Agilent Technologies Switch/Measure User Manual

Page 60

34980A User’s Guide

Features and Functions

Remote Interface Operation:

The following program segment configures the

instrument for a manual scanning operation.

Then, send the

*TRG

(trigger) command to begin each scan sweep.

The

*TRG

command will not be accepted unless the internal DMM is in

the “wait- for- trigger” state.

Note: To stop a scan, press and hold the

Scan (Measure) key.

External Scanning

In this configuration, the instrument sweeps through the scan list once
each time a low- going TTL pulse is received on the rear- panel Ext Trig
Input line (pin 6).

• You can specify a scan count which sets the number of external pulses

the instrument will accept before terminating the scan. See

“Trigger

Count”

on page 49 for more information.

• If the instrument receives an external trigger before it is ready to

accept one, it will buffer one trigger and then ignore any additional
triggers received (no error is generated).

• All readings from the scan are stored in non- volatile memory.

Readings accumulate in memory until the scan is terminated (until the
scan count is reached or until you abort the scan).

• Mx+B scaling and alarm limits are applied to measurements during the

scan and all data is stored in non- volatile memory.

TRIG:SOURCE BUS

TRIG:COUNT 2

INIT

Select bus (manual) mode
Sweep the scan list 2 times
Initiate the scan

Ext Trig Input connector (as viewed from rear of instrument)

Input

5 V

0 V

> 1 µs

Ext Trig Input (Pin 6)

Gnd (Pin 9)