Atec Rohde-Schwarz_FSL Series - Manual (Page 13)

Version 09.00, December 2008 R&S ® FSL Spectrum Analyzer 13
R&S
®
FSL-K7 AM/FM/
φM measurement demodulator
Measurement of analog modulation signals
Demodulation bandwidth
100 Hz to 6.4 kHz, binary steps
12.5 kHz to 1.6 MHz, binary steps
3 MHz, 5 MHz, 8 MHz, 10 MHz, 18 MHz
Recording length maximum 512 ksample
demodulation bandwidth
100 Hz 3276.8 s
6.4 kHz 51.2 s
12.5 kHz 26.6 s
1.6 MHz 200 ms
3 MHz 100 ms
5 MHz 50 ms
8 MHz 25 ms
10 MHz 12.5 ms
Recording time
18 MHz 12.5 ms
Display frequency versus time (FM), amplitude versus time (AM), phase versus time ( φM),
RF power versus time, RF spectrum (FFT), AF spectrum (FFT),
table with numeric values for: modulation deviation (peak, RMS), modulation
frequency, carrier offset, carrier power (power of unmodulated carrier), THD, SINAD
AF (modulation frequency)
Range
9 MHz
max. 0.5 × demodulation bandwidth
Resolution 5 digits
Measurement uncertainty 0.1 %
AF filters
Lowpass 3 kHz, 15 kHz, 150 kHz,
5 %, 10 %, 25 % of demodulation
bandwidth
Highpass 50 Hz, 300 Hz
Deemphasis 25 µs, 50 µs, 75 µs, 750 µs
AM demodulation
Measurement range
modulation depth 0 % to 100 %
Modulation depth uncertainty AF
 1 MHz
<3 % of reading + residual AM
Residual AM demodulation bandwidth  200 kHz, RMS,
RF
 3 GHz, RF input level 
(RF attenuation/dB – 30) dBm
0.2 %
Distortion 10 Hz
 AF  100 kHz
0.3 %
FM rejection AF  1 MHz and
AF + deviation  0.5 × demodulation
bandwidth
typ. 1 % + residual AM
FM demodulation
Measurement range
frequency deviation
9 MHz
Deviation uncertainty AF  1 MHz and
AF + deviation  0.5 × demodulation
bandwidth
<3 % of reading + residual FM
demodulation bandwidth
 100 kHz,
RMS, RF input level

(RF attenuation/dB – 30) dBm
RF  1 GHz 150 Hz
Residual FM
RF = 3 GHz 200 Hz
Distortion 10 Hz  AF  100 kHz,
deviation < 400 kHz
0.3 %
AM rejection 100 Hz
 AF  1 kHz,
modulation depth 50 %
30 Hz