Campbell-scientific CR3000 Micrologger Manuel d'utilisateur Page 284

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Section 8. Operation
284
Table 53. CRBasic Parameters Varying Measurement Sequence and
Timing
CRBasic Parameter Description
MeasOfs
Correct ground offset on single-ended measurements.
RevDiff
Reverse high and low differential inputs.
SettlingTime
Sensor input settling time.
Integ
Duration of input signal integration.
RevEx
Reverse polarity of excitation voltage.
8.1.2.4 Measurement Accuracy
CR3000 analog-measurement error is calculated as
Error=GainError(%)+OffsetError
Gain error is expressed as ±% of reading and is a function of CR3000
temperature. Between 0°C and 40°C, gain error is ±0.04% of input voltage. This
gain error assumes factory recalibration every two years.
Offset error depends on measurement type and input range. For differential
measurements with input reversal,
OffsetError=1.5Resolution+1.0µV
where
BasicResolutionisthepublishedresolutionoftheprogrammedinput
voltagerange(seeCR3000Specifications
).
Figure CR3000 Voltage Measurement Accuracy
(p. 285) illustrates that as magnitude
of input voltage decreases, measurement error decreases.
Note The accuracy specification includes only the CR3000 contribution to
measurement error. It does not include the error of sensors.
For example, assume the following (see CR3000 Specifications ):
Input Voltage: 5000 mV
Programmed Input Voltage Range: ±5000 mV (mV5000)
Programmed Measurement Instruction: VoltDiff()
Input Measurement Reversal: True
CR3000 Temperature: Between 0°C and 40°C
Accuracy of the measurement is calculated as follows:
Error=GainError+OffsetError,
where
GainError=±(5000*0.0004)
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