Loops Assembly-Level Troubleshooting; Loops Assembly-Level Troubleshooting; Troubleshooting Phase Lock Loop - HP 8340B Manual

20-30
Loops
Assembly-Level Troubleshooting
TROUBLESHOOTING PHASE LOCK LOOP
2
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CAUTION
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This instrument contains assemblies that are susceptible
to damage
from static electricity. Troubleshoot at
a
workstation equipped with
a
grounded anti-static mat and
wrist
bracelet. Place any removed
assem¬
blies
on a
anti-static
surface
or inside an anti-static bag.
Verifying the Operation of the A40 PLL2 VCO
1.
Disconnect the five coax cables connected to the PLL2 VCO:
A43J1
A40J1
A40J2
A40J3
A40J4
2.
Press [INSTR PRESET].
Using
a
spectrum analyzer, measure the locations shown
in
the
following
table, and verify the
frequency and power at the following
points:
Instrument
State
INSTR PRESET
INSTR PRESET
INSTR PRESET
STOP FREQUENCY
=
10.05 MHz
CW MODE
STOP FREQUENCY
=
15
MHz
Measurement
Location
A40J1
A40J2
A40J3
A40J3
A40J3
A40J4
Normal Output
Frequency
(CW)
>150MHz
>300
kHz
>300 kHz
>6MHZ
>300 kHz
>30 Mhz
Normal
Output
Power
(approximate)
-18dBm
-15dBm
-15dBm
-5dBm
-5dBm
0
dBm
HP 8340B/41B
20-30
Loops Assembly-Level Troubleshooting