HP 8340B Manual page 21

Save/Recall Register Initialization
1.
To reinitialize the
save/recall registers
in
RAM
(this function does not effect the Cal Constants),
press:
[SHIFT] [MHz] [1] [8]
[SHIFT] [kHz] [0] [Hz]
2.
Turn the instrument off then on, and press [INSTR PRESET].
Calibration Constant Password Enable
This
procedure lets you
prevent viewing or manipulation
of instrument calibration constants without
a
password (number)
NOTE:
Once the password is
entered,
the instrument allows calibration constant
access
until
[INSTR PRESET]
is
pressed.
1.
To activate the password function, press:
[SHIFT] [GHz] [8] [2] [Hz]
[SHIFT] [MHz] [1] [2] [Hz]
[SHIFT] [kHz] [2] [2] [Hz]
[-][2][3][8][7][5][Hz]
This key sequence accesses
cal constant
#82 (LOCKWORD ENABLE)
and sets
it to
-23,875,
enabling the lockword function.
2.
To change the password number:
The
password number
is held
in cal
constant
#81 (LOCKWORD)
and
is
factory set to
0.
a.
Access cal constant
#81
(press the down
arrow STEP
key).
b.
Use the ENTRY keyboard
to enter
a
number between —32,768 and 32,767.
c.
To terminate the
entry,
press [Hz].
The number entered
is the password required to access the calibration constants.
3.
Remove jumper A59W2
on the A59 digital interface assembly.
4.
If
you
forget the password, re-install Jumper
A59W2
to disable the password
function.
How to Enter
a
Password
1.
To access the location (subchannel) where the password is
required, press;
[SHIFT] [MHz] [2] [0] [Hz]
[SHIFT] [kHz]
2.
Enter the password:
a.
Use the keyboard to enter the password number.
b.
Press
[Hz].
NOTE:
To enter
a password via HP-IB, type
"SHMZ20HZ SHKZ###HZ"
(###
is
the password
number).
When the correct password
is
entered,
you can
access the calibration constants as described
in
the preceding procedures.
The password
allows access to calibration constants until you
press
[INSTR PRESET] (HP-IB:
IP).
HP 8340B/41B
Assembly-Level
Service
Calibration Constants A-15