5.
Change the HP E1440A frequency to 19.9 MHz.
OUTPUT Vxi;":FREQ 19.9E6I1
6.
Set the HP E1440A phase reference, and step size to
1
degree.
OUTPUT Vxi
;
'I
:
PHAS
:REF
;
STEP
1
DEG"
7.
Using the following commands as appropriate, adjust the phase
for
a
minimum reading on the
DVM.
OUTPUT Vxi
;
"
:
PHAS
UP"
Increment phase
OUTPUT Vxi
;
"
:PHAS DOWN"
Decrement phase
8.
Record this minimum reading as
Vo.
9.
Calculate the
dB
ratio of
Vo
to
Vlk
using the following formula:
10.
Add
-6
dB
to the ratio to allow for the folding action of the
mixer, and record the result on the Performance Test Record.
The specification is
-55
dB or lower
(-54
dB
fails).
Note
The frequencies used minimize the phase noise contribution of the
r(rC
frequency synthesizer.
C-18
Performance
tests
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