Calibration Procedure - Fluke 1560 Black Stack User Manual

1560 Thermometer Readout
User's Guide
11.4.3
144
CALIBRATE DEVICE: THRS
0 ADJ: 0.0
10K ADJ: 0.0
100K ADJ: 0.0
CAL DATE: 09-21-95
SER NUM: A32123
For the 2564 Thermistor Scanner Module the list of parameters includes
0_ADJ, 10K_ADJ, and 100K_ADJ as described above. The list also includes
the calibration date (CAL DATE) parameter, used to record the date the module
was calibrated, and the serial number parameter (SER NUM), used to record
the serial number of the module. New values can be entered for the parameters
using the numeric buttons and pressing ENTER. The UD buttons can be used
to move between parameters.

Calibration Procedure

Calibration requires adjustment of the 0_ADJ, 10K_ADJ, and 100_ADJ param-
eters at three specific input resistances. If the resistances used are approxi-
mately 0Ω, 10 kΩ and 100 kΩ respectively the adjustments are independent
and the procedure is simple. The order in which the adjustments are performed
is important. The adjustment of the 100K_ADJ parameter must be done last as
the adjustments of 0_ADJ and 10K_ADJ affect the measurement at 100 kΩ but
100K_ADJ does not affect the measurements at 0Ω or 10 kΩ. Any channel can
be used for calibration. Set the conversion type to R(Ω) to display resistance
(see Sec. 4.2.1.1). The accuracy required of the resistance standards is 1/4 of
the instrument accuracy; that is 0.05Ω at 0Ω, 0.25Ω (25 ppm) at 10 kΩ, and
2.5Ω (25 ppm) at 100 kΩ. The recommended procedure is as follows:
1.
Connect a 0Ω resistor to the input and measure its resistance. If a short-
ing wire is used the wire should run from pin 3 from the left to pin 4 to
pin 5 then back across to pin 2. Note the average error in the measure-
ment. Adjust the 0_ADJ parameter by subtracting the measured error.
For example, if the input is exactly 0.0Ω and readout shows –0.11Ω,
0_ADJ should be adjusted by adding 0.11 to it.
2. Connect a 10 kΩ resistor (25 ppm accuracy) to the input and measure its
resistance. Note the average error in the measurement. Adjust the
10K_ADJ parameter by subtracting the measured error. For example, if
the input is exactly 10.00000 kΩ and the readout shows 10.00295 kΩ,
10K_ADJ should be adjusted by subtracting 2.95 from it.