Assisting Continuous Auto Set On Complex Waveforms - Fluke 91 Series II User Manual

Scopemeter series ii
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8 - 10
To make the true RMS voltage measurement on this low
frequency signal, measure Vrms AC+DC in the Measure
Menu:
16. Press
.
17. Press
(V).
18. Use
to highlight Vrms AC+DC METER, and
press
to select.
19. Press
four times to slow the time base to
100 ms/DIV.
The waveform now looks like the DC measurement and a
true Vrms AC+DC measurement is made.
Tip:
In some cases AC coupled measurements give one more
digit of resolution over Vrms AC (DC coupled). When
making low frequency AC measurements with the test tool,
be sure to select Vrms AC (no DC) in the Meter mode, and
ensure the waveform display is stable. If it is not, manually
reduce the time base. Then you can be sure to make
reliable measurements.
91/92/96/99/105
ASSISTING CONTINUOUS AUTO SET ON
COMPLEX WAVEFORMS
In the Scope mode, Auto Set samples the inputs to see
which have signals connected, scales the waveform(s) to fit
on the screen, scales the time base to show a number of
cycles of the waveform, and sets the trigger level to the
best position on the waveform.
Continuous Auto Set gives a stable display of most of the
repetitive waveforms, with some exceptions, which can be
split into three types.
-
Complex Waveforms, such as modulated signals.
-
Slow repetitive signals under 15 Hz. (See "Making
Low Frequency Measurements With the Scope"
further on in this Chapter.)
-
Single Shot signals. (See "Making Single Shot
Measurements With the Scope" further on in this
Chapter.)
The following example covers the first of these unusual
signal areas.
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