Fluke 91 Series II User Manual page 137

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B. STABILIZING THE TRACE DISPLAY
On the left bottom of the waveform display you see a
readout of "5 ms", which is the horizontal time base of the
trace. The 5 ms/DIV is the slowest time base used in the
autorange mode and gives measurements down to 15 Hz.
To manually select a slower time base:
8. Press .
Continue pressing the
readout is 100 ms. The digital display should now be stable
and show a reading of about 2 volts. The waveform display
is also stable. To increase the waveform amplitude, select
the 3V range:
9. Press of INPUT A to select the 3V range.
The ScopeMeter test tool has a DC overrange capability to
4500 counts, which is 4.5V for the 3V range; therefore, you
will see the 4V high level of this signal even though the 3V
range has been selected as shown in Figure 8-5.
key until the time base
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Figure 8-5 Displaying DC Overranging
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