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MEATEST 

 

 M-140 Multifunction Calibrator

 

Operation manual v46                                                                                 

             73

 

Functional description of the calibrator 

 
 

Basic blocks

 

 
Basic functional blocks are: 
  

•

 

front panel keyboard 

•

 

LCD display 

•

 

output terminals 

•

 

output voltage amplifier 200 V 

•

 

output voltage amplifier 20 A 

•

 

main board 

•

 

voltage amplifier 2 V 

•

 

voltage amplifier 20 V 

•

 

DC reference voltage with  DAC 

•

 

generator 

•

 

feedback circuits 

•

 

phase shift circuits 

•

 

current ranges generator 

•

 

multimeter 

•

 

power line transformer 

•

 

power supply board 

•

 

interface GPIB and RS232 

 
 

 

Summary of Contents for M-140

Page 1: ...M 140 Multifunction Calibrator Operation manual ...

Page 2: ......

Page 3: ... relative deviation 16 Change of value by factor of ten 17 Connection disconnection of output terminals 17 Setting the frequency 18 Generation of calibrated voltage 19 Generation of calibrated current 21 Generation of non harmonic shapes 22 Simulation of resistance and capacitance 23 Generation of electric power and energy 26 Generation of frequency 31 Simulation of temperature sensors 34 Multimet...

Page 4: ...tructures 104 Examples of use 107 Calibration of measurement instruments 107 Multimeters 107 Powermeters 109 Counters and oscilloscopes 111 Thermometers 111 Measurement 112 Voltage current and frequency 112 Measurement of resistance or temperature using resistance temperature sensors 113 Measurement of temperature using thermocouples 114 Strain gauge sensors for non electrical values 114 Testing o...

Page 5: ...value Frequency ranges of the calibrator can generate a squarewave signal with definable and calibrated duty cycle and amplitude in the 1 mV to 10 V range and 0 to 10 kHz frequency range Moreover squarewave signal with very steep rising edge can be generated up to 20 MHz Frequency ranges can be used to calibrate the corresponding frequency ranges of multimeters as well as to calibrate the input se...

Page 6: ...M 140 Multifunction Calibrator MEATEST 4 Operation manual v46 ATTENTION The calibrator generates life threatening high voltage The calibrator can only be used in line with this Manual ...

Page 7: ...the rear panel 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 Switch on the mains switch located at the rear panel Flat display is lit The calibrator performs internal hardware checks for 5 seconds After the tests conclude the calibrator resets to its reference state i e the following parameters are set Fun...

Page 8: ...l out the fuse holder Remove the fuse and replace it with new fuse of the same rating 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 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 ...

Page 9: ...led within allowed limits on the display The keyboard includes two buttons which allow the cursor to be set to the required position at the display The cursor can be moved to the left or right These buttons are usually used to step through the options and to move from one option to another or between the menu levels Numeric values can be set in some control modes as well In these cases the buttons...

Page 10: ...DC AC current I AC resistance capacitance R C power energy P E frequency F internal multimeter METER simulation of temperature sensors T After the function mode is changed the parameters of the respective function are restored If the respective function was never used the calibrator resets to its reference values Reference values for individual functions are listed below Function Value Parameters ...

Page 11: ... to Hi Lo terminals GND terminal is connected to the chassis of the calibrator It is connected to the ground terminal of the mains plug Using the SETUP MENU of the calibrator the output terminals of the calibrator can be grounded as well Grounding is done internally by connecting Lo and GND terminals using a relay This circuit design is suitable for most calibrations when the object multimeter bei...

Page 12: ... adapter 14 0V5MER common terminal of multimeter power supply source 15 NC not used 16 SIMHI RC simulator output current terminal Hi Umax 10Vpp Imax 40mA 17 SIMHU RC simulator output voltage terminal Hu Umax 10Vpp Imax 40mA 18 NC not used 19 INP multimeter input terminal for voltage current ranges Umax 25 Vpp Imax 25 mA 20 U high output terminal for DC voltage range Umax 20 Vss 21 I high output te...

Page 13: ...output signal if a non zero relative deviation is set c Main data This line displays the main data of the output signal and the unit of measurement using double size signs The line also includes two symbols to define the actual position of the cursor during adjustment of the value buttons can be used to move the cursor and buttons to change the value The value can be also changed using the potenti...

Page 14: ...l The value is calculated using the main specification listed in the User s Manual and it is displayed in 2 INPUT section This section displays the values measured by the multimeter The section includes following data a Main value of measured signal This line displays the measured value and the unit of measurement If the input signals exceed the permitted range OVERFLOW is displayed b Designation ...

Page 15: ... holes power cord socket with fuse mains voltage selector mains switch IEEE 488 connectors for connection to GPIB bus and type plate with serial number 1 air inlet forced ventilation 2 air outlet forced ventilation 3 GPIB RS 232 connectors 4 power cord socket with fuse mains voltage selector mains switch 5 type plate 5 1 2 4 3 ...

Page 16: ...sent at the input terminals depending on the function mode of the multimeter The measurement is only possible when any of Opt 140 xx adapters is connected to the AUXILIARY connector 4 Entry to the setup menu After pressing the SETUP button options of the SETUP MENU appear on the display and the display buttons allow the entry to the calibration mode CALIB or entry to the mode when the calibrator i...

Page 17: ... display now includes cursor marks which point to the active digit turn the knob to change the active digit press the potentiometer knob to change to the mode which allows to change the value of the active digit and symbols are displayed above the active digit Active digit can be changed by turning the knob turn the knob to change back to the mode which allows to change the position of the active ...

Page 18: ... on the display displays the total value of output signal including the unit of measurement the value of the signal at output terminals is the value indicated by the main display Maximum relative deviation which can be entered is 30 000 The deviation can be positive or negative If negative deviation is desired press the display button labeled If positive deviation is then desired press button agai...

Page 19: ... change of internal range only in U I P E modes If the change results in overflow or underflow of calibrator s range an error message appears Value too large if the resulting value is too large Value too small if the resulting value is too small Range change Press the display button labeled x10 if you want to increase the range 10 to decrease the range The main value shown on the display is increa...

Page 20: ...nt mode by pressing U I AC buttons or selecting the P E mode using the display Frequency value f xxx xx Hz appears in the minor data section of the display f symbol is displayed above one of the display buttons After f display button is pressed _ _ _ _ _ _ _ symbols appear below the frequency value Numeric keyboard can be used to enter the desired value Press Hz or kHz to confirm the value The val...

Page 21: ...in the voltage mode Press U button on the calibrator and then select AC or DC mode by pressing DC AC button The display shows the following data main data of set voltage relative deviation uncertainty of output voltage frequency when AC voltage is generated total value of output voltage when non zero relative deviation is set Set the desired value of voltage including polarity when necessary frequ...

Page 22: ...isconnected when changing between AC and DC ranges or when changing the function mode Using AUTOCAL function To remove the effect of short term drift and temperature dependency of small DC voltages AUTOCAL function can be used It can only be activated in the calibration mode Calibration mode lists the respective procedure Overloading of terminals If the output terminals are overloaded or short cir...

Page 23: ...urrent when non zero absolute or relative deviation is set time after which the output terminals will be disconnected when the output current over 10 A is selected Set the desired value of voltage including polarity when necessary frequency and relative deviation The signal is yet not connected to the output terminals The information section of the display shows the symbol which informs about the ...

Page 24: ...duty cycle PWM NEG squarewave negative with adjustable duty cycle RAMP A ramp symmetrical positive RAMP B ramp symmetrical negative TRIANGLE triangular symmetrical LIM SINE harmonic with amplitude limitation truncated sin Generation of non harmonic signals has some limitations non harmonic voltages can be generated in the 0 1 Hz to 1000 Hz frequency range non harmonic currents can be generated in ...

Page 25: ...isplayed on the display If Option 70 is connected label CA 140 70 is displayed in the right side If Option 140 41 is connected label CA 140 41 is displayed Cable adapter Option 70 can be used for four wire connecting of simulated resistance only In compare with direct two wire connection through output terminals Hi Lo accuracy of resistance is better with Option 70 see Technical data If Cable adap...

Page 26: ...tion Keep pressing the center cursor button until _ _ _ _ _ _ _ symbols appear under the relative deviation value xx xxxx The value can be set using numeric keyboard potentiometer or cursor buttons Confirm the value by pressing display button or by pressing ENTER Limitations resulting from electronic simulation Electronic simulation of resistance and capacitance allows setting of a wide range of v...

Page 27: ...ator Operation manual v46 25 Frequency dependence of resistance and capacitance Electronic simulator of resistance can be used with DC and AC test signal Electronic simulator of capacitance can be used in AC range from 20 Hz to 1000 Hz ...

Page 28: ... data main value of set power in selected unit of measurement VA W VAr power factor value PF in negative polarity LA or positive polarity LE or the phase shift between the voltage and current in frequency if AC power is selected voltage at Hi Lo terminals current through I I terminals uncertainty of set power Set desired value of power using numeric keyboard potentiometer or cursor buttons Output ...

Page 29: ...alibrator can display the phase relation of output voltage and current as power factor 1 to 1 or as phase shift in degrees 0 to 360 SETUP setup menu is used to change the method of displaying the phase relation Power setting modes The calibrator allows several ways of setting the value of generated power 1 Setting the main power value The main value can be changed using numeric keyboard changing t...

Page 30: ...ons or potentiometer as well Main power value is recalculated using new set voltage and existing setting of current and power factor 3 Setting the current The main power value can be changed by changing the current Select P E mode and then keep pressing the center cursor button until _ _ _ _ _ _ _ symbols appear under the current I xx xxxx A The value can be set using numeric keyboard and confirme...

Page 31: ...w set power factor and existing setting of current and voltage The calculation is only made if active or reactive power is displayed In the power generation mode relative deviation cannot be set If the power factor is set to define the phase relation of voltage and current confirmation of entered value by pressing LA button means positive phase LE means negative phase Setting the energy Keep press...

Page 32: ... can also be confirmed by pressing ENTER Energy value is recalculated using new set time Grounding of the calibrator and the instrument to be calibrated in the P E mode When calibrating the power and energy meters with separate voltage and current circuits it is advisable to select GND U ON and GND I ON both grounding methods on on the M 140 calibrator This setting will ground both the current and...

Page 33: ...quency and duty cycle Frequency range is up to 10 kHz The second mode HF also provides squarewave output signal with very steep rising edge typically less than 3 ns PWM mode Frequency range 0 1 Hz to 100 kHz Voltage range 1 mV to 10 Vpp Signal shapes squarewave negative PWM NEG symmetrical PWM SYM positive PWM POS HF mode Frequency range 0 1 Hz to 20 MHz Voltage range 5 Vpk pk 0 10 20 30 dB Signal...

Page 34: ...is 5 mA In other voltage ranges maximum load is 0 1mA If the output is overloaded the set value is not guaranteed The output is short circuit proof The outer casing of the connector is electrically connected to the chassis of the calibrator Setting relative deviation Keep pressing the center cursor button until _ _ _ _ _ _ _ symbols appear under the relative deviation value xx xxxx The value can b...

Page 35: ...can be set in steps of 0 10 20 30 dB Select the frequency mode and keep pressing the center cursor button until _ _ _ _ _ _ _ symbols appear under the attenuation value a x xxx dB Set the value using numeric keyboard and confirm by pressing dB display button or by pressing ENTER If other than permitted value is set the closest permitted value is used ...

Page 36: ...rresponding to set temperature sensor type and temperature of cold end of thermocouple is connected to Hi Lo terminals Simulated values of temperature sensors are also available at the AUXILIARY connector Thermocouple voltage is available at U U terminals Four wire connection of resistance temperature sensors is provided by current terminals PTLI PTHI and voltage terminals PTLU PTHU 140 41 cable a...

Page 37: ...to be calibrated to Hi Lo terminals Press OUTPUT button Red LED is lit above the OUTPUT terminal to indicate that the output signal is connected to output terminals The display shows the symbol of connected output terminals Note Load of output terminals is limited similarly to corresponding voltage or current ranges Output signals provided at Hi Lo terminals and AUXILIARY connector are short circu...

Page 38: ...y pressing ENTER Note After the calibrator is switched on or before the first change of the coefficient R0 is set to 100 This setting corresponds to Pt 100 resistance thermal sensor Entry of cold junction temperature For thermocouples the temperature of cold junction can be entered The entry is performed by setting the RJ field in the auxiliary data section of the display Select the thermocouple m...

Page 39: ...fects of short term drift and thermal dependency of the simulation AUTOCAL function can be used It can only be activated in the calibration mode Procedure is following Use a display button to enter the calibration menu Enter the calibration code and confirm by pressing ENTER Use the cursor buttons or potentiometer to select the AUTOCAL function from the calibration menu After the function is activ...

Page 40: ...ontrol button After the button is pressed SETUP METER menu opens which allows to set up the multimeter Press EXIT display button to return to previous menu Press or cursor button to browse the menu options Active option is always inverted The parameters of the active option can be changed if the respective function is allowed to be changed Use UP DOWN CLR NEXT and display buttons to change the par...

Page 41: ... the menu using cursor buttons Press UP DOWN display buttons or use the potentiometer to select the measurement range for selected function Ranges of individual functions can be changed small DC voltages mV DC ranges 20 200 2000 mV temperature measurement using thermocouples T TC types K N R S B J T E temperature measurement using RTD sensors types Pt 1 385 Pt 1 392 setting of sensitivity of strai...

Page 42: ...o 15 kHz Hz temperature measurement using thermocouples C temperature measurement using resistive temperature sensors C measurement of strain gauge sensors mV V Use of calculation formula Each function of the multimeter can display recalculated measured value The value shown on the display is always calculated according to the formula Y A0 A1 X A2 X2 where X is the value measured by the multimeter...

Page 43: ...sing RTD sensors R0 resistance at 0 C can be set when measuring the temperature using TC sensors the temperature of cold junction can be set and when measuring using SGS sensors supply voltage of the bridge can be set Original settings are listed below T RTD R0 100 T TC RJ 23 C SGS Voltage 5 V The parameters can be changed as follows Press METER direct control button and select a function then use...

Page 44: ...t range is exceeded OVERFLOW message is displayed 140 41 Cable adapter must be used to connect the signal Zero function The multimeter has a zeroing function It can be activated after the measurement was activated by pressing INPUT direct control button Zeroing is performed by pressing METER direct control button After the button is pressed most recent value is stored and subtracted from all ongoi...

Page 45: ...The fuse can be replaced after turning the cap of the fuse holder The procedure is described in the adapter s manual The multimeter can be used as a DC milivoltmeter with 20 mV 200 mV 2 V 10 V ranges The appropriate input terminals are PTHU and PTLU Maximum allowed voltage on the input terminals against ground terminal is 20 V Frequency measurement is possible up to 15 kHz Input signal must be wit...

Page 46: ...urement OUTPUT 140 41 function is set to PANEL Calibrator s output signals are only available at the terminals located at the front panel in full ranges and can be fully used Calibrator s output signals are not available at the terminals of the cable adapter The multimeter can be used without limitations and in full ranges SGS sensors cannot be connected 140 41 cable adapter connected to calibrato...

Page 47: ...ed failed The time between individual steps can be set as well Basic menu Press SETUP display button to enter the Tester mode After the button is pressed the bottom line of the display shows TESTER option Press the respective display button to open the menu of test programs The menu includes a sequence number of the test program date of creation and program name Use the cursor buttons or the knob ...

Page 48: ...displayed above the table xx ERRORS along with the designation of performed test After reviewing the results of the test press EXIT display button to return to the previous level The test can be interrupted by pressing CANCEL button Programming the test Test procedures can be programmed after you select a procedure in the basic Tester menu and press SELECT display button The calibrator displays a ...

Page 49: ... the header of the programming table Input column The values in the table change when the type of the input signal is changed Number of test steps can be set by pressing STEPS display button in the range 1 to 10 Set number of steps is displayed in the header of the programming table Steps column The number of the rows in the table changes when the number of steps is changed You can select the line...

Page 50: ...e of input signal and output signal can be used It is impossible to switch to other function of the calibrator in the middle of a program Setting the relays SWITCH POLARITY and SWITCH ACTIVITY items of SETUP MENU are used to set up the relay The following table lists the states of the relay depending on the values of SWITCH POLARITY SWITCH ACTIVITY and the test result SETUP MENU RELAY BEFORE TEST ...

Page 51: ...ff Setup menu offers the following options 1 Coil x50 xx ON OFF This parameter can be set on when 50 turn current coil is going to be used for clamp ammeter calibration The coil multiplies the output current OFF is set by the manufacturer 2 GND U xx ON OFF This parameter connects Lo terminal to GND In practice this means that Lo terminal is grounded By pressing the display buttons the terminal can...

Page 52: ... the front panel 8 Meter average xx UP DOWN Displays the number of measurements taken before the average value of build in multimeter is displayed integration constant UP DOWN display buttons can be used to select a value in the range of 1 to 20 The higher the value the longer the calibrator needs to measure a value but displayed value is more stable If 20 is set one measurement takes approximatel...

Page 53: ...e potentiometer If ON is set the potentiometer can move the cursor both to the left and right and symbols and up and down and symbols If OFF is set the potentiometer can move the cursor up and down only and symbols 17 Switch polarity xx ON OFF This parameter controls the function of the built in relay If ON is set the relay is closes before the test If OFF is set the relay is opens before the test...

Page 54: ...nth year The parameter cannot be changed as it is automatically recorded when leaving the calibration mode 21 Serial No xxxxxx Displays the serial number of the calibrator The parameter cannot be changed 22 Time xx yy Displays real time The parameter can be changed using HOUR UP HOUR DO MIN UP MIN DO display buttons 23 Date xx yy zzzz Displays real time The parameter can be changed using DAY UP MO...

Page 55: ...zero and slope of the scale in all ranges at 1000 Hz except the 1000 V range where the calibration is performed at 500 Hz DC current calibration is performed by setting the zero and slope of the scale in all ranges and in both signal polarities and AC current calibration is performed by setting the zero and slope of the scale in all ranges at 1000 Hz except the 20 A where the calibration is perfor...

Page 56: ... connected any of cable adapters or with connected cable adapter Option 40 Option 60 and Option 70 If cable adapter Option 140 01 or Option 140 41is connected to the AUXILIARY connector access to calibration mode is not permitted Calibrator will display message Err 9 Bad cable adapter If an attempt is made to access the calibration procedure within 60 minutes after the calibrator was switched on t...

Page 57: ...nce calibration 9 FREQUENCY Amplitude in frequency mode calibration 10 ANALOG INPUT Multimeter calibration 11 AUTOCAL DC voltage offset correction Selection of calibration type After the calibration menu is displayed one of partial calibrations can be selected Use and cursor buttons to move the cursor through the list Having selected the required function to be calibrated press SELECT display butt...

Page 58: ...andard output value is reached press WRITE to write new calibration value to the calibration memory If you press SKIP button the calibrator ignores the new value and old value is retained After you press WRITE or SKIP the calibrator moves on to the next calibration point The procedure is repeated for all calibration points of the selected function If you press EXIT button before completing the cal...

Page 59: ...GE AC CURRENT DC CURRENT AC POWER AC POWER DC F functions the signal value is set using the keyboard For R C functions and partially also during the calibration of the multimeter calibration data of the range resistances must be entered T function does not require any calibration as the output voltage or resistance is based on arithmetic interpolation using standard tables of temperature sensor va...

Page 60: ...libration 19 100 u 20 slope calibration 19 100 u 20 slope calibration 0 0 200 u 200 zero calibration 0 0 200 u 200 zero calibration 190 600 u 200 slope calibration 190 600 u 200 slope calibration 1000 20 m 1000 slope calibration 1000 20 m 1000 slope calibration Table DC VOLTAGE VOLTAGE AC function nominal value V set limits V range V recommended frequency Hz 1 9 m 5 u 20 m 1000 19 m 10 u 20 m 1000...

Page 61: ... m 2 u 200 m slope calibration 190 m 2 u 200 m slope calibration 0 0 20 u 2 zero calibration 0 0 20 u 2 zero calibration 1 9 50 u 2 slope calibration 1 9 50 u 2 slope calibration 0 0 300 u 20 zero calibration 0 0 300 u 20 zero calibration 10 600 u 20 slope calibration 10 600 u 20 slope calibration Table DC CURRENT CURRENT AC function nominal value A set limits A range A recommended frequency Hz 19...

Page 62: ...ibration 0 0 50 u 2 zero calibration 1 9 200 u 2 slope calibration 1 9 200 u 2 slope calibration 0 0 200 u 10 zero calibration 0 0 200 u 10 zero calibration 10 1 m 10 slope calibration 10 1 m 10 slope calibration Table DC POWER POWER AC function AC current calibration nominal value A set limits A range A recommended frequency Hz 1 9 m 400 n 20 m 120 19 m 2 u 20 m 120 19 m 2 u 200 m 120 190 m 20 u ...

Page 63: ...10 40 k 200 k 500 k 20 200 k 1 M 200 k 20 200 k 1M 1 M 100 200 k 1M 2 M 200 1M 4 M 1 M 200 1M 4 M 4 M 1 k 1M 4 M 10 M 2 k 4 M 20 M 4 M 2 k 4 M 20 M 20 M 10 k 4 M 20 M 20 M 20 k 20M 50 M 50 M 50 k 20M 50 M Table R Calibration in resistance range of calibration points from 0 Ω to 100 kΩ must be done using Option 70 cable adapter four terminal connection Four wire output resistance is defined at the ...

Page 64: ... 10 1 m 10 slope calibration Table F ANALOG INPUT multimeter function voltage current resistance calibration nominal value set limits range note cable adapter 0 V 50 u 10 V zero calibration Option 40 10 V 200 u 10 V slope calibration Option 40 0 mA 50 nA 20 mA zero calibration Option 40 19 mA 500 nA 20 mA slope calibration Option 40 0 5 m 200 zero calibration Option 60 100 5 m 200 slope calibratio...

Page 65: ...en CALIB display button to call up the calibration menu 3 Enter the calibration code and press ENTER default calibration code is 00000 4 DC voltage ranges calibration a Connect the voltage input terminals of the multimeter to the Hi Lo output terminals of the calibrator b Select VOLTAGE DC from the calibration menu and confirm by pressing SELECT button Switch M 140 output terminals ON c Follow the...

Page 66: ...y button If you want to skip the calibration point whose calibration you have already entered press SKIP display button e Resistance shunt should be used on 2A 20 A ranges if standard multimeter does not cover this range 7 AC current ranges calibration a Select CURRENT AC from the calibration menu Set the same function on external multimeter b Follow the instructions provided on the calibrator s d...

Page 67: ... on the external multimeter by adjusting the calibrator s output If the entry of measured value to the calibrator is required VALUE METER is displayed at the respective calibration point The value on the calibrator s display has the same format as the nominal value of the respective calibration point on the display If on the other hand the user is requested to adjust the calibrator s output to set...

Page 68: ...ator s output to set the nominal value of the calibrator s measurement range on the external multimeter VALUE is displayed at the respective calibration point The value on the calibrator s display has general format a Select CAPACITANCE from the calibration menu Select GND U OFF and GND I OFF from the setup menu b Adjust the values of shorted and open terminals of the external RLC meter set the fr...

Page 69: ...e taken into account the fact that the precision of the calibration can be insufficient An 81 2 digit multimeter is recommended for calibration a 10 V DC voltage range calibration Connect adapter Option 40 to the AUXILIARY connector on the front panel Select ANALOG INPUT from the calibration menu Press SELECT display button to select the first calibration point 0 mV Make short on adapter Option 40...

Page 70: ...ton to write new calibration value Terminals of multimeter will switch OFF Disconnect both the external and built in multimeter Disconnect cable adapter Option 40 from the AUXILIARY connector c 100 Ω resistance range calibration Calibration of both resistance points 100 and 1000 consists of following steps 0 calibration Range resistance calibration For calibration of resistance ranges external sta...

Page 71: ...tabilizes press WRITE display button to write new calibration value Connect external standard multimeter set to the mVDC function to the Hi Lo output terminals Use test wires from basic delivery Connect HU test wire of cable adapter to the Hi terminal on the calibrator and LU test wire of cable adapter to the Lo terminal on the calibrator Both build in meter and external multimeter are in parallel...

Page 72: ...ted only one option OFFSET ACAL is provided Press SELECT display button to confirm the option The calibration includes two steps During the first step Hi Lo terminals must be shorted Use a short cable to connect the terminals During the second step the calibrator requests the disconnection of Hi Lo terminals Follow the instructions provided on the display when requested to do so short calibrator s...

Page 73: ...ode e g setting an out of range value overloading of output terminals etc fault of the calibrator e g internal communication error during the communication between individual functional blocks incorrect control using the GPIB or RS 232 bus Below you can see a sample error message which appears when too large value is attempted to set up All error messages are displayed in the center of the display...

Page 74: ...ble adapter must be off Adapter isn t allowed for autocalibration Use another cable adapter or perform autocalibration procedure without cable adapter 25 Use cable adapter Attempt to start calibration without cable adapter Calibration of resistance output can be performed with adapter Option 70 Calibration of internal multimeter can be performed with cable adapters Option 40 and Option 60 30 Inter...

Page 75: ...ront panel keyboard LCD display output terminals output voltage amplifier 200 V output voltage amplifier 20 A main board voltage amplifier 2 V voltage amplifier 20 V DC reference voltage with DAC generator feedback circuits phase shift circuits current ranges generator multimeter power line transformer power supply board interface GPIB and RS232 ...

Page 76: ...M 140 Multifunction Calibrator MEATEST 74 Operation manual v46 ...

Page 77: ...put voltage present at Hi and Lo terminals is sensed by sensing wires Feedback eliminates the influence of amplifier s output impedance and of the resistance of wires within the calibrator 200 V DC voltage range The block diagram functional scheme is shown in the picture below The scheme is similar to 2 and 20 V ranges A 240 V power amplifier with electronic fuses is connected to the output of 20 ...

Page 78: ...ltage ranges The output of the amplifier is fed to an inverting attentuator with 1 100 nominal division ratio The signal is then led to the output terminals sensed via local feedback This connection allows to load the calibrator output with output current of several mA without losing accuracy 1000 V AC DC voltage range The highest voltage range of the calibrator uses 200 V amplifier It is connecte...

Page 79: ...utput stage is push pull in B class Resistance and capacitance simulator Resistance and capacitance are simulated using electronic simulator The Hi and Lo terminals are calibrator s output terminals The stage including U1 operating amplifier converts voltage to current U2 is a separation amplifier R1 to R5 and C1 to C3 are range impedance DA converter has 0 to 1 and 0 to 1 conversion ration and al...

Page 80: ...wer factor if AC mode is set Output voltage is obtained from 200 V AC voltage range Output current is obtained from 2 or 20 A current range The output current generator is independent of the output voltage generator and synchronized by the microprocessor s crystal oscillator There is a phase shift between the signals of the output current generator and output voltage generator according to the set...

Page 81: ...he setup menu to ground Lo output terminal GND U ON setup function Do not overload the power stages by leaving the calibrator switched on with the load connected for a long time especially on 20 A current range and 200V and 1000 V voltage ranges If the instruments to be calibrated are not connected to calibrator s output terminals using original cables ensure that cables suitable for the calibrati...

Page 82: ...graded insulation etc In this case contact the manufacturer Sometimes it seems that the calibrator has hidden defect when the rules for correct operation are not adhered to In this case the fault is caused by the operator Most frequent cases of false hidden defects mains voltage out of tolerance limits or unstable wrong grounding of the measurement circuit bad connection of the ground terminal of ...

Page 83: ...ess influence of noise or interference with power line frequency in measuring circuit it is recommended following setting of the calibrator in SETUP MENU Coil x50 OFF GND U ON in capacitance test OFF GND I ON in capacitance test OFF Note It is recommended to ground only the voltage channel GND U ON GND I OFF for all ranges except the generation of power or energy If the meter to be calibrated has ...

Page 84: ...hed on for at least one hour in a laboratory at 23 1 o C 2 Perform ACAL procedure see chapter Calibration mode 3 Connect voltage input of the standard multimeter to the voltage output terminals of the calibrator Set appropriate parameters on the standard multimeter to achieve its best accuracy 4 Perform 20 VDC linearity DC voltage 20 VAC linearity AC voltage tests according to the tables I II III ...

Page 85: ...0 V DC range on build in meter according to the table XIII 20 Perform multimeter test in points FREQUENCY 1000Hz and 10 VDCV Deviations should not exceed limits in the tables below Note Because accuracy of calibrator output is not accurate enough in all points use external standard counter frequency or multimeter DC voltage connected in parallel to the output terminals to obtain exact value on the...

Page 86: ...0 VAC frequency 1000 Hz and sin waveform 30 Check harmonic distortion of output signal It should not exceed 0 05 If calibrator is out of limits is in some points of this test appropriate function and range should be recalibrated It is not necessary to recalibrate all functions but only this one which does not meet specification See chapter Calibration mode where recalibration procedure is describe...

Page 87: ...14 0 0 004 V DC 20 0 V 16 0 0 004 V DC 20 0 V 18 0 0 004 V DC 20 0 V 19 0 0 004 Table I DC voltage test Function Range Value V Frequency Hz Deviation allowed value V DC 2 0 V 1 9 0 004 V DC 2 0 V 1 9 0 004 V DC 240 0 V 190 0 0 004 V DC 240 0 V 240 0 0 003 V DC 240 0 V 190 0 0 004 V DC 240 0 V 240 0 0 003 V DC 1000 0 V 1000 0 0 010 V DC 1000 0 V 1000 0 0 010 Table II 20 V AC Basic range with linear...

Page 88: ... 0 mA 0 02 0 040 A DC 200 0 mA 0 04 0 025 A DC 200 0 mA 0 06 0 020 A DC 200 0 mA 0 08 0 018 A DC 200 0 mA 0 10 0 016 A DC 200 0 mA 0 12 0 015 A DC 200 0 mA 0 14 0 014 A DC 200 0 mA 0 16 0 014 A DC 200 0 mA 0 18 0 013 A DC 200 0 mA 0 19 0 013 A DC 200 0 mA 0 02 0 040 A DC 200 0 mA 0 04 0 025 A DC 200 0 mA 0 06 0 020 A DC 200 0 mA 0 08 0 018 A DC 200 0 mA 0 10 0 016 A DC 200 0 mA 0 12 0 015 A DC 200...

Page 89: ...requency Hz Deviation allowed value P 1 480W 480 60 0 07 P 0 5LA 480W 240 60 0 46 P 0 5LE 480W 240 60 0 46 P 1 2400W 2400 60 0 14 P 0 5LA 2400W 1200 60 0 77 P 0 5LE 2400W 1200 60 0 77 Table IX Voltage 240V Resistance test Function Range Value Ohm Frequency Hz Deviation allowed value O 4W 100 0 Ohm 10 0 DC 0 130 O 4W 100 0 Ohm 100 0 DC 0 015 O 4W 1000 Ohm 1000 0 DC 0 015 O 4W 10k Ohm 10000 0000 DC ...

Page 90: ...nction Range Value Hz Frequency Hz Deviation allowed value FREQ 1 kHz 1000 0 Hz 0 005 V DC 10 V 10 0 V 0 013 V DC 10 V 10 0 V 0 013 A DC 25 mA 0 019 A 0 017 A DC 25 mA 0 019 A 0 017 V DC 20 mV 0 019 V 0 057 V DC 20 mV 0 019 V 0 057 V DC 200 mV 0 19 V 0 024 V DC 200 mV 0 19 V 0 024 V DC 2 V 1 9 V 0 020 V DC 2 V 1 9 V 0 020 O 4W 200 Ohm 100 0 Ohm 0 030 O 4W 2 kOhm 1000 0 Ohm 0 021 Table XIII ...

Page 91: ... the following general commands DCL Device Clear SDC Selected Device Clear EOI End or Identify Message Terminator GTL Go To Local LLO Local Lock Out SPD Serial Poll Disable SPE Serial Poll Enable RS232 bus properties 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 Ava...

Page 92: ...ations DNPD Decimal Numeric Program Data this format is used to express decimal number with or without the exponent CPD Character Program Data Usually it represents a group of alternative character parameters E g ON OFF 0 1 A flag indicating a request for the value of the parameter specified by the command No other parameter than the question mark can be used A flag indicating a request for the pa...

Page 93: ...GH or HI50 SOURce subsystem This subsystem allows to control the individual functions of M140 calibrator Keyword Parameters SOURce FUNCtion SHAPe CPD DC SINusoid PULPositive PULSymmetrical PULNegative RMPA RMPB TRIangle LIMSinusoid PWMPositive PWMSymmetrical PWMNegative SQUare VOLTage LEVEl IMMediate AMPLitude DNPD CURRent LEVEl IMMediate AMPLitude DNPD RESistance LEVEl IMMediate AMPLitude DNPD CA...

Page 94: ... e switching between amplitude and amplitude PULNegative sets AC squarewave signal for voltage or current modes The amplitude and duty cycle can be set The rectangles are negative i e switching between amplitude and 0 RMPA sets AC output signal ramp shape for voltage or current modes The amplitude can be set The output switches between amplitude a amplitude RMPB sets AC output signal ramp shape fo...

Page 95: ...ts the value of the resistance in Ohms Technical Data chapter lists the acceptable ranges If query is sent M140 returns the set value of resistance using standard exponential format Example 20 5 is returned as 2 050000e 001 SOUR CAP LEVE IMM AMPL DNPD This command activates the generation of a capacitance DNPD Represents the value of the capacitance in Ohms Technical Data chapter lists the accepta...

Page 96: ...apter lists the acceptable ranges If query is sent M140 returns the set value of the voltage using standard exponential format Example 100 3V is returned as 1 003000e 002 SOUR POWE CURR LEVE IMM AMPL DNPD This command sets the amplitude of the current for power generation At the same time the power generation mode is set DNPD Represents the current expressed in Amperes used to generate the power T...

Page 97: ...r returns NONE when no cable adapter is connected or the type of cable adapter connected to AUXILIARY connector SOUR FREQ CW DNPD This command sets the frequency being generated Examples AC voltage frequency FUNC SIN VOLT DNPD FREQ DNPD cr AC current frequency FUNC SIN CURR DNPD FREQ DNPD cr Digital frequency FUNC SQU FREQ DNPD cr DNPD Represents the frequency in Hz Technical Data chapter lists th...

Page 98: ...s 2 00000e 001 SOUR TEMP UNIT CPD C CEL K This command sets the unit of measurement of temperature C or CEL sets Centigrade K sets Kelvin The unit of measurement remains valid after the calibrator is switched off If query is sent M140 returns the set unit of measurement C K SOUR TEMP SCAL CPD TS68 TS90 This command sets one of temperature scales The setting influences the simulation of resistance ...

Page 99: ...presents the temperature expressed in the units set by the UNIT command Technical Data chapter lists the acceptable ranges If query is sent M140 returns the set temperature using standard exponential format Example 20 5 C is returned as 2 050000e 001 SOUR TEMP PRT TYPE CPD PT385 PT392 NI This command sets the type of resistance temperature sensor to be simulated Example to activate the simulation ...

Page 100: ...ure RTD TEMPerature THERmocouple SGS OFF MEAS CONF VOLT This command selects the function VOLT range 0 12V of internal multimeter and switches it on Example to set the multimeter to DC voltage 10V measurement mode MEAS CONF VOLT cr MEAS CONF CURR This command selects the function CURR range 0 25mA of internal multimeter and switches it on Example to set the multimeter to DC current 20mA measuremen...

Page 101: ...eter sets the nominal resistance of the resistance temperature sensor to 0 C and switches the multimeter on 10 to 2k can be set DNPD Represents the nominal resistance in Ohms Example to set the multimeter to resistance temperature sensor Pt100 measurement mode MEAS CONF TEMP RTD NRES 100 cr If query is sent M140 returns the set value of nominal resistance using standard exponential format Example ...

Page 102: ...d power supply of sensor to 10V MEAS CONF SGS VOLT 10 cr If query is sent M140 returns the supply voltage of SGS using standard exponential format Example 15V is returned as 1 500000e 001 MEAS CONF OFF This command switches the multimeter off TESTer subsystem This subsystem allows to control features of M140 calibrator when used as tester It starts selected test procedure and reads its result Keyw...

Page 103: ...g operations are complete Operation complete OPC cr This command returns 1 to the output queue after all pending operations are complete Wait to Continue command WAI cr Prevents the instrument from executing any further commands or queries until all previous remote commands have been executed Reset RST cr This command resets the calibrator to its initial status Test operation TST cr This command e...

Page 104: ...atus Enable register is set the ESB of Status Byte Register is set too Event Status Enable reading IEEE488 only ESE cr This query returns the Event Status Enable register Clear status IEEE488 only CLS cr This command clears the Event Status Register and the Status Byte Register except the MAV bit and output queue Remote control REM cr This command activates the remote control When the calibrator i...

Page 105: ...ot be returned to local control by pressing LOCAL button Return to local control can only be performed by a command sent through the bus or by switching the calibrator off and on Local control unlock UNL cr This command cancels the LLO command Unlocked calibrator can be returned to local control mode by pressing LOCAL button ...

Page 106: ...ster ESR Event Status Register ESE Event Status Enable Register Output Queue STB Status Byte Register The summary messages from the Event Status Register and Output Queue are used to set or clear the appropriate bits B4 and B5 of the Status Byte Register These bits do not latch and their states 0 or 1 are solely dependent on the summary messages 0 or 1 For example if the Standard Event Register is...

Page 107: ...values of the SRE The value of unused bit 6 shall always be zero The Service Request Enable Register is written with the SRE common command followed by an integer value 0 191 Sending the SRE common command followed by a zero clears the SRE A cleared register does not allow status information to generate a rsv local message and thus no service request are issued The Service Request Enable Register ...

Page 108: ...ESE Data is returned as a binary weighted value The Event Status Enable Register is written to by the common command ESE Sending the ESE common command followed by a zero clears the ESE The Event Status Enable Register is cleared upon power on Output Queue The Output Queue stores response messages until they are read The availability of output is summarized by the MAV message available summary mes...

Page 109: ...oltage output is connected to Hi Lo terminals The calibrator does not allow the four wire connection of the instrument to be calibrated It is not recommended to connect non standard load to the voltage output The calibrator is designed to be used for calibration of voltmeters Output terminals should be loaded with high and real impedance Although the output is fitted with fast electronic and micro...

Page 110: ...ibrator disconnects the output terminals and displays an error message When ammeters are being calibrated using currents over 1 A it is important to connect the terminals properly paying attention both to the calibrator s output terminals and the instrument s input terminals Excessive contact resistance can heat up the terminals and cause calibration errors Excessive and unstable contact resistanc...

Page 111: ...sed for calibration of DC and AC digital and analogue powermeters and energy meters The following limitations apply voltage 0 2 V to 240 V current 2 mA to 10 A frequency DC 40 Hz to 400 Hz time 1 1 s to 1999 s phase shift 180 to 180 The display can show active reactive and apparent power and energy values The phase shift between the output voltage and current can be set and displayed as well eithe...

Page 112: ...ture of the measurement instrument to be calibrated the following situations can occur Device under test GND U GND I U input floating I input floating U and I inputs galvanically disconnected not grounded ON ON U input floating I input floating galvanically connected terminals L both U and I inputs not grounded ON OFF OFF ON voltage input grounded current input floating OFF ON voltage input floati...

Page 113: ...d can be set up to 10 s with selectable duty cycle The function is activated by pressing F direct mode button and selecting PWM mode Frequency can be set The delay of the signal displayed on the oscilloscope s screen is checked The oscilloscope to be calibrated connects to FREQ connector using a coaxial cable Thermometers The calibrator can be used for calibration of transducers used in thermomete...

Page 114: ...le is connected to calibrator s AUXILIARY connector the other end has bananas which connect calibrator to the measured object When making the connection observe the polarity and connect the calibrator s L terminal to the L common or grounded terminal of the measurement instrument To activate the measurement select the respective function mode and press INPUT to measure the input value ATTENTION Th...

Page 115: ...lue Measurement of resistance or temperature using resistance temperature sensors Resistance can only be measured using four wire connection using Opt 60 or Opt 140 41 cable adapter Opt 60 cable ends with four bananas labeled Hi Hu Lu Li Their meaning is as follows Hi current terminal H Hu voltage terminal H Lu voltage terminal L Li current terminal L During the measurement of resistance or temper...

Page 116: ...on mode using METER button in the function menu and press INPUT to measure the input value Connection of thermocouple to 140 41 cable adapter Strain gauge sensors for non electrical values The calibrator can be used to measure non electrical values using bridge connected strain gauges The bridge is supplied with DC voltage up to 15 V while measurement of small DC voltages between the other two poi...

Page 117: ...he connection of the sensor to the calibrator Connection of the sensor to SENSOR connector Meaning of pins of SENSOR connector 1 Voltage signal output of the bridge 2 Power supply power to the bridge 3 Not connected 4 Not connected 5 Voltage signal output of the bridge 6 Power supply power to the bridge 7 Shielding SGS sensor SGS sensor SENSOR connector 1 2 3 4 5 6 7 ...

Page 118: ...perature or other non electrical sensor signals or the generation of small DC voltages at the input side and the measurement of standard outputs current loop standard voltage at the output side When using 140 41 cable adapter OUTPUT 140 41 option must be set in the setup menu This function selects the calibrator s output terminals If OUTPUT 140 41 option is set to PANEL calibrator s output is conn...

Page 119: ... is used Use of Option 70 Adapter is aimed for four wire generation of resistance values and for four wire resistance temperature sensor simulation Re calibration of resistance function of the calibrator can be performed only with this adapter Resistance ranges are the same as two wire resistance ranges with output on Hi Lo terminals on front panel When adapter Option 70 is used resistance output ...

Page 120: ...trial thermometers with thermocouple sensor and frequency output Function setup Calibrator T TC function OUTPUT 140 41 ON Multimeter F Adapter Opt 140 41 3 Calibration of a single phase electrical power current loop transducer Function setup Calibrator P function voltage current power factor frequency Multimeter DCI Adapter Opt 40 DUT INPUT OUTPUT Pt100 H L DUT INPUT OUTPUT TC H L INPUT OUTPUT HU ...

Page 121: ...id for all test programs Table below shows measurement capability of different cable adapters connected to the auxiliary connector Tab 20 overview of cable adapters Note Option 60 can be used directly used only for resistance and RTD sensors measurement Option 60 is used also for calibration of mVDC ranges 20 mV 200 mV 2000 mV Option 70 is applicable only for four wire simulation of resistance Fun...

Page 122: ...For load current in range 5mA to 40 mA add additional accuracy U uV 10 Iload mA 3 value of the range for uncertainty calculation is 200 V ACV uncertainty range value range max current mArms value range max current mArms 20 Hz 10 kHz 20 Hz 10 kHz 10 kHz 50 kHz 10 kHz 50 kHz 0 10000 mV 20 00000 mV 0 2 0 05 20 V 5 0 20 0 10 20 V 5 20 0001 mV 200 0000 mV 0 1 0 03 20 V 5 0 15 0 05 20 V 5 0 200001 V 2 0...

Page 123: ...01 mA 2 000000 A 0 015 0 005 3 2 00001 A 20 00000 A 10 0 02 0 010 1 5 ACI uncertainty range value range max voltage Vrms value range max voltage Vrms 20 Hz 1 kHz 1 kHz 5 kHz 1 0000 A 200 0000 A 0 15 0 0 20 nA 3 0 30 0 10 20 nA 3 0 200001 A 2 000000 mA 0 07 0 01 3 0 20 0 05 3 2 00001 mA 20 00000 mA 0 05 0 005 3 0 20 0 05 3 20 0001 mA 200 0000 mA 0 05 0 005 3 0 20 0 05 3 0 200001 mA 2 000000 A 0 05 ...

Page 124: ...fied uncertainty next 20 mOhm 8 In range from 200 k to 50 M uncertainty is valid for two terminal connection to front panel terminals Hi Lo 9 Maximal allowed voltage on output terminals is 8 Vpp Capacitance summary range 0 9 nF to 50 F resolution 41 2 digit Capacitance uncertainty range uncertainty of value max frequency 0 9000 nF 2 500 nF 0 5 15 pF 1000 Hz 2 501 nF 10 000 nF 0 5 5 pF 1000 Hz 10 0...

Page 125: ...2 00000 mA 20 00000 mA 0 05 0 010 3 20 0001 mA 200 0000 mA 0 05 0 005 3 0 200001 mA 2 000000 A 0 05 0 005 3 2 00001 A 10 00000 A 0 05 0 010 1 5 PHASE uncertainty frequency range Hz phase uncertainty d 40 000 200 000 0 15 200 001 400 000 0 25 AC POWER uncertainty Uncertainty of AC power can be calculated from the following formula for active power d P dU2 dI2 dPF2 0 032 for reactive power d P dU2 d...

Page 126: ... 0 1 Hz to 20 MHz frequency uncertainty 0 005 frequency resolution 6 digit minimum step 0 001Hz output BNC connector located on the front panel modes PWM square wave output with calibrated duty cycle ratio frequency and amplitude HF square wave output with calibrated frequency and amplitude Mode PWM frequency range 0 1 Hz to 100 kHz voltage range 1 mV to 10 V duty cycle ratio range 0 01 to 0 99 wa...

Page 127: ... range 250 to 1820 oC according to the type temperature uncertainty 0 4 to 4 3 oC see table below resolution 0 1 o Ranges and uncertainties of TC sensor simulation with function AUTOCAL ON R range o C 50 0 0 400 400 1000 1000 1767 uncertainty o C 3 2 2 1 1 4 1 7 S range o C 50 0 0 250 250 1400 1400 1767 uncertainty o C 2 7 2 1 1 7 2 0 B range o C 400 800 800 1000 1000 1500 1500 1820 uncertainty o ...

Page 128: ...emperature is 350 o C Maximum measured resistance is 2 k 14 Maximum allowed analogue input DC voltage is 2 V 1 5 Supply voltage 2 to 10 V DC non symmetrical Max current 40 mA Input resistance min 100 M Sensitivity setable in range 0 5 mV to 100 mV V Displayed unit user s defined Ranges and uncertainties of temperature measuring with TC sensor R range o C 50 0 0 400 400 1000 1000 1770 uncertainty o...

Page 129: ... pc Option 40 Cable adapter Canon 25 2 x BANANA 1 m 1 pc Option 60 Cable adapter Canon 25 4 x BANANA 1 m 1 pc Option 70 Adapter for four terminal resistance generation 1 pc Cable RS RS 232 cable 1 pc Options extra ordered 140 50 Current coil 50 turn 140 01 Cable adapter for calibration of multimeters 140 02 Set of cables 140 41 Cable adapter for simultaneous calibration measuring Option 10 Output ...

Page 130: ...ance uncertainty has been added In range from 200 k to 50 M uncertainty is valid for two terminal connection to front panel terminals Hi Lo Change 3 Accuracy specification and load current characteristic of the DC voltage range 200 mV has been added range value range Max guaranteed load current mADC 0 V 20 00000 mV 0 03 10 V 5 20 00001 mV 200 0000 mV 0 01 15 V 5 40 1 0 200001 mV 2 000000 V 0 003 0...

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