User manual

1 Calibration Procedures
Agilent Calibration Services
2 U1271A/U1272A Service Guide
Agilent Calibration Services
Agilent Technologies offers calibration services at competitive
prices. When your instrument is due for calibration, contact
your local Agilent Service Center for recalibration. See
“Types of Service Available” on page 44 for more
information on the various calibration services offered.
Closed case calibration
The U1271A and U1272A handheld digital 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.
Calibration interval
The instrument should be calibrated on a regular interval
determined by the measurement accuracy requirements of
your application.
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 two years for any application.