How To Restore Factory-Optimized Calibration Constants - HP 8340B Manual
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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
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