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Chapter 5
Connecting Frequency Measurement Signals
92
You can connect a frequency measurement application to a DT740 or
STP268 screw terminal panel in two ways.
The first configuration uses the same wiring as an event counting
application that does not use an external gate signal (see
page 85
for the DT740,
42 on page 90
for the STP268-EC). The software uses the Windows
timer to specify the duration of the frequency measurement. In this
configuration, the frequency of the clock input is the number of
counts divided by the duration of the Windows timer.
If you need more accuracy than the Windows timer provides, you can
connect a pulse of a known duration (such as a one-shot output of
another user counter) to the external gate input. In this configuration,
the frequency of the clock input is the number of counts divided by
the period of the external gate input. For an example of this
configuration, refer to
on page 94
for the STP268, or
Figure 39
on
page 87
Figure 44 on page 93
Figure 46 on page 94
Figure 36
for the STP268, or
Figure
for the DT740,
Figure 45
for the STP268-EC.
on
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