Test capacitor does not load when DAQ USB-6221 is used as a measuring device

Forum of NOR expensive, I have a Setup (see below) which is supposed to read the tension between a capacitor and a resistor in series.  Unfortunately, I found that the capacitor is unable to load completely with the connected acquisition of data entry.  However, if I remove AI0 connection of the circuit and the capacitor charges normally...

I would be grateful if someone could explain to me:

  • Why this happens
  • If there is a way to change my test circuit in order to fully load the DAQ capacitor is connected

For reference, I tried to change the position of resistance and capacitor (i.e. initially the capacitor in series), and in this case, the capacitor had no problem charging.  But for my purposes, I will need to test with first series resistance because I already have a lot of maps of test which are built this way.

The food is set up to provide 75V (the rated voltage of the capacitor) when put on and the current limit is set at 20 Ma.  With these settings my capacitor only charge about 20 or 30 V with DAQ in the circuit.

Let me know if I can give more details and thanks in advance to those who give thought to my question,

You may test the limits of your USB-6221 surge.  I hope that you don't him don't have not damaged.

You should be able to use some simple resistive voltage dividers for tensions in the acceptable range.  They will limit your ability to measure the leakage current.

Lynn

Tags: NI Hardware

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