Agilent 34980A  Multifunction Switch/Measure Unit *34980-90005*

3 Features and Functions
ABus1 HI
ABus2 HI
ABus3 HI
ABus4 HI
Analog Bus Connector
9
6
5
1
ABus1 LO
ABus2 LO
ABus3 LO
ABus4 LO
34980A
Chan Adv In
GND
Chan Closed Out
Ext Trig Connector
For an externally- controlled scan, you must either remove the internal
DMM from the 34980A or disable it (see “Internal DMM Disable” on
page 153). 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 112.
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.
130 Agilent 34980A Mainframe User’s Guide
6
9
1
5
External DMM
VM Complete Out Ext Trig In