Model 7700 Calibration; Recommended Test Equipment; Calibration Card Connections; Table 2-14 Recommended Equipment For Model 7700 Calibration - Keithley 2701 Service Manual

2-22 Calibration

Model 7700 calibration

The following procedures calibrate the temperature sensors on the Model 7700 plug-in
modules.
NOTE

Recommended test equipment

In order to calibrate the Model 7700, you will need equipment summarized in
Table 2-14
Recommended equipment for Model 7700 calibration
Digital Thermometer:
18° to 28°C, ±0.1°C
Keithley Model 7797 Calibration System

Calibration card connections

The Model 7700 being calibrated should be connected to the Model 7797 Calibration
System card and the card should then be installed in scanner Slot #1. (See the Model 7797
documentation.) Note that the module being calibrated will be external to the Model 2701 to
avoid card heating during calibration.
Model 7700 calibration
NOTE
Front panel Model 7700 calibration
1.
2.
3.
4.
For additional information about the Keithley modules, refer to the appropriate
appendix in the Model 2701 User's Manual.
Before calibrating the Model 7700, 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 possi-
ble to minimize card heating that could affect calibration accuracy. Allow the
Model 2701 to warm up for at least two hours.
Connect the Model 7700 to the Model 7797 Calibration System card (see
card connections" above).
With the power off, install the Model 7700/7797 combination in Slot 1 and select the
rear inputs with the INPUTS switch. Allow three minutes for thermal equilibrium.
Accurately measure and record the cold temperature of the Model 7700 card surface at
the center of the card with an RTD sensor.
Press and hold the Model 2701 OPEN key while turning on the power.
Model 2701 Service Manual
Table 2-14.
"Calibration