Acquiring Waveforms; Choosing Recurrent Or Single Acquisition; Roll Mode - Fluke 91 Series II User Manual

Using the Scope Mode

ACQUIRING WAVEFORMS

Choosing Recurrent or Single Acquisition

You can instruct the ScopeMeter test tool to continuously
update its display, giving you a dynamic look at waveform
activity as it occurs (RECURRENT). You can also tell the
test tool to update its display only once, yielding a snapshot
record of waveform activity (SINGLE), termed "Single-
Shot" elsewhere in this manual.
From the Scope Submenu, press
RECURRENT for continuous display updates. Pressing
stops and starts an acquisition. A HOLD on the top
right of the display indicates that acquisition is stopped.
The time base range is 5ns (10ns)/DIV to 1s/DIV.
Set up the ScopeMeter test tool for "Single-Shot" acquisi-
tions with the following procedure:
1. Press to select SINGLE (highlighted).
NO TRIG begins flashing on the display. The instrument
is waiting for a trigger.
RUN appears on the display when the single acquisi-
tion is triggered. HOLD then reappears when acquisi-
tion is completed.
2. Now press again and wait for another single
acquisition trigger.
The time base range is 100ns/DIV to 1s/DIV.

Roll Mode

Roll mode supplies a visual log of waveform activity and is
especially useful when measuring lower frequency
waveforms. To enter the Roll mode, press
RECURRENT, then press
10s/DIV, 20s/DIV, or 60s/DIV.
The waveform is now slowly traced on the display from left
to right until the full screen is written. Then the trace slowly
shifts from right to left like a pen-recorder. The Roll mode is
to highlight
automatically turned off if a time base of 1s/DIV or faster is
selected.
Roll is an untriggered mode. The Capture length and
Single-Shot functions are not available. However, the
waveform can be frozen on the display by pressing
5 - 7
to select
to select 2s/DIV, 5s/DIV,
.