clemauff

Thank you. This seems that to mean that the FDwfAnalogInChannelRangeSet function selects the range from the expected measured voltage given by parameter voltsRange.

Hi, I have an ADP 3450 and I'm trying to use the SDK with 100x probes on channel 3 and 4 to measure a voltage of about 600 V. When using the Waveform software, the measurement looks good, but when using the SDK, the voltage is clamped at about 108 V (exact value depends on the channel). It seems I'm applying correctly the attenuation factor, but the range is not set as it should. When applying an attenuation coefficient of 100 using the function FDwfAnalogInChannelAttenuationSet, the voltage range for the associated channel is changed automatically from 53.68... (or 54.63... depending on the channel, gathered using FDwfAnalogInChannelRangeGet) to 215.25... (or 219.02...). Those values are very different from the ones listed in the range list I can gather with FDwfAnalogInChannelRangeSteps (2. V and 50. V). It seems applying the attenuation changes the gain and its associated range from 50 V to 2 V (which is about 200 V considering the 100x factor). When applying a non-listed range value of 5000 V, the measured value is as expected. Would it be possible to have more explanations about what the function FDwfAnalogInChannelRangeSet does and which voltsRange values it can passed as parameters? Many thanks, Camille