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shows the device commands used to read or set the setup parameters of the PRT
Scanner Input Device.
Table 25 PRT Scanner Commands
Command
Below are some examples of using the device commands to set the device setup
parameters. For these examples it is assumed that the 2562/2568 PRT Scanner
Module is placed second in the stack. These commands can be sent through any
communication interface including the IEEE-488 and RS-232 interfaces.
SYST:MOD2:DEV1:WRIT "CURR",1.4 Set the excitation current to 1.4
mA.
SYST:MOD2:DEV1:READ? "CURR" Read the excitation current.
SYST:MOD2:DEV1:WRIT "WIRF",3 Set the front-row configuration to
three-wire.
9.4
Calibration
This section explains the calibration procedure for the 2562/2568 PRT Scanner
Module.
9.4.1
Calibration Parameters
Three adjustable parameters are used for calibration: 0_ADJ, 100_ADJ, and
400_ADJ. 0_ADJ directly affects the measurement at 0Ω. It has negligible ef-
fect at 100Ω but significant affect at higher resistances. 100_ADJ directly af-
fects the measurement at 100Ω. It has negligible effect at 0Ω and
proportionately greater effect the higher the resistance. 400_ADJ directly af-
fects the measurement at 400. It has negligible effect at 0Ω and 100Ω with
greater effect the more the resistance deviates from 0Ω or 100Ω. 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.
Device
Parameter
CURR
1, 1.4 (2562)
0.1, 0.05 (2568)
WIRF
3, 4
WIRR
3, 4
SAMP
2, 10
ARNG
AUTO, LOW, HIGH
9 2562/2568 PRT Scanner Module
Description
Excitation current, mA
Front-row wire configuration
Rear-row wire configuration
Sample period, seconds
Resistance range
Calibration
129
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