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Table 27 Thermistor Scanner Module Commands
Device Command
11.4
Calibration
This section explains the calibration procedure for the 2564 Thermistor Scan-
ner Module.
11.4.1
Calibration Parameters
Three adjustable parameters are used for calibration: 0_ADJ, 10K_ADJ, and
100K_ADJ. 0_ADJ directly affects the measurement at 0Ω. It has negligible ef-
fect at 10 kΩ but significant affect at higher resistances. 10K_ADJ directly af-
fects the measurement at 10 kΩ. It has negligible effect at 0Ω and
proportionately greater effect the higher the resistance. 100K_ADJ directly af-
fects the measurement at 100 kΩ. It has negligible effect at 0Ω and 10 kΩ with
greater effect the more the resistance deviates from 0Ω or 10 kΩ. Each of the
parameters has positive effect at their primary resistances: increasing the value
of the parameter increases the measured resistance. The default and theoreti-
cally normal value for each is 0.
11.4.2
Front-Panel Access
The calibration parameters 0_ADJ, 10K_ADJ, and 100K_ADJ can be adjusted
to optimize the accuracy. They can be accessed from the front panel of the 1560
using the CAL DEVICE function in the MODULE soft-key menu (see Sec-
tion 5.4.3). Select the THRS device. A window appears showing the calibration
parameters for the device.
SYST:MOD2:DEV1:WRIT "WIRF",4 Set the front-row configuration to
four-wire.
Parameter
CURR
AUTO, 2, 10
WIRF
WIRR
SAMP
ARNG
AUTO, LOW, HIGH
11 2564 Thermistor Scanner Module
Excitation current, μA
3, 4
Front-row wire
configuration
3, 4
Rear-row wire
configuration
2, 10
Sample period, seconds
Resistance range
Calibration
Description
143
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