Wavetek 3000 - AM Distortion Test

4 .13 AM DISTORTION TEST
SPECIFICATION
Distortion

<3% distortion to 70% AM (<5% to 90% AM) at a frequency of
METHOD
EQUIPMENT
1 kHz (Typ <1 .5% to 30% AM)
ModulationMeter

Radiometer AFM2
DistortionAnalyzerHP334A
PERFORMANCE TESTS
Thisspecificationapplies for output limits _<+3 dBm . AM
is possibleabove +3 dBm if the peak of the modulated output
does not exceed +13 dBm .
Themeasurement is
made
with a modulation meter and a dis-
tortion analyzer,
whichmeasures the distortion of the de-
modulated AM
from the modulationmeter . The measurement is
made at the minimum leveler point
where the AM distortion is
normallyworst-case .
PROCEDURE

1 . Set the Signal Generator
controls as follows :
FREQUENCY selector

520 .000 MHz
MODULATIONMODE

AM
MODULATION FREQ

1
kHz
MODULATION
FM/AM

0% AM
OUTPUT
VERNIER

-7 dBm
reading on
OUTPUT
meter
OUTPUT step attenuator

0 dBm
2 . Connect the equipment as shown in Figure 4-5 .
Figure 4-5 . AM DistortionSetup
3 .

Set the modulationmeter to read %AM at 520 MHz .

Set the
RF input attenuation to 10 dB, the IF bandwidth to ±400 kHz,
Model 3000
Signal Generator
Modulation Meter
Distortion Analyzer
Input
RF
AF O
RF Out
Input
Output
O