Wavetek 171 - Page 20

Table 5-1. Calibration Chart (Continued)
Cal
Control
Desired
Step
Check
Tester
Points
Settings Adjust Results
Remarks
17
Frequency
Counter
50Q OUT
FREQ
MUL
T:
X
10K
Proper
bits
Digital
Switch: 0.1111
reading on
thru
0.9999
counter
18
Spectral
Spectrum
Function:~
Spurious signals
Set
3580A
controls
purity
Analyzer Digital Switch: 1.9999
below-70
dB.
for a 3
Hz
band-
Noise floor be-
width with min-
low-60
dB-
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