Analog discovery 1 - Analog input

[samuel]

Hello,

I'm using Analog Discovery creating arbitrary waveforms and measuring the analog channel with the data acquisition toolbox in matlab. Generating the waveform works really good, but while starting the measurement I get an offset. The attached picture shows the measurement for an open input. Does some else have these problems? In the waveform generator there will be also an offset, but it is smaller. Is there maybe an hardware defect?

Thanks,
Samuel

[attila]

Hi @samuel

What you are seeing is the offset settling on device open or on offset (or range/gain) change.

 

[samuel]

Hi @attila

thank you for the answer. What I'm wondering is the high settling time. In your plot it's about 10ms, in my plot more than 300ms and also the voltage is different. Is this depending  on the time and voltage range?

[attila]

Hi @samuel

Yes, it depends.

At 500mV/div or lower the scope input is in high gain, having +/-2.5V offset setting, so 5V excursion is the maximum.
At low gain the timing is similar just the range and offset voltages are 10 times higher, 50pk2pk.