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1560 Thermometer Readout
User's Guide
8.4
8.4.1
8.4.2
122
Calibration
This section explains the calibration procedure for the 2561 HTPRT Module.
Calibration Parameters
The resistance measurement is derived from the ratio between the voltage mea-
surements of the input resistor and the internal reference resistor (10Ω) using
the following equation.
=
+
resistance
( .
10 0
10
Two adjustable calibration parameters are used for calibration: 0_ADJ and
10_ADJ. 0_ADJ directly affects the measurement at 0Ω. It has negligible effect
at 10Ω. 10_ADJ directly affects the measurement at 10Ω. It has negligible ef-
fect at 0Ω. Each of the parameters has a positive effect at their primary
resistances: increasing the value of the parameter increases the measured resis-
tance. The default and theoretically normal value for each is 0.
Front-panel Access
The calibration parameters 0_ADJ, and 10_ADJ can be adjusted to optimize the
accuracy. They can be accessed from the front panel of the 1560 using the CAL
DEVICE soft-key function. This is found in the MODULE sub-menu.
Pressing the CAL DEVICE soft-key shows a list of devices with the module
position number. Use the UD buttons to move the cursor to the HTPRT mod-
ule and press ENTER.
SELECT A DEVICE TO CALIBRATE
>HPRT 1
TCS
2
PRTS 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.
+
_
ADJ ratio
)
0
_
ADJ
( .
1 0
−
ratio
)
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