Agilent 34980A  Multifunction Switch/Measure Unit 34980-90005

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3 Features and Functions Remote Interface Operation: The following command retrieves stored readings from memory (the readings are not erased). FETCh? Use the following commands to query the statistics on the readings stored in memory for a specific channel or from the internal DMM. These commands do not remove the data from memory. CALC:AVER:MIN? (@3005) CALC:AVER:MIN:TIME? (@3005) CALC:AVER:MAX? (@3005) CALC:AVER:MAX:TIME? (@3005) CALC:AVER:AVER? (@3005) CALC:AVER:COUNT? (@3005) CALC:AVER:PTPEAK? (@3005) The following command retrieves the last reading taken on channel 1 on the module in slot 3 during a scan. DATA:LAST? (@3001) The following command clears the contents of statistics memory for the selected channel. CALC:AVER:CLEAR (@3001) Use the following command to determine the total number of readings stored in memory (all channels) from the most recent scan. DATA:POINTS? The following command reads and clears the specified number of readings from memory. This allows you to continue a scan without losing data stored in memory (if memory becomes full, new readings will overwrite the first readings stored). The specified number of readings are cleared from memory, starting with the oldest reading. DATA:REMOVE? 12 Minimum reading on channel Time minimum was logged Maximum reading on channel Time maximum was logged Average of all readings on channel Number of readings taken on channel Peak- to- peak (maximum–minimum) 126 Agilent 34980A Mainframe User’s Guide
Monitor Mode Features and Functions 3 In the Monitor mode, the instrument takes readings as often as it can on a single channel or the internal DMM, 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 channel or the totalizer count on the digital modules. You can also monitor measurements on the internal DMM, independent of any channel measurements. 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. The Monitor mode is equivalent to making continuous measurements on a single channel or the internal DMM 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. A scan in progress always has priority over the Monitor function. Channels do not have to be part of an active scan list to be monitored; however, the channel must be configured for a measurement in order to be monitored. The Monitor mode ignores all trigger settings and takes continuous readings on the selected channel using the IMMediate (continuous) source. The Monitor mode is automatically enabled on all channels that are part of the active scan list. If you define the scan list after monitoring has already been enabled, any channels that are not part of the active scan list will be ignored during the monitor operation (no error is generated). 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). 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). If a channel that is currently being monitored is manually closed or opened, the Monitor operation will be disabled on that channel. Agilent 34980A Mainframe User’s Guide 127
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2 Getting Started 62 Agilent 34980A
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Agilent 34980A  Multifunction Switch/Measure Unit 34980-90005