Figure 3-7.
Electronic counter ratio measurement, block diagram
f. If you use a preset counter, or a counter with a preset plug-in unit, you
may make frequency measurements by proper selections of the gate time. A plug-in
unit may be set to a gate time of 600 milliseconds. This setting causes an input
from a 100-pulse-per revolution tachometer to be displayed directly in revolutions
per minute.
g. Time interval measurements are similar to period measurements.
The only
exception is that the trigger points on the single waveform or waveforms are
adjustable, and when the com-sep switch is placed in COM position, measurements may
be made from one point on a waveform to another point on the same waveform (fig 3-
8).
Triggering polarity, slope, and amplitude are selected for each channel
separately.
The time interval is displayed in microseconds, milliseconds, or
seconds.
Figure 3-8.
Electronic counter time interval measurement, block diagram
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