M192 Programmable AC/DC load
Contents
1. wire connection e Change mode of keyboard to cursor mode by pushing the ENTER key e Change calibration value of selected resistance if needed e Confirm new calibration data by pushing ENTER key or leave without changes by ESC key e Repeat above described procedure for all resistance elements 6 2 Voltmeter calibration M 192A version only In Voltmeter calibration mode can be changed parameters of internal AC DC voltmeter For calibration is required voltage calibrator with ranges up to 250V and required accuracy Alternatively can be used voltage source and accurate voltmeter Table contains nominal values of calibration points and required recalibration accuracy Calibr point Required Accuracy U AC high 250V 100 mV Calibration procedure e Set the first calibration point U DC pos e Press ENTER key to confirm selected point e Connect the voltage calibrator to the load R terminals and set the output value 100V dc e Change mode of keyboard to cursor mode by pushing the ENTER key e Change exact value of connected DC voltage It should be close to the nominal value 1090 e Confirm new calibration data by pushing ENTER key or leave without changes by ESC key e Repeat above described procedure for all calibration points 17 Operation manual MEATEST M 192 AC DC Resistance load 7 Error messages If an error occurs during the loads s operation or control error message is displayed on the display E2. constant Resistance constant Power simulation constant Current simulation 30 100 ms instrument terminals diameter 4mm gold plated RS232 as standard IEEE488 optionally 18 C 28 C 5 C 45 C 10 C 60 C metal W 430 mm H 190 mm D 500 mm 15 kg gt 2 GQ at 500V DC Basic version M 192 allows to select between 64 fixed resistance values Nominal values of resistancis are 15 0 15 5 16 0 16 5 17 0 17 5 18 0 18 5 19 0 19 5 20 21 22 23 24 25 26 27 28 29 30 32 34 36 38 40 42 44 46 48 50 55 60 65 70 75 80 85 90 95 100 110 120 130 140 150 160 180 200 220 240 270 300 340 400 480 600 680 800 960 1200 1590 2400 and 47002 Reaction time means time interval between setting up value from front panel or receiving command from remote control bus and settling set up value on output terminals Notes e Only data shown with tolerance or with band of limits are tested All other values have informative character e During over switching resistance circuit is opened for a period about 40 ms 27 Operation manual MEATEST M 192 AC DC Resistance load 12 Accuracy Specified accuracy is valid after 10 minutes warm up in temperature range 23 5 oC Uncertainties include long term stability temperature coefficient linearity load and line regulation and traceability of factory to National calibration standards Accuracies assigned in are
3. after pressing ENTER key The parameter in edit mode is displayed between marks lt and gt lt 50 652 Q In case parametr can t be switched to edit mode you should use password with higher access level vide infra 5 3 Setup mode Access to the Setup mode is enabled after pushing the ENTER key from the Standard mode 6 3 1 Load configuration Instrument Item serves for configuration of instrument s output After pushing key next item General is selected After pushing ENTER key following menu is displayed 6 3 1 1 Simulated function Function This item is available only in M 192A full version Load can simulate a Resistance constant resistance mode Load simulates required resistance in Q b Current constant current mode Load measures voltage connected to the R terminals and sets output resistance according to the formula R Measured voltage Required current This resistance can be automatically refreshed recalculated according to the state of C P refresh parameter 11 Operation manual MEATEST M 192 AC DC Resistance load c Power constant power mode Load measures voltage connected to the R terminals and sets output resistance according to the formula R Measured voltage 2 Required power This resistance can be automatically refreshed recalculated according to the state of C P refresh parameter 6 3 1 2 Refresh cycle for Current and Powe
4. five digits password for access level Calibration 56 NAR NUR Service access password Srvc password Item enables to set five digits password for access level Service 6 3 2 4 Language LANGUAGE Item enables to set the language You can select one of following items English Cesky Deutsch 6 3 2 5 Device information INFO Item enables to read out device internal information 524 2 5 T Serial number Serial number Function displays instrument s serial number as xxxxxx six digits 6 3 2 544 Firmware version FW version Function displays internal firmware version 13 Operation manual MEATEST M 192 AC DC Resistance load 6 3 2 6 Interface setting Interface 6 3 2 6 1 RS232 parameters RS232 Baud Rate Item is available only for RS232 version Item enables to set the baudrate You can select one of following baud rates 1200 2400 4800 9600 and 19200 6 3 2 6 2 IEEE488 address IEEE488 Item is available only for IEEE488 version Item enables to set the IEEE488 address You can select any integer value in range 1 30 6 3 3 Protected area Protected Protected settings calibration constants and service settings are in this item Correct password should be written before entering protected area M 192 has two access levels for protected parameter s setting u Calibration calibration laboratory default password is 00000 and can be changed by the user Service only
5. for authorized service Access level is defined by used password After pushing ft key previous item General is selected After pushing ENTER key following menu is displayed 6 3 3 1 Calibration constants Calibration All calibration constants are store in internal eeprom 6 5 3 1 1 Resistance values R constant In this menu resistance elements of the load can be recalibrated Complete recalibration procedure consists of measuring of 24 resistance values and entering their actually measured values Detailed description of calibration procedure is in chapter Calibration 6 3 3 1 2 Internal voltmeter Voltage In this menu internal volmeter can be recalibrated Complete recalibration procedure consists of adjusting of 4 calibration points Detailed description of calibration procedure is in chapter Calibration 6 3 3 2 Service setting Service Item is available only for service department after entering service password Operation manual 14 M 192 AC DC Resistance load MEATEST m3 2 1 Internal state reading View In this item can be displayed following information Fan speed speed of fans Temp heat sink temperature of internal heat sinks Temp others temperature of frame and temperature of internal air CPU firmware version of main CPU FW RE firmware version of auxiliary CPU FW 6 3 3 2 2 Temperature sensors calibration Temp calibr In this item can be adjusted offest of al
6. is ensured by the design and by the use of specific component types The manufacturer is not liable for the damage caused by modification of the construction or replacement of parts with non original ones Safety symbols used on the equipment Warning reference to the documentation Warning risk of electric shock Operation manual 6 M 192 AC DC Resistance load MEATEST 4 Description 4 1 Front panel On the front panel there are located all main control keys display and output terminals 1 Output terminals Output resistance is available on R output terminals Available is 2 3 and 4 wire connection 2 Display Two row alphanumerical display is used for displaying all information Main value i e simulated output resistance is displayed in upper row In the lower row mesaured voltage connected to the output terminals M 192A only is displayed Auxiliary information is displayed in lower row Depending on status following symbols can be displayed in right low corner T keys 2 4 6 and 8 are switched to the cursor keys function blue labels are valid load is in remote control via RS232 IEEE488 optionally 7 Operation manual MEATEST M 192 AC DC Resistance load 3 Keyboard Numerical values can be entered from the numerical part of keyboard Keys with number 2 4 6 8 have also next meaning as display cursor keys Except numerical there are following keys in the keyboard Key Meaning MENU enters to
7. listed in this chapter are explained in two columns KEYWORD and PARAMETERS KEYWORD column includes the name of the command Each command includes one or more keywords If a keyword is in brackets it is not mandatory Non mandatory commands are used only to achieve compatibility with language standard SCPI Capitals designate the abbreviated form of the commands extended form is written in lowercase Command parameters are in brackets lt gt each parameter is separated using a comma Parameters in brackets are not mandatory Line means or and is used to separate several alternative parameters Semicolon is used to separate more commands written on one line E g SAF LR 100 5 0UTP ON Note only for RS232 Each command must end in cr or If Both codes lt crlf gt can be used at the same time The instrument performs all commands written on one line of the program after it receives cr If or lt crlf gt code Without this code the program line is ignored Description of abbreviations lt DNPD gt Decimal Numeric Program Data this format is used to express decimal number with or without the exponent lt CPD gt Character Program Data Usually it represents a group of alternative character parameters E g ON OFF101 1 lt SPD gt String Program Data String value consisting from more parts It is used for date time setting 1 A flag indicating a request for the valu
8. manual 24 M 192 AC DC Resistance load MEATEST The response is in the form of String Program Data and consists of two elements a code number and error message If all errors are read calibrator returns message 0 No Error In case of overflow the error queue the last error in the queue is 350 Queue overflow Also the earliest errors remain in the queue and the most recent error is discarded Example SYST ERR Error Queue The Error Queue stores error messages They are placed in a first in first out queue The queue is read destructively using the query command SYSTem ERRor to obtain a code number and errro message The query SYSTem ERRor can be used to read errors in the queue until it is empty when the message 0 No Error will be returned SYST REM This command places the instrument in the remote mode for RS232 operation All keys on the front panel except the ESC LOCAL key are disabled Note It is not possible to send or receive data over RS232 or Ethernet when the calibrator is not in remote mode SYST RWL This command places the instrument in the remote mode for RS232 operation All keys on the front panel are disabled SYST LOC This command returns the instrument in the local mode This command is for RS232 interface only I D instrument identification IDN This command returns the identification of the manufacturer model serial number and firmware revision The reply
9. related to the set value Specified accuracy is one year accuracy Resistance accuracy M 192A only up to 4700 Q 15 000 Q 99 9999 0 1 30 mo 100 000 Q 3 000 ka 3 001 KQ 30 00 ka 30 1 kQ 100 0 ka Internal voltmeter M 192A only fe x 1 0 299 9 V 0 196 0 2 V 0 2 0 2 V Frequency response M 192A Max AC DC difference 0 01 0 01 0 05 mia wes wx mia s 13 Ordering information options M 192 Vxxxx basic version 15Q 4700 2 M 192A Vxxxx extended version 15Q 300kQ Remote control M 192 V0xxx RS232 M 192 V2xxx IEEE488 Housing M 192 Vxx0x table version M 192 Vxx1x module 19 4HE Example of the order M 192A V2000 resistance load 150 300kQ IEEE488 bus table version Operation manual 28 M 192 AC DC Resistance load 14 Appendix A M 192 Menu structure Setup menu has following folders Load General Protected M 192 has two access levels for protected parameter s setting Calibration calibration laboratory Service service organization Access level is defined by used password MEATEST Load Function Resistance Current Power C P refresh Off One time 5s 10s 30s Continually C P dev 0 1 10 Ourput switch Random Fire Zero Crossing Meter Voltage Current Power General Beep
10. the SETUP CALIBRATION MENU BSP deletes last entered number ESC cancels last entered value cancels cursor keys function or leaves last set mode ENTER confirms set value or confirms selected item in MENU or activates cursor keys function Cursor key function is indicated with symbol T in right low corner of the display 4 Power switch Turns instrument AC power ON and OFF 5 Output On Off Connects disconnects selected resistance to the output terminals Connected output is indicated with green LED 6 Central ground terminal Terminal with symbol GND is connected with the housing PE Operation manual 8 M 192 AC DC Resistance load MEATEST 4 2 Rear panel On the rear panel there are located power supply connector interface RS 232 connector optionally IEEE488 connector and serial number plate forced ventilation holes power line entry power line fuse model plate RS 232 IEEE488 connectors nABWN MH 9 Operation manual MEATEST M 192 AC DC Resistance load 5 Operation 5 1 Standard mode After switching on load comes to standard mode Following information is shown on the display M 192 version HESSEN a In the upper row generated resistance in Q is displayed In the lower row mesaured voltage connected to the output terminals M 192A only is displayed New resistance value can be set using cursor keys or direct via numeric keybord Cursor keys are active after pre
11. 2A only This subsystem sets function of the load Keyword Parameters FUNCtion lt CPD gt RES POW CURR FUNCtion RESistance lt DNPD gt POWer lt DNPD gt CURRent lt DNPD gt FUNC lt CPD gt RES POW CURR This command sets the output function of the load e RES constant resistance output function Load simulates required resistance in Q e POW power output function e CURR current output function If query is sent calibrator returns active output function Example FUNC RES sets resistance output function FUNC the instrument returns RES POW or CURR FUNC RES lt DNPD gt This command sets the output resistance value lt DNPD gt Parameter represents the value of the output resistance expressed in Q Operation manual 22 M 192 AC DC Resistance load MEATEST If query is sent calibrator returns the value of output resistance using standard exponential format Example 110 1 Q is returned as 1 101000e 002 Example Resistance 230 562 FUNC RES 230 5 Note Command selects resistance output function FUNC POW lt DNPD gt This command sets the output power value lt DNPD gt Parameter represents the value of the output power expressed in W If query is sent calibrator returns the value of output power using standard exponential format Example 1101 W is returned as 1 101000e 003 Example Power 230W FUNC POW 230 Note Command selects power output f
12. M 1 92 AC DC Resistance Load Operation manual MEATEST gt LU JI M 192 AC DC Resistance load MEATEST Content 1 USE OF THE INSTRUMEN esrb dd WWS 4 2 CONTENTS OF DELIVERY ssscssssetssscsssenstssnsssendeccesssnstessessendassscsvsnssssendesoscs etsesaesseccsssvosseecticessseskevdoasevsutes 4 3 PREPARA TION FOR USE sisecsisecssscccsssacesnsstsonsseesscoassstecsscccedecssassassccesaccsvestssbecvesncesscdsensseosscsdeacsbenssseneseaye 5 3 1 POWER ON 5 nibii epe epe eee ced LA ne ide Ge ee 5 3 2 REPLACEMENT OF FUSE nep ie te ote eet tia diim EE 5 3 3 SAFETY PRECAUTIONS 3 ses oce c decide n eet e e ple th ceci e tee eee 6 4 DESCRIPTION sisssscscssccsvessscsecccsesceventsssonccsecstvedcescedsnesasexestescsestesssseebdasteestasssedenssssencssesevetesssoxsssanseseecessovesees 7 4 1 ERONTPANEE 4h cect etd JAGO AA Bence a AR eee hath wer ee ARA ee tine Ae ee eh 7 4 2 REAR PANEL ao ic eden Saw ec Sebi hv A EH e cor d pectine Uia ipee ee 9 5 L0 ure 10 5 1 STANDARD MODE 56 o A APA a EE tee reor ee p eue E prse 5 2 SETUP MODE BASIG RULES 222 258 Nette eine bb ui Bi breuis ae ee acne See 5 3 SETUP MODE OCET 6 3 1 Load configuration Instrument eese eene tenente wania 6 3 1 1 Simulated function F ncton 5 rn roter ette Et e Ee ete reri e breed 6 3 1 2 Refresh cycle for Current and Power function C P refresh sss 6 3 1 3 Deviation limit for Curre
13. culated resistance is changed one time 5s calculated resistance is changed stabilized 5 seconds after switching output On 10s calculated resistance is changed stabilized 10 seconds after switching output On 30s calculated resistance is changed stabilized 30 seconds after switching output On CONT calculated resistance is changed stabilized if measured value current or power differs from required more than C P dev Allowed deviation is defined in C P dev Parameter command CONF REFR DEV If query is sent instrument returns OFF 1x 5s 10s 30s or CONT according to selected multimeter method Example CONF VOLT OFF without refresh the output in current and power mode CONF DEV lt DNPD gt This command defines maximal allowed deviation for continual regulation in functions CURR current and POW power lt DNPD gt Parameter represents allowed deviation expressed in If query is sent calibrator returns the value of deviation using standard exponential format Example 1 is returned as 1 000000e 000 Example Deviation 2 CONF DEV 2 SYSTem subsystem The subsystem enables to control various functions from the MENU SYSTem ERRor REMote RWLock LOCal SYST ERR Query the instrument s error queue Detected errors are placed in the queue This query returns the first error from the queue The queue is type first in first out The error is deleted after reading Operation
14. e of the parameter specified by the command No other parameter than the question mark can be used A flag indicating a request for the parameter specified by the command This command permits a value to be set as well as requested lt cr gt carriage return ASCII code 13 This code executes the program line lt lf gt line feed ASCII code 10 This code executes the program line 21 Operation manual MEATEST M 192 AC DC Resistance load OUTPut subsystem This subsystem enables to activate or deactivate the instrument output Keyword Parameters OUTPut STATe lt CPD gt ON I OFF SYNChronization lt CPD gt ON OFF OUTP STAT lt CPD gt ON OFF This command activates or deactivates output terminals e ON activates the output e OFF deactivates the output If query is sent calibrator returns ON if the output is active or OFF if it is inactive Example OUTP ON activates the output OUTP the instrument returns ON or OFF OUTP SYNC lt CPD gt ON OFF This command how is the output of the load connected and disconnected e OFF without synchronization to the input signal e ON synchronized zero crossing output connection disconnection If query is sent instrument returns ON or OFF according to selected synchronization mode Example OUTP SYNC OFF selects output switching without synchronization to the input signal OUTP SYNC Calibrator returns ON or OFF FUNCtion subsystem M 19
15. eessentecss 20 9 2 RS232 SERIAL LNE SETTING n romaine Ter nma mae 20 9 3 COMMAND SYNTAX iicet l WO Rip gite ees EH te th edi i tee duin ty dates eee les 21 10 ELECTRIC FUNCTION Pm 26 LL SPECIFICATION jones OR 27 12 ACCURACY siew edia odda d eiiean eas ia or ai E o s eir E S iS 28 13 ORDERING INFORMATION OPTIONS ccssscssscssssscssscssssscssscessescssscsssescscssssescssssssssscssssessasees 28 14 APPENDIX A M 192 MENU STRUCTURE sss osocza ooo 29 3 Version 15 Operation manual MEATEST M 192 AC DC Resistance load 1 Use of the instrument AC DC Resistance Load M 192 is programmable resistance decade in range 15 000 Ohm to 300 kOhm It is designed as power resistance decade 3000W for testing AC DC power sources transformers or generally as resistance load Set resistance value is created via appropriate combination of physical resistors Actual set values are displayed on the front panel display M 192 is sophisticated instrument with its own re calibration procedure The procedure enables to correct any deviation in resistance without any mechanical adjusting Instrument is especially suitable for automatic testing procedures RS232 line optionally IEEE488 bus is used for connecting decade to the computer 2 Contents of delivery AC DC Resistance Load M 192 User s manual Power cable Test leads 2 pcs Test report Operation manual 4 M 192 AC DC Resistance load MEATEST 3 Preparation for use The ins
16. instruments on and let them for 1 hour stabilise in the laboratory with ambient temperature 2342 C Connect resistance decade terminals RAW to the standard ohm meter multimeter 2 Check resistance value in points according to Table I for M 192A full version also according to Table II Table I M 192 all versions maximal deviations Nominal value Q Max deviation mQ 15 000 45 50 000 80 100 000 100 600 00 600 1200 0 1200 4700 0 4700 Table II M 192A full version maximal deviations Nominal value kQ Max deviation Q 10 00 10 30 00 30 100 200 300 1500 19 Operation manual MEATEST M 192 AC DC Resistance load 9 System control The load is equipped with RS232 serial line as standard IEEE 488 bus is optional System connectors are located at the rear panel For the remote control to work properly interface parameters must be set in the system menu For RS232 line communication speed can be set 1200 to 19200 Bd For IEEE 488 bus an address from range 0 to 30 is allowed The calibrator can be only controlled by one of interfaces at a time It is therefore necessary to select one of the interfaces RS232 IEEE488 using the system menu 9 1 IEEE 488 bus properties The instrument performs the following functions based on IEEE488 bus commands SHI AHI T5 L3 RLI DCI SRI The instrument also recognizes the following general commands s 13 DCL De
17. is formatted as follows MEATEST M 192 100002 1 22 Clear status CLS This command clears the Error Queue 25 Operation manual MEATEST M 192 AC DC Resistance load 10 Electric function Resistance elements are switched to the output terminals through relays in binary code system The resistors are very stable power resistors with low temperature coefficient Resistors are mounted on the heat sink Metal housing is connected to the ground terminal PE only CPU unit with one chip micro controller generates all necessary internal control signals Calibration data and set up parameters are saved in EEPROM memory Operation manual 26 M 192 AC DC Resistance load 11 Specification MEATEST Only values functions ranges with signed accuracy in relative or absolute expression or where limits are specified are guaranteed Resistance range Resolution Temperature coefficient Maximal dissipation power Maximal voltage Connection of output terminals Frequency range Working mode Reaction time Terminals Interface Reference temperature Working temperature Storing temperature Housing Dimensions Weight Isolation resistance between output terminals and housing 15 Q 4700 Q basic version 15 Q 300 kQ version M 192A 0 1 O to 1 Q for M 192 version 0 001 to 1 k 2 for M 192A version lt 10 ppm C 1 Q 10 KQ lt 25 ppm C gt 10 KQ 3000 W 250 Vrms 2 4 wire 0 DC to 10 kHz
18. l internal temperature sensors Real temp 1 Real temp 2 Real temp 3 Real temp 4 Real temp 5 Real temp 6 Real temp 7 15 Operation manual MEATEST M 192 AC DC Resistance load 6 Calibration In this mode resistance elements of the decade and voltmeter M 192A only can be recalibrated Access to the calibration mode is enabled after entering correct password Please see chapter Protected area how to enter modify calibration password Calibration parameters are stored in EEPROM memory 6 1 Resistance calibration In Resistance calibration mode can be changed parameters of the resistance load For calibration is required ohmmeter with ranges 10 Q 200 MQ and required accuracy Table contains nominal values of calibration points and required recalibration accuracy m wa mo m a ama m a oma Note M 192 basic version contains resistance values R1 R9 only M 192A full version contains all resistances R1 R24 Process of calibration consists of measuring partial resistances and writting their actual values into the decade e Set the first calibration point resistance element Use keys 4 to select the element Operation manual 16 M 192 AC DC Resistance load MEATEST e Press ENTER key to confirm selected resistance e Press OUTPUT ON key to connect selected resistance to the output terminals e Measure resistance of the selected element Use ohm meter with appropriate accuracy in 4
19. nt and Power function C P dev sssessssssss t 6 3 1 4 Output On Off switching mode Output switch oo e eee eseeseeeeseeeceeteeeseeseeseeececsesseesesseeaeeeseeseeeaes 12 63 2 General settings General rte eth e I e e EO SE a OE 12 6 3 2 1 Beeper setting Beeps zza RZ POPOWE 12 6 3 2 2 Display setting Display i WO RENE OE ECA 13 6 3 2 3 Passwords setting User access esent eee teen hh rete aS 13 6 3 2 4 Language LANGUAGB 6 3 2 5 Device information INFO 6 3 2 6 Interface setting Interface 03 3 Protected area Protected s de ii tme th dd A R ad 6 3 3 1 Calibration constants Calibration ccccccccscccessccssscesseceseceseecesecesseceseeesseceseeeeseseseecsseeessseeeeesseeeseeens 14 6 3 32 Service Setting ServiGe oce reete e oi Ue b er Pe MR Asi J 14 6 CALIBRATION eT 16 6 1 RESISTANCE CALIBRATI N bvue ne tete pei pee ede ed edd tede ce a e ede 16 6 2 VOLTMETER CALIBRATION M 192A VERSION ONLY cc cccssssscecseceeecssececeesaececseeeecessneeeessaeeeeseeeeenees 17 7 ERROR MESSAGES ssa da e rse Santas diane estio o ess 18 8 PERFORMANCE VERIFICATION TEST ccsssscssscssssscssscssssssssscssssscssscsssscssssssssssssssssssscssssessesoes 19 9 SYSTEM CONTROL oco oda obe ee vL eb a Sa Wad Ode Bi oka SEO Eo odda 20 9 1 TEEE 488 BUS PROPERTIES sscccesssscecesssssecssseecesesscecsensssecssnseeecesnsecsensssesseneesessnsecsensssessenee
20. pushing OUTPUT ON OFF key for zero cross of connected voltage 100ms timeout This type of output switching reduces produced electromagnetic noise 6 3 2 General settings General General instrument s settings are in this item After pushing 1 key previous item Load is selected After pushing key next item Protected is selected After pushing ENTER key following menu is displayed 6 3 2 1 Beeper setting Beeps Configuration of generating sounds is in this item 6 2 2 1 1s Keyboard beep Keyboard One of following items can be selected a Off no sound is generated after pushing the key Operation manual 12 M 192 AC DC Resistance load MEATEST b On short beep is generated after pushing the key 56 52 1 Other beeps Others Sounds produced by the instrument except of keyboard can be switched a Off no sound is generated b On sound is generated 6 3 2 2 Display setting Display Configuration of display is in this item 06 3 2 2 1 Display backlight Backlight Item enables to set the backlight of the display One of following items can be selected Low High 6 3 2 2 2 Message display time Massage time Item enables to set the message display time One of following items can be selected Normal Long 6 3 2 3 Passwords setting User access Item enables to set user passwords 6 3 2 5 1 Calibration access password Cal password Item enables to set
21. r function C P refresh This item is available only in M 192A full version Item defines method of regulation the output in Current and Power function One of following modes can be selected a Off calculated resistance is not changed b One time calculated resistance is changed one time c 5 s calculated resistance is changed stabilized 5 seconds after switching output On d 10 s calculated resistance is changed stabilized 10 seconds after switching output On e 30 s calculated resistance is changed stabilized 30 seconds after switching output On f Continually calculated resistance is changed stabilized if measured value current or power differs from required more than C P dev Allowed deviation is defined in C P dev parameter 6 3 1 3 Deviation limit for Current and Power function C P dev This item is available only in M 192A full version Item defines maximal deviation for Current or Power in Continually refresh mode Output value is refreshed if measured deviation is higher Any value in range 0 1 to 10 0 can be entered 6 3 1 4 Output On Off switching mode Output switch Parameter defines how is the output of the load connected and disconnected One of following modes can be selected a Random Fire load is connected or disconnected immediatelly after pushing OUTPUT ON OFF key This type of output switching is fastest b Zero Crossing load waits after
22. rrors can be caused by e Incorrect control using the front panel i e attempts to force a prohibited mode e g setting an out of range value overloading of output terminals etc e Calibrator s fault Sample error message which appears is shown bellow The following table lists all error messages their meaning and simple troubleshooting Error message Description Load overheated Disconnect external source WARNING Ambient temperature is too high or forced Temperature over ventilation holes are blocked WARNING Fanner blocked Fan does not work Forced ventilation is blocked Internal error Turn the load off and after 5 s turn on If the error will appear again contact ERROR xx manufacturer Operation manual 18 M 192 AC DC Resistance load MEATEST 8 Performance verification test This chapter describes how to verify parametrs of the instrument Verification procedure is based on measuring resistance on the load output terminals with standard multimeter in recommended points Required equippment e Ohm meter nominal accuracy 0 01 in range 10 Q to 300 KQ type Agilent 34401A or similar Load setting Switch decade to the resistance function Connect standard multimeter to the decade output terminals Use four wire connection technique Range of the test e output resistance on terminals RAW checking Procedure Use following procedure to perform parameters verification test 1 Switch both
23. s Keyboard Off On Others Off On Display Backlight Low High Message time Normal Long User access Cal password Srvc password Language English Cesky Deutsch Info Serial number FW version Interface Active RS232 TEE488 RS232 BaudRate IEEE488 addr Protected Calibration R constant R1 Rxx Voltage U DC pos U DC neg U AC low U AC high Service View Fan speed Temp heat sink Temp others CPU firmware RE firmware 29 Operation manual MEATEST M 192 AC DC Resistance load Temp calibr Real temp A Real temp B Real temp C Real temp D Real temp Air Real temp Case Manufacturer MEATEST spol s r o tel 420 543 250 886 Zelezna 509 3 619 00 Brno fax 420 543 250 890 Czech Republic meatest meatest cz www meatest com Operation manual 30
24. ssing ENTER key Numeric keyboard is active after pressing ESC key Use of cursor keys Cursor keys are active after pressing ENTER key Function of cursor keys depends on the version of the load M 192 basic version There is certain number of different resistance values 64 in range 15 000 to 4700 Q Cursor keys T V switch between these discrete values and increase or decrease resistance value Cursor keys lt gt are not used M 192A full version Any value in range 15 000 Q to 300 KQ can be set Cursor keys T 4 increase or decrease resistance value Cursor keys lt lt change the cursor position Numerical keyboard Operation manual 10 M 192 AC DC Resistance load MEATEST Numeric keys are active after pressing ESC key New resistance value can be entered directly using numeric keys New value is settled after pushing ENTER key BSP key deletes last entered number M 192 basic version M 192A full version 5 2 Setup mode Basic rules In the Setup mode can be changed parameters of the resistance load Parameters are atored in EEPROM memory Setup menu is organized as tree type structure Meaning of keys is Po ha parameter selection ENTER confirmation of selected parameter ESC return one level back Parameter s value is displayed in square brackets 50 652 Q In this mode is not possible to change displayed value Parameter should be switched to the edit mode Edit mode is entered
25. trument should be powered by 100 240 V 50 60 Hz mains Before powering on the instruments place it on a level surface Do not cover the vents at the bottom top sides and the fan opening at the rear panel Parameters of this instrument are guaranteed at 23 5 C 3 1 Power on e Plug one end of the power cord into the connector located at the rear panel and connect the other end of the power cord into a wall outlet e Switch on the mains switch located at the front panel Display is lit e The resistance load performs internal hardware checks for 5 seconds Configuration of the instrument is displayed in the end of this test version M 192 or M 192A e After the tests conclude instrument resets to its reference state i e the following parameters are set Function Resistance Set value 100 Q Output terminals OFF 3 2 Replacement of fuse Resistance load includes a fuse located near the mains connector at the rear panel Replace the fuse as follows e Switch off the instrument e Remove the end of power cord from the mains connector at the rear panel e Release the fuse using flat screwdriver and pull out the fuse holder e Remove the fuse and replace it with new fuse of the same rating 5 Operation manual MEATEST M 192 AC DC Resistance load 3 3 Safety precautions The instrument has been designed in Safety Class I according to EN 61010 1 The design reflects the requirements of A2 amendment of the standard Safety
26. unction FUNC CURR lt DNPD gt This command sets the output current value lt DNPD gt Parameter represents the value of the output current expressed in A If query is sent calibrator returns the value of output current using standard exponential format Example 2 A is returned as 2 000000e 000 Example Current 2 5A FUNC CURR 2 5 Note Command selects current output function MEASure subsystem This subsystem allows controling the internal multimeter Keyword Parameters MEASure VOLTage CURRent POWer MEAS VOLT This query returns value measured by the voltmeter Example MEAS VOLT Instrument returns measured value MEAS CURR This query returns value measured by the voltmeter and converted to current 23 Operation manual MEATEST M 192 AC DC Resistance load Example MEAS CURR Instrument returns measured value MEAS POW This query returns value measured by the voltmeter and converted to apparent power Example MEAS POW Instrument returns measured value CONFigure subsystem This subsystem allows setting instrument s basic parameters Keyword Parameters CONFigure REFResh lt CPD gt OFF I 1x I 5x I 10x 30x CONT DEViation lt DNPD gt CONF REFR lt CPD gt OFF 1x 5x 10x 30x CONT This command defines method of regulation the output in Current and Power function One of following modes can be selected OFF calculated resistance is not changed 1x cal
27. vice Clear reset the calibrator SDC Selected Device Clear reset the calibrator aor ARA EOI End or Identify Message Terminator close the message Dios DIOS GTL Go To Local close remote control mode D GND TW PAR WAV LLO Local Lock Out local control locked GND TW PAIR W NRFD GND TW PAIR W NDAC GND TW PAIR W IFC GND TW PAIR W SRQ GND TW PAIR W ATN SIGNAL GROUND nininini l 2 0 N s o e a a o ATN SHIELD e 9 2 RS232 serial line setting To transfer the data using RS232 bus 8N1 data format is used i e each data word includes 8 bits no parity and one stop bit The communication speed can be set using the system menu Available values 1200 2400 4800 9600 and 19200 Bd RS 232 connector layout 4 5 Pin Name Direction Description 00000 i GRY 2 TXD Output Transmitter 6 39 3 RXD Input Receiver 5 GND Ground 9 pin connector D SUB FEMALE Cable between the calibrator and PC configuration 1 1 PPC D Swi1 D Su2 Calibrator Receiver mamme SSCS 5 Reg 2 3 5 Ground 5 oon Operation manual 20 M 192 AC DC Resistance load MEATEST Note It is not possible to send or receive data over RS232 when the calibrator is not in remote mode You should use the command SYST REM or SYST RWL 9 3 Command syntax The commands described in this chapter can be issued through all buses RS232 IEEE488 All commands
Download Pdf Manuals
Related Search