3
Features and Functions
150
Keysight 34980A Mainframe User’s Guide
– While the scan is running, you can perform low-level control operations on any
channels on the digital modules that are not in the scan. For example, you can
output a DAC voltage or write to a digital channel (even if the totalizer is part
of the scan list). However, you cannot change any parameters that affect the
scan (channel configuration, scan interval, Card Reset, etc.) while a scan is
running.
– If a scan includes a read of the totalizer, the count is reset each time it is read
during the scan
only
when the totalizer reset mode is enabled.
– At the end of the scan, the last channel that was scanned will be opened (as
well as any Analog Bus relays used during the scan).Any channels that were
opened during the scan will remain open at the completion of the scan.
– If you abort a scan that is running, the instrument will terminate any reading in
progress (readings are not cleared from memory). If a scan is in progress when
the command is received, the scan will not be completed and you cannot
resume the scan from where it left off. Note that if you initiate a new scan, all
readings are cleared from memory.
– You can use either the internal DMM or an external instrument to make
measurements of your configured channels. However, the 34980A allows only
one scan list at a time; you cannot scan some channels using the internal
DMM and others using an external instrument. Readings are stored in 34980A
memory only when the internal DMM is used.
– The Monitor mode is automatically enabled on all channels that are part of the
active scan list (see
– The present scan list is stored in volatile memory and will be lost when power
is turned off or after a Factory Reset (
*RST
command).
Adding Channels to the Scan List
Before you can initiate a scan, you must set up a scan list to include all desired
multiplexer or digital channels. Channels which are not in the scan 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).
