CR300-Series Datalogger
45
Ratiometric Accuracy
1,2,3
0 to 40 °C:
±(0.05% of voltage measu offset)
–40 to 70 °C:
±(0.06% of voltage meas 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 k
Ω resistor connected from the terminal to
BAT+
.
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