8 Service and Maintenance
Calibration Reference
214 E364xA User’s and Service Guide
Calibration Reference
Before you calibrate the power supply, you must unsecure it
by entering the correct security code. Refer to
“Calibration” on page 61 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 E3646A, E3647A, E3648A, and E3649A 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 182 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 as shown in
Figure 8- 1.
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