Agilent Technologies L4400 - Manual (Page 260)

248 L4400 User’s Guide
A L4451A and L4452A Calibration Procedures
Calibration Procedures
This section contains performance verification and adjustment
(calibration) procedures for the L4400 Series L4451A 4- Channel Isolated
D/A Converter and L4452A Multifunction Module.
Closed-Case Electronic Calibration These instruments feature closed- case
electronic calibration. No internal mechanical adjustments are required.
The instruments calculate correction factors based upon the readings
from a separate DMM sent to the instruments during the calibration
procedure. 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
When your instruments are due for calibration, contact your local Agilent
Service Center for low- cost recalibration. The L4451A and L4452A are
supported on automated calibration systems which allow Agilent to
provide this service at competitive prices.
Calibration Interval
The instruments should be calibrated on a regular interval determined by
the 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 L4451A and L4452A 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 instruments will remain within these limits unless the
adjustments are performed.
Use the Calibration Count feature (see page 251 ) to verify that all
adjustments have been performed.