High speed data acquisition appears to be averaging chucks of data

[davidepp]

I have 9237 modules running in a 9174 chassis, and the collection rate in Labview has been reduced due to the fact that I also have a 6218 USB DAQ running in the program, and the data needs to be collected at the same rate in order to compare the data. The internal clocks on the 2 systems are not synced; the program is using a time stamp. The problem I am having is that the data being collected from the 9237's seems to be average over chunks of time, giving to data a staircase look when it definitely should not be. Any suggestions as to how I might be able to remedy this?

[josborne]

I think a quick snapshot of the code is probably necessary to answer this question.  A "staircase" pattern in an analog signal can be due to a number of different things, including the natural effect of a ADC.

[johnsold]

Perhaps it is simply reading the same (old) value multiple times rather than averaging. This would also produce a staircase effect.

Lynn