Philips SCOPEMETER PM93 Service Manual page 120

CALIBRATION ADJUSTMENT PROCEDURE
5 - 21
M19/20
10:1 calibration for channel A (red) and channel B (grey) probes
19
Purpose: determine the gain, using a 10:1 probe.
Calibration equipment:
Red scope probe (delivered with the ScopeMeter)
Grey scope probe (delivered with the ScopeMeter)
Red adjust adapter (delivered with the ScopeMeter)
Calibration setup:
Red A
~
GENERATOR OUT
A
- -
IMPORTANT: Calibration steps M19 and M20 determine the internal calibration constants that
compensate for probe characteristics. To achieve full accuracy (as listed in the
specifications in chapter 2), calibrations M19 and M20 must be performed, using
the probes that are normally to be used with the instrument.
If the probes delivered with the ScopeMeter are not available at the time of
calibration, use other probes specifically designed for the ScopeMeter. In this
case you must notify the user that these calibrations have been performed,
using different probes. To achieve full accuracy, the user must do a User Probe
Calibration, using his own probes. This procedure is described in the
Scope Meter
Users Manual. Because the results of these User Probe Calibrations