Agilent Technologies 34970A manual Or disable it see Internal DMM Disable on

Chapter 4 Features and Functions

Scanning

•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.

•If a scan includes a read of the totalizer, multifunction module,

the count is reset each time it is read during the scan only when the totalizer reset mode is enabled (TOTalize:TYPE RRESet command or the Advanced menu for the totalizer).

•If you install a module while a scan is running, the instrument will cycle power and resume scanning. If you remove a module while a scan is running, the instrument will cycle power and resume scanning (even if the removed module was part of the scan list).

•You can use either the internal DMM or an external DMM to make measurements of your configured channels. However, the instrument allows only one scan list at a time; you cannot scan some channels using the internal DMM and others using an external DMM. Readings are stored in 34970A memory only when the internal DMM is used.

•If the internal DMM is installed and enabled, the instrument will automatically use it for scanning. For externally-controlled scans, you must either remove the internal DMM from the 34970A

or disable it (see “Internal DMM Disable” on page 145).

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