Features and Functions 4
Keysight 34970A/34972A User’s Guide 105
– Each time you start a new scan, the instrument clears all readings (including
alarm data) stored in reading memory from the previous scan. Therefore, the
contents of memory are always from the most recent scan.
– While a scan is running, the instrument automatically stores the minimum and
maximum readings and calculates the average for each channel. You can read
these values at any time, even during a scan.
– Mx+B scaling and alarm limits are applied to measurements during a scan and
all data is stored in non-volatile memory. You can read the contents of reading
memory or the alarm queue at any time, even during a scan.
– In the Monitor function, the instrument takes readings as often as it can on a
single channel, even during a scan (see Single-Channel Monitoring on
page 179). This feature is useful for troubleshooting your system before a test
or for watching an important signal.
– If you abort a scan that is running, the instrument will complete the one
measurement in progress (the entire scan will not be completed) and the scan
will stop. You cannot resume the scan from where it left off. If you initiate a new
scan, all readings are cleared from memory.
– When you add a multiplexer channel to a scan list, that entire module is
dedicated to the scan. The instrument issues a Card Reset to open all channels
on that module. You cannot perform low-level close or open operations on any
channels on that module (even those channels that are not configured).
– While a scan is running, you can perform some low-level control operations on
modules that do not contain channels in the scan list. For example, you can
open or close channels or issue a Card Reset on switching modules that do not
contain channels in the scan list. However, you cannot change any parameters
that affect the scan (channel configuration, scan interval, scaling values, alarm
limits, Card Reset, etc.) while a scan is running.
– When you add a digital read (multifunction module) to a scan list, that port is
dedicated to the scan. The instrument issues a Card Reset to make that port
an input port (the other port is not affected).
– While a scan is running, you can perform low-level control operations on any
channels on the multifunction module that are not in the scan. For example,
you can output a DAC voltage or write to a digital port (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.
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