Appendix Service Information
Calibration Reference
181
Service
Information
Calibration Reference
Before you calibrate the power supply, you must unsecure it by entering the
correct security code. See “Calibration Overview”, starting on page 62, for
more detailed procedures to unsecure or secure the power supply.
Agilent Technologies Calibration Services
When your power supply is due for calibration, contact your local Agilent
Technologies Service Center for a low-cost calibration. The Agilent E3640A/
41A/42A/43A/44A and E3645A power supplies are supported on calibration
processes which allow Agilent Technologies to provide this service at
competitive prices.
Calibration Interval
Recommended calibration interval for this power supply is 1 year. This will
ensure that your power supply will remain within specification for the next
calibration interval. Agilent Technologies does not recommend extending
calibration intervals beyond 1 year for any application. This criteria for re-
adjustment provides the best long-term stability.
To Unsecure the Power Supply Without the Security Code
To unsecure the power supply without the correct security code (when you
forget the security code), follow the steps below. See “Electrostatic Discharge
(ESD) Precautions” on page 160 before beginning this procedure.
1 Disconnect the power cord and all load connections from the power supply.
2 Remove the instrument cover. Refer to the disassembly drawing on page 164.
3 Connect the power cord and turn on the calibration mode by holding down the
Calibrate key as you turn on the power supply and hold down the key until you
hear a long beep. Be careful not to touch the power line connections.
4 Apply a short between the two exposed metal pads on JP107 (located near
U121). The JP107 is outlined with a circle on the Main Board Component
Locator (top side) drawing.
5 While maintaining the short, move to the security code and enter any unsecure
code in the calibration mode. The power supply is now unsecured.
6 Remove the short at JP107. (An error occurs if not removed.)
7 Turn off and reassemble the power supply.
Now you can enter a new security code. Be sure you take note of the new
security code.
