HP 4262A User Manual

Model 4262A
Section V
Paragraphs 5-1 to 5-15
SECTION V
ADJUSTMENT
5-1. INTRODUCTION. WARNING
5-2. This section provides the information needed ADJUSTMENTS DESCRIBED
to adjust the 4262A to its specifications (listed in
Table 1-1). Prime purpose of adjustment is to
return the instrument to its peak operating capa-
bilities after repairs have been made. The instru-
ment should be tested and adjusted when a part or
component has been replaced. Adjustments some-
times restore an instrument to its normal operating
conditions without the necessity of repairs. Adjust-
ment procedures can also be performed periodical-
ly to maintain top operating performance. Re-
commended adjustment schedule for the 4262A is
every 12 months. All adjustable components refer-
red to in individual tests are summarized in Table
5-1 and adjustments locations are identified pic-
torially on the foldout sheets in Section VIII. If
proper performance cannot be achieved after ad-
justment procedures have been performed, refer to
troubleshooting procedures beginning with para-
graph 8-42,
Note
Before performing any adjustments,
warm up instrument for more than
60 minutes to stabilize operating
conditions.
5-3. SAFETY REQUIREMENTS.
5-4. Although the instrument has been designed in
accordance with international safety standards, this
manual contains information, cautions, and warn-
ings which must be followed to ensure safe opera-
tion and to keep the instrument in safe condition
(see Sections II and III). Adjustments described in
this section should be performed only by qualified
service personnel.
WARNING
ANY INTERRUPTION OF THE
PROTECTIVE (GROUNDED)
CONDUCTOR (INSIDE OR OUT-
SIDE THE INSTRUMENT) OR
DISCONNECTION OF THE PRO-
TECTIVE EARTH TERMINAL IS
LIKELY TO MAKE THE INSTRU-
MENT DANGEROUS. INTEN-
TIONAL INTERRUPTION IS
PROHIBITED.
5-5. The opening of covers for removal of parts,
except those to which access can be gained by
hand, is likely to expose live parts. Accessible
terminals may also be live.
5-6. Capacitors inside instrument may still be
charged even if instrument has been disconnected
from its source of supply.
HEREIN ARE PERFORMED WITH
POWER SUPPLIED TO THE IN-
STRUMENT AFTER PROTEC-
TIVE COVERS HAVE BEEN RE-
MOVED. ENERGY EXISTING AT
MANY POINTS MAY, IF CON-
TACTED, RESULT IN PER-
SONAL INJURY.
5-7. EQUIPMENT REQUIRED.
5-8. The equipment needed to adjust the Model
4262A is listed in Table 1-4 (Page 1-6). This
equipment should always be calibrated to satisfy its
own specifications and those of the required
characteristics. If the recommended model is not
available, any instrument that has specifications
equal to or better than required specifications may
be substituted.
5-9. FACTORY SELECTED COMPONENTS.
5-10. Factory selected components can be
recognized by an asterisk near the reference
designator on the schematic diagrams in Section
VIII (a nominal value is shown). Section VI,
Replaceable Parts, lists the part number of the
nominal value component. If the nominal value of
the selected component is changed, the Manual
Changes supplement, supplied with this manual,
will list the change to update the manual. Table
5-2 lists all factory selected components with their
nominal value ranges and their influence on instru-
ment performance.
5-11. Adjustable components, with reference
designators, are listed in Table 5-1. The table gives
the name of the control to be adjusted and the
purpose of its adjustment.
5-12. ADJUSTMENT RELATIONSHIPS.
5-13. The adjustment procedures, beginning with
paragraph 5-20, should be performed in step
sequence as they are interactive. Neglecting or
changing procedures may make it impossible to
gain best 4262A performance. Table 5-4 shows
alignment procedures required when repairing the
instrument (replacement of a component or
board). The adjustments in Table 5-4 assume that
no other adjustments were attempted prior to
board or component replacement.
5-14. ADJUSTMENT LOCATIONS.
5-15. For reference, overall adjustment location
illustrations are given in Figure 8-22. The locations
of individual board assemblies are denoted in board
assembly component location illustrations included
on each foldout service sheet.
5-1

HP 4262A Specifications

General

Brand	HP
Model	4262A
Category	Measuring Instruments
Language	English