Fm Audio Distortion Measurement - HP 8920A Application Handbook

FM Transmitters

FM Audio Distortion Measurement

POWER
OFF ON
50Ω COXIAL
CABLE
ANTENNA
(RF OUT)
74
Description
This procedure is used to measure an FM Transmitter's audio frequency
harmonic distortion level. FM reference is
ANSI/EIA-RS-152-C, RS-316-B.
TX TEST
RF IN/OUT DUPLEX OUT ANT IN
M AX POWER 60 W
!
! M AX POWE R 20 0 mW
CONTINUOUS
ATTENUATOR (OPTIONAL)
1
TRANSMITTER UNDER TEST
3 Knob Data Entry
SCREEN CONTROL
MSSG HELP CONFIG HOLD PRINT
RX TX DUPLEX PREV TESTS
USER DATA FUNCTIONS
k1'
REF SET METER AVG
INCR INCR INCR X10
7
k1
: 10 SET
k2'
LO LIM IT HI LIMIT
k2
4
k3'
CURSOR CONTROL
k3
ASSIGN 1
k4
RELEASE
0
PUSH TO SELECT
k5
YES
ON/OFF
SHIFT CANCEL
MIC/ACC VOLUME SQUELCH AUDIO OUT
2
Keys
INSTRUMENT STATE
ADRS SAVE
MEAS
LOCAL RECALL PRESET
RESET
DATA
8 9
ENTER
dB
GHz
5 6
dBm
%
MHz
2 3
V
s
kHz
+ _
mV
Ω
NO ms
ppm % Hz
µV
W dBµV
M EMORY
CARD
AUDIO IN
HI LO
M AX MAX
! !
12 v Pk 42 v Pk
SHEILDED
AUDIO CABLE
MICROPHONE
(AUDIO INPUT)