Test Procedures R&S SMB
1407.0806.82 1.38 E-5
FM Frequency Response
Test Method FFT Demodulation (see chapter "Test ")
M
easurement Settings on DUT:
RF On
Level 0 dBm
Frequency Modulation menu:
FM Source External
FM Ext Coupling DC
FM Mode Normal
FM deviation: 1 MHz
Setting on the signal generator:
The internal LF generator of the signal generator delivers the
modulation signal to the external modulation input of the DUT. The
level of the modulation signal is controlled by use of an AC voltmeter.
- LFGen Voltage 1 V peak
- State ON
Settings on R&S FSQ:
FFT Demodulation
Vary the signal generator frequency and measure the modulation
depth.
The modulation frequency response is the factor between the
greatest and the smallest modulation depth.
Recommended settings LF in logarithmic steps,
3 steps per decade (1, 2, 5) from 10 Hz to 500 kHz
Perform the measurement for test frequency 23 MHz.
Repeat the measurement with changing the settings to
FM Ext Coupling AC
for test frequency 23 MHz.
Repeat the measurement with changing the settings to
FM Ext Coupling AC
for test frequencies: 375.1 MHz, 500 MHz, 625 MHz, 750 MHz. LF
sweep from 1 kHz to 500 kHz
Repeat the measurement with changing the settings to
FM Ext Coupling AC
FM Mode Low Noise
FM deviation 500 kHz
at test frequency 500 MHz. LF sweep from 1 kHz to 100 kHz
Repeat the measurement with changing the settings to
FM Ext Coupling AC
FM Mode High Deviation
FM deviation 2 MHz
at test frequency 500 MHz. LF sweep from 1 kHz to 100 kHz
Repeat the measurement with changing the settings to
FM Source Internal
FM Mode Normal
FM deviation 1 MHz
at test frequency 500 MHz. LF sweep from 1 kHz to 500 kHz
To Next Page
Loading...
