Operation Basics: Functional Overview
2–8
WFM 90 & WFM 91 User Manual
CAUTION. Instrument Adjustment
Do not attempt to adjust the instrument without using the instructions
listed in the service manual, or your instrument may not meet the
published specifications.
On-Screen Readout
The WFM 90 and WFM 91 use on-screen messages to alert the user
to certain monitoring conditions. Figure 2–3 shows the readout
messages and their locations.
20
40
60
80
100
–20
–40
0
MISSING SYNC
GAIN UNCAL 10uS/DIVEXT REF
VX.XX
LOW BAT
123
4
6
5
Figure 2–3: On-screen readout messages
Readout Description
1 The GAIN UNCAL message appears in the Waveform, Vector, and
Waveform-in-Picture display modes when the Variable Gain mode
has been turned on.
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