A signal switching unit has been devised to simplify the aassent and increase the accuracy of the settings of multiple trace oscilloscopes which are used in single-shot tests, such as shock wave experiments with VISAR instrumentation. The unit generates oscilloscope trigger and reset signals, and repetitively switches between signal lines and time-marks for a stable oscilloscope display which greatly facilitates the oscilloscope alignment prior to the test. Although the switching unit was designed specifically for the VISAR instrumentation, a similar unit could be used in many other instrumentation adjustment problems.
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