Table of Contents
Advertisement
Model 7706 module
Calibration
The following procedures calibrate the temperature sensors on the Model 7706 plug-in module as well as the analog outputs.
Recommended test equipment
In order to calibrate the Model 7706, you will need equipment summarized in
Extender board connections
The Model 7706 being calibrated should be connected to the 7798-250B Calibration/Extender Board, and the extender board
must be installed in scanner Slot #1. Note that the module being calibrated will be external to the Model 2700 to avoid card
heating during calibration.
Table 7
Recommended calibration equipment
Description
Digital thermometer:18° to 28°C, ±0.1°C
Keithley 7798-250B Calibration Extender Board
Front panel Model 7706 temperature calibration
Before calibrating the temperature on the Model 7706, 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 calibra-
tion accuracy. Allow the Model 2700 to warm up for at least two hours.
1. Connect the Model 7706 to the 7798-250B Calibration Extender Board.
2. With the power off, install the Model 7706/7798 combination in Slot 1, and select the rear inputs with the INPUTS switch.
3. Press in and hold the Model 2700 OPEN key while turning on the power.
4. Allow five minutes for thermal equilibrium.
5. Accurately measure and record the cold temperature of the Model 7706 card surface at the center of the card.
6. Press SHIFT then TEST, then display TEST:CALIB with the up or down range key. Press ENTER, select RUN, then enter
the appropriate calibration code (default: 002700).
7. Using the up or down range key, select CARD at the CAL:RUN prompt, then press ENTER.
8. Using the up or down range key, select TEMP, then press ENTER.
9. Set the display value to the cold junction calibration temperature (°C) measured in step 4, then press ENTER to complete
Model 7706 temperature calibration.
34
Table
7.
NOTE
Advertisement
Table of Contents
