Features and Functions 4
Keysight 34970A/34972A User’s Guide 179
Single-Channel Monitoring
In the Monitor function, the instrument takes readings as often as it can on a
single channel, even during a scan. This feature is useful for troubleshooting your
system before a test or for watching an important signal.
Any channel that can be “read” by the instrument can be monitored. This includes
any combination of temperature, voltage, resistance, current, frequency, or period
measurements on multiplexer channels. You can also monitor a digital input port
or the totalizer count on the multifunction module. Monitoring is not allowed with
the actuator module, the matrix module, or the RF multiplexer modules.
– The Monitor function is equivalent to making continuous measurements on a
single channel with an infinite scan count. Only one channel can be monitored
at a time but you can change the channel being monitored at any time.
– Readings acquired during a Monitor are not stored in memory but they are
displayed on the front panel (however, all readings from a scan in progress at
the same time are stored in memory).
– Mx+B scaling and alarm limits are applied to the selected channel during a
Monitor and all alarm data is stored in the alarm queue (which will be cleared if
power fails).
– A scan in progress always has priority over the Monitor function. The
instrument will take at least one monitor reading per scan sweep and will take
more as time permits.
– You can monitor a multiplexer channel only if the internal DMM is installed and
enabled (see “Internal DMM Disable” on page 175). The channel must also be
configured to be part of the scan list.
– You can monitor a digital input channel or totalizer channel even if the channel
is not part of the scan list (the internal DMM is not required either). The count
on a totalizer channel is not reset when it is being monitored (the Monitor
ignores the totalizer reset mode).
– In the Alarm Scan configuration (see “Scanning on Alarm” on page 114), the
instrument sweeps the scan list once each time a reading crosses an alarm
limit on a channel. In this configuration, you may use the Monitor function to
continuously take readings on a selected channel and wait for an alarm on that
channel. The monitored channel can be part of the scan list but you can also
use a channel on the multifunction module (which does not have to be part of
the scan list and you do not have to use the Monitor function).
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