Section 4. Adjustments; Introduction; Equipment Required; Calibration Interval - HP 54501A Service Manual
100 mhz digitizing oscilloscope
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Also See for 54501A:
- Programming reference manual (386 pages) ,
- Operation reference (146 pages) ,
- Service manual (90 pages)
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4-1 . INTRODUCTION
This section provides adjustment and self
calibration procedures for the HP 54501A . The
assemblies with adjustments are: the power
supply, CRT monitor, and the system board.
Figures 4-1 and 4-2 are the testpoint and ad-
justment locations for the HP 54501A .
4-2. EQUIPMENT REQUIRED
Equipment required for adjustments is listed in
the Recommended Test Equipment table in
section 1 of this manual . Any equipment that
satisfies the critical specification listed in the
table may be substituted for the recommended
model .
4-3. CALIBRATION INTERVAL
The recommended calibration interval for the
HP 54501A is 2000 hours of operation (or two
years, whichever comes first) . The adjust-
ments are set at the factory on assemblies
when they are tested . However, adjustments
may be necessary after repairs have been
made to the instrument . Usually the only as-
sembly that may require adjustments is the as-
sembly that has been replaced .
4-4. HP 54501A SELF CALIBRATION
The HP 54501A has self-contained calibration
procedures that are executed after manual ad-
justments have been made to the System
Board Assembly . The self-calibration routines
execute automatic A/D, gain, offset, trigger,
and delay calibration and store the resulting
factors to non-volatile memory .
HP 54501A ADJUSTMENTS
SECTION 4
ADJUSTMENTS
Default values from system ROM are loaded to
non-volatile memory as a starting reference
before beginning adjustments on the System
Board Assembly .
When power is applied to the HP 54501 A and
the message cal ram checksum error re-cal in-
strument is displayed, the self calibration
procedures must be performed . Load the
default cal factors as instructed in paragraph
4-12, and then perform the self calibration in
paragraph 4-17 .
If the instrument does not pass the self calibra-
tion, perform all of the adjustment procedures
in this section . If the adjustments cannot be
made within the specified limits, one or more
of the replaceable modules must be replaced .
NOTE
An instrument warm-up
of 15 minutes is
recommended before adjustment
procedures are performed .
WARNING
Read the Safety
Summary at the begin-
ning of
this manual
before performing
any
adjustment procedures.
CAUTION
The adjustment
procedures are perform-
ed with the top cover of the
instrument
removed.
Take
care to avoid shorting or
damaging
internal
parts of
the
instru-
ment.
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