05-07-2021 11:17 AM
I'm geting a sort of a choppy signal from USB6002. After unsucsessfully trying solving ground problems, I connected just a capacitor with a discharging resistor directrly to the input- the same thing- you can see the "stairs". I also used elementary data readout, without the buffer, still the same thing (the time unit is 100 ms, 200 s total in x axis) Anyone may help?
with nidaqmx.Task() as task:
for i in range(2000):
import pylab as plt
05-08-2021 10:23 AM
Some additional details would be helpful,
05-14-2021 12:56 PM - edited 05-14-2021 01:30 PM
I'm using USB6002 as AI, both RSE or DIFF mode have the same behavior
The signal is generated by the pressure sensor, I replaced it however with the test circuit consisting of capacitor discharged through a resistor (see the circuit below)- I have the same steps.
The USB device is connected to the laptop working on battery- there are no other devices connected there. I dont see any options to configure USB 6002 through NI Daq software.
I used the input now in the DIFF mode- I have the same steps still...
The capacitor was charged by an external power supply, which was then disconected and taken away, as seen on the first plot. The steps ~5 mV are clearly seen on the second plot, which shows the same signal (zoomed view).
05-14-2021 01:06 PM - edited 05-14-2021 01:23 PM
Fig.1. Discharge of a 2200 uF capacitor
Fig. 2 Magnification of recorded signal, see the right scale [V]
Fig 3. Test diagram
Fig 4. Test circuit