558 Chapter13
Softkey Descriptions
Softkey Descriptions
Understanding Analyzer Correction Data
The firmware uses correction data to improve instrument performance
by minimizing the effect of variations in hardware. There are two
categories of correction data.
• Self-calibration correction factors.
• Service-calibration correction constants.
Most correction data can be displayed and modified with the softkey
functions provided by
CAL.
Self-Calibration Correction Factors
Self-calibration correction factors enhance instrument accuracy by
adjusting DACs on the A7 analog interface assembly and by adding
offsets to trace information. The correction factor data is stored in
nonvolatile memory on the A16 processor/video assembly after pressing
CAL STORE.
The correction-factor data is produced by the
CAL AMPTD and CAL FREQ
self-calibration routines. The horizontal and vertical display positions,
adjusted by
CRT VERT POSITION and CRT HORZ POSITION, are also
retained.
Refer to the softkey descriptions in this section for further information.
Service-Calibration Correction Constants
The service-calibration correction constants enhance instrument
performance by compensating for frequency-response variation and
A12 amplitude control step-attenuation errors. The correction
constants are unique for each instrument.
The correction constants for frequency response can be viewed, or
modified, using
FLATNESS DATA. Refer to the frequency response
adjustment procedure in Chapter 2 for instructions on generating new
correction constants.
The correction constants for step-attenuation errors on the A12
amplitude control assembly can be modified using
SET ATTN ERROR.
Refer to the cal attenuator adjustment procedure in Chapter 2 for
instructions on generating new correction constants.
To Next Page
Loading...
Need help?
General
