Agilent Technologies L4400 Guide de l'utilisateur télécharger pdf (Page 84)

72 L4400 User’s Guide

3 Operating and Programming

Scan Trigger Source

Usage:

• L4421A 40- Channel Armature Multiplexer

• L4450A 64- Bit Digital I/O (digital input, counter channels only)

• L4452A Multifunction Module (digital input, totalizer channels only)

You can configure the event or action that controls the onset of each

sweep through the scan list (a sweep is one pass through the scan list):

• You can set the instrument’s internal timer to automatically scan at a

specific interval. You can also program a time delay between channels

in the scan list (see

“Channel Delay" on page 77).

• You can start a scan when an external TTL trigger pulse is received.

• You can start a scan when an alarm event (L4450A, L4452A) is logged

on the channel being monitored.

Interval Scanning

In this configuration, you control the frequency of scan sweeps by

selecting a wait period from the start of one trigger to the start of the

next trigger (called the trigger- to- trigger interval). If the scan interval is

less than the time required to measure all channels in the scan list, the

instrument will scan continuously, as fast as possible (no error is

generated).



Figure 3-10. Trigger-to-Trigger Interval.

• You can set the scan interval to any value between 0 seconds and

99:59:59 hours (359,999 seconds), with 1 ms resolution.

• Once you have initiated the scan, the instrument will continue

scanning until you stop it or until the trigger count is reached. See

“Trigger Count" on page 75 for more information.

Sweep 1

Trigger 1

Sweep 2

Sweep n

Trigger 2

. . .

Trigger Timer

(0 to 359,999 seconds)

1 2 ... 79 80 81 82 83 84 85 86 87 88 89 ... 280 281

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Agilent Technologies L4400 Guide de l'utilisateur Page 84