M-142 Multifunction Calibrator
MEATEST, s.r.o.
64
User Manual v48
11.
Amplitude calibration in frequency mode
a)
Select FREQUENCY in the calibration menu.
b)
Connect the external multimeter with DC voltage measurement range selected to calibrator’s Hi
- Lo output terminals.
c)
Follow the instructions provided on the calibrator’s display and the F table to adjust the
calibrator’s output in the calibration points. To adjust the calibrator’s output in the calibration
points, use
,
,
,
cursor buttons to adjust the output value. Confirm correctly set value by
pressing WRITE display button.
d)
When calibrating the amplitude of the frequency generation function, DC voltage
corresponding to the amplitude of output square wave signal is set.
12.
Built-in multimeter calibration
Built-in multimeter calibration consists of the calibration of 20 mV, 200 mV, 2V and 10 V voltage
ranges, one 20 mA current range and 200
and 2 k
resistance ranges.
Cable adapters Option 40 – two-wire adapter, Option 60 – four-wire adapter and Option 80 – two wire
adapter are necessary to connect the multimeter.
Due to the fact that the precision of the built-in multimeter is comparable to the precision of the
calibrator in resistance, small voltage and current ranges, external calibrator of higher precision class
should be used to calibrate the built-in multimeter. If external calibrator is not available, the calibrator
can be used to calibrate the built-in multimeter, 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 adapter Option 40.
•
After the value stabilizes, press WRITE display button to write new calibration value.
•
Connect input voltage terminals of external multimeter to Hi – Lo output terminals of the
calibrator. You can use test wires, which are part of basic delivery. Connect Option 40 H input
wire of adapter Option 40 to the Hi output or the calibrator and L input wire of adapter Option
40 to the Lo output on the calibrator. If necessary, adjust the zero point of the external
multimeter before connecting the cables (internal and external multimeters are in parallel).
•
Press SELECT display button to select 10 V calibration point. Red light is lighting, all
terminals on calibrator are automatically ON.
•
“ Output = xx.xxxxxx V “ is displayed in the bottom part of the display, showing the set value
of output voltage. This value can be changed using the potentiometer or cursor button.
•
Adjust the calibrator’s output voltage so that the external multimeter shows 10.0000 V
•
After the value stabilizes, press WRITE display button to write new calibration value. If
calibration in this point is not required, press SKIP. Terminals of multimeter will switch OFF.
•
Disconnect both the external and built-in multimeter.
b)
20 mA DC current range calibration
