Keithley 2182, User Manual, Page: 129 / 339

External triggering
The EX TRIG key selects triggering from two external sources: trigger link and the TRIG key.
When EX TRIG is pressed, the TRIG annunciator lights and dashes are displayed to indicate the
instrument is waiting for an external trigger. From the front panel, press the TRIG key to trigger
a single reading. Pressing the EX TRIG key again toggles back to continuous triggers.
The Model 2182 uses two lines of the Trigger Link rear panel connector as External Trigger
(EXT TRIG) input and Voltmeter Complete (VMC) output. The EXT TRIG line allows the
Model 2182 to be triggered by other instruments. The VMC line allows the Model 2182 to
trigger other instruments.
At the factory, line 1 is configured as VMC and line 2 as EXT TRIG. (Changing this
configuration is described in the Model 2182 Service Manual.) A connector pinout is shown in
Figure 7-3 .
Figure 7-3
Rear panel pinout
Rear Panel Pinout
1
2
3 4 5
6 7 8
Pin 2
External
Trigger
Input
Pin 1
Voltmeter
Complete
Output
Pin Number Description
1
2
3
4
5
6
7
8
Voltmeter Complete Output
External Trigger Input
No Connection *
Signal Ground
No Connection *
No Connection *
No Connection *
Signal Ground
* Either pin 3 or 5 may be configured as an output instead of pin 1.
Either pin 4 or 6 may be configured as an input instead of pin 2.
See the Model 2182 Service Manual for details.
Triggering 7-7