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Multifunction calibrator
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M – 142
Multifunction Calibrator

Operation Manual

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Summary of Contents for Meatest M-142

  • Page 1: Operation Manual

    M – 142 Multifunction Calibrator Operation Manual...
  • Page 2 M-142 Multifunction Calibrator MEATEST, s.r.o. User Manual v48...

  • Page 3: Table Of Contents

    MEATEST, s.r.o. M-142 Multifunction Calibrator Content Operation Manual ........................1 List of tables ..........................5 Basic Information ........................6 Preparation for operation ......................7 Inspecting package contents, selecting the installation location ............7 Power-on..............................7 Warm-up time .............................7 Replacement of fuse ...........................8 Storing ..............................8...
  • Page 4 M-142 Multifunction Calibrator MEATEST, s.r.o. Start of measurement ........................43 Zero function ............................ 43 Simultaneous functions ........................45 Setup menu ..........................46 Calibration mode ........................50 Error messages ........................68 Functional description of the calibrator ................70 Calibrator’s maintenance ....................... 76 Verification test ........................

  • Page 5: List Of Tables

    MEATEST, s.r.o. M-142 Multifunction Calibrator List of tables Tab. 1 Functions Tab. 2 Reference values Tab. 3 Auxiliary connector description Tab. 4 Display buttons description Tab. 5 Cable adapters description Tab.6 DC VOLTAGE calibration points Tab.7 AC VOLTAGE calibration points Tab.8...

  • Page 6: Basic Information

    It generates fixed non-harmonic signals to allow calibration of measuring instruments using signals with non-zero harmonic distortion. Frequency, amplitude and duty cycle of output signal can be adjusted. M-142 Multifunction Calibrator is also suitable for basic calibration of oscilloscopes.

  • Page 7: Preparation For Operation

    MEATEST, s.r.o. M-142 Multifunction Calibrator Preparation for operation Inspecting package contents, selecting the installation location Basic package includes the following items: • Multifunction calibrator • Power cord • Spare fuse T4L250/T, T8L250/T • Operation manual. • Test report • Test cable 1000V/20 A 2 pcs •...

  • Page 8: Replacement Of Fuse

    M-142 Multifunction Calibrator MEATEST, s.r.o. Replacement of fuse The calibrator includes a fuse located in the mains connector at the rear panel. Replace the fuse as follows: • Switch off the calibrator • Remove the end of power cord from the mains connector at the rear panel.

  • Page 9: Description Of Controls

    MEATEST, s.r.o. M-142 Multifunction Calibrator Description of controls Front panel The front panel of the calibrator includes a flat luminiscent display, control buttons and output terminals. The following picture shows the control part of the front panel. Display buttons There are five buttons below the display, whose meaning changes depending on the contents of the display.

  • Page 10: Tab. 2 Reference Values

    M-142 Multifunction Calibrator MEATEST, s.r.o. The function of the potentiometer can usually be performed by the cursor buttons. The central button is used to confirm the selection (ENTER). Numeric keyboard The keyboard allows the entry of numeric values on the display. The central button is used to confirm the selection (ENTER).
  • Page 11 MEATEST, s.r.o. M-142 Multifunction Calibrator Output / input terminals buttons OUTPUT button is used to connect the output signal of the calibrator to the output terminals. The connection is confirmed by red LED and a symbol at the display. METER button can be used to connect the input terminals to the internal multimeter. The connection is confirmed by green LED.

  • Page 12: Tab. 3 Auxiliary Connector Description

    M-142 Multifunction Calibrator MEATEST, s.r.o. label signal Limitation 0V5MER common terminal of multimetr power supply source ground (protection earth) SIMLI RC simulator output, current terminal Li Umax.= 10Vpp, Imax.=40mA SIMLU RC simulator output, voltage terminal Lu Umax.= 10Vpp, Imax.=40mA ground (protection earth)
  • Page 13 MEATEST, s.r.o. M-142 Multifunction Calibrator Display 1a 1b 1c 1d 1e 2a 2b 1g 1f The display is divided to three horizontal sections: OUTPUT section This section displays the set-up values of generated signals and the data related to the calibrator status. The...

  • Page 14: Tab. 4 Display Buttons Description

    M-142 Multifunction Calibrator MEATEST, s.r.o. • set value of current, voltage or power factor (phase) for power, energy functions • value of R0 resistance and the type of resistance temperature sensor • cold junction temperature of TC sensors and the selected type of TC sensor •...

  • Page 15: Rear Panel

    MEATEST, s.r.o. M-142 Multifunction Calibrator Rear panel The rear panel of the calibrator includes ventilation 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.

  • Page 16: Control Of The Calibrator

    M-142 Multifunction Calibrator MEATEST, s.r.o. Control of the calibrator Selection of function After the power is switched on and the initial checks complete, the calibrator resets to its reference status, i.e. DC voltage output with set value of 10 V and output terminals disconnected. Internal multimeter is switched off. The...
  • Page 17 MEATEST, s.r.o. M-142 Multifunction Calibrator Entry of the value using cursor buttons • press , ,  or  button. The display now includes cursor marks which point to the active digit. •  and  buttons can be used to change the active digit. ,  buttons can be used to change the position of the cursor marks •...

  • Page 18: Setting Relative Deviation

    M-142 Multifunction Calibrator MEATEST, s.r.o. Setting relative deviation All function modes of the calibrator except frequency mode allow a relative deviation of output value from the main data to be set using a separate display. Relative deviation is displayed in the “minor data” section of the display and is designated with „...

  • Page 19: Change Of Value By Factor Of Ten

    MEATEST, s.r.o. M-142 Multifunction Calibrator Setting relative deviation using potentiometer • keep pressing the center cursor button until [ _ _ _ _ _ _ _ ] symbols appear under the relative deviation value in the “minor data” section of the display •...

  • Page 20: Setting The Frequency

    M-142 Multifunction Calibrator MEATEST, s.r.o. Press the OUTPUT button again to disconnect the output terminals. Red LED goes off and the information field on the display shows the following symbol During mode change, output terminals are always disconnected. Output terminals are disconnected also when changing between voltage and current ranges or when changing between AC and DC ranges is performed.

  • Page 21: Generation Of Calibrated Voltage

    MEATEST, s.r.o. M-142 Multifunction Calibrator If frequency larger or smaller than the calibrator’s range is entered, the calibrator displays an error message: „Value is too large (small)“. Generation of calibrated voltage The multifunction calibrator provides calibrated DC and AC voltage. Output terminals for voltage ranges are labeled “...
  • Page 22 M-142 Multifunction Calibrator MEATEST, s.r.o. Control sequence when output voltage over 100 V is selected When output voltage over 100 V is selected, the information section of the display shows the symbol which informs that a life-threatening voltage will be present at the output terminals. If the output terminals are currently connected, they will be disconnected when output voltage over 100 V is selected.

  • Page 23: Generation Of Calibrated Current

    MEATEST, s.r.o. M-142 Multifunction Calibrator Generation of calibrated current The multifunction calibrator provides calibrated DC and AC current. Output terminals for voltage ranges are labeled “ +I “ and “ -I “ at the front panel. The terminals can carry high current and are the only terminals to which the calibrated object can be connected.

  • Page 24: Generation Of Non-Harmonic Shapes

    M-142 Multifunction Calibrator MEATEST, s.r.o. Overloading the terminals When external circuit connected to current output terminals is disconnected or there is higher voltage at the load than permitted, the calibrator disconnects the output terminals and displays „Overload I output“ message. The same message can be displayed when 50-turn coil is used for AC current output at frequencies above 80 Hz.

  • Page 25: Simulation Of Resistance And Capacitance

    MEATEST, s.r.o. M-142 Multifunction Calibrator • besides the main amplitude data, „pk“ index is displayed, notifying that the displayed main value is the peak value. Symbol which displays the shape of the output signal is displayed too. • below the main data, an information about the shape type „Shape xxxxx“ is displayed.
  • Page 26 M-142 Multifunction Calibrator MEATEST, s.r.o. uncertainty of set resistance (capacitance) total value of resistance (capacitance) if non-zero deviation is set • Set desired value of resistance (capacitance) or relative deviation. The value can be set using numeric keyboard, potentiometer or cursor buttons. Simulated resistance (capacitance) is not yet connected to the output terminals.

  • Page 27: Generation Of Electric Power And Energy

    MEATEST, s.r.o. M-142 Multifunction Calibrator Generation of electric power and energy The multifunction calibrator can generate exact value of electric power and energy. P-E function provides output voltage at Hi - Lo terminals and output current at +I - -I terminals. Lo and -I terminals are electrically connected.
  • Page 28 M-142 Multifunction Calibrator MEATEST, s.r.o. Display modes The calibrator can display AC power in one of three ways: • apparent power in VA • active power in W • reactive power in VAr Keep pressing MODE display button to change the function mode. Along with mode change, the power display (depending on set power factor) and unit of measurement change as well.
  • Page 29 MEATEST, s.r.o. M-142 Multifunction Calibrator Setting the voltage • The main power value can be changed by changing the voltage. • Select P-E mode and then keep pressing the center cursor button until [ _ _ _ _ _ _ _ ] symbols appear under the voltage (U = xxx.xxxx V).
  • Page 30 M-142 Multifunction Calibrator MEATEST, s.r.o. Setting the power factor (AC power only) • If W or Var is indicated, the main power value can be changed by changing the power factor. Change of power factor does not change the output apparent power.
  • Page 31 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 calibrator. This setting will ground both the current and voltage output of the calibrator.

  • Page 32: Generation Of Frequency

    M-142 Multifunction Calibrator MEATEST, s.r.o. Uncertainty calculation of set power Uncertainty of set power displayed on the Accuracy line of the display is calculated according to the following formula: d P =  ( dU for active power + dI + dPF + 0.03...
  • Page 33 MEATEST, s.r.o. M-142 Multifunction Calibrator duty cycle (PWM mode only) signal shape: PWM NEG / POS / SYM (PWM mode only) • Set the frequency using numeric keyboard, cursor buttons or potentiometer. Output signal is not yet connected to the output terminals. The information section of the display shows the symbol which informs about the disconnection of output terminals...
  • Page 34 M-142 Multifunction Calibrator MEATEST, s.r.o. • Set the value using numeric keyboard and confirm by pressing “V” display button or by pressing ENTER. Setting the attenuation Signal attenuation in dB can only be set in HF mode. Attenuation can be set in steps of (0, -10, -20, -30) dB.

  • Page 35: Simulation Of Temperature Sensors

    MEATEST, s.r.o. M-142 Multifunction Calibrator Setting the duty cycle Duty cycle can only be set in PWM mode. • Select the frequency mode and keep pressing the center cursor button until [ _ _ _ _ _ _ _ ] symbols appear under the duty cycle value (PWM = xx %).
  • Page 36 M-142 Multifunction Calibrator MEATEST, s.r.o. main data of temperature in C or K sensor type thermocouples: K, N, R, S, B, J, T, E resistance temperature sensors: Pt 1.385, Pt 1.392, Ni resistance at 0 C labeled R0 (resistance temperature sensors only) cold junction temperature of thermocouple sensors labeled RJ set value of relate deviation in %, labeled T = xxxx.x °C (K)
  • Page 37 MEATEST, s.r.o. M-142 Multifunction Calibrator Entry of R0 coefficient for resistance temperature sensors C labeled R0 can be set. The range is 20  to 2k for all For resistance temperature sensors, resistance at 0 types of resistance temperature sensors.
  • Page 38 M-142 Multifunction Calibrator MEATEST, s.r.o. Automatic compensation of cold junction temperature Automatic cold junction TC sensors compensation can be performed, when cable adapter Option 140-01 is used for simulating. Ambient temperature measured by in cable adapter mounted Pt1000 sensor is taken as temperature of cold junction.

  • Page 39: Multimeter

    MEATEST, s.r.o. M-142 Multifunction Calibrator Multimeter The calibrator includes a built-in multimeter which can measure many electrical and non-electrical values. Besides DC voltage and current, it can measure frequency, temperature and when external strain gauge sensors is connected, even other non-electrical values can be measured. The multimeter can only be connected through AUXILIARY connector.

  • Page 40: Function Selection

    M-142 Multifunction Calibrator MEATEST, s.r.o. When the multimeter is being set-up, measurement cannot be initiated. Measurement can only be initiated after the menu is left using the INPUT button. Function selection • Press METER direct control button and select FUNCTION option from the menu using cursor buttons.

  • Page 41: Units Of Measurement

    MEATEST, s.r.o. M-142 Multifunction Calibrator • After setting the range, use  or  cursor buttons to switch to the previous or next menu option. The same can be achieved using the potentiometer after pressing the knob. Press EXIT display button the close the range selection menu and to return to the basic display.

  • Page 42: Use Of Calculation Formula

    M-142 Multifunction Calibrator MEATEST, s.r.o. 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 * X...

  • Page 43: Start Of Measurement

    MEATEST, s.r.o. M-142 Multifunction Calibrator Start of measurement To start a measurement: • Press INPUT direct control button in the basic state of the calibrator. • INPUT field on the display shows the measured value. The measurement is indicated by a green LED above the INPUT button.
  • Page 44 M-142 Multifunction Calibrator MEATEST, s.r.o. Zeroing function can be used e.g. to compensate the voltage drops at the cables, to suppress any remanent value of the signal etc. Overloading can damage the multimeter. Notes: 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.

  • Page 45: Simultaneous Functions

    MEATEST, s.r.o. M-142 Multifunction Calibrator Simultaneous functions The multifunction calibrator allows simultaneous generation of calibrated signal along with measurement of another signal using the built-in multimeter. To use both parts of the calibrator simultaneously, cable adapters supplied by the manufacturer are necessary.

  • Page 46: Setup Menu

    M-142 Multifunction Calibrator MEATEST, s.r.o. Setup menu The multifunction calibrator allows many other, less frequently used parameters to be set. Setup menu is used to set these parameters. Setup menu is opened by pressing SETUP display button. If output terminals are connected, they will be disconnected and the following display appears: Use ...
  • Page 47 MEATEST, s.r.o. M-142 Multifunction Calibrator Note If neither the calibrator’s output, nor the meter’s inputs are grounded, signal/noise ratio can arise at the calibrator’s output. Temp.scale ..xx ITS90/PTS68 This parameter allows the temperature scale for platinum resistance temperature sensors to be selected. Pressing the display buttons allows to switch between ITS90 and PTS68 temperature scales.
  • Page 48 M-142 Multifunction Calibrator MEATEST, s.r.o. 12. Keyb.beep ..xx ON/OFF This parameter allows the acoustic indication of pressed buttons to be switched off or on. ON and OFF display buttons can be used to switch the indication off or on. ON is set by the manufacturer.
  • Page 49 MEATEST, s.r.o. M-142 Multifunction Calibrator Note It is advisable to write down actual calibration code if changed. If you forget the calibration code, you have to send the calibrator to the manufacturer. 19. Cal.date ..xx.yyyy Displays the date of last calibration of the calibrator (month/year). The parameter cannot be changed, as it is automatically recorded when leaving the calibration mode.

  • Page 50: Calibration Mode

    M-142 Multifunction Calibrator MEATEST, s.r.o. Calibration mode The multifunction calibrator includes a calibration procedure, which allows calibration of the calibrator. Zero point and slope of the characteristics of individual generation and measurement ranges are set during the calibration in predefined order. The calibration can only be controlled using the buttons and menu on the calibrator.
  • Page 51 MEATEST, s.r.o. M-142 Multifunction Calibrator Capacitance calibration is performed by setting the zero and slope of the scale in all ranges. Slope of each range is calibrated twice. In practice, 9 internal capacitance ranges (1 nF to 100 F) must be measured and the measured value entered into the calibrator;...
  • Page 52 M-142 Multifunction Calibrator MEATEST, s.r.o. • If incorrect calibration code is entered, an error message appears on the display for approximately 3 seconds: Err 20 Bad calib. code! • If correct calibration code is entered, calibration menu appears: • Use  and  cursor buttons to move the cursor through the list:...
  • Page 53 MEATEST, s.r.o. M-142 Multifunction Calibrator The table lists recommended calibration points. Having selected the required calibration point using SELECT display button, the following data are shown. Display buttons have the following meaning: WRITE new calibration value is entered into the memory, old value is irreversibly lost...
  • Page 54 M-142 Multifunction Calibrator MEATEST, s.r.o. 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 calibration, the calibrator returns to the calibration menu.

  • Page 55: Tab.6

    MEATEST, s.r.o. M-142 Multifunction Calibrator VOLTAGE DC function nominal value [V] set limits [V] range [V] note 20 m zero calibration -20 m zero calibration 19 m 20 m slope calibration -19 m -20 m slope calibration 200 m zero calibration...

  • Page 56: Tab.8 Dc Current Calibration Points

    M-142 Multifunction Calibrator MEATEST, s.r.o. CURRENT DC function nominal value [A] set limits [A] range [A] note 200 u zero calibration -200 u zero calibration 190 u 200 u slope calibration 190 u -200 u slope calibration 20 n zero calibration...

  • Page 57: Tab.10 Dc Power Calibration Points

    MEATEST, s.r.o. M-142 Multifunction Calibrator POWER DC function DC current calibration nominal value [A] set limits [A] range [A] note 400 n 20 m zero calibration 400 n -20 m zero calibration 19 m 20 m slope calibration -19m -20 m...

  • Page 58: Tab.12 R Calibration Points

    M-142 Multifunction Calibrator MEATEST, s.r.o. RESISTANCE function    nominal value [ set limits [ range [ 0.002 0.002 10 – 33 0.002 33 – 100 0.002 33 – 100 0.005 100 – 330 0.005 100 – 330 0.012 330 –...

  • Page 59: Tab.13 C Calibration Points

    MEATEST, s.r.o. M-142 Multifunction Calibrator CAPACITANCE function nominal value [F] set limits [F] range [F] 700 p – 1 n 700 p 1 n – 3.3 n 1 n – 3.3 n 3.3 n 3.3 n 3.3 n - 10 n...

  • Page 60: Calibration Procedure

    Select VOLTAGE DC from the calibration menu and confirm by pressing SELECT button. Switch M-142 output terminals ON. Follow the instructions provided on the calibrator’s display and the DCU table to adjust the calibrator’s output in the calibration points.
  • Page 61 MEATEST, s.r.o. M-142 Multifunction Calibrator To adjust the calibrator’s output in the calibration points, press SELECT button and use , , ,  cursor buttons or potentiometer to adjust the output voltage. Confirm correctly set value by pressing WRITE display button. If you want to skip the calibration point whose calibration you have already entered, press SKIP display button.
  • Page 62 M-142 Multifunction Calibrator MEATEST, s.r.o. Follow the instructions provided on the calibrator’s display and the POWER DC table to adjust the calibrator’s output in the calibration points. To adjust the calibrator’s output in the calibration points, press SELECT button and use , , , ...
  • Page 63 MEATEST, s.r.o. M-142 Multifunction Calibrator Capacitance ranges calibration Capacitance ranges calibration is performed by both calibration methods, i.e. setting the checked value and measuring this value with the standard instrument, as well as setting the nominal value of the calibrator’s measurement 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.
  • Page 64 M-142 Multifunction Calibrator MEATEST, s.r.o. Amplitude calibration in frequency mode Select FREQUENCY in the calibration menu. Connect the external multimeter with DC voltage measurement range selected to calibrator’s Hi - Lo output terminals. Follow the instructions provided on the calibrator’s display and the F table to adjust the calibrator’s output in the calibration points.
  • Page 65 MEATEST, s.r.o. M-142 Multifunction Calibrator • Leave input terminals of Option 40 adapter OPEN. • Make short on calibrator output terminals +I - -I. • Press SELECT display button to select the first calibration point, 0 mA. • After the value stabilizes, press WRITE display button to write new calibration zero value.
  • Page 66 M-142 Multifunction Calibrator MEATEST, s.r.o. • After the value stabilizes, write calibration value of resistance standard to the lower line and confirm by pressing WRITE. 20 mV voltage range calibration • Connect cable adapter Option 80 to the AUXILIARY connector.
  • Page 67 MEATEST, s.r.o. M-142 Multifunction Calibrator • Press SELECT display button to select 1900 mV calibration point. Red LED is lit above OUTPUT button. • Set such output voltage on the calibrator, that standard multimeter indicates 1900.0 mV • After the value stabilizes, press WRITE display button to write new calibration value.

  • Page 68: Error Messages

    M-142 Multifunction Calibrator MEATEST, s.r.o. Error messages If an error occurs during the calibrator’s operation or control, error message is displayed on the display. Errors can be caused by: • incorrect control using the front panel, i.e. attempts to force a prohibited mode, e.g. setting an out-of-range value, overloading of output terminals etc.,...

  • Page 69: Tab. 16 Error Messages

    MEATEST, s.r.o. M-142 Multifunction Calibrator label description troubleshooting error Overload 2V ! 2V range overloaded Output current is too high. Increase load resistance. Overload 20V ! 20 V range overloaded Output current is too high. Increase load resistance. Overload 200V ! 200, 1000 V ranges Output current is too high.

  • Page 70: Functional Description Of The Calibrator

    M-142 Multifunction Calibrator MEATEST, s.r.o. 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 •...
  • Page 71 MEATEST, s.r.o. M-142 Multifunction Calibrator User Manual v48...
  • Page 72 M-142 Multifunction Calibrator MEATEST, s.r.o. 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.
  • Page 73 MEATEST, s.r.o. M-142 Multifunction Calibrator The calibrator’s built-in generator generates a sine wave with voltage-controlled amplitude. The frequency is derived from microprocessor control circuit’s crystal oscillator. The signal is fed to 20 V or 200 V amplifier and then to output terminals. Feedback circuits sense the voltage present at the output terminals, normalize its value and detects it.
  • Page 74 M-142 Multifunction Calibrator MEATEST, s.r.o. Current converter The current converter and current amplifier form a separate design block based on a transconductivity converter with 10 S nominal conversion ratio. A six-range switched current amplifier connects to the output of the current converter. Its input is fitted with...
  • Page 75 MEATEST, s.r.o. M-142 Multifunction Calibrator Frequency synthesizer Frequency synthesis circuitry allows fine setting of frequency in the whole calibrator’s range. Frequency synthesis uses DSP circuits with basic frequency 20 MHz. Power and energy mode In the power/energy mode, the calibrator supplies the set voltage to Hi-Lo terminals and the set current through +I –...

  • Page 76: Calibrator's Maintenance

    M-142 Multifunction Calibrator MEATEST, s.r.o. Calibrator’s maintenance The multifunction calibrator is electronic instrument with microprocessor control. All blocks which are heavily loaded during the operation are cooled by a fan. Rules for correct operation Especially the following rules should be adhered to guarantee correct operation of the calibrator: •...
  • Page 77 MEATEST, s.r.o. M-142 Multifunction Calibrator • Remove the fuse. Replace it with new fuse of the same rating if the fuse was broken. • Replace the fuse holder, reconnect the power cord and switch on the calibrator. If the problem persists, contact the manufacturer.

  • Page 78: Verification Test

    M-142 Multifunction Calibrator MEATEST, s.r.o. Verification test Procedure recommended for verifying parameters of the calibrator is described in this chapter. During tests it is not necessary access to the interior of the instrument. Required equipment Following instruments are required for performance verification test: •...
  • Page 79 MEATEST, s.r.o. M-142 Multifunction Calibrator Basic steps of the performance verification test Verification procedure consists of following steps: • 20 V DC voltage test with linearity check • DC voltage internal ranges 20 mV, 200 mV, 2 V, 240 V, 1000 V test •...
  • Page 80 M-142 Multifunction Calibrator MEATEST, s.r.o. 10. Perform AC/DC high current test on range 30 A according to the table VIII. Deviation should not exceed specified limit. 11. Connect standard powermeter to the appropriate output and current terminals of the calibrator.
  • Page 81 MEATEST, s.r.o. M-142 Multifunction Calibrator 28. Use the same procedure to test resistance range 2000 Ohm. 29. Disconnect cable adapter Option 60 and connect distortion meter to the voltage output terminals of the calibrator. Set output voltage 10 VAC, frequency 1000 Hz and sin waveform.

  • Page 82: Table I Verification Test Vdc 20V

    M-142 Multifunction Calibrator MEATEST, s.r.o. Tables of limits 20 V DC Basic range with linearity test Function Range Value (V) Frequency (Hz) Deviation allowed(μV) V-DC 20.0 V-DC 20.0 V-DC 20.0 V-DC 20.0 V-DC 20.0 10.0 V-DC 20.0 12.0 V-DC 20.0 14.0...

  • Page 83: Table Iv Verification Test Vac

    MEATEST, s.r.o. M-142 Multifunction Calibrator AC voltage test Function Range Value (V) Frequency (Hz) Deviation allowed(V) V-AC 20 mV 0.019 1000 68 μ V-AC 200 mV 0.19 1000 270 μ V-AC 1000 442 μ V-AC 20.0 19.0 4.42 m V-AC 20.0...

  • Page 84: Table Vii Verification Test Aac

    M-142 Multifunction Calibrator MEATEST, s.r.o. AC current test Function Range Value (A) Frequency (Hz) Deviation allowed(A) A-AC 200.0 uA 0.00019 0.305 μ A-AC 2.0 mA 0.0019 1.53 μ A-AC 20.0 mA 0.019 10.5 μ A-AC 20.0 mA 0.019 10.5 μ...

  • Page 85: Table Xii Verification Test F

    MEATEST, s.r.o. M-142 Multifunction Calibrator Frequency test Function Range Value (Hz) Frequency (Hz) Deviation allowed(Hz) FREQ 1 kHz 1000.0 50 m Table XII Multimeter test Function Range Value (Hz) Frequency (Hz) Deviation allowed FREQ 1 kHz 1000.0 Hz 50 mHz...

  • Page 86: System Control

    M-142 Multifunction Calibrator MEATEST, s.r.o. System control The calibrator includes standardized IEEE-488 bus and RS232 serial line. System connectors are located at the rear panel. For the remote control to work properly, bus parameters must be set in the system menu. For IEEE- 488 bus, address is important (0 to 30 setting range).

  • Page 87: Command Syntax

    MEATEST, s.r.o. M-142 Multifunction Calibrator Command syntax The commands described in this chapter can be issued through both buses (GPIB and RS232). All commands listed in this chapter are explained in two columns: KEYWORD and PARAMETERS. KEYWORD column includes the name of the command. Each command includes one or more keywords. If a keyword is in brackets ( [ ] ), it is not mandatory.
  • Page 88 M-142 Multifunction Calibrator MEATEST, s.r.o. • OFF or 0 - deactivates the output If query is sent, M142 returns ON if the output is active or OFF if it is inactive Example: OUTP 1 <cr> - activates the output OUTP ? <cr> - the calibrator returns ON or OFF OUTP :ISEL (?) <CPD>...
  • Page 89 MEATEST, s.r.o. M-142 Multifunction Calibrator [: IMMediate] [: AMPLitude] (?) <DNPD> : EARTh : VOLTage (?) <CPD> { ON | OFF | 0 | 1 } : CURRent (?) <CPD> { ON | OFF | 0 | 1 } : AUXiliary (?) <CPD>...
  • Page 90 M-142 Multifunction Calibrator MEATEST, s.r.o. • SQUare sets HSO type output signal - digital pulse output. If query is sent, M142 returns a string containing { DC | SIN | PULP | PULS | PULN | RMPA | RMPB | TRI | LIMS | PWMP | PWMS | PWMN | SQU } depending on the current setting.
  • Page 91 MEATEST, s.r.o. M-142 Multifunction Calibrator The unit of measurement remains valid even after the calibrator is switched off and back on. If query is sent, M142 returns the set unit of measurement { DEG | COS }. Example: PHAS :UNIT DEG <cr> - sets the angle as the unit of measurement PHAS :UNIT ? <cr>...
  • Page 92 M-142 Multifunction Calibrator MEATEST, s.r.o. Example: EART : VOLT 1 <cr> - grounds the voltage output terminals EART : VOLT ? <cr> - the calibrator returns ON or OFF [SOUR] :EART :CURR (?) <CPD> { ON | OFF | 0 | 1 } This command connects or disconnects the current Lo terminal to/from GND terminal.
  • Page 93 MEATEST, s.r.o. M-142 Multifunction Calibrator Examples: To set symmetrical squarewave voltage signal, 10V with defined duty cycle: VOLT 10.0; FUNC :PULS ; FREQ :DUTY <DNPD> <cr> To set digital frequency POS signal with defined duty cycle : FUNC :PWMP ; FREQ :DUTY <DNPD> <cr>...
  • Page 94 M-142 Multifunction Calibrator MEATEST, s.r.o. The temperature scale remains valid after the calibrator is switched off. If query is sent, M142 returns the set temperature scale { TS68 | TS90 }. [SOUR] :TEMP :THER [:LEVE] [:IMM] [:AMPL] (?) <DNPD> This command activates the simulation of thermocouples (DC voltage generation).
  • Page 95 MEATEST, s.r.o. M-142 Multifunction Calibrator [SOUR] :TEMP :PRT :NRESistance (?) <DNPD> This command sets the nominal resistance of the resistance temperature sensor at 0C. 10 to 2k can be set. <DNPD> Represents the nominal resistance in Ohms. If query is sent, M142 returns the set value of nominal resistance using standard exponential format. Example: 20.5...
  • Page 96 M-142 Multifunction Calibrator MEATEST, s.r.o. 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>...
  • Page 97 MEATEST, s.r.o. M-142 Multifunction Calibrator <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, M142 returns the set value of nominal resistance using standard exponential format. Example: 20.5...
  • Page 98 M-142 Multifunction Calibrator MEATEST, s.r.o. I/D (instrument identification) *IDN? This command returns the identification of the manufacturer, model, serial number and firmware revision. The reply is formatted as follows: MEATEST,M-142,412341,4.6 Operation complete *OPC <cr> This command sets the OPC bit in the ESR (Event Status Register) when all pending operations are complete.
  • Page 99 MEATEST, s.r.o. M-142 Multifunction Calibrator Service Request Enable setting (IEEE488 only) *SRE <value> <cr> This command sets condition of the Service Request Enable register. Since bit 6 is not used, the maximum entry is 191. Service Request Enable reading (IEEE488 only) *SRE? <cr>...
  • Page 100 M-142 Multifunction Calibrator MEATEST, s.r.o. Local control lock *LLO <cr> This command locks out the local control; the calibrator 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.

  • Page 101: Standard Status Data Structures

    MEATEST, s.r.o. M-142 Multifunction Calibrator Standard Status Data Structures All status registers are defined by the IEEE-488.2 standard. The programmer has access to Status Register, Enable Register and Output Queue in the M142 Calibrator. Status data structure of M142 Calibrator contains following registers: STB –...
  • Page 102 M-142 Multifunction Calibrator MEATEST, s.r.o. Request Service, bit 6. The RQS bit is set to 1 whenever bits ESB or MAV change from 0 to 1 and are enabled (1) in the SRE. When RQS is 1, the M142 asserts the SRQ control line on the IEEE-488 interface.
  • Page 103 MEATEST, s.r.o. M-142 Multifunction Calibrator ESE Event Status Enable Register The Event Status Enable Register allows one or more events in the Event Status Register to be reflected in the ESB summary-message bit. This register is defined for 8 bits, each corresponding to the bits in the Event Status Register.

  • Page 104: Examples Of Use

    M-142 Multifunction Calibrator MEATEST, s.r.o. Examples of use Calibration of measuring instruments The calibrator can be used for direct calibration of various instruments which measure electrical values. Opt. 140-01 cable adapter is recommended. The cable adapter includes a temperature sensor which allows the measurement of external temperature.
  • Page 105 MEATEST, s.r.o. M-142 Multifunction Calibrator Connection of a multimeter to be calibrated (voltage range) to the terminals of 140-01 cable adapter Current ranges All DC and AC current ranges are connected to calibrator’s +I/-I terminals. When using the current output under heavy load (10 to 30 A), the runtime is limited to 0 to 60 s. The runtime depends on the set current and it is controlled by the microprocessor.

  • Page 106: Powermeters

    M-142 Multifunction Calibrator MEATEST, s.r.o. Connection of a multimeter to be calibrated (current range) to calibrator’s output terminals Optional current coil can extend the calibrator’s current range to 1000 A. The coil can be used for calibration of both DC and AC ammeters. The clamps of the ammeter must be positioned in angle 90 to the coil.

  • Page 107: Tab. 18 Recommended Way Of Signal Terminal Grounding

    MEATEST, s.r.o. M-142 Multifunction Calibrator In the P-E mode, the permitted load of the voltage and current outputs is the same as in the voltage and current modes. If the output is overloaded, the calibrator disconnects the output terminals and displays an error message.

  • Page 108: Counters And Oscilloscopes

    M-142 Multifunction Calibrator MEATEST, s.r.o. Counters and oscilloscopes The calibrator can be used for basic calibration of the frequency ranges of multimeters and simple counters. The calibrator provides the following functions: • calibration of frequency functions up to 20 MHz using squarewave signal. The function is activated by pressing F direct mode button and selecting HF mode.

  • Page 109: Measurement Using The Calibrator

    MEATEST, s.r.o. M-142 Multifunction Calibrator deactivated (INPUT OFF), cold junction temperature (RJ) can be set manually only. Connection of device under test is similar to the voltmeter connection. • using 140-01 cable adapter and OUTPUT terminals. Temperature of cold junction must be compensated by manual setting of RJ value.

  • Page 110: Measurement Of Temperature Using Thermocouples

    M-142 Multifunction Calibrator MEATEST, s.r.o. Connection of Pt100 sensor using Opt. 60 cable: Measurement of temperature using thermocouples The built-in multimeter allows the measurement of mV DC and temperature using external thermocouple. Option 80 cable adapter is required. Temperature of cold junction must be set manually. To activate the measurement, select T TC function mode using METER button in the function menu and press INPUT to measure the input value.

  • Page 111: Option 80 Application

    Option 140-70 is applicable only for four-wire simulation of resistance Option 140-41 belongs to M-140 model accessory however measuring section of the option (field INPUT) can be applied for M-142 model as well. Option 90 application Option 90 is Pt 1000 external temperature sensor suitable for automatic compensation of cold junction when simulating TC temperature sensors.

  • Page 112: Examples Of Tests

    M-142 Multifunction Calibrator MEATEST, s.r.o. Examples of tests Examples of applications Sourcing/simulating Measurement Application Pt 100 temperature 10 V / 20 mA / f Calibration of temperature evaluation units, setting of sensor temperature regulators TC temperature sensor 10 V / 20 mA / f...

  • Page 113: Specification

    MEATEST, s.r.o. M-142 Multifunction Calibrator Specification Uncertainties include long-term stability, temperature coefficient, linearity, load and line regulation and the traceability of factory and National calibration standards. Specified accuracy is valid after one hour warm up in temperature range 23 ± 2 C.
  • Page 114 M-142 Multifunction Calibrator MEATEST, s.r.o. valid for frequencies to 10 kHz Function Shape voltage range: 1 mV to 200 V wave form: square, positive, negative, symmetrical, ramp A, ramp B, triangle truncated sin with THD 13,45 % peak value uncertainty: 0.3 % + 50 uV...
  • Page 115 MEATEST, s.r.o. M-142 Multifunction Calibrator wave form: square, positive, negative, symmetrical, ramp A, ramp B, triangle truncated sin with THD 13,45 % peak value uncertainty: 0.3 % + 500 nA displayed values: peak, effective Minimum frequency for squarewave signals is 0.1 Hz, for all others 20 Hz.
  • Page 116 M-142 Multifunction Calibrator MEATEST, s.r.o. DCV uncertainty See table of DCV uncertainty. DCI uncertainty % value + μA Range Max. compliance voltage [V] 2.00000 mA – 20.00000 mA 0.05 + 2 20.0000 mA – 200.0000 mA 0.05 + 10 0.200000 A – 2.000000 A 0.05 + 100...
  • Page 117 MEATEST, s.r.o. M-142 Multifunction Calibrator For dPF* is valid following formula: dPF* = (1 – sin (+d)/sin ) * 100 Example: U = 100 V, I = 10 A, cos  = 0.5, f = 50 Hz, displayed value of active power in W...
  • Page 118 M-142 Multifunction Calibrator MEATEST, s.r.o. Temperature sensors simulation temperature scale: ITS 90, PTS 68 types of sensors: RTD, TC A. RTD (resistance) sensors types: Pt 1.385, Pt 1.392, Ni 20  to 2 k range of R0 setting: temperature range:...

  • Page 119: Tab. 1 Functions

    MEATEST, s.r.o. M-142 Multifunction Calibrator Multimeter Functions: DC voltage DC current resistance, temperature Ranges and uncertainties function total range uncertainty (%) resolution / range 0.01 % + 500 V DC voltage - DCV 0 to +/-20.0000 V 100V / 10V 0.02 % + 7 V...

  • Page 120: Accessories

    M-142 Multifunction Calibrator MEATEST, s.r.o. General data Warm up time: 60 minutes Specification interval: 1 year Specification confidence level: 99 % 23 ± 10 C, relative humidity < 75% Range of working temperatures: Temperature coefficient for temperature outside of Tcal ±2 °C Temperature coefficient between +13 °C to +33 °C is 0.1 x /°C...
  • Page 121 MEATEST, s.r.o. M-142 Multifunction Calibrator Manufacturer and service tel: +420 – 543 250 886 MEATEST, s.r.o fax: +420 – 543 250 890 Zelezna 3, 619 00 Brno Czech Republic meatest@meatest.cz www.meatest.com User Manual v48...

  • Page 122: Operation Manual Supplement

    M-142 Multifunction Calibrator MEATEST, s.r.o. Operation Manual Supplement Manual Title: M142 Issue date: 1/2014 Supplement issue: This supplement contains information necessary to ensure the accuracy of the above manual. Change 1 On page 115 the original text under the table “Resistance uncertainty” has been replaced with the following: Specification is valid for four-terminal connection using Option 70 Cable adapter.

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