I'm using the 4824 with a custom C# application.
I have the following issue which I was not able to resolve yet:
When starting an AC coupled measurement in Block mode, the first thousand samples are wrong.
Input Signal: 600mV DC off a Lecroy waveStation2012
Picoscope channel configuration: Channel A, Range 1V, Coupling AC
Sample count: 1300, Timebase: 8100
Collect sample in blockMode
wait for ps4000aBlockReady
Expected result: 1300 samples around 0mV.
Measured result: Declining values from Sample(1): 300mV to Sample(1300): 79mV. If i collect a second block of data the values are correct.
There is no problem when setting the channel to DC coupling.
Waiting >10s between channel setup and measuring does not help.
The input voltage is correct (Measured with a benchtop scope).
Which leads me to the question: Ist there something I have to do before I can start measuring AC only? Am I missing something obvious?
Last edited by LouisRast
on Mon Oct 19, 2015 8:53 am, edited 1 time in total.