize the effects of capacitive loading CAUTION To prevent damage to equipment do not connect the common lead
28. to high impedance sections of a circuit The additional capacitance may cause circuit damage Connect the common lead to low impedance sections only Common Mode Rejection Ratio CMRR The common mode rejection ratio CMRR indicates the quality of the floating measurement This characteristic is typically expressed as a value in dB or as a ratio The CMRR indicates the amplitude of the resulting error signal generated by a signal that has been applied in the common mode On the A6907 and A6909 a CMRR value at 1 MHz is 55 dB 560 1 For example when a sine wave signal of 1 MHz at 100 Vp p is applied as a common mode input a differential error signal of 180 mV p p or less will be generated when the isolator range is set to 100 mV div Probe Probe Tip Tip e T e 4 Al Common al Lead TS 80 pF Lead Tr 80 pF Normal Mode Common Mode Figure 3 1 Normal and Common Mode Simplified Circuits 3 6 A6907 amp A6909 User Manual GPIB Programming A6907 amp A6909 User Manual You can use a computer to control the A6907 isolator and make measurements You can also control the A6909 with option 10 installed With an oscilloscope that also can be programmed the computer and isolator can form a complete automated measurement system Your computer also known as the controller must be capable of operating on a GPIB bus that confor
29. used it is noted as NRf 3 14 A6907 amp A6909 User Manual Syntax Character String Data Delimiters Short Form A6907 amp A6909 User Manual Table 3 4 Numeric Expressions Type Format Example NR1 Integer 1 3 2 10 20 NR2 Fixed Decimal Point 1 2 423 5 0 15 NR3 Floating Decimal Point 1E 2 3 36E 2 1 02E 3 Character string data is also called literal or string data Character strings are enclosed in quotation marks character string gt Example This is string constant When the character string has quotation marks add one more quotation mark to each quotation mark as shown below Example To make the phrase Serial Number J310000 into a character string enter the following Serial Number J310000 The grammatical elements making up program message units are delimited differentiated with colons semicolons white spaces and commas m Colon Used to join the header mnemonics in a compound command header m White Space Used to delimit the header and argument Normally the space character ASCII code 32 is used as the white space but ASCII code characters 0 to 9 and 11 to 31 can be used as well m Comma Used to separate arguments when there is more than one argument in a single header m Semicolon Used to link multiple commands See the Linking Com mands item In order to make it easier to create programs and reduce the time required for
30. 4 m E OI BR are ee Be fon ee ee 5 1 SIENA vdd E e EL IDEST GE SIS E a 5 2 Control and Calibration 4 5 2 Performance Verification Prerequisites 1355440884 8 eed Shee eke ee E Res 6 1 Required Equipment 6 2 Offsetand Gam Check i ay wR ea EU RES 6 3 Low Frequency Pulse Response Flatness Check 6 7 Rise Time and Aberration Check 6 10 Bandwidth Check ss wii ab ela ees PRU an 6 12 A6907 amp A6909 User Manual Contents List of Figures Figure 1 1 Isolator Setup 1 7 Figure 2 1 Isolator Front Panel 2 1 Figure 2 2 Isolator Rear Panel 2 3 Figure 2 3 Special Voltage Probe and Accessories 2 5 Figure 2 4 Waveform Distortion from Common Lead Length 2 7 Figure 2 5 Common Lead Equivalent Circuit 2 7 Figure 2 6 A620 Current Probe 2 8 Figure 3 1 Normal and Common Mode Simplified Circuits 3 6 Figure 3 2 Typical Stacked GPIB Connectors 3 7 Figure 3 3 Typical GPIB Network Configurations 3 8 Figure 3 4 The Status Byte Register SBR
31. ON URQ CME EXE DDE QYE RQC OPC Byte m i ueue Write using ESE H Byte Byte Y P Status Byte Regist 6 Y atus Byte Register SBR 7 RQS 5 4 3 2 1 0 Read using STB 6 ESB MAV Cannot be written MSS D Service Request Enable Register SRER 7 6 5 4 3 2 1 0 Read using SRE ESB MAV Write using SRE 5 T Figure 3 9 Status and Event Processing Sequence When an event occurs first of all the contents of the DESER are investigated If a DESER bit corresponding to an event has been set the SESR bit corresponding to that event is set as well and the event is placed in the event queue Likewise if a bit corresponding to that event in the ESER has been set the SBR ESB bit is set as well When a message has been sent to the output queue the SBR MAV bit is set 3 38 A6907 amp A6909 User Manual Status and Events When one of the bits in the SBR and the corresponding SRER bit has been set the SBR MSS bit is set and a service request is generated Messages Tables 3 12 through 3 16 show the codes and messages used in the status and event reporting system on the isolator Event codes and messages can be obtained by using the queries EVMsg and ALLEv These are returned in the following format event code gt lt event message gt The EVENT query returns only the event code When using these commands you will need to synchronize their operation with the ESR query
32. R 1 is one of the following 0 Self calibration was completed without error 100 A ROM checksum error has been detected 200 A RAM read write error has been detected 300 A EPROM read write error has been detected The VERBose command determines whether or not the shortened form of the header is included in the response to a query A6907 amp A6909 User Manual Commands Syntax Arguments Examples WAI Syntax Examples A6907 amp A6909 User Manual VERBose Ol1IOFFION VERBose 0 or OFF Shortened form of the header is used 1 or ON Complete form of the header is used In the following example the complete unshortened form of the header is designated for the response to a query VERBOSE ON The following is a sample response to the VERBOSE query VERBOSE 1 In this example the complete unshortened form of the header is used in the response to a query This command stops the execution of other commands and queries until all pending operations have been completed WAI The WAI command can be used to synchronize instrument operation and application programs For the method used to accomplish this see Synchronizing Execution on page 3 40 3 31 Commands 3 32 A6907 amp A6909 User Manual Status and Events Registers Status Registers Status Byte Register SBR A6907 amp A6909 User Manual The GPIB interface on the isolator includes a status and
33. S DIV control on the isolator to 10 V Adjust the AMPLITUDE control on the generator for five divisions of display on the oscilloscope Check that the flatness is within the tolerance given in Table 4 1 on page 4 1 Set the CH1 VOLTS DIV control on the isolator to 50 V Set the generator for a standard amplitude mode output of 100 V Check that the flatness is within the tolerance given in Table 4 1 on page 4 1 Set the generator for a high amplitude output with a 0 1 ms period Connect the CH1 OUTPUT control on the isolator to the vertical input of the oscilloscope Set the CH1 VOLTS DIV control on the isolator to 1 V Adjust the AMPLITUDE control on the generator for five divisions of display on the oscilloscope Check that the flatness is within the tolerance given in Table 4 1 on page 4 1 Set the CHI VOLTS DIV control on the isolator to 10 V Adjust the AMPLITUDE control on the generator for five divisions of display on the oscilloscope Check that the flatness is within the tolerance given in Table 4 1 on page 4 1 A6907 amp A6909 User Manual Performance Verification 21 Set the CH1 VOLTS DIV control on the isolator to 50 V 22 Set the generator for a standard amplitude mode output of 100 V 23 Check that the flatness is within the tolerance given in Table 4 1 on page 4 1 24 Repeat steps 1 through 23 for all channels 25 Disassemble the test setup A6907 amp A6909 User Manual 6 9
34. SER used by the status event reporting system The DESE query returns the contents of the DESER value See page 3 35 for more information on the DESER DESE NRI DESE lt NRI gt can be set to a decimal value between 0 and 255 The corresponding binary value is set for DESER When the power to the instrument is turned on all bits in DESER are set In the following example DESER will be set to 177 10110001 In such cases each of the bits PON CME EXE and OPC will be set DESE 177 The following is a sample response to the query DESE In this example DESER is set to 10110000 DESE 176 A6907 amp A6909 User Manual Commands ESE 2 Syntax Arguments Examples ESR Syntax Examples EVENT Syntax A6907 amp A6909 User Manual The ESE command sets the bit of the Event Status Enable Register ESER used by the status event reporting system The ESE query returns the contents of the ESER For more information on the ESER see page 3 36 ESE NRI ESE NRI can be set to a decimal value between 0 and 255 The corresponding binary value is set for ESER When the power to the instrument is turned on all bits in ESER are reset In the following example ESER will be set to 209 11010001 In such cases each of the bits PON URQ EXE and OPC will be set ESE 209 The following is a sample response to the query ESE In this example ESER is set to 11010000 208 Thi
35. TS VENDORS WILL NOT BE LIABLE FOR ANY INDIRECT SPECIAL INCIDENTAL OR CONSEQUENTIAL DAMAGES IRRESPECTIVE OF WHETHER TEKTRONIX OR THE VENDOR HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES Table of Contents Getting Started Operating Basics Reference A6907 amp A6909 User Manual General Safety Summary Product Descriptions 3 esse esse urn Options And Accessories CA eR ee CER EN FN RUN anne NECS S ACC SSOTIES an N eal a e urs bec dim Installati n syo osse 9 ee al Power Source woke ERU Pe Ue e ER T NE Lane B se ove ane eU EEUU A e ane Power Gotd J e DEVON ERR ER e pU RUPEE ES i ine Connecting the Probe Connecting Output Cables Functional Check 2 eie uv sue es wid io es Wie uen Turns On BOWED ee a ot Maes Hele Self Calibration essere ee Functional Overview 1s6lator Front Panel 22 tei ERR AL EE SE te Isolator Rear Panel VIN a Ir Rn 1s6lator Scale Factor 2 2 REND ie ee ce Special Probes rr seele Voltage Brobe pr seems ha S ERN PEST Common Lead Length AG20 Current Probe e Eder tee RES AA e ER ET ET Reference In
36. UPling Syntax Arguments 3 22 This query returns the settings for range and coupling and the offset and gain parameters for the designated channel CH lt x gt Here lt x gt indicates the channel of the A6907 1 2 3 or 4 or the channel of the A6909 1 or 2 The following is a sample response to CH1 CH1 SCLE 100 0E 3 COUPLING DC OFFSET 123 GAIN 117 This query returns whether or not the designated channel has been calibrated If it has been calibrated a value of 1 is returned If it has not been calibrated a value of 0 is returned CH x CAL Here X indicates the channel 1 2 3 or 4 The following is a sample response to CH1 CAL CH1 CAL 1 In this case channel 1 has been calibrated The CH lt x gt COUPling command sets the coupling value for the designated channel The CH lt x gt COUPling query returns the coupling status of the designated channel CH lt x gt COUPling ACIDC CH x COUPling Here x indicates the channel 1 2 3 or 4 O or AC Coupling is set to AC 1 or DC Coupling is set to DC A6907 amp A6909 User Manual Commands Returns CH lt x gt GAln Syntax Arguments CH lt x gt OFFSet Syntax Arguments CH lt x gt SCALe Syntax Arguments A6907 amp A6909 User Manual The following is a sample response to the query CH1 COUPLING CH1 COUPLING DC The CH lt x gt GAIn command sets the gain value for the des
37. User Manual 907 amp 909 High Voltage Isolators 070 9094 06 Tii LETS uan To amd ger do ro PIANTE VOL fii da ac Fer Samira prora ep Copyright Sony Tektronix Corporation 1994 All rights reserved Copyright Tektronix Inc 1994 rights reserved Tektronix products are covered by U S and foreign patents issued and pending Information in this publication supercedes that in all previously published material Specifications and price change privileges reserved Printed in Japan Sony Tektronix Corporation P O Box 5209 Tokyo Int l Tokyo 100 31 Japan Tektronix Inc Box 1000 Wilsonville OR 97070 1000 TEKTRONIX and TEK are registered trademarks of Tektronix Inc WARRANTY Tektronix warrants that this product will be free from defects in materials and workmanship for a period of one 1 year from the date of shipment If any such product proves defective during this warranty period Tektronix at its option either will repair the defective product without charge for parts and labor or will provide a replacement in exchange for the defective product In order to obtain service under this warranty Customer must notify Tektronix of the defect before the expiration of the warranty period and make suitable arrangements for the performance of service Customer shall be
38. ader is included in the response A6907 amp A6909 User Manual Commands Syntax Returns Examples IDN Syntax Returns Examples LRN Syntax A6907 amp A6909 User Manual HEADER ON The following is a sample response to the HEADer query HEADER 1 In this example the header 15 included in the response This query returns the instrument ID information ID ID SONY TEK Model CF 91 1 FV lt Firmware version no ID SONY TEK A6907 CF 91 1 FV 1 00 This query returns the instrument ID information IDN SONY TEK lt Model gt lt Serial no gt CF 91 1CN FV lt Firmware version no gt SONY TEK A6907 0 CF 91 1CN FV 1 00 This query returns the setting data for the instrument LRN 3 27 Commands OPC 2 RST SELFcal 3 28 Returns Syntax Examples Syntax Syntax The following is a sample response to LRN CH1 SCALE 100 0E 3 COUPLING DC OFFSET 132 GAIN 115 CH2 SCALE 200 0E 3 COUPLING DC OFFSET 121 GAIN 104 CH3 SCALE 500 0E 3 COUPLING AC OFFSET 137 GAIN 134 CH4 SCALE 100 0E 3 COUPLING DC OFFSET 135 GAIN 129 HEADER 1 VERBOSE 1 NOTE The LRN query always returns a string including the header regardless of the HEADer setting When a short form response has been set using the VERBose command a shortened form of the header is returned The OPC command sets the Standard Event Status Register SESR bit 0 OPC bit as soon as all pending ope
39. al Characteristics Sensitivity Input Impedance 100 mV div to 200 V div in a 1 2 5 sequence with oscilloscope set to 100mV div 10 MQ 4 5 pF 0 5 pF Maximum Input Voltage Probe Tip to Probe Common Maximum Common Mode Input Voltage Probe Common to Chassis Maximum Input Voltage Between Channels 850 V DC peak or 600 V ACnyg derate at 20 dB decade from 3 MHz to 60 MHz 850 V DC peak AC or 600 V ACaus derate at 20 dB decade from 500 kHz to 60 MHz 1700 V DC peak or 1200 V ACaws Maximum Common Mode Slew Rate Bandwidth 3 dB 100 mV div and 200 mV div 500 mV div to 200 V div Pulse Waveform Flatness 20 kV us DC to 50 MHz DC to 60 MHz 3 1 kHz and 10 kHz Rise Time 100 mV div and 200 mV div 500 mV div to 200 V div Aberrations Output Impedance lt 7 0 ns 5 8 ns 8 within first 40 ns 500 Offset Accuracy 20 mV when changes in ambient tempera ture are no greater than 3 C and self calibra tion has been performed 4 1 Specifications Table 4 1 Warranted Electrical Characteristics Cont DC Gain Accuracy Isolation Between Channels Normal Mode Common Mode Overdrive Recovery Time Power Requirements 3 of full scale when changes in ambient temperature are no greater than 3 C and self calibration has been performed 90 dB DC to 10 MHz 70 dB DC to 10 MHz lt 200ns to 3 of full scale when input voltage of 5 V
40. al poll or service request functions Enable the corresponding status register DESE 1 ESE 1 SRE 0 when using serial poll Or SRE 32 when using service request Start self calibration SELFcal Wait until self calibration has finished 3 41 Status and Events Using the OPC Query 3 42 OPC Wait while serial poll is 0 or wait for a service request to be generated Change the range CH1 SCALE 10 0 0 The OPC query writes an ASCII code 1 to the output queue when all pending operations have been completed Synchronization can be performed using the following procedure Start self calibration SELFcal Wait until self calibration has finished OPC Waits for a 1 to be written to the output queue In the event that the system is waiting for data to be retrieved from the output queue a time out may occur before the data is written to the output queue Change the range CH1 SCALE 10 0 0 A6907 amp A6909 User Manual Specifications Specifications The following electrical characteristics are valid when the instrument has been adjusted at an ambient temperature between 20 C and 30 C has had a warm up period of at least 20 minutes and is operating at an ambient tempera ture between 0 C to 50 C Warranted Electrical Characteristics A6907 amp A6909 User Manual Table 4 1 lists the guaranteed isolator characteristics Table 4 1 Warranted Electric
41. amp A6909 User Manual 6 3 Performance Verification Procedure 1 Connect the isolator CH1 probe tip and common together 2 Connect the CH1 OUTPUT of the isolator to the multimeter input 3 Set the CH1 VOLTS DIV control on the isolator to 100 mV and the CH1 COUPLING to DC 4 Check the offset accuracy by checking that the multimeter reading is within 20 mV of zero when stepping through the CH1 VOLTS DIV ranges 5 Connect the probe to the generator as shown in Figure 6 2 6 Set the CH1 VOLTS DIV control on the isolator to 100 mV 50Q Terminations 4 isolator To CH1 OUTPUT On Rear Panel To CH2 OUTPUT On Rear Panel CH2 CH3 To CH3 OUTPUT On Rear Panel O O O To CH4 OUTPUT On Rear Panel DC Calibration Digital Generator Multimeter Dual Banana Plug to BNC Adapter CH1 Probe n 6 Inch Common Lead Coaxial Cable Figure 6 2 Positive DC Gain Test Setup 7 Set the generator output to 500 mV 8 Measure and record the multimeter reading as E in Table 6 2 on page 6 6 9 Turn off the generator output 6 4 A6907 amp A6909 User Manual Performance Verification 10 Connect the probe to the generator as shown in Figure 6 3 Note that the polarity of the CH1 probe connections have been reversed 50Q Terminations 4 isolator To CH1 OUTPUT On Rear Panel
42. and returns their event codes and message texts m EVENT Retrieves the event code for only the oldest event m EVMsg Retrieves the event code and message text for only the oldest event When a new event occurs before events have been retrieved the SESR bit corresponding to that event is set and the event is placed in the event queue However only the events that have been made retrievable by the ESR query can be retrieved When yet another ESR query is issued before the retrievable events have been retrieved all of these retrievable events will be deleted In their place the next group of events those that were received after the first ESR query was issued will become retrievable 3 37 Status and Events Status and Event Processing Sequence Figure 3 9 shows an outline of the sequence for status and event processing Device Event Status Enable Register DESER 7 6 5 4 3 2 1 0 Read using DESE PON URQ CME EXE DDE QYE RQC OPC Write using DESE Standard Event Status Register SESR 7 6 5 4 3 2 1 0 Read using ESR PON URQ CME EXE DDE QYE RQC OPC Event Event Cannot be written Event Queue G Event Event Status Enable Register ESER 6 5 4 2 1 0 Read using ESE P
43. anual The GPIB interface on this instrument satisfies the IEEE 488 2 1987 standard Commands are compatible with Tektronix codes and format standards making it possible to connect with other GPIB units through the bus Table 3 1 shows the subsets for the GPIB interface on the isolator Table 3 1 GPIB Functions Function Name Subset Note Source Handshake SH Complete capability Acceptor Handshake 1 Complete capability Talker T6 Basic Talker Serial Poll Unaddress if MLA Listener L4 Basic Listener Unaddress if MTA Service Request SR1 Complete capability Remote Local RL1 Complete capability Parallel Poll PPO No capability Device Clear DC1 Complete capability Device Trigger DTO No capability Controller co No capability Drivers E2 Three state 3 9 GPIB Programming Interface Messages My Listen Address and My Talk Address MLA and MTA Go To Local GTL Device Clear DCL Selected Device Clear SDC Local Lockout LLO Serial Poll Enable and Disable SPE SPD Unlisten and Untalk UNL and UNT Interface Clear IFC Interface messages are used by the controller to manage the talker listener designation and other bus control operations This section describes the function of the interface messages and how the isolator operates when it receives an interface message from the controller The MLA and MTA messages are used to designate the instrument as a listener and a talker When the ATN
44. ation if you know the self inductance L and capacitance C of your probe and common lead Calculate the approximate resonant frequency fo at which this parasitic circuit will resonate with the following formula 2 7 Special Probes A620 Current Probe A 2 8 1 2 VLC The preceding equation shows that reducing the common lead inductance will raise the resonant frequency If your measurements are affected by ringing your goal is to lower the inductance of your common path until the resulting resonant frequency is well above the frequency of your measurements The Tektronix A620 current probe enables the display of current waveforms up to 1000 amps when used with the isolator and an oscilloscope The A620 is used where the display and measurement of distorted current waveforms and harmonics is required WARNING To avoid the risk of electrical shock do not use the A620 in circuits operating at greater than 440 VAC 650 VDC peak AC Refer to the A620 Instructions for operating and safety information Range Switch Figure 2 6 A620 Current Probe A6907 amp A6909 User Manual Special Probes A6907 amp A6909 User Manual The A620 has three operating ranges these ranges must be scaled to the operating characteristics of the isolator using the formula below Isolator V division A620 Range Switch Current division NOTE The oscilloscope vertical input must be set to 100 mv divisio
45. bac bade EU REP IS 3 14 Delimiter bia ieee Se OR RO BA we a BOS 3 15 Short Form eoe A sees ne a WO OS RR CREADA A we 3 15 Linking Commands 3 16 Command Groups 3 17 Channel Control oV E RAM RS ANE UP REN 3 17 Calibration and Testing ese deme el E en UR 3 18 Statusiand Events sn te e ETRAS RATE e 3 18 Synchronization 5 vetu WP ee Ur e EE 3 19 SYSTEM Gist Shas ee Rat Se eRe 3 19 Commands cera he I ARE eh ER V RU Ru BORA 3 21 Stats and Events oves Chas Ee mn RR IR 3 33 Registers na irische eL Ree enis 3 33 Status Registers i22 beentheievbeesshmpiebeesswebee ev een TEES 3 33 Enable Registers 552225425922 ep ences en 3 35 Q eues oos Sx oh lie een ee eve bim ene 3 37 Status and Event Processing Sequence 3 38 u CHE Db iere ires 3 39 Synchronizing Execution 3 40 Warranted Electrical Characteristics 4 1 Typical Electrical Characteristics 4 2 Mechanical Characteristics 1 4 4 Environmental Characteristics 44 Certifications and Compliances 4 5 POWER
46. bus communication it is possible to omit some of the characters in the header and argument In the description of commands in this manual characters which 3 15 Syntax absolutely must be present are shown in CAPITAL letters characters which may be deleted are shown in small letters For example for the VERBose command any of the three versions shown may be used VERBOSE VERBOS VERBO Linking Commands The semicolon can be used to link commands making it possible to include several commands in a single program message The isolator executes linked commands in the order in which they are received When linking commands it is necessary to obey the following rules 1 Except for the first one headers that are completely different are separated using semicolons and the colon that comes before the command For example to link the SELFCAL command and the CH1 SCALE 100 0E 3 command you would write the following SELFCAL CH1 SCALE 100E 3 2 When linking commands that are identical except for the mnemonic at the end of the header parts of the second command can be eliminated along with the colon at the beginning For example to link the CHI SCALE 1 OE 0 command with the CH1 COUPLING AC command you would write the following CH1 SCALE 1 0E 0 COUPLING AC The same operation will be performed if the command is written out in its entirety CH1 SCALE 1 0E 0 CH1 COUPLING AC 3 Do not place a colon in front of a c
47. e COUPLING and up SCALE buttons simultaneously The channel reverts to the normal operating mode NOTE The V DIV LED or mV DIV LED on the indicator blinks to indicate that a channel is not calibrated when you have adjusted the offset or gain manually To delete the values you have set manually perform self calibration again A6907 amp A6909 User Manual 3 3 Manual Adjustments 3 4 A6907 amp A6909 User Manual Floating Measurements A A Floating measurements are measurements where a signal is measured between the probe tip and common and not with respect to ground To prevent electrical shock the isolator probe tip and common lead for each channel are mutually isolated from one another as well as from the output The E O and O E convert ers in the isolator convert the input signals into signals referenced to the chassis after common mode elements have been rejected As a result the potential between circuit elements can be measured directly regardless of the common lead reference WARNING In order to prevent electrical shock do not attach the common lead to energized circuits above 42 V 60 V DC peak AC Use the optional industrial lead set for connecting to energized circuits above 42 V The isolator chassis is grounded by means of a three line grounded cord and three prong plug This ensures safety during the floating measurement process WARNING In order to prevent electrical shock check to make
48. ead to high impedance sections of the circuit The additional capacitive loading may cause circuit damage Connect the common lead to low impedance sections of the circuit WARNING In order to prevent electrical shock do not attach the standard common lead to energized circuits above 42 V 60 VDC peak AC Use the optional industrial lead set for connecting to energized circuits above 42 V A6907 amp A6909 User Manual Special Probes Common Lead Length A6907 amp A6909 User Manual Always use as short a common lead as possible between the probe head and circuit common when you are probing a circuit The series inductance added by the probe tip and common lead can result in a resonant circuit this circuit may cause parasitic ringing within the bandwidth of your oscilloscope Refer to Figure 2 4 Six inch Twelve inch Common Common Figure 2 4 Waveform Distortion from Common Lead Length When you touch your probe tip to a circuit element you are introducing a new resistance capacitance and inductance into the circuit Refer to Figure 2 5 R source Probe R in L Probe C i V source ENYN e L g Common Lead Figure 2 5 Common Lead Equivalent Circuit Ringing and rise time degradation can be masked if the frequency content of the signal degradation is beyond the bandwidth of the oscilloscope You can determine if ground lead effects may be a problem in your applic
49. erformance Verification 2 Configure the oscilloscope Acquisition Mode Sample Record Length 1000 points Horizontal Scale 100 us div Vertical Scale 100 mV div Vertical Offset 0 Vertical Coupling DC Input Impedance 50 Q Bandwidth Limit Full Measurement Amplitude Procedure 1 Connect the CH1 probe tip of the isolator to the output of the generator 2 Set the generator to a reference frequency of 50 kHz 3 Connect the CH1 OUTPUT of the isolator to the vertical input of the oscilloscope 4 Set the CH1 VOLTS DIV control on the isolator to 100 mV 5 Adjust the OUTPUT AMPLITUDE control on the generator so that the measured amplitude is 600 mV 6 Increase the FREQUENCY control on the generator until the measured amplitude is 420 mV NOTE Adjust the oscilloscope horizontal scale factor to display 10 to 20 cycles 7 Check that the generator output frequency is greater than the value given in Table 4 1 on page 4 1 8 Reset the horizontal scale on the oscilloscope to 100 us div 9 Set the CH1 VOLTS DIV control on the isolator to 500 mV 10 Set the output of the generator to the 50 kHz reference frequency 11 Adjust the OUTPUT AMPLITUDE control on the generator so that the measured amplitude is 600 mV 12 Increase the generator output frequency until the measured amplitude is 420 mV NOTE Adjust the oscilloscope horizontal scale factor to display 10 to 20 cycles A6907 amp A6909 User Manual 6 13
50. event reporting system which informs the user of crucial events that occur on the instrument The isolator is equipped with four registers and one queue that conform to IEEE Std 488 2 1987 as well as one register and one queue that conform to Tektronix specifications This section will discuss these registers and queues along with status and event processing There are two main types of registers m Status Registers stores data relating to instrument status This register is set by the isolator m Enable Registers determines whether to set events that occur on the instrument to the appropriate bit in the status registers and event queues This type of register can be set by the user There are two types of status registers the Status Byte Register SBR and the Standard Event Status Register SESR Each of the bits in these status registers is used to record specific types of events such as execution errors and service requests When an event occurs the corresponding bit is set to 1 Therefore by reading the contents of these registers it is possible to find out what type of event has occurred The SBR is made up of 8 bits Bits 4 5 and 6 are defined in accordance with IEEE Std 488 2 1987 see Table 3 10 These bits are used to monitor the output queue SESR and service requests respectively Bits 0 3 and 7 are user defin able bits On the isolator however these bits are not used so they are perma nently set to 0
51. has been applied at 500 mV DIV 100 to 240 VAC 50 to 60 Hz Power Consumption Maximum A6907 A6909 Fuse Rating 48W 28W 2 5 A 250 V fast blow Typical Electrical Characteristics Table 4 2 lists typical electrical characteristics that are provided for the user s convenience These characteristics have no tolerances and are not guaranteed Table 4 2 Typical Electrical Characteristics 4 2 DC Linearity 2 typical at 25 C Common Mode Rejection Ratio 1 MHz 55 dB 100 mV div 40 dB 1 V div 10 MHz 55 dB 100 mV div 40 dB 1 V div Output Noise Level DC to 100 MHz 100 mV div 2 5 mVnys 200 mV div 1 5 mVaus 500 mV div to 200 V div 1 1 mVaus Total Harmonic Distortion 1 kHz Sine Wave 296 at 1 Vp p output Maximum Output Voltage 500 mV with 50 load Skew Between Channels Common to Chassis Capacitance 2 ns 80 pF typical A6907 amp A6909 User Manual Specifications 600 V 60V Voltage RMS 6V 1 kHz 10 kHz 100 kHz 1 MHz 10 MHz 100 MHz Frequency Figure 4 1 Frequency Derating for the Maximum Normal Mode Voltage 600 V 60V Voltage RMS 6V 1 kHz 10 kHz 100 kHz 1 MHz 10 MHz 100 MHz Frequency Figure 4 2 Frequency Derating for the Maximum Common Mode Voltage A6907 amp A6909 User Manual 4 3 Specifications Mechanical Characteristics Table 4 3 list the mechanical characteristics that define the
52. ield Immunity IEC 801 4 Electrical Fast Transient Burst Immunity EC Declaration of Conformity Low Voltage A6907 amp A6909 User Manual Compliance was demonstrated to the following specification as listed in the Official Journal of the European Communities Low Voltage Directive 73 23 EEC EN 61010 1 1993 Safety requirements for electrical equipment for measurement control and laboratory use HD401S1 Safety requirements for electronic apparatus 4 5 Specifications 4 6 A6907 amp A6909 User Manual 7 Theory of Operation Theory of Operation Power A50 Distribution Board U10 and U20 15 Volt Supplies A30 Floating Power Supply A6907 amp A6909 User Manual The isolator consists of three major circuit sections power signal and control and calibration This chapter discusses the operation and relationships of each of these sections The isolator has ground referenced and floating power supplies to support instrument control and signal conversion The isolation integrity of the floating power supplies is critical to the safe operation of the isolator The A50 controls AC and DC power distribution throughout the isolator The assembly is controlled by the front panel ON STBY switch and applies DC power to the floating power supplies when placed in the ON condition The assembly also contains a lithium battery that provides back up power for memory functions and a 5 volt regulator for front pane
53. ignated channel The CH lt x gt GAIn query returns the gain status of the designated channel CH lt x gt GAIn NR1 CH lt x gt GAIn Here lt x gt indicates the channel 1 2 3 or 4 lt 1 gt is an integer from 55 to 255 The CH lt x gt OFFSet command sets the offset value for the designated channel The CH lt x gt OFFSet query returns the offset status of the designated channel CH lt x gt OFFSet lt NR1 gt CH lt x gt OFFSet Here lt x gt indicates the channel 1 2 3 or 4 lt 1 gt is an integer from 55 to 255 The CH lt x gt SCALe command sets the range for the designated channel The CH lt x gt SCALe query returns the range of the designated channel CH lt x gt SCALe lt NR3 gt CH lt x gt SCALe Here lt x gt indicates the channel 1 2 3 or 4 lt NR3 gt indicates the range the unit is Volt div On the isolator the range can be set to any value between 200 V div and 100 mV div 3 23 Commands Examples CLS Syntax DESE Syntax Arguments Examples 3 24 In the following example the range for channel 1 will be set to 100 mV div CH1 SCALE 100 0E 3 The following is a sample response to the query CH2 SCALE CH2 SCALE 5 0E 0 This command clears the Standard Event Status Register SESR used by the status event reporting system See page 3 34 for more information on the SESR CLS The DESE command sets the bit of the Device Event Status Enable Register DE
54. l power U10 and U20 are 15 volt power supplies in a bipolar configuration AC power is routed to the supplies from the A50 assembly that distributes the DC output of the supplies The DC supplies are powered on when the the rear panel POWER switch is placed in the ON position The A30 floating power supply converts the 15 volts from the A50 to an isolated 15 volts to power the electrical to optical E O converters The A30 uses a 500 kHz oscillator and transformer assembly to transfer the power while electrically isolating it The secondary potential is full wave rectified and filtered before being passed on to the E O converter where it is regulated The typical output voltage is an isolated 9 VDC 5 1 Theory of Operation Signal Electrical to Optical E O Optical to Electrical O E The A6907 and A6909 electrically isolate the input signal by coupling an analogue of it through an internal optical link A signal acquired between the probe tip and the common lead is routed to the electrical to optical E O converter The signal is scaled by the attenuator and then used to amplitude modulate an LED The LED is mounted on top of the converter and illuminates a receiver photodetector in the optical to electrical O E converter All of the circuits within the isolator are isolated from other channels and are floating in respect to ground The optical to electrical converter receives the modulated light beam from the E O
55. le m A620 current probe A6907 amp A6909 User Manual Installation The isolator must be connected to line power before you can configure it for measurements Please read this portion carefully to avoid equipment damage or personal injury Power Source The A6907 and A6909 can be used with AC power at frequencies from 50 Hz to 60 Hz and at voltages from 100 V to 240 V Line Fuse Make sure that the proper line fuse has been installed before connecting the isolator to the power source CAUTION The isolator may be damaged if the wrong line fuse is installed Check the fuse holder located beneath the input power connector 1 2 3 A6907 amp A6909 User Manual Disconnect all power and signal connections to the isolator Use a small straight slot screwdriver to pry the cap out of fuse holder Verify proper fuse value Standard 115 V 2 5 A 250 V fast blow Options Al A2 amp 5 230 V 2 5 A 250 V slow blow For the correct part number of each fuse refer to Replaceable Parts on page elelele Install the proper fuse and reinstall the fuse holder cap Installation Power Cord ZN Connecting the Probe A WARNING In order to prevent electrical shock only plug the power cord into grounded three wire outlets Do not defeat the ground connection on the plug The A6907 and A6909 power cords are three wire grounded cords The metal portions on the
56. line is TRUE the instrument will become a talker when it receives an MTA message When the ATN line is no longer true the instrument will begin source handshaking and data transmission When the ATN line is true and the instrument receives an MLA message it becomes a listener and is able to receive the data sent from the talker When the isolator receives a GTL message it changes to LOCAL status This message initializes the communication status between the instrument and the controller When it receives a DCL message the instrument will clear all I O messages and unexecuted control settings This will also clear all errors and all Report Waiting events other than the Power On event Also when a DCL message is received the SRQ will be cleared if an SRQ has been sent for any other reason than Power On This message is the same as the DCL message However only instruments addressed as listeners will respond to an SDC message When the instrument receives an LLO message in REMOTE status it will become impossible to control the isolator using the keys on the front panel If an LLO message is received in LOCAL status control using the keys on the front panel will become ineffective when the instrument has been changed to REMOTE status The instrument addressed as the talker transmits a serial poll status byte in response to the Serial Poll Enable SPE message The Serial Poll Disable SPD message returns the instrument to normal status
57. ms to IEEE Std 488 1 1987 GPIB cards are available to provide this capability for personal computers Attach an IEEE Std 488 1 1987 GPIB cable see Optional Accessories in the Replaceable Parts section between the GPIB connector and your controller Figure 3 2 also shows how cables can be stacked together if you do not have a multiple connection cable You can stack a second cable on either the isolator connector or the controller connector to similarly connect your oscilloscope Figure 3 2 Typical Stacked GPIB Connectors 3 7 GPIB Programming GPIB Requirements Observe these rules when you use your isolator with a GPIB network W Assign a unique device address to each device on the bus No two devices can share the same device address m Do not connect more than 15 devices to the bus m Connect one device for every 2 meters 6 feet of cable used m Do not use more than 20 meters 65 feet of cable for the entire bus m Turn on at least two thirds of the devices on the network while using the network m Connect the devices on the network in a star or linear configuration as shown in Figure 3 3 Do not use loop or parallel configurations GPIB Device GPIB Device GPIB Device Figure 3 3 Typical GPIB Network Configurations GPIB Device GPIB Device GPIB Device GPIB Device Setting the GPIB Parameters Setting the Bus Address 3 8 You must set the GPIB parameters
58. n 1 Make sure that each channel output is terminated into 50 2 Setthe oscilloscope input attenuators to 100 mV division 3 Press the CAL button on the front panel Self calibration will begin and the gain and offset values for each channel will be calibrated If self calibration completes without error the values shown on the indicators will return to normal NOTE If error code EO6 appears after self calibration it may be because a 50 2 load is not connected to the channel output If a load is properly con nected but the error code is still displayed contact your local Tektronix Field Office If you need to enter custom offset or gain values refer to the Manual Adjust ments section starting on page 3 3 A6907 amp A6909 User Manual _ Operating Basics Functional Overview This section describes the controls indicators and connectors on the A6907 and A6909 Figures 2 1 and 2 2 show the A6907 the A6909 does not have channels 3 and 4 Isolator Front Panel ON STBY 2 CALI 6907 Four CHANNEL ISOLATOR oO N CH2 I CH3L VA CHAL CAL ON STBY C 2 C 2
59. n when using the scale conversion formula For example If the isolator is set at 10 V div and the probe is set to 10 mV A then the displayed current per division will be 1000 A division Current division NEE ENE 1000 A division 10 mV Amp Special Probes 2 10 A6907 amp A6909 User Manual Br Reference Reference Introduction Manual Adjustments The Reference section contains information on adjusting and operating the isolator We have organized this section to provide basic information first and information for experienced users at the end This section contains the following information After the calibration routine is completed you may want to make adjustments to the offset and gain factors This section provides detailed instructions for this process Floating Measurements GPIB Programming Syntax Command Groups Commands A6907 amp A6909 User Manual This section describes some of the terms and procedures used when making measurements that are not referenced to earth ground This section describes the set up and fundamental theory of controller operation of the isolator This section describes the syntax or grammar of the commands that the controller will pass to the isolator This section lists the commands in groups according to the nature of their functions and includes brief definitions and examples of the commands This section list the commands in alphabetical order and provides
60. of the isolator to match the configuration of the bus and controller Use the following procedure to set the bus address on the isolator The default value for bus address set at the factory is 1 1 Simultaneously press the CH1 COUPLING key and the CH2 down SCALE key on the front panel The current address setting will appear on the CHI indicator 2 Use the CH1 up and down SCALE keys to set the value as desired 3 Once again press the CH1 COUPLING key and the CH2 down SCALE key simultaneously The value you have set will be registered as the address and the isolator will revert to normal operation A6907 amp A6909 User Manual GPIB Programming Message Terminators The bus address can be set to any value between 0 and 31 Setting a value of 31 will cause the isolator to be logically separated from the GPIB interface As a result it will not respond to any GPIB address and will be unable to receive or transmit The isolator accepts a line feed LF character simultaneous with the EOI as the end of a series of received bytes It also transmits an LF with the EOI at the end of a series of transmitted bytes Other Documents You Will Need To completely understand and implement a GPIB system you will need the documentation that supports your controller If you are using a personal computer with a GPIB card you will need the documentation for both the PC and the GPIB card GPIB Interface Functions A6907 amp A6909 User M
61. ols and Meanings 3 13 Table 3 3 Header Configuration Types 3 14 Table 3 4 Numeric Expressions 3 15 Table 3 5 Channel Control 3 17 Table 3 6 Calibration and Testing 3 18 Table 3 7 Status and Events 3 18 Table 3 8 Synchronization 3 19 Table 3 9 System Commands 3 19 Table 3 10 SRB Bit Functions 3 34 Table 3 11 SESR Bit Functions 3 34 Table 3 12 Normal Status 3 39 Table 3 13 Command Errors 3 39 Table 3 14 Execution Errors 3 40 Table 3 15 Internal Errors 3 40 Table 3 16 System Events 3 40 Table 4 1 Warranted Electrical Characteristics 4 1 Table 4 2 Typical Electrical Characteristics 4 2 Table 4 3 Mechanical Characteristics 4 4 Table 4 4 Environmental Characteristics 4 4 Table 4 5 Certifications and Compliances 4 5 Table 6 1 Re
62. ommand that begins with an asterisk CH1 COUPLING AC CAL 3 16 A6907 amp A6909 User Manual Command Groups This section describes the commands in general categories Commands to the A6907 and A6909 can be generally divided into five groups Channel control Calibration and testing Status and events Synchronization System Items followed by questions marks are queries items without question marks are commands Some items in this section have a question mark in parentheses in the command header section this indicates that the item can be both a command and a query Channel Control These items control the range input coupling offset and gain values for each channel Table 3 5 Channel Control Header Description CH lt x gt Range input coupling or other query CH lt x gt CAL Query regarding calibration status CH lt x gt COUPling Input coupling setting CH lt x gt GAln Gain setting CH lt x gt OFFSet 2 Offset setting CH lt x gt SCALe 9 Range setting A6907 amp A6909 User Manual 3 17 Command Groups Calibration and Testing These items are used to execute the instrument s built in self calibration and self test routines Table 3 6 Calibration and Testing Header CAL Description Executes self calibration SELF cal Executes self calibration TST Status and Events Executes self test These items set and query the status and events repor
63. pe Check that the rise time is within the tolerance given in Table 4 1 on page 4 1 Check that the aberrations are within the tolerance given in Table 4 1 on page 4 1 Set the CH1 VOLTS DIV control on the isolator to 500 mV Set the vertical scale on the oscilloscope to 50 mV div Adjust the AMPLITUDE control on the generator for four divisions of display on the oscilloscope Check that the rise time is within the tolerance given in Table 4 1 on page 4 1 Check that the aberrations are within the tolerance given in Table 4 1 on page 4 1 Reset the vertical scale control on the oscilloscope to 100 mV div Repeat steps 1 through 12 for all channels Disassemble the test setup Performance Verification Bandwidth Check Required Equipment m Oscilloscope m 50 Q Precision Coaxial Cable m 50 Q Coaxial Cable m 50 Q Feedthrough Termination m Leveled Sine Wave Generator m BNC to Terminal Adapter Setup 1 Assemble the test setup as shown in Figure 6 6 Leveled Sine Wave Generator uw d Test Oscilloscope Output Precision Coaxial Cable 500 Termination Dual Banana Terminals to BNC Adapter CH1 Probe _ fl 6 Inch Common Lead Coaxial Cable To CH1 OUTPUT Connector isolator On Rear Panel CH2 CH3 O O Figure 6 6 Bandwidth Check Setup 6 12 A6907 amp A6909 User Manual P
64. procedures the test environ ment must meet these qualifications The cabinet must be in place You must perform and pass the self calibration routine The isolator must have been last adjusted at an ambient temperature between 20 C and 430 C must have been operating for a warm up period of at least 20 minutes and must be operating at an ambient temperature between 0 C and 50 C probes must be fitted with 6 inch common leads 6 1 Performance Verification Required Equipment Table 6 1 lists all the test equipment required to do the performance check procedure Test equipment specifications described are the minimum necessary to provide accurate results For test equipment operation information refer to the appropriate test equipment instruction manual Table 6 1 Required Test Equipment Description Minimum Requirements Example Purpose Oscilloscope Bandwidth 350 MHz Tektronix 5460 Various Tests Digital Multimeter 41 Digit Tektronix DM2510 Checking Offset and Gain DCV range 20 V DCV accuracy 0 196 DC Calibration Generator Variable amplitude 100 V Fluke 5700A Checking Offset and Gain Accuracy 0 2 Calibration Generator Fast rise signal level 100 mV to Tektronix PG506A Checking Rise Time and Ab 1V erration Repetition rate 100 kHz Rise time 1 ns or less Flatness 2 Leveled Sine Wave 250 kHz to 100 MHz Tektronix SG503 Checking Bandwidth Generator Variable amplitude to 5 Vp p in
65. quired Test Equipment 6 2 Table 6 2 Isolator Gain Accuracy 6 6 Table 6 3 Isolator Test Qualification Record 6 15 A6907 amp A6909 User Manual General Safety Summary Injury Precautions Use Proper Power Cord Avoid Electric Overload Ground the Product Do Not Operate in Wet Damp Conditions Do Not Operate in Explosive Atmosphere Review the following safety precautions to avoid injury and prevent damage to this product or any products connected to it Only qualified personnel should perform service procedures While using this product you may need to access other parts of the system Read the General Safety Summary in other system manuals for warnings and cautions related to operating the system To avoid fire hazard use only the power cord specified for this product To avoid electric shock or fire hazard do not apply a voltage to a terminal that is outside the range specified for that terminal This product is grounded through the grounding conductor of the power cord To avoid electric shock the grounding conductor must be connected to earth ground Before making connections to the input or output terminals of the product ensure that the product is properly grounded To avoid electric shock do not operate this product in wet or damp conditions To avoid injury or fire hazard do not operate this product in an explosive
66. rations have been completed The OPC query returns a value of ASCII character 1 as soon as all pending operations have been completed OPC OPC The OPC command can be used to synchronize instrument operation and application programs For the method used to accomplish this see Synchronizing Execution on page 3 40 This command initializes the instrument RST The SELFcal command executes the self calibration routine The SELFcal query returns the results of self calibration SELFcal SELFcal A6907 amp A6909 User Manual Commands Returns SET Syntax Returns SRE 2 Syntax Arguments A6907 amp A6909 User Manual NRI Here NR 1 is one of the following 0 Self calibration was completed without error 100 An error was detected in the channel 1 offset calibration 110 An error was detected in the channel 1 gain calibration 200 An error was detected in the channel 2 offset calibration 210 An error was detected in the channel 2 gain calibration 300 An error was detected in the channel 3 offset calibration 310 An error was detected in the channel 3 gain calibration 400 An error was detected in the channel 4 offset calibration 410 An error was detected in the channel 4 gain calibration This query returns data on instrument settings This is the same as the operation performed by the L RN query SET The following is a sample response to SET CH1
67. re sent from the controller and the execution of each command is completed in a short period of time However some commands require a longer period of time to complete execution These commands are designed so that the next command to be sent is executed without waiting for the previous command to be completed In some cases a process executed by another command must first be completed before these commands can be executed in other cases these commands must be completed before the next command is executed A6907 amp A6909 User Manual Status and Events Using the WAI Command Using the OPC Command A6907 amp A6909 User Manual The execution of the commands shown below must be synchronized with the execution of other commands When these commands are executed at the same time as other commands the results of all commands executed in the same time will be irregular CAL RST TST SELFcal To synchronize execution use the following commands OPC OPC WAI The WAI command can be used to easily synchronize execution Simply send the WAI command and then send the next command In the following example self calibration will be executed and then the range will be changed SELFcal WAI CH1 SCALE10 0E 0 Or SELFcal WAI CH1 SCALE 10 0E 0 The OPC command sets the SESR OPC bit when all pending operations have been completed It is possible to synchronize execution by using this command together with the seri
68. responsible for packaging and shipping the defective product to the service center designated by Tektronix with shipping charges prepaid Tektronix shall pay for the return of the product to Customer if the shipment is to a location within the country in which the Tektronix service center is located Customer shall be responsible for paying all shipping charges duties taxes and any other charges for products returned to any other locations This warranty shall not apply to any defect failure or damage caused by improper use or improper or inadequate maintenance and care Tektronix shall not be obligated to furnish service under this warranty a to repair damage resulting from attempts by personnel other than Tektronix representatives to install repair or service the product b to repair damage resulting from improper use or connection to incompatible equipment or c to service a product that has been modified or integrated with other products when the effect of such modification or integration increases the time or difficulty of servicing the product THIS WARRANTY IS GIVEN BY TEKTRONIX WITH RESPECT TO THIS PRODUCT IN LIEU OF ANY OTHER WARRANTIES EXPRESSED OR IMPLIED TEKTRONIX AND ITS VENDORS DISCLAIM ANY IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE TEKTRONIX RESPONSIBILITY TO REPAIR OR REPLACE DEFECTIVE PRODUCTS IS THE SOLE AND EXCLUSIVE REMEDY PROVIDED TO THE CUSTOMER FOR BREACH OF THIS WARRANTY TEKTRONIX AND I
69. rols to change back to LOCAL status REMOTE LOCKOUT control will be canceled when the REN line is no longer true GPIB Programming 3 12 A6907 amp A6909 User Manual Syntax The isolator is equipped with a set of commands for remote control from an external controller This section describes how to use these commands to create programs for controlling the instrument In explaining these commands this manual will use the following symbols Table 3 2 BNF Symbols and Meanings Symbol Meaning lt gt Indicates a defined element Dic Indicates that the left member is defined as shown by the right member Delimits Exclusive OR elements Delimits a group of elements one of which must be selected Delimits an optional element may be omitted Indicates that the previous element is repeated Command Configuration There are two types of commands configuration commands and query com mands In this manual we will refer to these as commands and queries Commands are used to set and change values on the instrument and to execute specific operations Queries are used to obtain information on instrument status Commands have the following configuration lt header gt lt space gt lt argument gt In several cases the same format is used for both commands and queries This is done by putting a question mark after the header of a command to turn it into a query A6907 amp A6909 User Manual 3 13
70. s query returns the contents of the Standard Event Status Register SESR used by the status event reporting system See page 3 34 for more information on the SESR ESR The following is a sample response to the query ESR In this example SESR Is set to 10110101 181 This query retrieves the code for the oldest event of the retrievable events in the event queue For more information on event codes see Messages on page 3 39 EVENT 3 25 Commands Returns EVMsg Syntax Returns EVQty Syntax Returns HEADer Syntax Arguments Examples 3 26 The following is a sample response to EVENT EVENT 100 This query retrieves the code for the oldest event of the retrievable events in the event queue as well as the message corresponding to that code For more information on event codes see Messages on page 3 39 EVMsg The following is a sample response to EVMsg EVMSG 100 Command Error This query returns the number of events in the event queue EVQty The following is a sample response to EVQty EVQTY 4 The HEADer command specifies whether to include or omit the header from the response to all queries with the exception of IEEE Std 488 2 common com mands The HEADer query returns whether or not the response message includes a header HEADer OI1IOFFION HEADer O or OFF Header is omitted from response 1 or ON Header is included in response In this example the he
71. stment of the offset and gain values See Manual Adjustments on page 3 3 for more details aA 0 VIDIV mV DIV VOLT DIV WITH OSCILLOSCOPE SET AT 100 mV DIV INPUT A Q NORMAL MODE lt 800 Vrms COMMON MODE lt 800 Vrms 10 4 5 pF A SCALE Pressing the up and down SCALE buttons adjusts the attenuator scale for each channel on the isolator The isolator attenuator scale can be set to any value between 100 mV and 200 V per division in 1 2 5 increments The value shown on the channel indicator is the value when the oscilloscope connected to the isolator is set to 100 mV per division These buttons are also used during manual adjustment of the offset and gain See Manual Adjustments on page 3 3 for more details CHANNEL DISPLAY The channel display indicates channel coupling and scale factor The display also shows error codes in the event of an error in the self test or self calibration processes INPUT The INPUT connection is where the probe is connected to the isolator Do not attempt to substitute any other style probes for the ones that are provided with the isolator The provided probes are specially insulated and using substitute probes may cause an electrical safety hazard WARNING To avoid the risk of electrical shock do not connect any other probes than those shipped with the isolator A6907 amp A6909 User Manual Functional Overview Isolator Rear
72. ting system in order to check the status of the instrument and control the occurrence of events For details on the status and event reporting system see the Status and Events section beginning on page 3 33 Table 3 7 Status and Events Header Description ALLEv Dequeues all events from event queue CLS Clears Standard Event Status Register SESR DESE Sets and queries DESER ESE Sets and queries ESER ESR Queries SESR setting EVENT Dequeues event from event queue EVMsg Dequeues event from event queue EVQty Queries the number of events in the event queue SRE 2 Sets SRER STB Queries SBR setting A6907 amp A6909 User Manual Command Groups Synchronization System A6907 amp A6909 User Manual These commands are used for synchronous control of command execution when it is necessary to wait for all actions to finish before executing the next com mand For a detailed explanation of how these commands are used see Synchronizing Execution on page 3 40 Table 3 8 Synchronization Header Description OPC Operation finished WAI Waiting for command execution These items are used to control the handling of the header in the response message to query ID or setting data or to initialize the instrument Table 3 9 System Commands Header Description HEADer Control header in response message ID Queries instrument ID data IDN Queries instrument ID data
73. tion 10 on the A6909 m 20kV us slew rate A6907 amp A6909 User Manual 1 1 Product Description 1 2 A6907 amp A6909 User Manual Options And Accessories Options A6907 amp A6909 User Manual Several options and accessories are available for your isolator Please review this listing to select the items that best suit your application The following options are available for the A6907 and A6909 m Option 10 includes the GPIB interface on the A6909 m Options A1 A3 5 Besides the standard North American 110 V 60 Hz power cord Tektronix will ship any of four alternate power cords with the isolator when ordered by the customer Table 1 1 Optional Power Cords Plug Configuration Normal Usage Option Number Europe 230 V United Kingdom 230 V Australia 230 V Switzerland 230 V 1 3 Options and Accessories Accessories 1 4 Standard Accessories Optional Accessories The following standard and optional accessories are available for the A6907 and A6909 Refer to the Replaceable Parts section for current part numbers The A6907 and A6909 come with the following standard accessories W Power cord Fuses 2 5 Amp 250V fast blow 500 BNC cable set 4 cables with A6907 2 cables with 6909 m Special probes 4 with A6907 2 with A6909 Instruction Manual The following optional accessories are available for the A6907 and A6909 m 50 BNC feedthrough termination m GPIB cab
74. to 50 50 kHz reference 50 Precision Coaxial Cable 500 precision cable for Tektronix part number Signal connection G503 012 0482 00 50 Coaxial Cable 50 43 in male to male BNC Tektronix part number Signal connection connectors 012 0057 01 50 Termination Impedance 50 connectors Tektronix part number Signal termination female BNC input male BNC 011 0049 01 output Dual Banana Connector Female BNC to dual banana Tektronix part number Signal connection 2 required 103 0090 00 6 2 A6907 amp A6909 User Manual Performance Verification Offset and Gain Check Required Equipment m Digital Multimeter m DC Calibration Generator m 50 Q Coaxial Cable m 50 Q Feedthrough Termination m BNC to Terminal Adapter Dual Banana Connector Setup 1 Assemble the test setup as shown in Figure 6 1 500 Terminations 4 isolator To CH1 OUTPUT On Rear Panel To CH2 OUTPUT On Rear Panel CHI CH2 CH3 To CH3 OUTPUT On Rear Panel O CH4 OUTPUT On Rear Panel DC DC Digital Calibration Multimeter Generator Dual Banana Plug pm to BNC Adapter CH1 Probe OO DIS E 6 Inch Common Lead Coaxial Cable Figure 6 1 DC Offset and Gain Test Setup 2 Setthe multimeter mode to DC voltage 3 Press the CAL button on the isolator to start the self calibration A6907
75. troduction Manual Adjustments Adjusting Offset Values ressonar o eaae ded de Re Res Adjusting Gain Values ls eos ask apr RR RE Rs Floating Measurements Maximum Common Mode Slew Rate Special Probe de ea beet ende RE CURES Common Lead Connections Common Mode Rejection Ratio CMRR GPIB Programming GPIB Requirements lso sis de pin CN RE UR UMP EE Setting the GPIB Parameters Other Documents You Will Need GPIB Interface Functions Interface Messages rn RC eL Eden erate ER PESE hes T L vii lp O0 O0 O tA CA UN TN a 1 ee o m l D EP QN CA T adh o Xo oo oo Contents Specifications Theory of Operation Remote Local and Lockout 3 11 SV LUE en arenas eh RO RUE We teme RS UR see 3 13 Command Configuration 3 13 Header 225 2 paises nts bl RESI RR LR e nda RR E hae EUER 3 14 Arguments A eA eG eee bee

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