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.
7.4
Calibration
This section explains the calibration procedure for the 2560/2567 SPRT
Module.
7.4.1
Calibration Parameters
The resistance measurement is derived from the ratio between the voltage mea-
surements of the input resistor and reference resistor (100
Ω
) using the follow-
ing equation.
resistance
ADJ ratio
=
⋅
−
+
−
[ .
(
)(
)
. ][(
.
8 3333 10
10
1 0
4
400_
100 0
1 0
.
)
( .
)]
+
+
−
100_
0_
ADJ ratio
ADJ
ratio
Three adjustable calibration parameters are used for calibration:
0_ADJ
,
100_ADJ
, and
400_ADJ
.
0_ADJ
directly affects the measurement at 0
Ω
. It has
negligible effect at 100
Ω
but significant affect at higher resistances.
100_ADJ
directly affects the measurement at 100
Ω
. It has negligible effect at 0
Ω
and
proportionately greater effect the higher the resistance.
400_ADJ
directly af-
fects the measurement at 400
Ω
. It has negligible effect at 0
Ω
and 100
Ω
with
greater effect the more the resistance deviates from 0
Ω
or 100
Ω
. 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.
7.4.2
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
.
1560 Thermometer Readout
User’s Guide
116
Содержание 1560 Black Stack
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Страница 20: ...1560 Thermometer Readout User s Guide 8 Figure 2 System Diagram...
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Страница 70: ...RESET SYSTEM PARAMETERS PRESS ENTER TO CONTINUE PRESS EXIT TO CANCEL 61 5 Soft Key Functions System Menu...