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For example, if the input is exactly 0.0000 and readout shows –0.0011,
0_ADJ should be adjusted by adding 0.0011 to it.
2.
Connect a 100Ω resistor (10 ppm accuracy) to the input and measure its
resistance. Note the average error in the measurement. Adjust the
100_ADJ parameter by subtracting the measured error. For example, if
the input is exactly 100.0000Ω and the readout shows 100.0295Ω,
100_ADJ should be adjusted by subtracting 0.0295 from it.
3.
Connect a 400Ω resistor (10 ppm accuracy) to the input and measure its
resistance. Note the average error in the measurement. Adjust the
400_ADJ parameter by subtracting the measured error. For example, if
the input is exactly 400.0000Ω and the readout shows 399.9913Ω,
400_ADJ should be adjusted by adding 0.0087 to it.
4.
Record the date with the calibration date parameter.
5.
Verify the accuracy at 0Ω, 25Ω or 50Ω, 100Ω, 200Ω, and 400Ω on se-
lected channels. Verify at least one resistance on each channel. The accuracy
must be within the short-term accuracy given in the specifications.
6.
Set the wiring configuration of both rows to three-wire (see Section
9.3.1). Verify the accuracy with at least one resistance on each channel.
The accuracy must be within the short-term accuracy plus the additional
three-wire uncertainty as given in the specifications.
9.4.4
Calibration Procedure (2568)
The calibration procedure for the 2568 Module is the same as the 2562 except
the parameters 0_ADJ, 1K_ADJ, and 4K_ADJ are used to calibrate the mea-
surement at 0Ω, 1KΩ, and 4KΩ respectively.
9 2562/2568 PRT Scanner Module
Calibration
131
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