Keithley 2790, Справочное руководство

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3-26 Model 2790 SourceMeter
®
Swich System Reference Manual
The steps to configure 4-wire RTD measurements are provided in Table 3-4 . After press-
ing SHIFT and then SENSOR, the menu starts at step 1 to select measurement units.
Each time you press ENTER to make a selection, the menu will automatically go to the
next selection. After pressing ENTER for the last step, the instrument will return to the
normal measurement state.
klqb
As shown in Table 3-4 , you can select the USER sensor type, but you cannot
change the USER parameters from the front panel. The parameters for the
USER type can only be set using remote programming (see TEMPerature:FRTD
commands in
Table 3-5 ).
Temperature measurement procedure
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Make sure the INPUTS switch is in the correct position. To use front panel
inputs, it must be in the “F” (out) position. For switching modules, it must be in
the “R” (in) position.
1. If a switching channel is presently closed (displayed), press OPEN to open it.
2. Select the temperature measurement function by pressing TEMP.
3. Configure the temperature measurement as previously explained in “ Temperature
measurement configuration .”
4. Connect the temperature transducer(s) to be measured.
5. If using a switching module, perform the following steps to close the desired chan-
nel. Keep in mind, that for 4-wire RTD measurements, you will close the primary
(INPUT) channel for the 7702 module (1 through 20). The channel that it is paired
to will close automatically.
a. Press the CLOSE key.
b. Use , , , and to key in the channel number and press ENTER. The
previously closed channel(s) (if any) will open and the specified channel (or
channel pair) will close.
Table 3-4
4-wire RTD temperature measurement configuration
Step Menu Structure Description
1 UNITS: C, F, or K Select temperature measurement units
(°C, °F, or K).
2 SENS: 4W-RTD Select the 4-wire RTD transducer.
3 TYPE: PT100, D100, F100,
PT385, PT3916, or USER
Select 4-wire RTD type.