Agilent Technologies L4400 manual Alarm Limits, Initiate the scan close first channel

3Operating and Programming

•You can configure the list of channels for 4-wire external scanning. When enabled, the instrument automatically pairs channel n in Bank 1 with channel n+20 in Bank 2 to provide the source and sense connections. For example, make the source connections to the HI and LO terminals on channel 2 in Bank 1 and the sense connections to the HI and LO terminals on channel 22 (or 37) in Bank 2.

To configure the instrument for 4-wire external scanning, send the following command.

ROUTe:CHANnel:FWIRe {OFFON}, (@<ch_list>)

The following program segment configures a separate DMM and the L4421A for one pass through a scan list of 10 channels (Figure 3-14).

CONF:RES AUTO, DEF	Configure DMM function (resistance)
TRIG:SOUR EXT	Set DMM trigger source
TRIG:COUN 10	Set DMM trigger count
INIT	Put DMM in wait-for-trigger state
ROUT:SCAN (@1001:1010)	Set L4421A scan list
ROUT:CHAN:ADV:SOUR EXT	Set L4421A channel advance source
INIT	Initiate the scan (close first channel)

The L4400 Product Reference CD-ROM (p/n 34989-13601) included with the L4400 instruments contains complete examples (VISA, VISA-COM, IVI-COM) of scanning L4421A channels using a separate DMM. The example is in the folder “Mux_L4421A.”

Alarm Limits

Usage:

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

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

You can configure the instrument to generate an alarm when a specific bit pattern or bit pattern change is detected on a digital input channel

or when a specific count is reached on a totalizer channel of the L4450A and L4452A. These channels do not have to be part of the scan list to generate an alarm. Alarms are evaluated continuously as soon as you enable them.

There are two alarm paths that can be configured to alert you when specific alarm conditions are encountered during a scan. You can assign multiple channels to either of the two available alarms (ALARm1, ALARm2).

Alarm data can be stored in one of two locations depending on whether a scan is running when the alarm occurs.

84 L4400 User’s Guide