Campbell CR1000X - 10.5.1 Voltage Measurements

Sine wave (mV RMS) Range (Hz)
20 1.0 to 20
200 0.5 to 200
2000 0.3 to 10,000
5000 0.3 to 20,000
10.6.4 Quadrature input
Terminals: C1-C8 can be configured as digital pairs to monitor the two sensing channels of an
encoder.
Maximum Frequency: 2.5 kHz
Resolution: 31.25 µs or 32 kHz
10.7 Digital input/output specifications
Terminals configurable for digital input and output (I/O) including status high/low, pulse width
modulation, external interrupt, edge timing, switch closure pulse counting, high-frequency pulse
counting, UART, RS-232, RS-485, SDM, SDI-12, I2C, and SPI function. Terminals are configurable
in pairs for 5 V or 3.3 V logic for some functions.
Conflicts can occur when a control port pair is used for different instructions
(TimerInput(), PulseCount(), SDI12Recorder(), WaitDigTrig()). For example,
if C1 is used for SDI12Recorder(), C2 cannot be used for TimerInput(), PulseCount
(), or WaitDigTrig().
Terminals:C1-C8
Maximum Input Voltage: ±20 V
Logic Levels and Drive Current:
Terminal Pair Configuration 5 V Source 3.3 V Source
Logic low ≤ 1.5 V ≤ 0.8 V
Logic high ≥ 3.5 V ≥ 2.5 V
10.7.1 Switch closure input
Pull-Up Resistance: 100 kΩ to 5 V
Event: Low (<0.8V) to High (>2.5 V)
Maximum Input Frequency: 150 Hz
10. Specifications 171