DataV versus DataRaw question

[Kilroy]

Some other issue is the calibration of the output. The signal source is a sine wave with 10 Vpp taken from a Signal Generator and monitored by an Oscilloscope.
But as you can see in the attached screenshot the voltage only goes from -7.66 V to 7.34 V.
So there must be done some calibration, but its not just adding a DC offset. There must be a kind of scaling calibration to map the 7.34 to 10 V. The calibration factors from the eeprom seem not the right place to find a solution for that.
Do you also notice such a behaviour?
Regards Uwe

[Kilroy]

I have started to create a function library compatible to librp.so using the library header rp.h.
Some minor functions are working already.
And I also have some additional functions added to get access to all raw values.
Will let you know when the OSC part is working.
Regards Uwe

[Karri Kaksonen]

In my application using rp_AcqGetDataV works fine. When I switch to rp_AcqGetDataRaw I get only random low-amplitude noise.

If I understand correctly these functions should do about the same thing. Any ideas? Or fixes?

Code: Select all

#ifdef USE_FLOATS
        if (rp_AcqGetDataV(RP_CH_1, triggerPos, &outputBufferSize, fbuff) != RP_OK) {
            fprintf(stderr, "Error in acquisition\n");
        }
#else
        if (rp_AcqGetDataRaw(RP_CH_1, triggerPos, &outputBufferSize, tbuff) != RP_OK) {
            fprintf(stderr, "Error in acquisition\n");
        }
#endif