136 U1253B User’s and Service Guide
6 Performance Tests and Calibration
Calibration Overview
This manual contains procedures for verifying the
instrument performance, as well as procedures for making
adjustments where necessary.
Closed-case electronic calibration
The U1253B true RMS OLED multimeter features closed- case
electronic calibration. In other words, no internal
electro- mechanical adjustment is required. This instrument
calculates correction factors based on the input reference
signals you feed into it during the calibration process. The
new correction factors are stored in nonvolatile EEPROM
memory until the next calibration (adjustment) is performed.
The contents of this nonvolatile EEPROM memory will not
change even when the power is switched off.
Agilent Technologies’ calibration services
When you instrument is due for calibration, contact your
local Agilent Service Center for a low- cost recalibration.
Calibration interval
A one- year interval is adequate for most applications.
Accuracy specifications are warranted only if calibration is
performed at regular intervals. Accuracy specifications are
not warranted beyond the one- year calibration interval.
Agilent does not recommend extending calibration intervals
beyond 2 years for any application.
Make sure you have read “Test Considerations” on page 142 before
calibrating the instrument.
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