IEPE Accelerometer Connectivity check on NI 9234

[kampan]

I am using a 4 channel NI 9234 Analog IEPE module with a cDAQ NI 9184 chassis. I have an IEPE accelerometer and an IEPE Microphone on the first two channels of the NI 9234 module. I am using this setup for a test DC motor test system. I would like to check if the accel and the mic are connected before every test programmatically. Is there any NIDAQmx function to acheive this? Can I check if an IEPE sensor is connected to an Analog channel before starting the data acquisition task??

[Henrik_Volkers]

the common solution is to read the bieas voltage in DC mode, but that doesn't seems to be possiblewith this unit ??

Ways around:

The best way: If the sensors support TEDS , use it !  You can even identify the sensor 🙂

If TEDS doesn't work: (and open sensor and short detection is not supported)you can try this:

turn off IEPE current

switch to dc for some ms.  (Discharges the AC coupling cap)

switch back to AC and turn on IEPE current and immediatly start reading values. If a IEPE sensor is connected you should see a ~10V peak drifting to zero.

[kampan]

Yes, a NI application engineer confirmed that reading the biased voltage is not supported on this module. I will try TEDS first. Thanks for the reply!!