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

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3 Features and Functions ABus1 HI ABus2 HI ABus3 HI ABus4 HI Analog Bus Connector 9 6 5 1 ABus1 LO ABus2 LO ABus3 LO ABus4 LO 34980A Chan Adv In GND Chan Closed Out Ext Trig Connector For an externally- controlled scan, you must either remove the internal DMM from the 34980A or disable it (see “Internal DMM Disable” on page 153). Since the 34980A’s internal DMM is not used, readings from multiplexer channels are stored in the external DMM’s memory. In this configuration, you must set up a scan list to include all desired multiplexer or digital channels. Channels which are not in the list are skipped during the scan. By default, the instrument scans the list of channels in ascending order from slot 1 through slot 8 (channels are reordered as needed). You can configure the event or action that controls the onset of each sweep through the scan list (a sweep is one pass through the scan list). The selected source is used for all channels in the scan list. For more information, refer to “Scan Trigger Source” on page 112. You can configure the event or action that notifies the 34980A to advance to the next channel in the scan list. Note that the Channel Advance source shares the same sources as the scan trigger. However, an error is generated if you attempt to set the channel advance source to the same source (other than IMMediate) used for the scan trigger. 130 Agilent 34980A Mainframe User’s Guide 6 9 1 5 External DMM VM Complete Out Ext Trig In
Features and Functions 3 You can specify the number of times the instrument will sweep through the scan list. When the specified number of sweeps have occurred, the scan stops. For more information, refer to “Sweep Count” on page 117. An externally- controlled scan can also include a read of a digital port or a read of the totalizer count on the digital modules. When the channel advance reaches the first digital channel, the instrument scans through all of the digital channels in that slot (only one channel advance signal is required). You can configure the list of channels for 4- wire external scanning without the internal DMM. When enabled, the instrument automatically pairs channel n in Bank 1 with channel n+20 in Bank 2 (34921A, 34923A, 34925A) or n+35 (34922A, 34924A) to provide the source and sense connections. For example, make the source connections to the HI and LO terminals on channel 2 in Bank 1 and the sense connections to the HI and LO terminals on channel 22 (or 37) in Bank 2. Front Panel Operation: To select the channel advance source, choose the following items. Scan (Configure) > ADVANCE CHANNEL > AUTO|EXT|MANUAL To initiate the scan and store all readings in memory, press the Scan (Measure) key. To configure the instrument for 4- wire external scanning, choose the following menu item. Channel (Configure) > FOUR WIRE > OFF|ON Remote Interface Operation: The following program segment configures the instrument for an externally- controlled scan. INST:DMM OFF ROUT:SCAN (@1001:1020) TRIG:SOUR IMM TRIG:COUN 5 ROUT:CHAN:ADV:SOUR EXT INIT Disable internal DMM Configure scan list Set trigger source Set trigger count Set channel advance source Initiate the scan To configure the instrument for 4- wire external scanning, send the following command. ROUTe:CHANnel:FWIRe {OFF|ON}, (@) Agilent 34980A Mainframe User’s Guide 131
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2 Getting Started 62 Agilent 34980A
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Agilent 34980A  Multifunction Switch/Measure Unit *34980-90005*

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