high freq with multiple channels

Hi there 

I have a problem here and would like to know whether you guys have seen such 
a thing. 

I have to convert 8 S/E analog channels to digital signals using an 
Advantech PCI 1710HG. It has a maximum sample rate of 100 kHz. With the 
comedi_command I get fine results below 32 kHz (4 kHz for each channel), 
however there is a distortion above it: the 1st chan's maximum and minimum 
level shrinks (eg. +-10V becomes +-6V) and the 2nd one 'hears' the 1st one. 

Have you ever heard about something like this? 

Gyula

Received on 2004-04-23Z10:46:49