ADLINK PXIe-9852 - Manual (Page 34)

24 Operations
Figure 3-9: Re-Trigger Mode Acquisition
3.4.6 Data Average Mode (Post-Trigger and Delayed-
Trigger only)
In normal post-trigger mode acquisition, N samples/channel data
are generated for a single trigger event. In Re-trigger mode (See
“Acquisition with Re-Triggering” on page 23.), a total of N * R sam-
ples/channel data is generated for R trigger events, that is, R
traces (A trace contains N samples/channel). In Data Average
Mode, only N samples/channel data are generated for R trigger
events. The single trace data (N samples/channel) is the average
of the R traces sample by sample.
The output data format is 16-bit or 32-bit signed integer, software
selectable. When higher measurement accuracy is desired, data
average mode with 32 bit data output can improve the resolution.
According to oversampling practice, the retrigger times R required
to get n bits of additional resolution is R = 4^n. Please note that in
order for data average mode to work properly, components of sig-
nal of interest, such as period and magnitude, should be consis-
tent during conversion.