Redpitaya Forum

Hello,

I am a research student aiming to utilise the PID capability of the Red Pitaya. However, the fast analog input and output ports do not appear to be working:

1. Fast Analog Input 1 reads a constant maximum voltage (-1.058V on LV and -23.4V on HV). This value does not change regardless of what signal, if any, I connect to this port.

2. Fast Analog Input 2 works fine

3. Fast Analog Output 1 outputs a constant voltage of approximately -2.9V. This value does not change regardless of what signal, if any, I generate on either the web app or the console.

4. Fast Analog Output 2 has the same behaviour as Fast Analog Output 1.

I reset the calibration of the fast analog input and outputs to the factory default but it did not resolve the problem. Any advice on how to fix?

Thanks.

-2.9V is well outside the range that can be programmed for the fast analog outputs, so my guess would be a hardware defect.

redpitaya wrote:If you suspect that your RP is broken please
write us on support.
http://redpitaya.com/services/

Thanks! I have only connected the fast analog outputs to an oscilloscope, a frequency mixer and a 741 op-amp so I am unsure as to how the problem arose. Also, I have never used output 2 before so I am again confused as to why it is broken.