Input stage overshoot
Posted: Wed Apr 08, 2020 3:26 pm
Hi,
When I connect the analog output of Red Pitaya STEMLAB 125-14 to the analog input of the same device (loopback), using a BNC cable (no probe), I get the following ( HV, 2KHz, 2 Volts peak to peak) :see 2nd picture
In // I connect the output of Red Pitaya (STEM 125-14) to my oscilloscope (Hantek 4102C) with the following result : see 1st picture
It seems obvious the the input stage of Red Pitaya is overshooting. I went through the forum and found a previous thread named "Input Stage Inerfections" but I didn't see a clear and usable fix for this problem.
I do not use any probe, only straight 50 ohms cables with BNC connections. I try to load the output with a 50 ohms load without any change (obvious).
The unit is a new one delivered in 2019. It replaces a previous unit that didn't show the same issue (as far as I remenber).
Please help
cgo75
When I connect the analog output of Red Pitaya STEMLAB 125-14 to the analog input of the same device (loopback), using a BNC cable (no probe), I get the following ( HV, 2KHz, 2 Volts peak to peak) :see 2nd picture
In // I connect the output of Red Pitaya (STEM 125-14) to my oscilloscope (Hantek 4102C) with the following result : see 1st picture
It seems obvious the the input stage of Red Pitaya is overshooting. I went through the forum and found a previous thread named "Input Stage Inerfections" but I didn't see a clear and usable fix for this problem.
I do not use any probe, only straight 50 ohms cables with BNC connections. I try to load the output with a 50 ohms load without any change (obvious).
The unit is a new one delivered in 2019. It replaces a previous unit that didn't show the same issue (as far as I remenber).
Please help
cgo75