Fm Audio Distortion Measurement - HP 8920A Application Handbook

FM Receivers

FM Audio Distortion Measurement

POWER
OFF ON
!
50Ω COXIAL
CABLE
ANTENNA (RF INPUT)
108
Description
This procedure is used to measure an FM Receiver's audio distortion.
Distortion is measured at full rated audio output and 17 dB below full
rated audio output. Measurement is read directly from the HP 8920A
screen. The FM reference is ANSI/EIA/TIA-204D.
RX TEST
RF IN/OUT DUPLEX OUT ANT IN
M AX POWER 60 W
!
MAX POWER 20 0 mW
CONTINUOUS
1
RECEIVER UNDER TEST
3 Knob Data Entry
Keys
SCREEN CONTROL
MSSG HELP CONFIG HOLD PRINT ADRS
RX TX DUPLEX PREV TESTS LOCAL
USER DATA FUNCTIONS
k1' REF SET M ETER AVG
INCR INCR INCR X10
7
k1
: 10 SET
k2'
LO LIMIT HI LIMIT
k2
4
k3'
CURSOR CONTROL
k3
1
ASSIGN
k4
RELEASE
0
PUSH TO SELECT
k5
YES
ON/OFF
SHIFT CANCEL
MIC/ACC VOLUME SQUELCH AUDIO OUT
M AX
!
1 2 v Pk
TEST LOAD
2
INSTRUMENT STATE
SAVE
MEAS
RECALL PRESET
RESET
DATA
8 9
ENTER
dB
GHz
5 6
dBm
%
M Hz
2 3
V
s
kHz
+ _
mV
Ω
NO ms
ppm % Hz
µV
W dBµV
M EMORY
CARD
AUDIO IN
HI LO
M AX
!
42 v Pk
SPEAKER
(AUDIO
+
INPUT)
GND