Pulse Measurements - Campbell CR300 Series Product Manual

18.5 Pulse measurements

The output signal generated by a pulse sensor is a series of voltage waves. The sensor couples its
output signal to the measured phenomenon by modulating wave frequency. The data logger
detects the state transition as each wave varies between voltage extremes (high-to-low or low-
to-high). Measurements are processed and presented as counts, frequency, or timing data. Both
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 18-2: Pulse input terminals and the input types they can measure
Input type
High-frequency
Low-level AC
Switch-closure
Period-averaging measurements (p. 101).
Pulse input terminal
C (all)
SE 1-4
P_SW
P_LL
P_LL
C (all)
P_SW
18. Measurements 102