Operating Manual R&S SMIQ - Volume 1 - Rohde & Schwarz

Test ProceduresSMIQ5.3.11.2 Dynamic CharacteristicsTest assemblyMeasurementSee section "Test Assemblies", test assembly for pulse modulation On the dual-trace oscilloscope, simultaneously display the inputsignal from the pulse generator and the (downconverted) outputsignal with triggering on the input signal. Setting on pulse generator:- Squarewave pulse sequence with a frequency of approx. 100 kHz,TTL level Setting on SMIQ:- Pulse modulation, level depending on mixer used Vary the carrier frequency from 5 MHz to RF max . For recommendedsetting values see Table 5-2, at least * frequencies. For carrier frequencies > 50 MHz, use mixer and set an IF ofapprox. 50 MHz with the auxiliary generator. Evaluate the pulse-modulated RF signal on the oscilloscope. Rise time = time between 10% and 90% of RF amplitudeFall time = time between 90% and 10% of RF amplitudePulse delay = time between 50% of input pulse amplitudeand 50% of RF amplitude5.3.12 Frequency Modulation (Option SM-B5)5.3.12.1 FM Deviation SettingTest assemblyMeasurementSee section "Test Assemblies", standard test assembly for analogmodulations Settings on SMIQ:- RF 500 MHz- Level 0 dBm- Select INT in the menu ANALOG MOD/FM/FM1 SOURCE.- Modulation frequency 1 kHz- Recommended test deviations 300 Hz,1, 3, 10, 30, 100, 250, 500 kHz Read the FM deviation from the modulation analyzer. Repeat test at a deviation of 50 kHz and carrier frequencies of 150,300, 600, 1200, 2200, 3500, 4400, 5600, 6400 MHz.5.3.12.2 FM DistortionTest assemblyMeasurementSee section "Test Assemblies", standard test assembly for analogmodulations Settings on SMIQ:- Carrier frequencies 100, 1200 and 3301 MHz– Half maximum deviation each- Level 0 dBm- Select INT in the menu ANALOG MOD/FM/FM1 SOURCE.- Modulation frequency 1 kHz Read the distortion from the modulation analyzer.1125.5555.03 5.34E-9