Agilent Technologies L4400 manual External Scanning Using the L4421A and a DMM

Operating and Programming 3

This handshake sequence continues until all channels are scanned and the programmed number of passes (sweeps) through the scan list are complete.

		L4421A	DMM
ABus1-Lo
5	1	HI	HI
9	6	LO	LO
			I
ABus1-Hi		VM Complete	Ext Trig
		(Out)	(In)
Channel advance (in)		Channel closed (out)
	1	5
	6	9
		Gnd

Figure 3-14. External Scanning Using the L4421A and a DMM.

•In this configuration, you must set up a scan list to include all desired multiplexer channels. Channels which are not in the list are skipped during the scan.

•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). The selected source is used for all channels in the scan list. For more information, refer to “Scan Trigger Source" on page 72.

•You can configure the event or action that notifies the instrument to advance to the next channel in the scan list. Note that the Channel Advance source shares the same sources as the (scan) trigger. However, an error is generated if you attempt to set the channel advance source to the same source (other than IMMediate) used for the scan trigger.

•You can specify the number of times the instrument will sweep through the scan list. When the specified number of sweeps have occurred, the scan stops. For more information, refer to “Sweep Count" on page 76.

L4400 User’s Guide 83