Calibration 19-7
Calibration procedure
The calibration procedure should be performed in the following order:
• Preparing for calibration
•Offset voltage and input bias current calibration
•Volts calibration
• Amps calibration
• Coulombs calibration
• Ohms calibration
• Entering calibration dates and saving calibration
• Locking out calibration
NOTE Ohms calibration must be done last to allow charge to bleed off internal insulators.
Preparing for calibration
1. Turn on Model 6514 and the calibrator, and allow them to warm up for at least one hour
before performing calibration.
2. Press SHIFT then CAL. The instrument will display the following:
CAL: RUN
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?
5. Enter the current calibration code on the display. (Factory default: 006514.) 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:
NEW CODE? N
6. With N displayed, press ENTER.
Input bias current and offset voltage calibration
Before performing the remaining calibration steps, perform input bias current and offset volt-
age calibration as outlined below.
Offset voltage calibration
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 for a short:
INPUT SHORT
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