A33J1 Output Check (With Phase Lock Loop Open) - HP 8340B Manual

A33J1 OUTPUT CHECK (WITH PHASE LOCK LOOP OPEN)
Test Setup
ON THE DUT:
The DUT should still
be set to
a
CW
frequency of
4530
MHz
with its
10
MHz
REF connected
to the
spectrum analyzer's FREQ REFERENCE
input. Disconnect
A31W2, remove the
SMB
Tee, and
con¬
nect the output of A33J1 directly to the input of the spectrum analyzer.
ON THE SPECTRUM ANALYZER:
As shown in
the figures on the following
page:
OTHER EQUIPMENT:
WV^^^^W^^f
f
CAUTION
j
Do not
apply
a
positive voltage to A30TP1.
Set the
HP 6294A power
supply to
about —0.5V.
Plug
in
a
dual
banana to BNC connector across the
ground and negative outputs. To
this
connect a
BNC
cable with
a
BNC to clip lead
adapter
on the other
end.
Measure
the output of the
power
supply with
a
digital
voltmeter to determine which output lead is
ground and which is
negative.
Connect the ground side to
ground (A31P1-pin 5)
and the negative side
to A33TP1 (TUNE). Slowly adjust the power supply
until
the output of the
VCO
is
approximately
375
MHz (TUNE
voltage approximately
-11V).
Proper Waveform Parameters
As shown in
views
A
and
B,
on the following page, and within the following parameters:
Frequency
=
approximately
375
MHz
Power
=
approximately
0
dBm
±
3
dBm
Harmonics
=
^
-20dBc
B-30
M/N
Loop Assembly-Level Troubleshooting
HP 8340B/41B