Part Number: INA3221
Hello,
Regarding the sequencing of conversions on large averaging settings during single-shot operation that measures both the shunt and bus voltages on a single channel. Are the samples for each signal:
A: taken all together and then it moves to the other signal, or
B: are they taken in an alternating fashion.
For example, if we set: 8.2 mS conversion time for Bus, 8.2 mS conversion time for Shunt, 1024 averages, Shunt and bus, single-shot (triggered)
Does it then:
A:
Take all the 1024 x 8.2 mS conversions for the Bus Voltage one after the other, effectively measuring exclusively Bus Voltage during 1024 x 8.2 mS = 8.4 Seconds.
and then,
Take all the 1024 x 8.2 mS conversions for the SHUNT Voltage one after the other, effectively measuring exclusively SHUNT Voltage during 1024 x 8.2 mS = 8.4 Seconds.
meaning that the resulting BUS voltage is 8.4 seconds old by the time the SHUNT voltage is finished.
or, B:
Take alternating conversions, meaning it takes: a 8.2ms conversion of the BUS, then take a 8.2ms conversion of the SHUNT, then BUS, then SHUNT, then BUS, then SHUNT, etc. Until it has 1024 samples of each, after 1024 x 8.2 mS x 2 = 16.8 seconds?
meaning that if there were some impulse events on the SHUNT while the BUS was being measured they are not represented in the final sample.
We are having some large inaccuracies in the current measurement of a PWM operated load, and we think that there might be some synchronization issues which are happening related with the way we set up the INA3221 related to this.
Thank you for your help!
