Test Procedures R&S SMB
1407.0806.82 1.40 E-5
Carrier Frequency Offset with FM
Test assembly See section "Standard Test Assembly for Analog Modulations",
page 1.3.
Measurement Settings on DUT:
RF On
L
evel 0 dBm
Frequency 1 GHz
Frequency Modulation menu:
State on
FM Source Internal
FM Mode Normal
FM deviation 1 MHz
LFGen Frequency 10 kHz
Settings on spectrum analyzer
AMPT / REF LEVEL 0 dBm
FREQ / CENTER 1 GHz
SPAN 10 kHz
MKR / SIGNAL COUNT / NEXT / CNT RESOL 10 Hz
Terminate the DUT External Modulation input with 50 V.and
execute the internal FM offset adjustment.
Execute a single sweep. Using MKRX / PEAK, read counted
marker frequency.
The offset is the difference between marker frequency and set
carrier frequency.
Repeat measurement with FM source external, coupling ac and dc
(2 measurements).
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