I get a nice flat line when there are no inputs (i.e. the BNCs are removed), lathough there may be slight glitches of transcient signals appearing (these dissapear when the i/p is shorted to ground). but when I introduce any varying signal I get a rough square wave. A rough square wave for sine and ...

I have a ADC100 unit that I have been using on an old Win98 laptop. Although the 'meter' and osciloscope work well the spectrum ananlsyer is very slow on this machine. So I have decided to dedicate an old XP desk top machine spacificaly for this device. The XP machine installed the software all ok a...