HP 8340b User Manual

HOW TO
RESTORE
FACTORY-OPTIMIZED
CALIBRATION
CONSTANTS
A
printed
copy
of
protected
data
is
included
with
each
instrument.
It
is
stored
in
a
bracket located
under
the
top
cover,
on
the
left side
of the
instrument
(as
viewed from
the
front).
If
working
and
protected
data in
RAM
are
lost,
use
the
information
on
this
sheet
to
restore
the
cal
constants.
When
the
instrument
is
recalibrated,
the
printed
copy
protected
data should be
updated and placed
back
in
the
Instrument (remember
to
update protected
data
after recalibration). Figure
A-3
shows
an
example
of
a
calibration constant
printed
copy.
1. Remove
the
top
cover
of
the
instrument.
Inside
the
instrument,
find
the
printed
copy
of
calibration
constants
(they
are
in
a
metal
bracket
on
the
left
side
of
the
instrument, as
viewed
from
the
front).
2.
Replace
the
top
cover.
t
CAUTION
j
This
procedure
affects
data required
for
optimum
instrument
perfor¬
mance.
Be
careful when
accessing
or
changing
calibration
data.
3.
To
access
the
calibration
constants, press:
[SHIFT]
[GHz]
[1]
[Hz]
[SHIFT]
[MHz]
[1] [2]
[Hz]
[SHIFT]
[KHz]
[2] [2]
[Hz]
The
value
of
calibration
constant
#1
is
displayed
in
the
ENTRY
display.
4.
Compare
the
value
on
the
ENTRY
display
with
the
value
listed
in
the
print-out.
If
the
values
do
not
match:
a.
Enter
the
value from
the
print-out
via the
DATA
ENTRY
keyboard.
b.
Press
[Hz].
5.
To
see
the
next
calibration
constant, press
the
up
STEP
key.
6.
Repeat
steps
4
and
5
until all
calibration
constants
are
the
same as
those
shown
on
the
print-out.
7.
To
store
the
entered calibration
constants
into
protected
memory,
press:
[SHIFT]
[MHz]
[1] [4]
[Hz]
[SHIFT]
[KHz]
[5] [3] [4] [9]
[Hz]
CALIBRATION STORED
appears
in
the
ENTRY
display.
8.
Press
[INSTR
PRESET].
The
FAULT
indicator should
be
off.
If It
is still
on,
suspect
a
problem
with the
instrument's
memory.
9.
Replace
the
print-out
inside the
instrument.
HP8340B/41B
Change
7
Assembly-Level
Service
Calibration
Constants
A-23

HP 8340b Specifications

General

Brand	HP
Model	8340b
Category	Inverter
Language	English