Agilent Technologies E1441A user service Closed-CaseElectronic Calibration, Calibration Interval

Closed-Case Electronic Calibration

The function generator features closed-case electronic calibration since no internal mechanical adjustments are required for calibration. The function generator 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 memory does not change when power has been off or after a remote interface reset.)

Agilent Technologies Calibration Services

When your function generator is due for calibration, contact your local Agilent Technologies Service Center for a low-cost recalibration. The Agilent E1441A Function Generator is supported on automated calibration systems which allows Agilent to provide this service at competitive prices. Calibrations to MIL-STD-45662 are also available competitively.

Calibration Interval

The function generator should be calibrated on a regular interval determined by the measurement accuracy requirements of your application. A 1-year or 2-year interval is adequate for most applications. Agilent Technologies does not recommend extending calibration intervals beyond 2 years for any application.

Whatever calibration interval you select, Agilent Technologies recommends that complete re-adjustment always be performed at the calibration interval. This will increase your confidence that the Agilent E1441A will remain within specification for the next calibration interval. This criteria for re-adjustment provides the best long-term stability. Performance data measured using this method can be used to extend future calibration intervals.

Time Required for Calibration

The Agilent E1441A can be automatically calibrated under computer control. With computer control you can perform the complete calibration procedure and performance verification tests in less than 15 minutes. Manual calibrations using the recommended test equipment will take approximately 45 minutes.

Automated Verification and Calibration Procedures

Performance verification and adjustment programs are provided on the Agilent Universal Instrument Drivers CD. The directory path to these programs is <drive>:\examples\hpe1441. The program names are 1441ver.c and 1441adj.c for verification and adjustment respectively.

These programs were developed on a 486 IBM compatible PC running Windows NT®. The computer is equipped with an Agilent 82341 GPIB interface and Agilent VISA for GPIB software.

The programs automate the majority of the procedures using an Agilent 34401A benchtop Multimeter or an Agilent E1412A VXI Multimeter.

164 Service Procedures Appendix D