Technical data

44 34980A Service Guide
3 Calibration Procedures
Calibration Procedures
This manual contains procedures for verification of the instrument’s
performance and adjustment (calibration).
Closed-Case Electronic Calibration The instrument features closed- case
electronic calibration. No internal mechanical adjustments are required.
The instrument calculates correction factors based upon the input
reference value you set. The new correction factors are stored in
non- volatile memory until the next calibration adjustment is performed.
Non- volatile EEPROM calibration memory does not change when power
has been off or after a remote interface reset.
Agilent Technologies 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 6 for information on contacting Agilent.
Calibration Interval
The instrument should be calibrated on a regular interval determined by
the measurement accuracy requirements of your application.
A 1- year interval is adequate for most applications. Accuracy
specifications are warranted only if adjustment is made at regular
calibration intervals. Accuracy specifications are not warranted beyond the
1- year calibration interval. Agilent does not recommend extending
calibration intervals beyond 2 years for any application.
Adjustment is Recommended
Specifications are only guaranteed within the period stated from the last
adjustment. Whatever calibration interval you select, Agilent recommends
that complete re- adjustment should always be performed at the calibration
interval. This will assure that the 34980A will remain within specification
for the next calibration interval. This criteria for re- adjustment provides
the best long- term stability.
Performance data measured during Performance Verification Tests does not
guarantee the instrument will remain within these limits unless the
adjustments are performed.
Use the Calibration Count feature (see page 48) to verify that all
adjustments have been performed.