Campbell CR300 series - Voltage Excitation - Specifications; Current Measurements - Specifications; Pulse Measurements - Specifications; Switch-Closure Input

CR300-Series Datalogger
45
Ratiometric Accuracy
1,2,3
0 to 40 °C: ±(0.05% of voltage measurement + offset)
–40 to 70 °C: ±(0.06% of voltage measurement+ offset)
1
Assumes input reversal for differential measurements.
2
Does not include bridge resistor errors and sensor measurement noise.
3
Ratiometric accuracy, rather than absolute accuracy, determines overall measurement
accuracy of ratiometric resistance measurements.
7.3 Voltage Excitation – Specifications
Two terminals configured for voltage excitation using 12-bit D-to-A converter.
When used for ratiometric-resistance measurement, excitation is active only
during measurement.
Terminals: VX1-VX2
Range: 150 to 5000 mV
Resolution: 4.5 mV
Maximum Source
or Sink Current: 50 mA total, concurrently or independently
7.4 Current Measurements – Specifications
Two independent analog inputs may be configured as independent, non-
isolated 0-20 mA or 4-to-20 mA current-loop inputs. One channel at a time is
measured in numeric succession. Current is measured using a 24-bit A-to-D
converter.
Terminals: SE terminals 1-2
Range: 0 to 25 mA
Accuracy
0 to 40 °C: ±0.14% of reading
–40 to 70 °C: ±0.26% of reading
7.5 Pulse Measurements – Specifications
7.5.1 Switch-Closure Input
Terminals: P_SW
C1-C2
1
Minimum Switch-Closed Time: 3 ms
Minimum Switch-Open Time: 3 ms
Maximum Bounce Time: 1 ms open without being counted
Maximum Input Frequency: 150 Hz
Maximum Input Voltage: ±17 Vdc
1
Requires an external 100 kΩ resistor connected from the terminal to BAT+.