CR1000 Manual - Campbell Scientific

Section 8. Operation
measurements (B) to be determined during CR1000 self-calibration (maximum of
54 values). These values can be viewed in the Status table, with entries identified
as listed in table Status Table Calibration Entries (p. 291).
Automatic self-calibration can be overridden with the Calibrate() instruction,
which forces a calibration for each execution, and does not employ any low-pass
filtering on the newly determined G and B values. There are two parameters
associated with the Calibrate() instruction: CalRange and Dest. CalRange
determines whether to calibrate only the necessary input ranges for a given
CRBasic program (CalRange = 0) or to calibrate all input ranges (CalRange ≠ 0).
The Dest parameter should be of sufficient dimension for all the returned G and B
values, which is a minimum of two for the automatic self-calibration of VoltSE()
including B (offset) for the ±2500 mV input range with first 250 µs integration,
and a maximum of 54 for all possible integration durations and input-voltage
ranges chosen.
An example use of the Calibrate() instruction programmed to calibrate all input
ranges is given as:
'Calibrate(Dest,Range)
Calibrate(cal(1),true)
where Dest is an array of 54 variables, and Range ≠ 0 to calibrate all input ranges.
Results of this command are listed in the table Calibrate() Instruction Results (p.
293).
Table 59. Status Table Calibration Entries
Status Table
Element
Differential (Diff)
Single-Ended (SE)
Descriptions of Status Table Elements
Offset or Gain
±mV Input
Range
Integration
CalGain(1) Gain 5000 250 ms
CalGain(2) Gain 2500 250 ms
CalGain(3) Gain 250 250 ms
CalGain(4) Gain 25 250 ms
CalGain(5) Gain 7.5 250 ms
CalGain(6) Gain 2.5 250 ms
CalGain(7) Gain 5000 60-Hz Rejection
CalGain(8) Gain 2500 60-Hz Rejection
CalGain(9) Gain 250 60-Hz Rejection
CalGain(10) Gain 25 60-Hz Rejection
CalGain(11) Gain 7.5 60-Hz Rejection
CalGain(12) Gain 2.5 60-Hz Rejection
CalGain(13) Gain 5000 50-Hz Rejection
CalGain(14) Gain 2500 50-Hz Rejection
CalGain(15) Gain 250 50-Hz Rejection
CalGain(16) Gain 25 50-Hz Rejection
CalGain(17) Gain 7.5 50-Hz Rejection
291