149-10A
17
5.1 Calibration of Digitalmeter
Calibrate the 149-10A once a year or more frequently.
■
Instruments required for calibration
To calibrate the 149-10A covering its all measuring ranges, a
standard voltage generator which will provide the following
voltages is required.
AC: 10 kV
±
0.1%
DC: 10 kV
±
0.05%
If you cannot prepare an above standard voltage generator,
calibrate the 149-10A with a calibrator which can generate the
voltage range which you use, or order Kikusui distributor/agent
for calibration.
■
Notes before calibration
•
As a high voltage of 10 kV is dealt with when calibrating the
149-10A, pay full attention for safety.
•
Before calibration, warm up the 149-10A for at least 60
minutes.
■
Calibration
Set the 149-10A in the DC mode, apply a calibration voltage of
10 kV DC to the input terminal of the meter, and so adjust
CALIBRATION (DC) semi-fixed resistor on the side panel of
the 149-10A that it displays 10.000. Next, set the 149-10A in
the AC mode, apply a calibration voltage of 10 kV AC, and so
adjust the CALIBRATION (AC) semi-fixed resistor that the
149-10A displays 10.000. When doing this, the displayed value
may change by about three digits. For calibration, use the
center value. When adjustment for DC measurement is done,
the voltage dividing ratio of the input circuit varies. Be sure to
perform the DC calibration first.
Calibration
Chapter 5
