Converting raw acquire results into a voltage
Posted: Mon Oct 13, 2014 6:04 pm
Hi All,
I'm using the 2 analog inputs in HV mode and capturing the results using the acquire application.
Am I correct in understanding that the voltage per bit of the ADC is calculated as follows:
HV mode - input is max +/- 20V == 40V
40V / 16384 = 2.44mV per bit
Therefore, an average voltage captured by acquire of 291 is:
291 x 2.44mV = 710mV
The problem I'm having is that the voltage I am measuring is actually 1.729V, not 710mV, so I must be making a calculation error or misunderstand the conversion the RP is making on my analog input.
Thanks in advance for any help, Stuart
I'm using the 2 analog inputs in HV mode and capturing the results using the acquire application.
Am I correct in understanding that the voltage per bit of the ADC is calculated as follows:
HV mode - input is max +/- 20V == 40V
40V / 16384 = 2.44mV per bit
Therefore, an average voltage captured by acquire of 291 is:
291 x 2.44mV = 710mV
The problem I'm having is that the voltage I am measuring is actually 1.729V, not 710mV, so I must be making a calculation error or misunderstand the conversion the RP is making on my analog input.
Thanks in advance for any help, Stuart