I’m using the PCSU1000 coupled with the PCGU1000 connected to my PC with Windows 7. They work fine but when i use a 10Hz square wave from the generator, the scope show an evident distorsion, lower the frequency bigger the distorsion (tilt).
I seen the output of the generator with an externa scope an it is ok.
What can be the problem ?
With sine wave and triangular wave the PCSU1000 shows no ddistorsion.
This is normal behavior of an oscilloscope when AC coupling is used.
When using the AC coupling, the signals are coupled capacitively.
Any DC signal component is blocked.
Low frequencies are attenuated (about 3 dB down at about 3 Hz).
AC coupling causes tilting of square waves at low frequencies.
