NI 5734 Hardware Problem

[hazardous]

Hi,

I am using FlexRIO with a NI 5734 Digitizer on a NI 7862R FPGA.

Since some days the input of all 4 ADC's shows an uncommon behaviour.

If I connect a square wave signal to any of the inputs, the signal is distorted like in the attached picture.

I checked the signal also with another oscilloscope, cables and waveform generator. It seems to be a hardware problem...

Has anybody an idea?

Yours,

Chris

[hazardous]

Found the solution!!

It was the AC coupling... you can configure it with user commands. 

See the example: NI5734 - Clock Select (FPGA)

[PhilGib]

Following on from this problem, I believe I have a similar problem with the gain setting of the NI 5734 module.

The documentation I have found states that it is software configurable but I cannot find anywhere that tells you how to configure it.

Any guidance would be hugely appreciated.

Regards,

Phil.

[hazardous]

Hi Phil,

I think this should help:

https://decibel.ni.com/content/docs/DOC-15799/version/4

I recommend you to use the NI FelxRIO Instrument Development Library.

Best Regards

[alireza_007]

regarding ni5734 , I have a problem when I connect a voltage source  to ni5734 and an oscilloscope simultaneously. In this case the voltage reading on oscope drops ( almost by 50%). It seems that it is due to high impedance in oscilloscope and low (50ohms)  in NI5734.  Does anybody know what should I do about this?