Wavetek 3000 - Harmonics Test

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 GeneratorOUTPUT step attenuator settings
indicated in the following table .
NOTE : To
test the OUTPUT step attenuator below-60dBm an
RF
amplifier (>20 dB gain) is required . Insert the 26 dB
wideband amplifier between the standard attenuator pad and
the spectrumanalyzer (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 dBmposition
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 spectrumanalyzer 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 Generatorcontrols as follows
FREQUENCY
selector

001 .000 MHz
MODULATION MODE

CW
MODULATION FREQ

(Inactive)
MODULATION FM/AM

(Inactive)
OUTPUTVERNIER

Fully
Clockwise
OUTPUT step attenuator

+10 dBm
2 . Connect
the Signal Generator RF out connector to the
RF input of
the spectrumanalyzer .
3
.
Set the spectrumanalyzer 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
RecordError on
Line of PTR
10 -10 12
20 -20
13
30 -30 14
60 -60 15
90 -90 16