only possible to make a measurement on the first channel of the scan list

[sadelin]

NI-DMM/Switch Express


+ Goal of the labview programm : Automated Measurements and Switching

+ Description of the hardware configuration :
++++++PXI-4065 on slot #5 (DMM)
++++++PXI-2503 on slot #12 |(relay switych)

+ Configuration of the NI-DMM/Switch Express
+++++ switching configuration : 2-wire 24x1 multiplexer , PXI trigger synchronous , DMM measurement complete : PXI trigger 0 - scan list : PXIslot12/ch0->com0 and PXIslot12/ch1->com0
+++++ timing configuration : N sample : 10
+++++ Configuration : device : PXIslot4 (PXI-4065), Measurement function : DC volt , Specific range : 10

+ Description of the issue
++++++ 7.5 volts is connected to CH0, 8.5 volts is connected to CH1.
With NI-DMM/Switch Express the mesurement on com0 shows always 7.5 volts. The channel #1 is never switched to the com0. IT IS THE BUG --- HOW TO FIX IT ? What is missing in our configuration? software ?

Remark #1  via  NI MAX the swicth is working properly

[mikeporter]

Code?

Mike...

[CoastalMaineBird]

I suspect a bug in your program.

[sadelin]

hello,

You will find the code in attachment, very basic one !

1-DC signal on CH0 between CH0+ and CH0-

2- DC signal on CH1 between CH1+ and CH1-

3- Measurement on COM0 between COM0+ and COM0-

COM0 always see CH0 !

thanks for your help