Keysight 34980A - Page 172

3 Features and Functions
172 Keysight 34980A Mainframe User’s Guide
– For an externally-controlled scan, you must either remove the internal DMM
from the 34980A or disable it (see “Internal DMM Disable” on page 198). Since
the 34980A’s internal DMM is not used, readings from multiplexer channels are
stored in the external DMM’s memory.
– In this configuration, you must set up a scan list to include all desired
multiplexer or digital channels. Channels which are not in the list are skipped
during the scan. By default, the instrument scans the list of channels in
ascending order from slot 1 through slot 8 (channels are reordered as needed).
– 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 152.
– You can configure the event or action that notifies the 34980A 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.
1
5
6
9
5
1
9
6
ABus1 HI
ABus2 HI
ABus3 HI
ABus4 HI
ABus1 LO
ABus2 LO
ABus3 LO
ABus4 LO
Chan Adv In
GND
Chan Closed Out
34980A
External DMM
VM Complete Out Ext Trig In
Analog Bus Connector
Ext Trig Connector