Keithley 2790, Reference Manual

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Model 2790 SourceMeter
®
Switch System Reference Manual 8-7
Beeper control
The beeper for Hold can be enabled or disabled from the OUTPUT menu as follows:
1. Press SHIFT and then OUTPUT.
2. Use the or key to display the present beeper (BEEP) state: NEVER, OUT-
SIDE, or INSIDE.
3. Perform step a or b:
a. To enable the beeper, use the or key to display OUTSIDE or INSIDE.
b. To disable the beeper, use the or key to display NEVER.
4. Press ENTER. The instrument returns to the normal display state and measurement
state.
External triggering
The EX TRIG key selects triggering from three external sources: trigger link, digital I/O,
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 2790 uses two lines of the TRIG LINK rear panel connector as External Trig-
ger (EXT TRIG) input and Voltmeter Complete (VMC) output. The EXT TRIG line
allows the Model 2790 to be triggered by other instruments. The VMC line allows the
Model 2790 to trigger other instruments.
Line 1 is configured as VMC and line 2 as EXT TRIG. The connector pinout is shown in
Figure 8-3 .
Figure 8-3
TRIG LINK pinout
TRIG LINK
Pinout
1
2
3 4
5
6 7 8
Pin 2
External
Trigger
Input
Pin 1
Voltmeter
Complete
Output
Pin Number
1
2
3
4
5
6
7
8
Description
Voltmeter Complete Output
External Trigger Input
No Connection
No Connection
No Connection
No Connection
Signal Ground
Signal Ground