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3-24
4-wire RTD connections
Shown in
ing module, paired channels are used to perform the 4-wire measurement. The two input
leads of the RTD are connected to a primary channel (1 through 20), while the two sense
leads are connected to its paired channel (21 through 40). Channel 1 is paired to channel
21, channel 2 is paired to channel 22, and so on.
Temperature measurement configuration
The Model 2790 is configured to measure temperature from the temperature measurement
configuration menu. Use the following general rules to navigate through the menu
structure:
•
•
•
•
•
Figure 3-9
are 4-wire RTD connections to the Model 2790. For the 7702 switch-
Figure 3-9
4-wire RTD connections
Model 2790
A. Front panel inputs
H
CH 21-40
L
SENSE
Sense Low
Sense High
B. Model 7702 switching module
Press SHIFT and then SENSOR to enter the menu structure.
Cursor position is indicated by a flashing menu item or parameter. Cursor position
is controlled by the
With the cursor on a menu item or parameter, use the
through the available options.
A displayed menu item and parameter is selected by pressing ENTER.
You can exit from the menu structure by pressing EXIT. However, any ENTERed
selections will apply.
Model 2790 SourceMeter
Sense HI
Input HI
Input LO
Sense LO
Model 7702
Switching
Module
INPUT
Input Low
4-wire
RTD
Input High
and
keys.
®
Swich System Reference Manual
4-wire
RTD
H
CH 1-20
L
and
keys to scroll
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