Keithley 7710, Руководство пользователя

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21
Calibration
The following procedures calibrate the temperature sensors on the Model 7710 plug-in cards.
WARNING The information in this section is intended only for qualified service person-
nel. Do not attempt these procedures unless you are qualified to do so.
Recommended test equipment
In order to calibrate the Model 7710, you will need equipment summarized in Table 3 .
Table 3
Recommended equipment for Model 7710 calibration
Extender board connections
The Model 7710 being calibrated should be connected to the 7797 Calibration/Extender Board,
and the extender board should then be installed in scanner Slot #1. Note that the module being
calibrated will be external to the Model 27xx to avoid card heating during calibration.
Model 7710 calibration
NOTE Before calibrating the Model 7710, make sure that power has been removed from
the card for at least two hours to allow card circuitry to cool down. After turning on
the power during the calibration procedure, complete the procedure as quickly as
possible to minimize card heating that could affect calibration accuracy. Allow the
Model 27xx to warm up for at least two hours.
Front panel Model 7710 calibration
1. Connect the Model 7710 to the Model 7797 Calibration/Extender Board (see “ Extender board connec-
tions ” above).
2. With the power off, install the Model 7710/7797 combination in Slot 1 and select the rear inputs with the
INPUTS switch. Allow three minutes for thermal equilibrium.
3. Accurately measure and record the cold temperature of the Model 7710 card surface at the center of the
card with a digital thermometer.
4. Press in and hold the Model 27xx OPEN key while turning on the power.
5. Press SHIFT then TEST, and then display TEST:CALIB with the up or down range key. Press ENTER,
select RUN, and then enter the appropriate calibration code (default: 0027xx).
6. With NEW CODE? displayed, use the up or down range key to display N, and then press ENTER.
7. Using the up or down range key, select CARD at the CAL:RUN prompt, and then press ENTER.
8. Set the display value to the cold calibration temperature (°C) you measured in Step 3, then press ENTER
to complete Model 7710 calibration.
Digital Thermometer:
18 to 23˚C, ±0.1˚C
Keithley 7797 Calibration/Extender Board