Impe Dance Test; Impe Dance Est - Wavetek 3001 Instruction Manual

PR OC EDURE 1 . Set
t
he . ίητιιτι mεηι controls as follows :
4.17 IMPEDA NCE
T
EST
EQ UIPMEN T
(81 0 1) 0 2 1 (131
4- 2 0
FRED VERN I ER CA L
Frequency selector
520,000 ΜΗτ
ΜΟΠΟ L Λ 71 ΟΝ MODE
FMxI
M
OD ULATIO N F RE D 1 kH z
M
OD U LATION F
M
;A M 3 kH z
OUTPU T VERN I ER Fu ll εω
OUTPU T Sι e p ΑΓ te ηιια t τιτ 1 10 ι 1 Βιη
2. Connect the equipment as shown in
F
igure 4-2.
3. Set the modulation meter to read FM
d
eviation at 520 MHz . Set the
RF input attenuation to 20 dB, the I F bandwidth to χ 400 kH z, th e meter
response to fast .
t
he function switch to 4 FM,
t
h e mete r range switch to 3 .
and the filter bandwidth to 50 Ητ - 15 kH z. Th e modu lation meter
sh ou l d read approxi m ately 3 kH z.
4, Cali brate the distortion analyzer and measure distortion . The distor
tion
s
hould be less than 4'y, . Record tile dist ιι rti οu on line. 45 of the PTR .
5- Set the meter range switch of th e modu lation meter to 300- Set t h e
MODULATION
M
OD E [υ FM x10.
6. Adjust tile
M
ODUL ATIO N FM/AM for α r
eading of 30 kHz deviation
on t he modulation mm ει .
7.
Calibrate t
h
e. distortion analyzer and
m
easure t he
d
istortion . The
distortion
s
h ould
b
e less than 2% .
R
ecord
t
h e
d
istortion on line 46 of
t
he PT R .
SPE CI F ICATIO N
50 ohms . VSWR 1 .2 at RF output levels
b
elow 0.1 VR M S.
MET HOD
The measurement is ma de with α
V
SWR b ri
d
ge and
t
he return loss is dis-
played on α spectr um analyzer . An RF signal f rom α signal ge nerator is
fad to the input of the
b
ri dge . Α reference level is establis hed by
s
horting
the
b
ri dge output port, The short is rep laced by t h e RF impedance of the
ίπ s τ rυ m οπι . The signal generator is tuned ιΙτrπιιgh ουτ its range and
t
he
ιe ιυιιι loss versus frequency is displayed,
PROCEDURE
1 . Set the instrume n t controls as follows:
FRE Π VERN IER
CA L
Frequency selector 520 .000 MH z
M
OD ULATIO N M OD E CW
M
OD UL ATIO N F R EO
N/A
M
OD ULATIO N FM/AM
NIA
OUTPUT VERNIER
+3 dB
OUTPU T Step Αττεπυαtοι -10 d
B
m
2 .
U
se the setup in Figu re 4 .5 . Connect the signal ge nerator to the input
port, the spectrum analyzer to t h e reflected Output
p
ort and
t
he coaxial
short to the d evice- u n
d
er-test
p
ort of the
V
S WR br i dge .