MEATEST
M133C Electric Power/Energy Calibrator
Operation manual
56
7.4
Full calibration procedure
Required instruments
Following pages describe procedure of the full calibration. Following instruments are required for
calibration:
81/2 digit multimeter type HP3458A or Fluke 8508A, or other type with accuracy
0.001 % on DC voltage
Calibrator Meatest M142 or M140 with DC ranges 10V, 20mA a AC range 10V /
10kHz.
Resistance shunt 10 m
, 100 m
Burster 1280, or other type with accuracy 0.01%
Counter HP 53181A, HO 53130, BM 642 or other with accuracy 0,001 %
Powermeter 0.02- 0.05 %, Zimmer LG95 or better
HP8903A Distortion analyzer and scope with bandwidth min. 20 MHz are recommended for THD
measuring of AC signals.
Calibration procedure
1.
Connect the calibrator and the multimeter to the mains and let them switched on for at least
three hours in a laboratory at 23
1
o
C.
2.
Press Menu button to call up the Main menu, select Calibration end press Select softkey to
enter the calibration menu.
3.
Enter the calibration code and press Enter button (default calibration code is “0”).
4.
AC voltage ranges calibration
a)
Connect the voltage input terminals of the multimeter to the VOLTAGE OUTPUT
HI - LO terminals of the calibrator.
b)
Select Voltage AC#1 from the calibration menu and confirm by pressing Select
softkey. Switch calibrator’s output terminals ON.
c)
Follow the instructions provided on the calibrator’s display and the ACU table to
adjust the calibrator’s output in the calibration points.
d)
To adjust the calibrator’s output in the calibration points, press Select softkey and
use
,
,
,
cursor buttons, rotary knob or numeric keyboard to adjust the output
voltage. Confirm correctly set value by pressing Write softkey. If you want to skip
the calibration point whose calibration you have already entered, press Exit softkey.
e)
Switch output terminals OFF. Disconnect multimeter and calibrator.
f)
Repeat steps a) to e) also for Voltage AC#2 and Voltage AC#3.
