Atec Rohde-Schwarz-ESL Series - Manual (Page 11)

Version 02.00, March 2013
Rohde & Schwarz R&S ® ESL EMI Test Receiver 11
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
Recording time 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
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
Residual FM demodulation bandwidth ≤100 kHz, RMS,
RF input level ≥ (RF attenuation/dB –30) dBm
RF ≤ 1 GHz 150 Hz
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