Test Procedures R&S SMU200A
1007.9845.82 1.36
E-12
FM Frequency Response
Test Method FFT Demodulation
Spectrum Measurement (see chapter "
Test Methodes")
Measurement Settings on DUT:
RF
On
Level 0 dBm
Frequency Modulation menu:
Source External
FM deviation 100 kHz.
Setting on the signal generator
:
f
or frequencies up to 300 kHz the internal LF generator of the signal
generator is used, >300 kHz the RF output. It is recommended to
use an AC voltmeter (Item 19 of table 1-2) to control the correct
input voltage.
- LFGen Voltage 0.707 V
- State ON
- RF level 10 dBm (equivalent to 1 V peak voltage).
Settings on R&S FSQ
:
U
p to fmod = 300 kHz settings for FFT Demodulation
fmod > 300 kHz settings for Spectrum Measurement.
Vary the signal generator frequency and measure the modulatio
n
dept
h.
The modulation frequency response is the difference between the
greatest and the smallest modulation depth.
Repeat the measurement with the internal modulation generator wi
th
t
he setting Source Internal.
Recommended settings LF in logarithmic steps,
4 steps per decade (1, 1.8, 3.2, 5.6). Start with 10 Hz only wit
h
dev
iation 100 kHz, start with 10 kHz with all others.
CF settings
20 MHz, 250 MHz, 500 MHz, 812 MHz, 940 MHz, 1067 MHz,
1194 MHz, 1321 MHz, 1484 MHz, 2200 MHz,
4000 MHz, 6000 MHz.
At CF 500 MHz, FM source external test with deviation settings from
5 kHz to 5 MHz in logarithmic steps (1, 2, 5 sequence).
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