Ni PCI 6024E daq card analog input saturation

[AlphaBetaGamma]

I have a NI pci- 6024E daq card. im using labview 2020 and daqmx. 
im  trying to read an analog signal that im generating using a function generator. I have created a simple program to take analog input using DAQmx wizard. but the input signal is saturating...... it stays at 10v for the most part and sometimes flickers gives random values during measurement. 
im connecting the function generator positive terminal with AI0 and the function generator negative with AI Ground and im using RSE configuration and continous sampling (have tried other options like differential, NRSE and on demand etc etc but none works)

I have also used the test panel to verify the input and still it gives the same output there as well. 
i have also used a DC power supply and try to measure fix voltages and still it shows 10v.
what might be the possible cause for this? how can i fix this?

[AlphaBetaGamma]

i have tried to generate an analog output  using AO0 and then i have hard wired AO0 with AI1 and acquired the same signal using AI0. The generated waveform is accurately read by the board.  Although the amplitude has some error in it but still..... atleast its working somehow...

But, when i try to connect external DC voltage using DC power supply or using a function generator, The issue mentioned in the parent post still persists. 

[GerdW]

Hi ABG,

---

@AlphaBetaGamma wrote:

i have also used a DC power supply and try to measure fix voltages and still it shows 10v.
what might be the possible cause for this? how can i fix this?

---

Have you tried to use a small AA battery (1.5V), connected to AI0/AGND instead?

[ZYOng]

See Table 1 of Field Wiring and Noise Considerations for Analog Signals for the recommendation on the wiring.

[AlphaBetaGamma]

After reading the wiring guide, i came to know that my building doesnt have common ground and so i should connect my function generator considering its a floating device. This worked in RSE mode and i was able to read the signal. 

But there were 2 issues. 
1. The voltage level kept flickering to saturation again and again. almost after every 2 3 seconds and then again returned to the true signal.
2. there was noise in the signal.

Therefore i tried connecting using the NRSE mode or differential mode using the wiring information in table 1 of this link

https://www.ni.com/en/support/documentation/supplemental/06/field-wiring-and-noise-considerations-fo...

i used resistance of 15K ohm for NRSE and DIFF modes. but all i could get was random noise which had no effect of changing voltage or frequency or shape of signal using function generator. 

i have properly followed the wiring guide and also switched between analog channels. the connection between my function generator and DAQ card is using almost 2 feet wires. 

what do you think might be the issue with NRSE and DIFF config? why does my signal keep saturating in RSE mode? 

[AlphaBetaGamma]

i tried your solution. can you kindly refer to my reply on the main post?

[AlphaBetaGamma]

another thing i noticed was that in this link 
https://www.ni.com/en/support/documentation/supplemental/06/field-wiring-and-noise-considerations-fo...

the wiring diagrams were mentioned in table 1 as

Notice DIFF and NRSE config in floating devices, 

whereas in the manual for my device NI PCI 6024E the wiring diagrams were

which one should i follow? 
but, when i follow any of these wiring diagrams i cant read the signal in DIFF and NRSE mode while using 15K ohm resisters. i dont know the impedance of my function generator. 

[AlphaBetaGamma]

I have NI PCI 6024E daq card and im using labview 2010 with daqmx. Im generating a signal using a function generator and reading it using my daq card. My function generator is not connected to building ground and therefore im considering it as a floating device.  

Im able to accurately read the analog input signal in RSE mode with contionus samples mode. 

But when i try to read the signal using NRSE OR DIFF mode i get saturation at 10v with various spikes here and there. 

Im following the wiring guide at 

https://www.ni.com/en/support/documentation/supplemental/06/field-wiring-and-noise-considerations-fo...

And im using R of 15k ohm. I dont know the impedance of my function  generator.  

another thing i noticed was that in this link 

https://www.ni.com/en/support/documentation/supplemental/06/field-wiring-and-noise-considerations-fo...

the wiring diagrams were mentioned in table 1 as

 Notice DIFF and NRSE config in floating devices, 

whereas in the manual for my device NI PCI 6024E the wiring diagrams were

 

which one should i follow? 
but, when i follow any of these wiring diagrams i cant read the signal in DIFF and NRSE mode while using 15K ohm resisters.

What might be the issue? Im pretty sure im connecting the connections according to the diagrams correctly.