Impedance Test - Wavetek 3000 Instruction Manual

PERFORMANCE TESTS
4 .17
IMPEDANCE TEST
SPECIFICATION
EQUIPMENT
PROCEDURE
4- 26
Spectrum Analyzer
HP8554L/8552B/141T
Sweep/Signal
Generator
Wavetek 2001
VSWR Bridge
Wiltron 60N50
Coaxial Short,
Type N Female
HP11511A
+FM,
the meter range switch to 3 and the filter
bandwidth
to 50 Hz-15 kHz .
The modulation meter should read approxi-
mately 3 kHz .
4 .
Calibrate the distortion analyzer and measure distortion .
The distortion should be less than 4% .
Record the distor-
tion on line 43 of the PTR .
5 . Set the
meter range switch of the
modulation meter to
300 .
Set the Signal Generator
MODULATION MODE to FMx100 .
6 .
Adjust the Signal Generator MODULATION FM/AM for a read-
ing of 300 kHz deviation on the modulation meter .
7 .
Calibrate the distortion analyzer and measure the distor
tion .
The distortion should be less than 2% . Record the
distortion on line 44 of the PTR .
Impedance
50 ohm, .VSWR 1 .2 at RF output levels below 0 .1 V .
METHOD
The measurement is
made with a VSWR bridge and
the return
loss is displayed on a spectrum analyzer . An RF signal from
a sweep/signal generator is fed to the input of the bridge .
A reference level is
established by shorting the
bridge
output port .
The short is replaced by the RF impedance of
the Signal Generator .
The sweep/signal generator is tuned
from 1 to 520 MHz and the
return loss versus frequency is
displayed .
1 .
Set the Signal Generator
FREQUENCY selector
MODULATION MODE
MODULATION FREQ
MODULATION FM/AM
OUTPUT VERNIER
OUTPUT step attenuator
controls as follows :
520 .000 MHz
CW
(Inactive)
(Inactive)
+3 dBm reading on OUTPUT meter
-10 dBm