68 34405A User’s and Service Guide
4 Performance Tests and Calibration
Calibration Overview
Closed - Case Electronic Calibration
The instruments 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
When your instrument is due for calibration, contact your 
local Agilent Service Center for a low- cost recalibration. The 
34405A is supported on automated calibration systems, 
which allow Agilent to provide this service at competitive 
prices.
Calibration Interval
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 
NOTE
Make sure you have read “Test Considerations” on page 71 before 
calibrating the instrument.
34405A users guide.book  Page 68  Saturday, September 2, 2006  3:38 PM