Meatest M143 User manual

Multifunction calibrator M142 is calibrator of electric quantities for application in calibration
laboratories and in production lines where voltage, current, resistance, capacity and frequency meters
are manufactured. Load capacity of the voltage output is 30 mA - enough for most high-consumption
analogue power-meters. Installed harmonic and non-harmonic shape signals allow for testing meter
sensitivity to distorted signals by a signal with various crest factor. Frequency modes, suitable for
calibration of multimeters and time bases of oscilloscopes, have adjustable 6-digit frequency, amplitude
and duty ratio of the output signal. The calibrator can measure temperature with TC and RTD
temperature sensors to show it on display or use for cold junction compensation.
Main control segments of the calibrator are:
1. Output terminals - Output signal is connected to the output terminals. Current ranges are
connected to A+I / -I terminals. Voltage, resistance, TC sensor simulation and frequency
functions are available at V Hi / Lo terminals.
2. Display
3. Numerical keypad - Numerical values can be entered from the keyboard. ENTER button is used
to confirm the selection. ESC button can be used to cancel the entry.
MENU button - Open Main menu of the instrument (parameters setting).
Select button –Select value you want to change.
ESC button –Exit / Cancel button.
Enter button –Confirmation button.
4. Button for function selection.
5. OPER button - Turns output ON/OFF according to selected function and parameters.
6. Cursor buttons - The keyboard includes two buttons (<, >) which allow the cursor to be set to
the required position at the display. Remaining two buttons (, ) allow the user to increase or
decrease the number at the cursor.
7. Display button output/input - Three buttons located under the display has alternative meaning.
Their actually valid function is labeled on the display.
8. Auxiliary output/input - The auxiliary connector is aimed as input for Opt 143-90 external
Pt1000 temperature sensor. Another function is output of RTD temperature sensor simulation
using Opt 143-60.

Display is divided into several sections with following meaning:
1. Main field - Main value. Can be edited via numerical input or cursor keys or rotary. Symbol on
the right represents signal shape.
2. Time field - displays time
3. Information field - In the field some additional information are displayed:
-Output terminals - Symbol of output ON (rectangle symbol) or output OFF. In parallel LED
diode is turning on/off above the OPER button.
-Local/Remote control - In remote control label REM is displayed, in manual mode label
LOCAL is shown.
-Output current simulated by current coil Opt. 140-50, if the coil is connected to the output
current terminals. Access to this function is through SETUP MENU.
-Grounding of Lo/-I terminals.
-Selected TC temperature sensor in TC sensor simulation mode.
4. Accuracy field - Currently valid accuracy of the main parameter. It is calculated from
specification of the calibrator and it is displayed in %.
5. Display button field - Labels related to the display buttons. Meaning is as follows:
6. Auxiliary parameter field - Auxiliary parameters of the output signal are displayed. To these
parameters belong:
-Set relative deviation in % (max 30.000 %)
-Frequency of AC voltage/current
-Temperature of cold junction in TC temperature sensor simulation mode, type of TC sensor

There are located power line entry module with line socket, fuse, power line voltage selector and mains
switch, RS-232 connector (GPIB connector optionally), grounding post and model plate number with
serial number. The grounding post is galvanically connected to metal parts of housing and protection
earth terminal in power line socket
Between output terminals and protection earth potential following maximal voltages are allowed:
Hi - GND: 1100VRMS
+I - GND: 10VRMS
Lo - GND: 10VRMS
- I - GND: 10VRMS
1. Model plate
2. Fan outlet cover
3. Power cord module
4. Grounding post
5. GPIB connector (optional)
6. RS-232 connector
Every M143 Portable Multifunction Calibrator delivery includes following items:
-USB stick with user manual 1 pc
-Factory calibration certificate 1 pc
-Power cord (with European E-type plug, feel free to ask for other types when ordering) 1 pc
-Spare fuse 1 pc
-RS232 cable 1 pc
-Test cable 1000 V / 20 A 2 pcs
Following accessory is not part of standard delivery and can be extra ordered:
-Option 143-90 Pt1000 Temperature sensor
-Option 143-60 Cable adapter

The calibrator can be integrated into automated calibration systems (ATS) and generally controlled from
remote computer via following remote control interfaces:
-RS232
-GPIB (IEEE488) (option)
When controlled remotely, maximum ratings of calibrator’s output signals as well as all other
specifications are the same as in manual mode.
Meatest software package WinQbase + Caliber is recommended for best automationresults. This system
is designed for automated and semi automated calibrations of digital and analogue meters including
uncertainty calculation, result evaluation and certificate printing according to ISO 17025 standard.
Only one interface can be used for communication at any given time. Default active interface is RS232,
other interfaces can be selected in MENU. To establish connection between the calibrator and computer,
set interface settings in your computer accordingly:
-COM port see available COM ports in Windows Device Manager
-Baudrate RS232 according to MENU->Interface->RS232 Baudrate (9600 by default)
-Data bits 8
-Stop bits 1
-Parity None
-Handshake (XON/XOFF) Off
-GPIB Address according to MENU ->GPIB Address (2 by default) (option)
See M143 SCPI manual for complete SCPI reference, more details on communication setup and
troubleshooting.

Inspect package contents when unboxing the calibrator for the first time. See chapter 1.3 for complete
list of accessories.
Place the instrument on a level surface before powering on and let it stabilize for at least one hour if the
instrument has been stored outside of reference temperatures beforehand.
The instrument has been designed according to IEC 61010-1 + A2 amendment of sthe standard. Safety
is ensured by design and by use of specific components. The manufacturer is not liable for the damage
caused by modification of the construction or replacement of parts with non-original ones.
Safety symbols used on the equipment:
Warning, risk of danger.
Warning - risk of electric shock. Hazardous voltage above 50 V DC
or AC might be present.
Protective earth.
To prevent possible electrical shock or personal injury:
-Read carefully safety information before you use the Product.
-Do not alter the Product and use only as specified, or the protection supplied by the Product can be
compromised.
-Do not use the Product if it is altered or damaged.
-Use this Product indoors only.
-Use power cord approved for local mains voltage and plug configuration and rated for the Product.
-Keep hands away from all Product terminals and exposed metal cable parts during operation. High
voltage on those may be cause death or serious injury.
-Do not connect the calibrator to other voltage than set by the voltage selector.
-Do not block the vent openings located at the rear panel, bottom panel and prevent dust and
moisture contamination.
-Whenever possible ground Lo output terminals (GndU On, GndI On).
-Do not overload the power stages by leaving the calibrator switched on with the load connected for
a long time especially on 20 A current range and 1000 V voltage ranges.

The calibrator is designed for operation from 115/230 V –50/60 Hz power line voltage. Before the first
connecting the calibrator to the mains, check the position of the mains voltage selector located at the
rear panel. If the set voltage differs from your power line voltage power line selector must be switched
over as described below:
-Insert flat end of a screwdriver to the slot in power line socket on the rear panel. Wind with the
screwdriver slightly to pull out the holder with fuse and selector contacts.
-Place the contacts in such position, that correct power line voltage can be read in the rear window.
-Push the holder back to the power line socket. In the window correct voltage (115 or 230 V) must
be seen. Use position 115 V for nominal mains voltage 110 to 130 V and 230 V position for range
220 to 240 V.
Plug one end of the power cord into connector on the rear panel and connect the other end of the power
cord into a wall outlet. Turn the calibrator on with mains switch right next to it.
The calibrator works after it is switched on and the initial checks complete. Specified parameters are
only guaranteed after the instrument warms up. During this period, the instrument cannot be calibrated.
The display shows “cannot access the calibration” message if calibration is attempted during this period.
Push FUNC button to see table with available functions. Requested function can be selected using cursor
buttons or directly by pushing numerical button with number of the function, with confirmation by
ENTER. Following functions are available:
1. DC voltage
2. DC current
3. AC voltage
4. AC current
5. Resistance
6. Frequency
7. TC temperature sensor simulation
8. RTD temperature sensor simulation (optionally)
Once a function is selected, you can change the main value as well as auxiliary output parameters
Function parameters can be edited in three ways:
-Numeric keypad. Write a value directly and confirm either by softkey with appropriate unit or
ENTER button to set value in base unit (for example V).
-Cursor keys. Push or buttons to increment/decrement selected digit by one. Move through
parameter digits using < and > buttons.
-Softkeys. Values of most parameters can be also changed by softkeys x10 and :10, which change
value by order of magnitude and +/- softkey which switches polarity or Shape softkey that will
change shape of signal.
Described methods change the main parameter by default. If there are any other parameters on display,
you can switch between them using (SEL) select button.