Incorrect voltage to a channel with NI9205

Hello everyone

I measure 10 tension of cell with a NI 9205 (differential mode, volt min. = 1, maximum voltage = 3).

Everything works fine, until tensions are higher than 2.7 V. channel 17 (cell number 10), the voltage begins to decrease.

All the other channels (0-7 and 16) works correctly.

For example, when the real tension is 2.72, the measure shows 2.64 (and the value is not very stable). The more the voltage of the cell increases more 2.7 V, the more the measure of this cell voltage begins to decrease.

I also connected the voltage of channel 17 to channel 18, but the problem remains. Both channels show too low voltage (but not exactly the same value).

My sampling rate is 15, my conversion of clock frequency is 200.

In addition, I have two NI9217 in my cDAQ-9172 chassis to measure 8 temperatures.

Everything is measured in a task (10 voltages, temperatures of 2 x 4).

Any ideas how to fix?

Thanks and greetings

Socki

Socki,

with 10 cells in a row you are likely well beyond the sides of the 9205 input voltage. Please note that the 9205 offer channel for floor insulation, but not from track to track. The voltage for each channel must remain in +/-10.4 V of the common. With your stack of the cell you are probably larger than this limit and reduced tension that you see is the result of the entry of the 9205 amplifier starts to saturate.

As a solution, you will probably use a second analog input module and divide your channels in the middle of your stack of the cell.

Kind regards

Jochen Klier

National Instruments

Tags: NI Hardware

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