HI all, I am using PCI-6040-E DAQ. I have a UUT whose pins are connected to the appropriate channels of the DAQ.Actually,I have the circ

[Chaitanya]

uit board which needs to be tested mounted on a test fixture. The pins of the curcuit board need to be given certain voltages from LabVIEW to verify some tests.But,my signals dont go to those input pins of UUT eventhough my program doesn't have any errors.HI all, I am using PCI-6040-E DAQ. I have a UUT whose pins are connected to the appropriate channels of the DAQ.Actually,I have the circuit board which needs to be tested mounted on a test fixture. The pins of the curcuit board need to be given certain voltages from LabVIEW to verify some tests.But,my signals dont go to those input pins of UUT eventhough my program doesn't have any err
ors.I tested whether my program has any errors. I did this by connecting a cable from analog ouput channel 0 of DAQ to Analog input channel 0.(basically i am sending a signal from output channel to input channel within the DAQ)I ran the program and checked the output on analog input channel 0 on a scope. I didnt get any errors and the scopes showed the signal i am sending. That means, the program is sending the signals to channel 0 atleast, leave alone the receiving part.A pin of the cicuit board is connected to ch 0.when i run the same program and check the voltage at that pin, i cannot see any voltage.The signal isn't going at all....i canot figure whats happenin......plese help

[mikeporter]

uit board which needs to be tested mounted on a test fixture. The pins of the curcuit board need to be given certain voltages from LabVIEW to verify some tests.But,my signals dont go to those input pins of UUT eventhough my program doesn't have any errors.Sounds like you have a wiring problem in the fixture. Grab an ohmmeter and start tracing-out the runs from the connector to the probes in the bed-of-nails fixture.

Mike...

[Nirmal_Sharma]

uit board which needs to be tested mounted on a test fixture. The pins of the curcuit board need to be given certain voltages from LabVIEW to verify some tests.But,my signals dont go to those input pins of UUT eventhough my program doesn't have any errors.Hi,

As you described that when you dont connect anything on DAC0 channel of PCI-6040, you are getting the right voltage. But when you connect to your test fixture, no voltage appears there. I feel, test your signal output step by step, i mean that just try feeding DAC0 output to some other test fixture or uut, observe the issues. Or instead of feeding the DAC0 output directly to test fixture, feed it in one of the module if your test fixture is modular & can be separated into various parts or stages. I think you need to debug your test fixture on each stage of your votlage path.

Hope this works. Your feedbacks are welcome.

Best Regards,
Nirmal Sharma
India