Model 6487 Reference Manual Calibration 16-7
Calibration procedure
The calibration procedure should be performed in the following order:
• Preparing for calibration
• Offset voltage calibration
• Current calibration
• Voltage source calibration
• Entering calibration dates and saving calibration
• Locking out calibration
Preparing for calibration
1. Turn on the Model 6487 and the calibrator; allow them to warm up for at least one
hour before performing calibration.
2. Press MENU, select CAL, then press ENTER. The instrument will display the
following:
CAL: VOFFSET
3. Use the up or down RANGE key to display the following:
CAL: UNLOCK
4. Press ENTER. The instrument will prompt for the calibration code:
CODE? 000000
5. Enter the present calibration code on the display. (Factory default: 006487.) Use
the up and down RANGE keys to select the letter or number and use the left and
right arrow keys to choose the position. Press ENTER to complete the process and
the unit will display:
CAL UNLOCKED
Followed by:
NEW CODE? N
6. With N displayed, press ENTER.
Offset voltage calibration
Before performing the remaining calibration steps, perform offset voltage calibration as
outlined below.
1. From the calibration menu, use the up or down RANGE key to display the
following:
CAL: VOFFSET
2. Press ENTER. The instrument will prompt as follows:
INPUT CAP
3. Connect the triax shielding cap to the rear panel INPUT jack.
4. Press ENTER to complete offset voltage calibration.
5. Press EXIT to return to normal display.
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