Fluke 8846A FE 8845A & 8846A Users Manual - Page 55

Controlling Trigger Functions, Choosing a Trigger Source, Auto Triggering, External Triggering

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3 Front-Panel Operation Controlling Trigger Functions The display will start adjusting the bar graph as the number of readings accumulates. The mean and standard deviation values also change in accordance with the collected readings. To start the histogram session over, press the STOP soft key followed by the RESTART soft key. To stop the histogram session, press B or the STOP soft key. Controlling Trigger Functions The Meter's trigger functions allows you to select a measurement trigger source, set the number of measurements (samples) per trigger, and set the delay time between receiving the trigger and the start of a measurement. In addition, the trigger function provides a "measurement complete" signal on the trigger port on the rear panel. See item 5 in table 3-3. Triggering the Meter remotely through one of its communication interfaces is covered in the Programmers Manual. The following sections discuss triggering the Meter automatically (internal trigger), or externally using the trigger key on the front panel and the trigger connector on the rear-panel. Setup and control of the trigger function is accessible through the Meter's Measurement Setup key L. Choosing a Trigger Source There are four possible sources for triggering a Meter measurement: automatic, front panel trigger key W, external, and remote. With the exception of remote triggering, trigger source selection is through the trigger menu, found under the measurement setup menu. To select a trigger source: 1. Press L to see the measurement setup menu. 2. Press the TRIGGER  soft key to reveal the trigger control selections. Note Setting the Meter to trigger via a remote command is only accessible through the remote interface. See the "Triggering" section in the Programmers Manual for more information on remote triggering. Auto Triggering In auto trigger mode, the Meter's measurements are triggered by internal circuitry. These triggers are continuous and occur as fast as the configuration will allow. Auto triggering is the Meter's power-on trigger source. To return the Meter to auto trigger mode, 1. Press L. If the Meter is in external trigger mode, the soft key label EXT TRIG will be highlighted in the display. 2. Press the soft key labeled EXT TRIG External Triggering In the external trigger mode, a Meter measurement starts each time a low-true pulse is sensed on the external trigger connector or the front-panel trigger key W is pressed. For 3-15

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Front-Panel Operation
Controlling Trigger Functions
3
3-15
The display will start adjusting the bar graph as the number of readings accumulates. The
mean and standard deviation values also change in accordance with the collected
readings.
To start the histogram session over, press the
STOP
soft key followed by the
RESTART
soft key.
To stop the histogram session, press
B
or the
STOP
soft key.
Controlling Trigger Functions
The Meter’s trigger functions allows you to select a measurement trigger source, set the
number of measurements (samples) per trigger, and set the delay time between receiving
the trigger and the start of a measurement. In addition, the trigger function provides a
“measurement complete” signal on the trigger port on the rear panel. See item 5 in table
3-3. Triggering the Meter remotely through one of its communication interfaces is
covered in the Programmers Manual. The following sections discuss triggering the Meter
automatically (internal trigger), or externally using the trigger key on the front panel and
the trigger connector on the rear-panel.
Setup and control of the trigger function is accessible through the Meter’s Measurement
Setup key
L
.
Choosing a Trigger Source
There are four possible sources for triggering a Meter measurement: automatic, front
panel trigger key
W
, external, and remote. With the exception of remote triggering,
trigger source selection is through the trigger menu, found under the measurement setup
menu.
To select a trigger source:
1.
Press
L
to see the measurement setup menu.
2.
Press the
TRIGGER
soft key to reveal the trigger control selections.
Note
Setting the Meter to trigger via a remote command is only accessible
through the remote interface. See the “Triggering” section in the
Programmers Manual for more information on remote triggering.
Auto Triggering
In auto trigger mode, the Meter’s measurements are triggered by internal circuitry. These
triggers are continuous and occur as fast as the configuration will allow. Auto triggering
is the Meter’s power-on trigger source.
To return the Meter to auto trigger mode,
1.
Press
L
.
If the Meter is in external trigger mode, the soft key label
EXT
TRIG
will be
highlighted in the display.
2.
Press the soft key labeled
EXT
TRIG
External Triggering
In the external trigger mode, a Meter measurement starts each time a low-true pulse is
sensed on the external trigger connector or the front-panel trigger key
W
is pressed. For