Keithley Micro Ohmmeter 5802

Ensure the CALIBRATION switch is in the ENABLED position

Set the instrument to the 20 range using the front panel controls

Connect a known accurate resistor (e.g., +1.90850 reference resistor) to the Model 580 test leads

Enter the V command with the calibration value (e.g., V1.9085X)

Press the END LINE key after entering the V command to calibrate the instrument

Enter the LO command to store the calibration value

Press the END LINE key after entering the LO command to store the calibration

Is the CALIBRATION switch in the ENABLED position?

Is the instrument in DRIVE (_S-_), POL+, and line frequency set appropriately?

Connect calibration resistor to the Model 580 as shown in Figure 3-2.

Press SHIFT and REL simultaneously and hold until 'CAL' appears in the numeric field of the display, then release.

Apply a known resistance to the first range to be calibrated and adjust the display to read the exact resistance value.

Calibrate the next range using the same method.

Lock in new calibration constants by pressing SHIFT and REL simultaneously until 'Stor' appears.

Unplug the line cord and remove all test leads from the Model 580 terminals

Remove the top cover as explained in paragraph 1.2

Is the Model 5802 IEEE-488 Interface installed?

Remove the IEEE-488 Interface if installed

Replace the blown fuse with '/, A, 250V, 3AG, Slo-Blo (Keithley Part Number FU-20)

Note any persistent issues causing the fuse to blow

Turn off power to the Model 580

Disconnect the line cord from the Model 580

Remove all test leads from the terminals of the Model 580

Remove the four screws from the bottom of the case