Harmonics Test - Wavetek 3000 Instruction Manual

4 .6 HARMONICS TEST
SPECIFICATION
METHOD
EQUIPMENT
Spectrum Analyzer
PROCEDURE
PERFORMANCE TESTS
12 . Repeat steps 3 through 11 using the standard attenuator
pads and the Signal Generator OUTPUT step attenuator settings
indicated in the following table .
NOTE : To test the OUTPUT step
attenuator below -60 dBm an
RF amplifier
(>20 dB gain) is required . Insert the 26 dB
wideband amplifier between the standard attenuator pad and
the spectrum analyzer (Figure 4-1) . The allowable error
for the -90 dBm setting (step 11) is ±1 .5 dB .
The OUTPUT
step attenuator can be tested down to the -130 dBm position
if a 40 dB RF amplifier is used and if precautions are taken
to properly shield the RF output from the Signal Generator .
Harmonics Outputs >30 dB below fundamental from 10 to 520 MHz
>26 dB below fundamental from 1 to 10 MHz
A spectrum analyzer is used to measure harmonics
in
the
frequency range of the Signal Generator
at +13 and +3 dBm
output levels .
HP8554L/8552B/141T
1 . Set the Signal Generator controls as follows
FREQUENCY selector
001 .000 MHz
MODULATION MODE CW
MODULATION FREQ (Inactive)
MODULATION FM/AM (Inactive)
OUTPUT VERNIER Fully Clockwise
OUTPUT step attenuator
+10 dBm
2 . Connect the
Signal Generator RF out connector to the
RF input of the spectrum analyzer .
3 .
Set the spectrum analyzer to measure the harmonic dis-
tortion of the Signal Generator for fundamental frequencies
between 1 and 10 MHz . Set the bandwidth to 100 kHz, the
4- 11
Steps 4 and 8
Attenuator pad
dB -- -
Step 7
OUTPUT Step Attenuator
dBm setting
Step 11
Record Error on
Line of PTR
10 -10 12
20 -20
13
30 -30 14
60 -60 15
90 -90 16