Wavetek 3000 - Impedance Test

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 measuredistortion .
The distortion
should be less than 4% .

Record thedistor-
tion
on line 43 of the PTR .
5 .

Set the meter
range switch of the
modulationmeter 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 witha VSWRbridge 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 520MHz and the return loss
versus frequency is
displayed .
1 . Set
the Signal Generator
FREQUENCY selector
MODULATIONMODE
MODULATIONFREQ
MODULATIONFM/AM
OUTPUT VERNIER
OUTPUT
step
attenuator
controls as
follows :
520 .000 MHz
CW
(Inactive)
(Inactive)
+3 dBm reading on
OUTPUTmeter
-10 dBm