Choosing The Acquisition Type - Fluke 867B User Manual

Single triggering establishes a fixed trigger point for
the waveform display. The input signal only needs to
cross the trigger amplitude set by the trigger level
and in the direction set by the slope setting. While in
single trigger mode, the frequency counter trigger
circuit sets two predetermined levels that are not
adjustable. This ensures a stable frequency reading
while triggering the waveform with a single trigger.
Dual triggering (the default setting) requires that the
signal pass through both upper and lower trigger
points to trigger the waveform and frequency
counter. These points are initially set based on
percentages of the input signal amplitude. You can
change both levels with the Trigger Softkeys. Dual
triggering provides a more stable waveform display
in noisy environments.
Using View and Trend Display Modes

Choosing the Acquisition Type

Choosing the Acquisition Type
Time > > Single >
Base Trigger Shot
Instead of using the continuous internal trigger, you
can instruct the GMM to update the screen only
once, yielding a retained, snapshot view ("Single
Shot") of an input signal meeting the trigger
requirements. Press 3 from the View Mode
Softkeys.
Yet another selection allows you to display and
monitor only randomly-occurring or fast transient
events or glitches ("Glitch Capture"). Trigger levels
are preset and are not ajustable. The "Glitch" must
have a change rate higher that 1 kHz and an
amplitude > 20% of the selected GMM range.
"Single Shot" and "Glitch Capture" use the same
submenu of softkeys as described in the following
paragraphs.
5
Glitch >
Full
Capture Auto
5-7