1.
Connect a 0
Ω
resistor to the input and measure its resistance. If a short-
ing wire is used, the wire should run from the inside black terminal to
the inside red terminal to the outside red terminal then back across to the
outside black terminal. Note the average error in the measurement. Ad-
just the 0_ADJ parameter by subtracting the measured error. For exam-
ple, if the input is exactly 0.0000
Ω
and readout shows –0.0011
Ω
, 0_ADJ
should be adjusted by adding 0.0011 to it.
2.
Connect a 100
Ω
resistor (5 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 100.0000
Ω
and the readout shows 100.0295
Ω
,
100_ADJ
should be adjusted by subtracting 0.0295 from it.
3.
Connect a 400
Ω
resistor (5 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 400.0000
Ω
and the readout shows 399.9913
Ω
,
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 0
Ω
, 25
Ω
or 50
Ω
, 100
Ω
, 200
Ω
, and 400
Ω
. Verify
the accuracy of both channels with selected resistances. The accuracy
must be within the short-term accuracy given in the specifications.
7.4.4
Calibration Procedure (2567)
The calibration procedure for the 2567 module is the same as the 2560 except
the parameters 0_ADJ, 1K_ADJ, and 4K_ADJ are used to calibrate the mea-
surement at 0
Ω
, 1K
Ω
, and 4K
Ω
respectively.
1560 Thermometer Readout
User’s Guide
118
