MEATEST
M133C Electric Power/Energy Calibrator
Operation manual
64
10
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:
81/2 digit multimeter type HP3458A or Fluke 8508A, or other type with accuracy 0.01 % on
AC voltage
Multifuntion calibrator MEATEST M142 or M140 with DCranges 10V, 20mA and AC range
10V / 15kHz.
resistance shunt 10 m
, 100 m
Burster 1280, or other type with accuracy 0.01% with known
AC/DC difference to 1 kHz
counter HP 53181A, HO 53130, BM 642 or other with accuracy 0,001 %
powermeter 0.02- 0.05 % like Zimmer LMG95REF, Applied Precision RS2110S
HP8903A Distortion analyzer and scope with bandwidth min. 20 MHz. 100 khz bandwidth is
recommended for THD measuring of AC signals.
Configuration of the calibrator
Calibrator should be tested directly from the front panel terminals To suppress influence of noise
or interference with power line frequency in measuring circuit it is recommended following setting
of the calibrator (in Main menu):
1.
Current coil
Coil Off
2.
Voltage sources GND
GndU On
3.
Current sources GND
GndI On
Note:
If it is grounded neither calibrator nor standard meter, higher level can occur on the
output terminals.
In general, when calibrator is connected to the standard meter, ground loops can be
arise through power line connection. Ground loops can result apparently worse
noise, short term stability or non-harmonic distortion of output signal. If necessary
use toroidal chokes to suppress this products.
Use sin waveform of the output signal on all AC tests.
