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Meatest M-142 Скачать руководство пользователя страница 72

M-142 Multifunction Calibrator

MEATEST, s.r.o.

72

User Manual v48

2, 20 V DC voltage ranges

The functional scheme is shown in the picture below:

There is a DC reference voltage source integrated within the 22bit measurement converter. Its output is fed to the
output stage for 2 and 20 V range. Output 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 V amplifier.

2 to 200 V AC voltage ranges

The functional scheme is shown in the picture below:

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Содержание M-142

Страница 1: ...M 142 Multifunction Calibrator Operation Manual ...

Страница 2: ...M 142 Multifunction Calibrator MEATEST s r o 2 User Manual v48 ...

Страница 3: ...16 Setting the value of output signal 16 Setting relative deviation 18 Change of value by factor of ten 19 Connection disconnection of output terminals 19 Setting the frequency 20 Generation of calibrated voltage 21 Generation of calibrated current 23 Generation of non harmonic shapes 24 Simulation of resistance and capacitance 25 Generation of electric power and energy 27 Generation of frequency ...

Страница 4: ...tion of measuring instruments 104 Multimeters 104 Powermeters 106 Counters and oscilloscopes 108 Thermometers 108 Measurement using the calibrator 109 Voltage current and frequency 109 Measurement of resistance or temperature using resistance temperature sensors 109 Measurement of temperature using thermocouples 110 Testing of control unit transducers and evaluation units 110 Option 40 60 cable ad...

Страница 5: ...alibration points 57 Tab 15 Multimeter calibration points 57 Tab 16 Error messages 67 Tab 17 RS232 connector description 84 Tab 18 Recommended way of signal terminal grounding 105 Tab 19 Application of cable adapters 107 Tab 20 Overview of cable adapters 109 Table I Verification test VDC 20V 80 Table II Verification test VDC 80 Table III Verification test VAC 20V 80 Table IV Verification test VAC ...

Страница 6: ...ges can be used to calibrate the corresponding frequency ranges of multimeters as well as to calibrate the input sensitivity and time bases of oscilloscopes Powermeter mode can be used to calibrate DC and AC single phase powermeters and energy meters Voltage range is up to 240 V and current range is up to 20 A power factor range is 1 to 1 and the resolution is 1 in the 40 Hz to 400 Hz frequency ra...

Страница 7: ...ying the Calibrator s model and serial number Power on Before connecting the calibrator to the mains check the position of the mains voltage selector located at 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 calibrat...

Страница 8: ...new fuse of the same rating Storing The calibrator can be stored in original packing under storing conditions specified in chapter Specification 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 ...

Страница 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...

Страница 10: ...stance capacitance R C power energy P E frequency F internal multimeter METER simulation of temperature sensors T Tab I One touch buttons 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...

Страница 11: ...o 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 being...

Страница 12: ...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 terminal for DC curre...

Страница 13: ... in the setup menu b Auxiliary data This line displays the total value of 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 b...

Страница 14: ...ays the maximum error of the main value of the output signal 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 exce...

Страница 15: ...n 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 ...

Страница 16: ...eter starts measuring the value present 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 Previou...

Страница 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 ...

Страница 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...

Страница 19: ...of value by factor of ten All functions of the calibrator allow the increase of the output value by 10 or reduction of the output value by 10 Such operation is equivalent to the 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 result...

Страница 20: ...tage ACU AC current ACI Set value of frequency is included in the minor data section of the display in ACU ACI P E modes Frequency change First select the AC voltage or AC current 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 disp...

Страница 21: ... 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 frequency and relative deviation The signal is yet not connec...

Страница 22: ...disconnected 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 ci...

Страница 23: ...utput 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 disconnection of output terminals Connect the load or short the output terminals ...

Страница 24: ...arewave positive with adjustable duty cycle PWM SYM squarewave symmetrical with adjustable 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 ge...

Страница 25: ...tage sensing terminals Cable adapter Option 70 must be used for four wire connection Type of cable adapter currently connected to the AUXILIARY connector is displayed on the display If Option 70 is connected label CA 140 70 is displayed in the right side Cable adapter Option 70 can be used for four wire connecting of simulated resistance only In compare with direct two wire connection through outp...

Страница 26: ...l _ _ _ _ _ _ _ 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 values with accuracy sufficient for calibration o...

Страница 27: ...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 remaining time of output current ON state when current is set in range 10 to 20 A Set desired value of pow...

Страница 28: ...ts The calibrator 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 ch...

Страница 29: ...tons 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 confirm...

Страница 30: ...er value is recalculated using new 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 ph...

Страница 31: ... display button depending on the set mode The value 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 142 calib...

Страница 32: ...quarewave output signal with calibrated amplitude frequency 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 ...

Страница 33: ...e FREQ connector must not be overloaded In 100 mV to 10V voltage range maximum load 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 _ _...

Страница 34: ...tion in dB can only be set in HF mode Attenuation 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 us...

Страница 35: ...s When thermocouples are simulated a simulated voltage corresponding to set temperature sensor type and temperature of cold end of thermocouple is connected to Hi Lo terminals Simulated values of resistance temperature sensors are also available at the AUXILIARY connector Four wire connection of resistance temperature sensors is provided by current terminals PTLI PTHI and voltage terminals PTLU PT...

Страница 36: ...als are disconnected Connect the object 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...

Страница 37: ...by 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 ...

Страница 38: ...ffects 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 acti...

Страница 39: ...ns 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 parameters of the active option Multimeter parameters can also be...

Страница 40: ...re measurement using thermocouples T TC temperature measurement using resistance temperature sensors T RTD By selection of the measurement function some related options are automatically changed as well measuring range unit of measurement Press EXIT display button the close the function selection menu and to return to the basic display Setting the measurement range Press METER direct control butto...

Страница 41: ...ay and symbols above the active character Press UP DOWN display buttons or use the potentiometer to select desired character at the active position Press NEXT display button to move onto next character Press the knob of the potentiometer to complete the setting After the unit of measurement is selected use or cursor buttons to move onto the next menu option The same can be achieved using the poten...

Страница 42: ...pressing the knob Press EXIT display button the close the range selection menu and to return to the basic display If you want to reset a coefficient to original setting press CLR display button Each measurement function of the multimeter has its own independent set of coefficients Setting function parameters Some measurement functions have additional parameters When measuring the temperature using...

Страница 43: ...inty of measuring If the input range is exceeded OVERFLOW message is displayed 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 ongoing measured values A Zero m...

Страница 44: ...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 within 0 2 to 5 V range Square wave or pulse shape of the input signal is expected Overloading can damage the multimeter...

Страница 45: ...25 mA frequency up to 15 kHz Option 40 Cable connected onto calibrator s AUXILIARY connector 4 The calibrator is used with Option 60 Canon 4 banana cable end Calibrator output signals are not limited in any way and can be fully used Calibrator output signals are only available at the terminals located at the front panel The multimeter can only be used in the following ranges temperature using TC s...

Страница 46: ...owing options 1 Current Coil xx x25 x50 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 either 25 times or 50 times depending on set paarmeter 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 t...

Страница 47: ...d 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 approximately 2 5 s 8 Interface xx GPIB RS232 Displays the type of interface used to control the calibrator from a PC By pressing ...

Страница 48: ...e 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 16 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 17 Switch activity xx PASS FAIL This parameter controls t...

Страница 49: ...cally recorded when leaving the calibration mode 20 Serial No xxxxxx Displays the serial number of the calibrator The parameter cannot be changed 21 Time xx yy Displays real time The parameter can be changed using HOUR UP HOUR DO MIN UP MIN DO display buttons 22 Date xx yy zzzz Displays real time The parameter can be changed using DAY UP MONTH UP YEAR UP YEAR DO display buttons 23 Time on display ...

Страница 50: ...p of the calibration can be skipped DC voltage calibration is performed by setting the zero and slope of the scale in all ranges and in both signal polarities and except the 1000 V range where zero correction is not necessary AC voltage calibration is performed by setting the 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 D...

Страница 51: ...ibration cable adapters Option 40 10V range voltage current Option 80 20mV 200mV 2V range voltage and Option 60 resistance must be used Access to the calibration procedure Calibration code is required to access the calibration procedure Press SETUP to open the setup menu Press CALIB display button Concerning cable adapters access to the calibration mode is permitted without connected any of cable ...

Страница 52: ...ion 4 CURRENT AC All AC current ranges calibration 5 POWER DC DC power calibration 6 POWER AC AC power calibration 7 RESISTANCE Resistance calibration 8 CAPACITANCE Capacitance 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 par...

Страница 53: ... hold all data old or new entered and the calibrator returns to the calibration menu It is not necessary to calibrate all ranges calibration of only selected ranges is possible by skipping the ranges which do not need to be calibrated Moreover the display shows the range which is being calibrated RANGE and the value to be set at the external standard multimeter VALUE Setting the new calibration da...

Страница 54: ... no calibration data have been entered the program has returned to the calibration menu after EXIT display button has been pressed Press EXIT display button to terminate the calibration After the button is pressed the calibration date is saved internally and the calibrator returns to the state it was in before the calibration has been started Calibration points Each function of the calibrator has ...

Страница 55: ...alibration 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 Tab 6 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 100...

Страница 56: ...0 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 Tab 8 DC CURRENT CURRENT AC function nominal value A set limits A range A recommended frequency Hz 1...

Страница 57: ...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 Tab 10 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...

Страница 58: ... 1 M 50 1 M 3M3 3M3 400 1 M 3M3 3M3 400 3M3 10 M 10 M 2 k 3M3 10 M 10 M 2 k 10 M 33 M 33 M 15 k 10 M 33 M 33 M 15 k 33 M 100 M 100 M 190 M 50 k 100 k 33 M 100 M 100 M 330 M 1 G 1 M 330 M 1 G 22 k 0 4 linearity 22 k 0 4 linearity Tab 12 Resistance 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 ou...

Страница 59: ...ope calibration Tab 14 Frequency ANALOG INPUT multimeter function voltage current resistance calibration nominal value set limits range note 0 V 50 u 10 V zero calibration 10 V 200 u 10 V slope calibration 0 mA 50 nA 20 mA zero calibration 19 mA 500 nA 20 mA slope calibration 0 5 m 200 zero calibration 100 5 m 200 slope calibration 0 50 m 2000 zero calibration 1000 50 m 2 k slope calibration 0 mV ...

Страница 60: ...setup menu and then 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 142 output terminal...

Страница 61: ...ay 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 30 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 ...

Страница 62: ...range 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 t...

Страница 63: ...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...

Страница 64: ...but it has to be 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 ad...

Страница 65: ...utton 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 Resistance range calibration Calibration of both ranges 100 and 1000 consists of following steps 0 calibration resistance range of multimeter calibration For calibration of resistance ranges external stan...

Страница 66: ...ton to select the first calibration point of 200 mV range 0 mV After the value stabilizes 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 termin...

Страница 67: ... the calibration menu After the function is activated 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 ...

Страница 68: ...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...

Страница 69: ...r 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 ranges can be performed with adapter Option 70 Calibration of internal multimeter can be performed with cable adapters Option 40 and Option 60 30 Internal RxD ti...

Страница 70: ...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 ...

Страница 71: ...MEATEST s r o M 142 Multifunction Calibrator User Manual v48 71 ...

Страница 72: ...tput 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...

Страница 73: ...oltage 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 connect...

Страница 74: ... The output stage is push pull in B class Resistance and capacitance simulator Resistance and capacitance are simulated using an electronic simulator Hi and Lo 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 allows ...

Страница 75: ...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...

Страница 76: ... were designed for Whenever possible use the 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 30 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 ens...

Страница 77: ...an be caused by unacceptable distortion degraded 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...

Страница 78: ...fluence of noise or interference with power line frequency in measuring circuit it is recommended following setting of the calibrator in SETUP MENU Current Coil 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 Lo...

Страница 79: ...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 ...

Страница 80: ... calibrator frequency and 10 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 bellow 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 ...

Страница 81: ...calibrator Set output voltage 10 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 reca...

Страница 82: ...DC 20 0 V 16 0 DC 210 V DC 20 0 V 18 0 DC 230 V DC 20 0 V 19 0 DC 240 Table I DC voltage test Function Range Value V Frequency Hz Deviation allowed V V DC 2 0 V 1 9 DC 33 μ V DC 2 0 V 1 9 DC 33 μ V DC 240 0 V 190 0 DC 3 335 m V DC 240 0 V 240 0 DC 4 100 m V DC 240 0 V 190 0 DC 3 335 m V DC 240 0 V 240 0 DC 4 100 m V DC 1000 0 V 1000 0 DC 55 m V DC 1000 0 V 1000 0 DC 55 m Table II 20 V AC Basic ran...

Страница 83: ... DC 8 A DC 200 0 mA 0 04 DC 10 A DC 200 0 mA 0 06 DC 12 A DC 200 0 mA 0 08 DC 14 A DC 200 0 mA 0 10 DC 16 A DC 200 0 mA 0 12 DC 18 A DC 200 0 mA 0 14 DC 20 A DC 200 0 mA 0 16 DC 22 A DC 200 0 mA 0 18 DC 24 A DC 200 0 mA 0 19 DC 25 A DC 200 0 mA 0 02 DC 8 A DC 200 0 mA 0 04 DC 10 A DC 200 0 mA 0 06 DC 12 A DC 200 0 mA 0 08 DC 14 A DC 200 0 mA 0 10 DC 16 A DC 200 0 mA 0 12 DC 18 A DC 200 0 mA 0 14 D...

Страница 84: ...DC power test Function Range Value VA Frequency Hz Deviation allowed VA P 1 480W 480 60 0 336 P 0 5LA 480W 240 60 1 104 P 0 5LE 480W 240 60 1 104 P 1 2400W 2400 60 3 36 P 0 5LA 2400W 1200 60 9 24 P 0 5LE 2400W 1200 60 9 24 Table IX Voltage 240V Resistance test Function Range Value Ohm Frequency Hz Deviation allowed Ω O 4W 100 0 Ohm 10 0 DC 6 m O 4W 100 0 Ohm 100 0 DC 15 m O 4W 1000 Ohm 1000 0 DC 1...

Страница 85: ...Frequency Hz Deviation allowed FREQ 1 kHz 1000 0 Hz DC 50 mHz V DC 10 V 10 0 V DC 1 3 mV V DC 10 V 10 0 V DC 1 3 mV A DC 25 mA 0 020 A DC 3 3 μA A DC 25 mA 0 020 A DC 3 3 μA V DC 20 mV 0 019 V DC 11 μV V DC 20 mV 0 019 V DC 11 μV V DC 200 mV 0 19 V DC 45 μV V DC 200 mV 0 19 V DC 45 μV V DC 2 V 1 9 V DC 387 μA V DC 2 V 1 9 V DC 387 μA O 4W 200 Ohm 100 0 Ohm DC 30 mΩ O 4W 2 kOhm 1000 0 Ohm DC 210 mΩ...

Страница 86: ...1 SR1 The instrument also recognizes 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 ...

Страница 87: ...ll commands written on one line of the program after it receives cr lf or crlf code Without this code the program line is ignored Description of abbreviations 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 requ...

Страница 88: ...il is deactivated or HI50 if it is activated Example OUTP ISEL HI50 cr activates the 50 turn coil OUTP ISEL cr the calibrator returns HIGH or HI50 SOURce subsystem This subsystem allows to control the individual functions of M142 calibrator Keyword Parameters SOURce FUNCtion SHAPe CPD DC SINusoid PULPositive PULSymmetrical PULNegative RMPA RMPB TRIangle LIMSinusoid PWMPositive PWMSymmetrical PWMNe...

Страница 89: ...itching between 0 and amplitude PULSymmetrical sets AC squarewave signal for voltage or current modes The amplitude and duty cycle can be set The rectangles are symmetrical i 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 set...

Страница 90: ...ted for DC current Technical Data chapter lists the acceptable ranges If query is sent M142 returns the set value of current using standard exponential format Example 20 547mA is returned as 2 054700e 002 Positive numbers are not preceded with sign SOUR RES LEVE IMM AMPL DNPD This command activates the generation of a resistance DNPD Represents the value of the resistance in Ohms Technical Data ch...

Страница 91: ...urrent POWE PHAS cr the calibrator returns 2 502000e 002 Example POWE PHAS 0 554 LAG cr activates the power generation mode and sets 0 554 LAG power factor POWE PHAS cr the calibrator returns 5 540000e 001 LAG SOUR POWE VOLT LEVE IMM AMPL DNPD This command sets the amplitude of the voltage for power generation At the same time the power generation mode is set DNPD Represents the voltage expressed ...

Страница 92: ...when the signals are connected front panel terminals Example AUX 1 cr output signals are connected to AUXILIARY connector AUX cr the calibrator returns ON or OFF SOUR AUX ADAP This command can be used to find out what type of cable adapter is connected to AUXILIARY connector If query is sent M142 returns the type of cable adapter connected to AUXILIARY connector NONE CA14001 CA14041 CA14040 CA1406...

Страница 93: ... using standard exponential format Example 2 05V is returned as 2 05000e 000 SOUR FREQ ATTE DNPD This command sets the attenuation of digital SQU frequency signal Examples To set the attenuation of high frequency signal FUNC SQU FREQ ATTE DNPD cr DNPD Represents the attenuation in decibels 0 to 30 dB can be set in 10 dB increments If query is sent M142 returns the set value of the attenuation usin...

Страница 94: ...the set temperature using standard exponential format Example 20 5 C is returned as 2 050000e 001 SOUR TEMP THER TYPE CPD B E J K N R S T This command sets the type of thermocouple to be simulated Example to activate the simulation of S type thermocouple at 350 C TEMP THER 350 TEMP THER TYPE S cr If query is sent M142 returns the set type thermocouple B E J K N R S T SOUR TEMP PRT LEVE IMM AMPL DN...

Страница 95: ...ned as 2 050000e 001 MEASure subsystem This subsystem allows to control the internal multimeter of M142 calibrator It sets the multimeter s functions and reads measured values Keyword Parameters MEASure CONFigure VOLTage CURRent MVOLTage RESistance FREQuency TEMPerature RTD TYPE CPD PT385 PT392 NRESistance DNPD THERmocouple TYPE CPD B E J K N R S T RJUNction DNPD MEAS This command returns the meas...

Страница 96: ...ge 0 2000 of internal multimeter and switches it on Example to set the multimeter to resistance measurement mode MEAS CONF RES cr MEAS CONF FREQ This command selects the function FREQ of internal multimeter and switches it on Example to set the multimeter to frequency measurement mode MEAS CONF FREQ cr MEAS CONF TEMP RTD TYPE CPD PT385 PT392 This command selects the function RTD of internal multim...

Страница 97: ...S T MEAS CONF TEMP THER RJUNction DNPD This command selects the function TC of internal multimeter sets the temperature of cold junction of selected thermocouple and switches the multimeter on DNPD Represents the temperature expressed in the unit set by the UNIT command In Technical Data chapter there is list of acceptable ranges Example to set the temperature of cold end of thermocouple to 25 C M...

Страница 98: ...turns 1 to the output queue after all pending 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...

Страница 99: ...more of the enabled events of the Event Status 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 activate...

Страница 100: ...librator cannot 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 ...

Страница 101: ...ister 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 i...

Страница 102: ...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 ...

Страница 103: ... 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 me...

Страница 104: ...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...

Страница 105: ...ys 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 resistance has non linear characteristic and can distort the...

Страница 106: ... vicinity 50 cm of the current coil as they would deform the magnetic field and cause big calibration error Connection of current coil Powermeters The calibrator can be used 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 20 A frequency DC 40 Hz to 400 Hz time 1 1 s to 1999 s phase shift 180 to 1...

Страница 107: ...nteed precision of the calibrator the powermeter to be calibrated as well as the calibrator must be properly grounded Depending on the nature 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 conne...

Страница 108: ...ty cycle can be set check of bandwidth using a signal up to 20 MHz with very steep rising edge less than 5 ns Calibration of time period using squarewave signal whose period 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 ...

Страница 109: ... 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 The input terminals of the built in multimeter are floating Maximum voltage between the input terminals and the chassis is 15 Vpk If this value is exceede...

Страница 110: ...be measured Two methods of connection can be used each of them having different function and generation and measurement ranges Simultaneous mode can only be used if Opt 40 60 80 cable adapter is connected to AUXILIARY terminal When no adapter is connected simultaneous mode cannot be activated Option 40 60 cable adapter application Cable adapter Option 40 cable supports simultaneous mode measuremen...

Страница 111: ...emperature measurement is available When connected external thermocouple to Option 80 temperature of the sensor is directly displayed Type of thermocouple can be set in METER setup Table bellow shows measurement capability of different cable adapters connected to the auxiliary connector Tab 20 overview of cable adapters Note Option 140 70 is applicable only for four wire simulation of resistance O...

Страница 112: ... TC temperature sensor 10 V 20 mA f Calibration of temperature evaluation units setting of temperature regulators Frequency 10 V 20 mA Setting calibration of energy meters Resistance 10 V 20 mA Measurement of resistance bridges Calibration of a single phase electrical power current loop transducer Function setup Calibrator P function voltage current power factor frequency Multimeter DCI Adapter Op...

Страница 113: ... uncertainty calculation is 200 V ACV uncertainty Range value μV Max current mA value range Max current mA 20 Hz 10 kHz 20 Hz 10 kHz 10 kHz 50 kHz 10 kHz 50 kHz 0 10000 mV 20 00000 mV 0 2 30 0 5 3 0 20 0 10 20 V 0 5 3 20 0000 mV 200 0000 mV 0 1 80 4 3 0 15 0 05 20 V 4 3 0 200000 V 2 000000 V 0 018 100 30 0 05 0 01 10 2 00000 V 20 00000 V 0 018 1 000 30 0 05 0 03 10 20 0000 V 240 0000 V 2 0 018 10 ...

Страница 114: ...20 2000 3 0 5 ACI uncertainty Range value μA Min compliance voltage Vrms value μA Min compliance voltage Vrms value μA Min compliance voltage Vrms 20 Hz 1 kHz 2 1 kHz 5 kHz 5 kHz 10 kHz 1 0000 A 200 0000 A 0 15 0 02 3 0 30 0 22 3 0 200000 mA 2 000000 mA 0 07 0 2 3 0 20 1 3 0 50 1 4 2 2 00000 mA 20 00000 mA 0 05 1 3 0 20 10 3 0 50 14 2 20 0000 mA 200 0000 mA 0 05 10 3 0 20 100 3 0 50 140 2 0 200000...

Страница 115: ...nA 600 nA 12V 1 2uA 20V 0 6uA 33 M 100M 0 2 10 000 10 nA 180 nA 12V 0 36uA 20V 0 18uA 100 M 1000 M 0 5 10 000 4 nA 20 nA 12V 0 1uA 20V 0 02uA 1 In range 0 to 200 k specification is valid for four terminal connection using Option 70 Cable adapter For two terminal connection from front panel terminal add 20 mOhm 2 Voltage is expressed in V pk pk 3 In range 200 k to 1000 M specification is valid for ...

Страница 116: ...nty ACI uncertainty Range value μA Max compliance voltage V 2 00000 mA 20 00000 mA 0 05 2 3 20 0000 mA 200 0000 mA 0 05 10 3 0 200000 A 2 000000 A 0 05 100 3 2 00000 A 20 00000 A 1 0 05 2000 1 5 1 Continuous current in range bellow 10 A In range 10 to 20 A limited time to 30 s PHASE uncertainty Frequency range Hz Phase accuracy d 40 000 200 000 0 15 200 001 400 000 0 25 AC POWER uncertainty Uncert...

Страница 117: ...gy Frequency summary range 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 r...

Страница 118: ...250 to 1820 oC according to the type temperature uncertainty 0 4 to 4 3 oC see the table bellow resolution 0 1 o Ranges and uncertainties of TC sensor simulation R range oC 50 0 0 400 400 1000 1000 1767 uncertainty oC 1 8 1 4 1 4 0 7 0 7 0 6 0 6 0 5 S range oC 50 0 0 250 250 1400 1400 1767 uncertainty oC 1 6 1 3 1 3 0 8 0 8 0 6 0 7 0 6 B range oC 400 800 800 1000 1000 1500 1500 1820 uncertainty oC...

Страница 119: ...rrent 1 mA 3 For Pt 1000 sensor maximum temperature is 350 oC Maximum measured resistance is 2 k 4 Maximum allowed analogue input DC voltage is 2 V Ranges and uncertainties of temperature measuring with TC sensor R range oC 50 0 0 400 400 1000 1000 1770 uncertainty oC 2 5 1 5 1 0 1 2 S range oC 50 0 0 250 250 1400 1400 1770 uncertainty oC 2 0 1 6 1 1 1 3 B range oC 400 800 800 1000 1000 1500 1500 ...

Страница 120: ... SUB25 2xbannana for VDC mADC measurement 1 pc Option 60 Input cable adapter D SUB25 4xbannana for 4W resistance RTD temperature measurement 1 pc Option 70 Output cable adapter D SUB25 4xbannana 4W resistance source 1 pc Option 80 Input cable adapter D SUB25 2xbannana for mVDC TC temperature measurement 1 pc Cable RS232 1 pc Options extra ordered 140 50 Current coil 50 turn 140 01 Cable adapter fo...

Страница 121: ... s r o M 142 Multifunction Calibrator User Manual v48 121 Manufacturer and service MEATEST s r o tel 420 543 250 886 Zelezna 3 619 00 Brno fax 420 543 250 890 Czech Republic meatest meatest cz www meatest com ...

Страница 122: ...ance uncertainty has been added 3 In range 200 k to 1000 M specification is valid for two terminal connection directly to front panel terminals Hi Lo Change 3 On page 58 added explanation of standard ohmmeter connection during calibration procedure 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 ...

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