I am using the NI 9237 to measure weights with a load cell. I am using a full bridge and the createvoltagechannelwithexcitation project in VB.NET It works OK when I use internal voltage for the excitation. I would like to get up to 10 Volts and prefer to use external excitation. So far I am not able to get the external source to function with the NI 9237. I have the RJ50 cable, so I am using the EX+ and EX- terminals on the 9237 to supply the external voltage. When I specify external as the source in the software, I expect the NI9237 to give me whatever voltage I have set for output on my power supply. I should see that at the EX+ and EX- (pins 6 and 7) output from the 9237, ie it should match what I am putting in on the terminals of the four terminal connection. I currently only have wired up two of the four pins for external input (the top EX+ and EX-), but I believe this is fine. To troubleshoot I have a voltmeter across the pin 6 and 7 output. On internal excitation I max out around 8 volts if I specify 10 as the source. On external excitation I get closer to 7.8 volts. But I still get that 7.8 volts even when the external voltage source is turned off. So, it appears that the NI is still giving me internal excitation. Why? I have the 4 terminal connection pushed in as far as it goes. Is there some kind of hardware check to see we actually have external voltage? Is there some software switch I need to set besides telling it to use external source? What are my next steps for troubleshooting Thanks CR

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How to use external excitation with the 9237

Re: How to use external excitation with the 9237

motormannie

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‎08-30-2011 12:05 PM

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Great! Thanks

May i suggest that NI provide this information on the 9237 information page? (as they do with suggested cables etc) If i had known this connector was needed additionaly to the unit to excite to 10V, i would have purchased it at the same time.