HP 8753D Option 011 - Page 249

It pro
vides smo
oth dynamic
accuracy and
absolute amplitude
accuracy
in
the
0
30
dBm
input
p
o
w
er
region.
52
ADC Ofs
Cor. Measures
the A10
Digital IF
ADC linearit
yc
haracteristics,
using
an
internal
ramp generator,
and
stores
v
alues
for
the
optimal
op
erating
region.
During
measuremen
t,
IF
signals
are
cen
tered in
the optimal
region to
improv
elo
w-level
dynamic
accuracy.
53
Sampler
Cor.
Measures
the
absolute
amplitude
resp
onse
of
the
R
sampler
against
an
external
p
o
w
er
meter
via
HP-IB,
then compares
A and
B, (magnitude
and phase),
against
R. It
improv
es the
R
input
accuracy
and
A/B/R
trac
king.
54
Ca
v
Osc
Cor.
Calculates
the
frequency
of
the
ca
vit
y
oscillator
and
the instrumen
t
temp
erature
for
eectiv
e
spur
a
v
oidance.
55
Serial Cor.
Stores the
serial
n
um
b
er
(input
b
y
the
user
in
the
Displa
y
Title
men
u)
in
EEPR
OM.
This
routine
will
not
o
v
erwrite
an
existing
serial
n
um
b
er.
56
Option
Cor.
Stores
the
option
k
eyw
ord (required
for Option
002,
006,
010
or
an
y
com
bination).
57
Cal
Kit
Def.
Not
used.
58
Init
EEPR
OM.
This
test
initializes
the
EEPR
OM.
Displa
y
T
ests
These
tests
do
not
return
a
P
ASS/F
AIL
condition. All
six
am
b
er
fron
t
panel
LEDs
will
turn
o
if
the
test
passes.
The
displa
y
will
b
e
blank;
press
4
PRESET
5
to
exit
the
test.
If
an
y
of
the
six
LEDs
remain
on,
the
test
has
failed.
59
Disp/cpu
com.
Chec
ks
to
conrm
that the
CPU
can
comm
unicate
with
the
A19
GSP
b
oard.
The
CPU
writes
all
zeros,
all
ones,
and
then
a
w
alking
1 pattern
to
the
GSP
and
reads
them
bac
k.
If
the
test
fails,
the
CPU
rep
eats
the
w
alking
1
pattern
un
til
4
PRESET
5
is
pressed.
60
DRAM
cell.
T
ests
the
DRAM
on
A19 b
y writing
a test
pattern to
the
DRAM
and
then
v
erifying
that
it
can
b
e
read
bac
k.
61
Main VRAM.
Tests
the VRAM
b
y
writing
all
zeros
to
one
lo
cation
in
eac
h
bank
and
then
writing
all
ones
to
one
lo cation
in eac
hbank.
Finally a
w
alking
one
pattern
is
written
to
one
lo
cation
in
eac
h
bank.
62 VRAM bank.
Tests all the cells in eac
h of the 4 VRAM banks.
63 VRAM/video. Veries that the GSP is
able to successfully perform both write and
read shift register transfers. It also c
hecks the video signals LHSYNC, L
VSYNC, and
LBLANK to v
erify that they are active and toggling.
64 RGB
outputs. Conrms that the analog video signals are correct and it v
eries their
functionality.
65 Inten DAC. Veries that the intensityDAC can b e set b oth low and high.
10-10 Service Key Menus and Error Messages DRAFT
3/21/106 15:14
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