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1560 Thermometer Readout
User's Guide
10.4
10.4.1
=
.
resistance
[ .
1111 10
10.4.2
136
Module is placed third 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",2 Set the excitation current to 2 μA.
SYST:MOD2:DEV1:READ? "CURR" Read the excitation current.
Calibration
This section explains the calibration procedure for the 2563 Thermistor
Module.
Calibration Parameters
The resistance measurement is derived from the ratio between the voltage mea-
surements of the input resistor and reference resistor (20 kΩ) using the follow-
ing equation.
−
⋅
×
6
(
100
K ADJ
_
)( .
2 0
ratio
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.
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 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
STHR module and press ENTER.
−
+
⋅
+
4
10
)
1
.
0 1 0 10
][( .
10
K ADJ
+
_
) .
2 0
ratio
0
_
ADJ
( .
−
1 0 1 0
.
ratio
)]
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