Service and Maintenance 8
E364xA User’s and Service Guide 223
Calibration Reference
Before you calibrate the power supply, you must unsecure it by entering the
correct security code. Refer to “Calibration” on page 82 for more detailed
procedures to unsecure or secure the power supply.
Keysight calibration services
When your power supply is due for calibration, contact your local Keysight Service
Center for a low-cost calibration. The Keysight E3640A, E3641A, E3642A,
E3643A, E3644A, and E3645A power supplies are supported on calibration
processes which allow Keysight 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 remains within specification for the next calibration
interval. Keysight does not recommend extending calibration intervals beyond 1
year for any application. This criterion 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. Refer to “Electrostatic Discharge (ESD)
Precautions” on page 193 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 in “General
Disassembly” on page 198.
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
[1]
(located near
U121). Refer to “Component locator diagram for the main board assembly —
top” on page 233 and “Component locator diagram for the main board
assembly - bottom” on page 234.
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