The waveforms provided by spectrumdevice currently contain raw ADC samples in LSB. They should be converted to voltages as follows:
"The Spectrum driver also contains a register that holds the value of the decimal value of the full scale representation of the installed ADC. This value should be used when converting ADC values (in LSB) into real-world voltage values, because this register also automatically takes any specialities into account, such as slightly reduced ADC resolution with reserved codes for gain/offset compensation.
Register: SPC_MIINST_MAXADCVALUE
Value: 1126
Description: Contains the decimal code (in LSB) of the ADC full scale value
In case of a board that uses an 8 bit ADC that provides the full ADC code (with- out reserving any bits) the returned value would be 128. The the peak value for a ±1.0 V input range would be 1.0 V (or 1000 mv).
When converting samples that contain any additional data such as for example additional digital channels or overrange bits, this extra information must be first masked out and a proper sign-extension must be per- formed, before these values can be used as a signed two’s complement value for above formulas."
The waveforms provided by
spectrumdevicecurrently contain raw ADC samples in LSB. They should be converted to voltages as follows:"The Spectrum driver also contains a register that holds the value of the decimal value of the full scale representation of the installed ADC. This value should be used when converting ADC values (in LSB) into real-world voltage values, because this register also automatically takes any specialities into account, such as slightly reduced ADC resolution with reserved codes for gain/offset compensation.
Register: SPC_MIINST_MAXADCVALUE Value: 1126 Description: Contains the decimal code (in LSB) of the ADC full scale value
In case of a board that uses an 8 bit ADC that provides the full ADC code (with- out reserving any bits) the returned value would be 128. The the peak value for a ±1.0 V input range would be 1.0 V (or 1000 mv).
When converting samples that contain any additional data such as for example additional digital channels or overrange bits, this extra information must be first masked out and a proper sign-extension must be per- formed, before these values can be used as a signed two’s complement value for above formulas."