Pulse Measurement Specifications; Switch-Closure Input; High-Frequency Input; Low-Level Ac Input - Campbell CR300 Series Product Manual

19.6 Pulse measurement specifications

Terminals are individually configurable for switch closure, high-frequency pulse, or low-level AC
measurements.

19.6.1 Switch-closure input

Terminals:
P_SW
l
C1-C2 (Requires an external 100 kΩ resistor connected from the terminal to VX1 or VX2.)
l
Maximum Input Frequency: 150 Hz
Minimum Switch Closed Time: 3 ms
Minimum Switch Open Time: 3 ms
Maximum Bounce Time: 1 ms open without being counted

19.6.2 High-frequency input

Terminals:
SE1-SE4
l
P_LL
l
P_SW
l
C1-C2
l
Maximum Input Frequency:
SE1-SE4: 35 kHz
l
P_LL: 20 kHz
l
P_SW: 35 kHz
l
C1-C2: 3 kHz
l

19.6.3 Low-level AC input

Terminal: P_LL
Maximum Input Voltage: ±20 VDC
DC-offset Rejection: Internal AC coupling eliminates DC-offset voltages up to ±0.05 VDC
Input Hysteresis: 12 mV at 1 Hz
19. CR300 series Specifications 191