Model
8642A/B
Adjustments
5-3.
CORRECTION
DATA
SPECIAL
FUNCTIONS
Identifying
the Contents
of
the
A20
The
following is a
procedure
to
display and identify
the
contents
of
the
A20 Board.
1.
Switch the
HP
8642
to
Standby.
2.
Plug
the
A20
on
to
A3J3.
3.
Switch
the
HP
8642 ON.
4.
Key in:
ISHIFTllspcq
~
to
enter
service mode.
5.
Key in:
@]
~
IHzl
to
display
the
Module
ID numbers
corresponding
to
Valid Cal
Data
in
the
A20
Board.
The
A20
board
can
be
thought
of
as having
10
memory
locations.
The
address
of
each
location,
(numbered
0 through
9),
is
the
Module
ID Number.
Each
memory
location
will
either
contain
Valid Cal
Data
or
it will be bInnk.
The
A20 addresses
that
contain
Valid Cal
Data
will
now
be
displayed.
Some
examples
of
the
HP
8642 display are
shown
below. Refer
to
Table
5-4
to
cross
reference
the A20 addresses
(Module
ID
NlImbers)
to
the
Memory
Contents.
A20
containing
HP
8642A Cal Data Backup: I VALID CAL=
01234
6
89.U6191
A20
containing
HP
8642B Cal Data Backup: I VALID CAL=
0123456789
.UiiiJ
A20 provi ded with A
19
ex ch a nge
mod
ule:
LI
V~A....:..=.L1:..::D--=.C.:...A:..::L:....=
____
5=-6.:.....:...7_---=--:.
U=-6=-1~9:....J1
A20 provided with A6 excha nge module: I
L
V_A_L_I_D_C_A_L_=
___
3
____
._U_6_1_9....J1
(n
A20
containing"no
data: I VALID CAL= 0
.U6191
Tuh/e 5-4. II/or/II
Ie
I
J)
NlIl11hef"S.
--
10
Number
Memory Contents
-
0
Model
#,
Serial
#,
Options
1
A11
Cal Data
2
A12 Cal Data
3
A6
Cal Data
4 A13 Cal Data
5
A19
Doubler Cal Data
6
A16
or
A19
Attenuator
Cal Data
7
A19
Rev. Pwr.
Protect
Cal Data
8
A14
Cal Data
9
A2
Cal Data
(1)
In
a newly Initialized A20
boald
thele will be data stoled
In
location 0
Tile
data will be Model
#-
HP 864--, Serial
#:
----------
and no options
5-5
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