Setting The Trigger Delay - Fluke 8845A User Manual

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.
2. Press the soft key labeled TRIGGER. If the Meter is in external trigger mode, the
soft key label EXT TRIG will be highlighted in the display.
3. 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
each trigger or pulse received, the Meter will take the specified number of measurements
after the specified trigger delay.
The trigger key is disabled whenever the Meter is in Remote mode.
To set up for an external trigger:
1. Press L.
2. Press the soft key labeled TRIGGER.
3. Press the soft key labeled EXT TRIG.
The Ext Trig soft key label will remain highlighted to indicate the Meter is in
external trigger mode. To return to auto trigger mode, press EXT TRIG again.
If the Meter does not receive a trigger for a few seconds, a TRIG annunciator
illuminates indicating the Meter is waiting for a trigger and a lightning bolt appears
indicating the Meter does not know what voltage is applied to the terminals. Each
press of the trigger key W or an active low pulse on the trigger port will initiate a
measurement.

Setting the Trigger Delay

A Meter measurement can be delayed a set amount of time after receiving a trigger. This
feature may be useful when you need to wait for a signal to settle before measuring it.
When a trigger delay is specified, that delay is used for all functions and ranges.
To set a trigger delay:
1. Press L.
2. Press the soft key labeled TRIGGER.
3. Press the soft key labeled SET DELAY.
The trigger delay can be set between 0 and 3600 seconds with a resolution of 10
microseconds.
Note
Note
Front-Panel Operation
Controlling Trigger Functions
3
3-17