Specifications

Chapter 1 Performance Tests
Introduction
Assembly-Level Service Guide 15
• To verify the total number of accuracy places for frequency
measurements, it may be necessary to turn off Auto-Digit control. Use
this set of key depressions to turn AutoDigits OFF:
[Digits] / (AutoDigits) / <Off>
• The softkey menus shown in the test procedures represent the
functionality of the 53230A. The softkey menus for the 53210A and
53220A may be different depending on the function selected.
Recommended Calibration Cycle
The counter requires periodic verification of operation. Depending on the
use and environmental conditions, aging, and measurement accuracy
required, the counter should be checked using the operational verification
procedure at least once every year. The recommended calibration cycle for
specification accuracy is also one year.
Internal Auto-Calibration
An Internal Auto-Calibration feature is available (see Chapter 2 -
“Service”) that uses internal instrument standards to refine the accuracy
of the counter. It is recommended that Auto-Cal be performed regularly
(such as at the beginning of a shift change, starting a contemporary series
of measurements, after a large ambient temperature change, etc.) for
optimum counter performance.
NOTE Auto-Calibration is also a subset of the counter Self-Test.