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1560 Thermometer Readout
User's Guide
7.4
7.4.1
7.4.2
116
Below are some examples of using the device commands to set the device setup
parameters. For these examples it is assumed that the 2560/2567 SPRT Module
is placed first in the stack. These commands can be sent through any communi-
cation interface including the IEEE-488 and RS-232 interfaces.
SYST: MOD1:DEV1:WRIT "CURR",1.4 Set the excitation current to 1.4
mA.
SYST:MOD1:DEV1:READ? "CURR" Read the excitation current.
Calibration
This section explains the calibration procedure for the 2560/2567 SPRT
Module.
Calibration Parameters
The resistance measurement is derived from the ratio between the voltage mea-
surements of the input resistor and reference resistor (100Ω) using the follow-
ing equation.
−
=
.
⋅
4
400_
resistance
[ .
8 3333 10
(
Three adjustable calibration parameters are used for calibration: 0_ADJ,
100_ADJ, and 400_ADJ. 0_ADJ directly affects the measurement at 0Ω. It has
negligible effect at 100Ω but significant affect at higher resistances. 100_ADJ
directly affects 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 400Ω. 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 a positive effect at their primary resistances: increasing the
value of the parameter increases the measured resistance. The default and theo-
retically normal value for each is 0.
Front-panel Access
The calibration parameters 0_ADJ, 100_ADJ, and 400_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
SPRT module and press ENTER.
−
+
ADJ ratio
)(
10
)
1 0
. ][(
100 0
+
+
100_
0_
.
ADJ ratio
)
ADJ
−
( .
1 0
ratio
)]
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