Tektronix 2445, Instruction Manual

Page: 119 / 351

Section 5— 2445 Service
ADJUSTMENT PROCEDURE
INTRODUCTION
IMPORTANT— PLEASE READ BEFORE USING THIS PROCEDURE
The “Adjustment Procedure" is used to restore optimum performance or return the instrument to conformance with its
“Performance Requirements" as listed in the “Specification" (Section 1). As a general rule, these adjustments should be
performed every 2000 hours of operation or once a year if used infrequently.
PARTIAL PROCEDURES
This procedure is divided into subsections to permit cali­
bration of individual sections of the instrument whenever
complete instrument calibration is not required. To perform
a partial procedure, first set the instrument as directed in the
Initial Setup Conditions at the beginning of the section, then
make any changes called for within the procedure. Perform
all steps within a subsection, both in the sequence present­
ed and in their entirety to ensure that control settings will be
correct for the following steps.
The adjustments in CAL 01, 02, 03, and 04 should be
performed in numerical sequence, i.e., CAL 01 should be
done before CAL 02, CAL 02 should be done before CAL
03, etc. Performing partial procedures when setting the
automatic calibration constants (i.e. only one or two of the
CAL steps) is not recommended and should only be done if
the calibration constants set in the preceding steps are
known to be correct.
BEFORE YOU BEGIN:
N O T E
When performing an y o f the autom atic calibration
routines (CAL 01 ihrough CAL 04), the C A L /N O CAL
ju m p er P 501 m ust be m oved to its CAL position (be­
tw een pins 1 an d 2 ) before turning the p o w e r on.
When the desired calibration has been performed, re­
turn the ju m p er to its N O CAL position.
a. Turn instrument Power on.
N O T E
The instrum ent M U S T have a 20-m inute warmup peri­
o d before m aking an y adjustments. Performing the
adjustm ent procedure while the tem perature is drifting
m ay cause erroneous calibration settings.
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