Campbell CR300 series - 12. Cellular communications option

CR300-Series Datalogger
43
Input Limits: –100 to 2500 mV
Maximum Input Voltage
SE 1-2: –6 V, +9 V
SE 3-6: ±17 V
DC Common-Mode Rejection: >120 dB with input reversal
≥90 dB without input reversal
Normal-Mode Rejection: >71 dB at 60 Hz
>74 dB at 60 Hz
Input Current: See TABLE 7-4, Analog Voltage
Measurement Input Resistance and
Current
(p. 44)
1
Accuracy specification does not include sensor error or measurement noise.
2
Assumes input reversal for differential measurements.
3
See TABLE 7-2, Analog Voltage Measurement Accuracy Offsets
TABLE 7-1. Analog Voltage Measurement Range and Resolution
f
N1
1
(Hz)
Range
2
(mV)
Typical Effective Resolution
3
Differential
Measurements
with Input
Reversal
Differential
Measurements
without Input
Reversal
RMS (µV) bits RMS (µV) bits
4000
–100 to +2500 23 16.8 33 16.3
–34 to +34 3.0 14.5 4.2 14.0
400
–100 to +2500 3.8 19.4 5.4 18.9
–34 to +34 0.58 16.8 0.82 16.3
50/60
–100 to +2500 1.6 20.6 2.3 20.1
–34 to +34 0.23 18.2 0.33 17.7
1
First notch frequency
2
Range overhead of ≈10% on all ranges guarantees that full-scale values will not
cause overrange.
3
Effective resolution (ER) in bits is computed from the ratio of full-scale range to
RMS noise, where RMS noise is the standard deviation of many measurements of
grounded inputs.