Data Translation DT9812 Series, User Manual, Page: 40 / 124

Chapter 3
40
Figure 13: Connecting Counter/Timer Signals for an Event Counting Operation
Without Using a Gate
Frequency Measurement
One way to measure frequency is to connect a pulse of a known duration to the Counter 0
Gate signal, as shown in
Figure 14 . In this case, the frequency of the Counter 0 In signal is the
number of counts divided by the period of the signal connected to the Counter 0 Gate input.
Figure 14: Connecting Counter/Timer Signals for a Frequency Measurement Operation
Using an External Pulse
Signal
Source
Counter 0 In
Ground
18
19
DT9812, DT9813, or
DT9814 Series Module
Counter 0 In
(Number of pulses counted
during gate period)
Counter 0 Gate
(Determines period
for count)
Signal
Source
Ground
18
19
16
Known Signal
Source
DT9812, DT9813, or
DT9814 Series Module