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Operating and Programming 3
L4400 User’s Guide 83
This handshake sequence continues until all channels are scanned and the
programmed number of passes (sweeps) through the scan list are complete.
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.
Channel closed (out)
Gnd
Channel advance (in)
VM Complete
(Out)
Ext Trig
(In)
L4421A
DMM
5
1
9
6
HI
LO
I
LO
HI
1
5
6
9
ABus1-Hi
ABus1-Lo