Agilent Technologies HP 83711B Service Guide

Troubleshooting
Oset
Synthesizer Incorrect
Frequency/Unlocked Errors
Error
Group
Description
15
=
4
Oset
Synth
- incorrect
freq at
13 MHz
15
=
8
Oset
Synth
unlocked
at
13
MHz
15
=
20
Oset
Synth
-
incorrect
freq
at 14.749
MHz
15
=40
Oset
Synth unlocked
at
14.749
MHz
15
=
100
Oset
Synth
-
incorrect
freq
at
14.75
MHz
15 =
200
Oset Synth
unlocked at
14.75
MHz
15
=
800
Oset
Synth
-
incorrect
freq
at
19.499
MHz
15
=
1000
Oset
Synth
unlocked
at 19.499
MHz
15
=
4000
Oset
Synth
-
incorrect
freq
at
19.5
MHz
15
=
8000
Oset
Synth
unlocked
at
19.5
MHz
15 =
20000
Oset Synth
-
incorrect
freq
at
26.5
MHz
15
=
40000
Oset
Synth
unlocked
at
26.5
MHz
15
=
100000
Oset
Synth
-
incorrect
freq
at
13
MHz
15
=
200000
Oset
Synth
unlocked
at
13
MHz
15
=
800000
Oset
Synth
-
incorrect
freq
at
26.5
MHz
15 =
1000000
Oset Synth
unlocked at
26.5 MHz
15
=
4000000
Oset
Synth
-
incorrect
freq
at
19.5
MHz
15
=
8000000
Oset
Synth
unlocked
at
19.5
MHz
15
=
20000000
Oset
Synth
-
incorrect
freq
at
19.499
MHz
15
=
40000000
Oset
Synth
unlocked
at
19.499
MHz
T
o
Troubleshoot
an
Oset
Synthesizer Incorrect
Frequency/Unlocked
Condition
1.
Connect
the
rear
panel
10 MHz
output of
the
synthesizer
to
the
external
reference
input
of
a
frequency
counter
.
2.
Disconnect
W10
from J9
on the
YO
loop and
oset
synthesizer
assembly
(A7)
and
connect
W10
to the
input
of
the
frequency
counter
through
a
20
dB
attenuator
.
3.
Verify
that
the
signal
at
W10
is
3
MHz
plus-or-minus
one
count.
If
the frequency
at W10
is
incorrect
or
missing,
check
the
continuity
of
W10
with
an
ohmmeter
.If
W10 is
opened, replace
W10.
If
W10
has
continuity
,
replace
the
LO
synthesizer
and
reference
assembly
(A6).
If
the
frequency at W10 is correct, continue with the next step
.
4. Disconnect the frequency counter from W10 and reconnect W10 to J9
through an SMC tee
connector.
5. Using an oscilloscope
, verify that the voltage at the tee connector is 4.5 Vp-p
6 0.5 Vp-p
.
If the voltage at the tee connector is incorrect or missing, go to the procedure \T
o
Troubleshoot a LO Synthesizer/Reference Unlocked Condition" under \LO Synthesizer and
Reference Assembly Troubleshooting," otherwise, continue with this procedure.
6. Disconnect W3 from J1 on the YO loop and oset synthesizer assembly and connect J1 to
the input of the frequency counter through a 20 dB attenuator.
7. Connect a voltmeter to J3 pin 2 on the YO loop and oset synthesizer assembly (connect
the voltmeter ground lead to A3TP4).
1-18 Troubleshooting

Agilent Technologies HP 83711B Specifications

General

Brand	Agilent Technologies
Model	HP 83711B
Category	Test Equipment
Language	English