Python programming, How to activate IEPE power for data acquisition with NI 9231 and PCB 352C34(ICP) acceleration sensor

[Lou_daq]

Hi guys,

Please provide the best solution making the task with IEPE enabling for acceleration sensor, now I am using below code and it doesn't enabling the power.

add_ai_accel_chan(accel, terminal_config=<TerminalConfiguration.DEFAULT: -1>, min_val=-5.0, max_val=5.0, units=<AccelUnits.G: 10186>, sensitivity=100.0, sensitivity_units=<AccelSensitivityUnits.M_VOLTS_PER_G: 12509>, current_excit_source=<ExcitationSource.INTERNAL: 10200>, current_excit_val=0.002)

Do you have idea why the ICP or IEPE is not enabling?

Thank you so much.

[santo_13]

Please share the entire code. you're creating the channel correctly.

Is the sensor TEDS compatible? if so it makes your life easier in terms of configuring the sensitivity.

[Lou_daq]

Sensor manual itself is TEDS capable, but I tried to register this sensor to DAQ, it doesn't recognized. Please kindly see the task program to read accel as below.

task1 = nidaqmx.Task("VIB")
task1.ai_channels.add_ai_accel_chan(
accel,
sensitivity=100,
current_excit_source=ExcitationSource.INTERNAL,
current_excit_val=0.002,
units=units_g)

task1.timing.cfg_samp_clk_timing(pm.vib_Srate,
samps_per_chan=pm.vib_spc)

vib_arr = np.ndarray((pm.vib_num_ch, pm.vib_spc))
vib_arr.fill(0)

reader1 = AnalogMultiChannelReader(task1.in_stream)
reader1.read_many_sample(vib_arr)

Please let me know is there any attaching helps to enable the IEPE.

Thank you so much.

[santo_13]

I am not familiar with Python code but trying to relate it with LabVIEW to understand it.

As a quick check to see if the problem is in your code, please try using the DSA soft front panel to quickly start capturing the signal.

https://www.ni.com/en-us/support/downloads/drivers/download.dsa-soft-front-panels.html#376770

You can use the help button in the software to learn how to use this soft panel

[Lou_daq]

Hi, here is the captured the screens of the option and measuring panel, and please kindly review the recording file attached in this message.

Thank you.

[Lou_daq]

Here is the recording file. 

Thank you.

[santo_13 · Accepted solution]

I could not infer anything from the recording.

Question - since these are acceleration sensors if you pick them up and shake, do you see those variations show up on the DSA soft panel - if yes, then the sensor is working

[Lou_daq]

The library doesn't explain the IEPE function enables automatically when you put the internal excitation current with add_accel. I figured out with DSA panel thank you so much. DSA soft panel is really great to trouble shoot for comparing signals with my software, good tip!