R&S SMB Test Procedures
1407.0806.82 1.43 E-5
PhiM Frequency Response
Test method FFT Demodulation (see chapter "Test ").
Measurement
Settings on DUT:
RF On
Level 0 dBm
Phase Modulation menu:
PhiM Source External
PhiM Ext Coupling DC
PhiM Mode Normal
PhiM deviation: 2 rad
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
(Item 14 of (Table 1-1).
- 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
PhiM Ext Coupling AC
for test frequency 23 MHz.
Repeat the measurement with changing the settings to
PhiM 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
PhiM Ext Coupling AC
PhiM Mode Low Noise
PhiM deviation 5 rad
at test frequency 500 MHz. LF sweep from 1 kHz to 100 kHz
Repeat the measurement with changing the settings to
PhiM Ext Coupling AC
PhiM Mode High Deviation
PhiM deviation 20 rad
at test frequency 500 MHz. LF sweep from 1 kHz to 100 kHz
Repeat the measurement with changing the settings to
PhiM Source Internal
PhiM Mode Normal
PhiM deviation 2 rad
at test frequency 500 MHz. LF sweep from 1 kHz to 500 kHz
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