HP 8753D Option 011 - Page 252

Service
Key Menus
- Service
Features
The service
feature men
us
are
sho
wn
in
Figure
10-3
and
describ
ed
in
the follo
wing paragraphs.
The
follo
wing
k
eys
access
the service
feature men
us:
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SERVICE
MODES
N
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N
ANALOG
BUS
on
OFF
N
N
N
N
N
N
N
NN
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N
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PEEK/POKE
N
N
N
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FIRMWARE
REVISION
Figure
SERVFEA
T here.
Figure
10-3.
Service
Feature Menus
Service
Modes
Menu
T
o
access
this
men
u,
press
4
SYSTEM
5
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SERVICE
MENU
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SERVICE
MODES
.
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SERVICE
MODES
Allo
ws
y
ou
to con
trol and
monitor v
arious circuits
for
troublesho
oting.
N
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FRACN
TUNE
on OFF
(SM1)
T
ests
the
A13 and
A14
fractional-N
circuits.
It
allo
ws
y
ou
to directly con
trol and monitor the output frequency of the
fractional-N syn
thesizer (10 MHz to 60 MHz). Set the
instrument
to CW sw
eep mo de and then set FRA
CN TUNE ON.
Change frequencies with the fron
t panel k
eys or knob. The output
of the A14 assem
bly can be c
hecked at A14J1 HI OUT (in high
band) or A14J2 LO OUT (in lo
w band) with an oscilloscop e,
a frequency coun
ter, or a sp ectrum analyzer.
Signal jumps
and changes in shap e at 20 MHz and 30 MHz when tuning
up in frequency, and at 29.2 MHz and 15 MHz when tuning
down, are due to switching of the digital divider. This mo de
can b e used with the SRC TUNE mo de as describ ed in \Source
Troubleshooting" chapter.
DRAFT
3/21/106 15:14
Service Key Menus and Error Messages 10-13
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