Wavetek 171 - Page 20

Table
5-1.
Calibration
Chart
(Continued)
Step
Check
Tester
Cal
Points
Control
Settings
Adjust
Desired
Results
Remarks
17
Frequency
bits
Counter
5012 OUT
FREQ
MULT:
X 10K
Digital
Switch:
0.1111
thru
0.9999
Proper
reading
on
counter
18
Spectral
purity
Spectrum
Analyzer
Function:
\r
Digital
Switch:
1.9999
Spurious
signals
below —70
dB.
Noise
floor
be-
low
—60
dB-
Set
3580A controls
for
a 3 Hz
band-
width
with min-
mum
smoothing;
scanning
20 Hz/div
at 5s/div.
Check
that
average
of noise
floor
at f
0
+ 3
Hz
is
below
—60
dBc and
that no
line
related
spurs are
above —70
dBc.
Keep
power
lines
away
from
analyzer
input.
5-3