Table of Contents
Advertisement
7-34
External trigger scan
For this example, an external instrument is used to trigger the start of the 2-channel scan.
Trigger pulse requirements and trigger cable connections are covered in
klqb
One channel (101) measures temperature and the other channel (102) measures resistance.
The two readings are stored in the buffer. Each time the scan is run, the two readings will
be appended (added) to the buffer.
A thermistor is used to measure temperature. The thermistor is connected directly to the
screw terminals of the switching module.
Operation
A simplified model of external trigger scan operation is shown in
procedure steps and programming commands are listed in
As shown in the operation model, when the scan is enabled, channel 101 closes and the
Model 2790 waits for an external trigger. When the trigger is received, channels 101 and
102 are measured. Operation then returns to the control source where it waits for another
trigger.
klqb
Model 2790 SourceMeter
For this example, the front panel TRIG key can be used in place of an external
input trigger. Each time the TRIG key is pressed, the 2-channel scan will run.
After the scan is enabled
the scan.
®
(Table
7-2, step 5), the TRIG key can be used to trigger
Switch System Reference Manual
Section
8.
Figure
7-5, while the
Table
7-2.
Advertisement
Table of Contents
