Scanimage 2018b introduces a new oscilloscope mode to visualize raw data acquired with a high speed digitizer (NI57xx). This data scope can be used to identify noise, digitizer saturation and signal bandwidth issues.
This feature is currently only available for use with FlexRIO digitizers (NI57xx). It is not available when X-series DAQ boards (63xx) are used to acquire PMTs.
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Data Scope showing typical PMT power supply ripple noise at 320kHz in power spectrum.
Different noise sources can be identified in different steps in the acquisition pipeline. To identifiy noise sources, start the datascope and set Pmt Power, Laser, and the Imaging status as described in the table below.
The Data Scope automatically chooses an appropriate sampling frequency depending on the time scaling in the Time Plot. Use the mouse wheel to zoom into the time axis of the Time Plot.
To see low frequencies in the power spectrum, a longer time window needs to be chosen (i.e. use a time window >1s to see 50/60Hz noise).
Power line noise / Ground loop
Drifting horizontal bars in image
Connect all equipment to same power outlet (Observe maximum allowed current on outlet).