HP 34970A manual Single-Channel Monitoring

Chapter 4 Features and Functions

Single-Channel Monitoring

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 trouble- shooting 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 ” 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.		4
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 tx	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 t t 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 145). 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).

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