Campbell CR300 Series Product Manual page 92

pulse count and period-average measurements are used to measure frequency-output sensors.
For more information, see
The data logger includes terminals that are configurable for pulse input as shown in the
following image.
Table 14-2: Pulse input terminals and the input types they can measure
Input Type
High-frequency
Low-level AC
Switch-closure
PulseCount()
Using the
pulse input to measure counts or frequency. Maximum input frequency is dependent on input
voltage. If pulse input voltages exceed the maximum voltage, third-party external-signal
conditioners should be employed. Do not measure voltages greater than 20 V.
Period-averaging measurements
Pulse Input Terminal
instruction, P_LL, P_SW, SE 1-4, and C terminals are configurable for
(p. 78).
C (all)
SE 1-4
P_SW
P_LL
P_LL
C (all)
P_SW
14. Measurements 79