SELECT A DEVICE TO CALIBRATE
>SPRT 1
TCS
2
STHR 3
After the device is selected a new window appears showing the parameters and
functions available from the device. New values can be entered for the parame-
ters using the numeric buttons and pressing
ENTER
. The
UD
buttons can be
used to move between parameters.
CALIBRATE DEVICE: STHR
0 ADJ: 0.0
10K ADJ: 0.0
100K ADJ: 0.0
CAL DATE: 05-21-96
SER NUM: A29123
For the 2563 Thermistor module the list of parameters includes
0_ADJ
,
10K_ADJ
, and
100K_ADJ
as described above. The list also includes the cali-
bration date (CAL DATE) parameter, used to record the date the module was
calibrated, and the serial number parameter (SER NUM), used to record the se-
rial number of the module.
10.4.3
Calibration Procedure
Calibration requires adjustment of the
0_ADJ
,
10K_ADJ
, and
100K_ADJ
pa-
rameters at three specific input resistances. If the resistances used are approxi-
mately 0
Ω
, 10 k
Ω
and 100 k
Ω
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 performed
last as the adjustments of
0_ADJ
and
10K_ADJ
affect the measurement at 100
k
Ω
but
100K_ADJ
does not affect the measurements at 0
Ω
and 10 k
Ω
. Either
channel can be used for calibration. Set the conversion type to R(W) to display
resistance (see Section 5.2.1.1 ). The accuracy required of the resistance stan-
dards is 1/4 of the instrument accuracy: that is ±0.025
Ω
at 0
Ω
, ±0.12
Ω
(12
ppm) at 10 k
Ω
, and ±1.2
Ω
(12 ppm) at 100 k
Ω
.The recommended procedure is
as follows:
137
10 2563 Thermistor Module
Calibration
