HP 8753D Option 011 - Page 247

13
Rear
P
anel.
T
ests
the
abilit
y
of
the A9
CPU main
pro cessor
to write/read
to the
rear
panel con
trol elemen
ts. It
tests the
A16 rear
panel, and
A9 CPU
data
buering
and address
decoding.
(It do
es
not
test
the
HP-IB
in
terface;
for
that
see
the
HP-IB
Pr
o
gr
amming
Guide
.)
This
runs
only when
selected or
with ALL
INTERNAL.
14
Post
Reg. P
olls the
status register
of the
A8 p
ost-regulator,
and
ags
these
conditions: heat
sink
to
o
hot,
inadequate
air
o
w,
or
p
ost-regulated
supply
sh
utdo
wn.
15
F
rac
N
Con
t.
Tests
the abilit
yof
the A9
CPU
main
pro
cessor
to
write/read
to
the
con
trol elemen
ton
the
A14
fractional-N
(digital)
assem
bly
.
The
con
trol
elemen
t
m
ust
b
e
functioning,
and
the
fractional-N
V
CO
m
ust
b
e oscillating
(although not
necessarily
phase-lo
c
k
ed) to
pass.
16
Sweep
T
rig.
T
ests
the
sw
eep
trigger
(L
SWP)
line
from
the
A14
fractional-N
to
the
A10
digital
IF.
The
receiv
er
with
the
sw
eep
sync
hronizes
L
SWP.
17
ADC
Lin.
T
ests the
linearity
of the
A10
digital
IF
ADC
using
the
built-in
ramp
generator.
The
test
generates
a
histogram
of
the
ADC
linearit
y
,
where
eac
h
data
p
oin
t
represen
ts
the
relativ
e
\width"
of
a
particular
ADC
co
de.
Ideally
,
all
co des
ha
v
e
the
same
width;
dieren
t
widths
corresp
ond to
non-linearities.
18
ADC
Ofs.
This
runs only
when selected.
It tests
the
abilit
y
of
the
oset
D
A
C,
on
the
A10
digital
IF,
to
apply
a
bias
oset
to
the
IF
signals b
efore the
ADC input.
This
runs
only
when
selected.
19
ABUS
Test.
Tests
analog
bus
accuracy
,
b
y
measuring
sev
eral
analog
bus
reference
v
oltages
(all
no
des
from
the
A10
digital
IF).
This
runs only
when
selected.
20
FN
Coun
t.
Uses
the
in
ternal
coun
ter
to
count
the
A14
fractional-N
V
CO
frequency
(120
to
240
MHz)
and
the
divided
fractional-N
frequency
(100
kHz).
It
requires
the
100
kHz signal
from
A12
and
the
coun
ter
gate
signal
from
A10
to
pass.
External
T
ests
These
tests
require
either
external
equipmen
t
and
connections
or
op
erator in
teraction of
some
kind
to
run.
T
ests
30
and
60
are
comprehensiv
e
fron
t
panel
c
hec
ks,
more
complete than
test
12,
that
chec
ks the
front
panel
k
eys
and
knob
en
try
.
21
P
ort
1
Op
Chk.
P
art
of
the \Op
erator's Chec
k" pro
cedure, lo
cated
in
the
\Start
T
roublesho
oting"
c
hapter.
The
pro
cedure
requires
the
external
connection
of
a
short
to POR
T1.
22 Port 2 Op
Chk. Same as 21, but tests POR
T2.
23 FrP
an Seq.
Tests the fron
t panel knob en
try and all A1 fron
t
panel k
eys, as w
ell as
the fron
t panel micropro cessor on the A2 assem
bly. It prompts the user to rotate the
front panel knob, then press eac
hk
ey in an ordered sequence. It con
tinues to the next
prompt only if the curren
t prompt is correctly satised.
24 FrP
an Diag.
Similar to 23 ab o
ve,
but the user rotates the fron
t panel knob or presses
the keys in any order. This test displays the command the instrument received.
25 ADC Hist. Factory use only.
26 Source Ex. Factory use only.
10-8 Service Key Menus and Error Messages DRAFT
3/21/106 15:14
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