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Operating Information
WFM 90 and WFM 91 Service Manual
2–9
Calibration Mode. The Calibration mode allows you to adjust the instrument to
factory specifications, if necessary. The Calibration mode is entered by pressing
and holding the CONFIG button for a few seconds. The instrument adjustments
are performed entirely from the front panel with the use of specified input
signals. The instructions for readjusting the instrument to specifications are
located in the Adjustment Procedures section.
CAUTION. Do not attempt to adjust the instrument without using the instructions
listed in the Adjustment Procedures section, or your instrument may not meet the
published specifications.
This instrument uses on-screen messages to alert you to certain monitoring
conditions. Figure 2–5 shows the readout messages and their locations.
20
40
60
80
100
–20
–40
0
MISSING SYNC
GAIN UNCAL 10uS/DIVEXT REF
V1.1
LOW BAT
123
4
6
5
Figure 2–5: On-screen readout messages
Readout Description. Listed below are the corresponding descriptions of the
on-screen readout messages:
H The GAIN UNCAL message appears in the Waveform, Vector, and
Waveform-in-Picture display modes when the Variable Gain mode is
turned on.
H The EXT REF message appears in the Waveform and Vector display modes
when the video signal is locking to an external video reference signal.
H The sweep rate is only displayed in the Waveform display mode. There is no
sweep rate readout when 2 Field sweep is selected.
On-screen Readout