R&S FSQ Signal Analyzer - Rohde & Schwarz

R&S FSQ Getting Started
2 Getting Started
2.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.2
2.2 Measuring the Spectrums of Complex Signals . . . . . . . . . . . . . . . . . . . . . 2.3
2.2.1 Intermodulation Measurements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.3
2.2.1.1Measurement Example – Measuring the R&S FSQ’s Intrinsic
Intermodulation Distance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.5
2.3 Measuring Signals in the Vicinity of Noise . . . . . . . . . . . . . . . . . . . . . . . . . 2.9
2.3.0.1Measurement Example – Measuring the Level of the Internal
Reference Generator at Low S/N Ratios . . . . . . . . . . . . . . . . . . . . . . . . . . 2.12
2.4 Noise Measurements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.17
2.4.1 Measuring Noise Power Density . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.17
2.4.1.1Measurement Example – Measuring the Intrinsic Noise Power
Density of the R&S FSQ at 1 GHz and Calculating the R&S FSQ’s
Noise Figure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.17
2.4.2 Measurement of Noise Power within a Transmission Channel . . . . . . . 2.20
2.4.2.1Measurement Example – Measuring the Intrinsic Noise of the
R&S FSQ at 1 GHz in a 1.23 MHz Channel Bandwidth with the
Channel Power Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.20
2.4.3 Measuring Phase Noise . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.25
2.4.3.1Measurement Example – Measuring the Phase Noise of a
Signal Generator at a Carrier Offset of 10 kHz . . . . . . . . . . . . . . . . . . . . . 2.25
2.5 Measurements on Modulated Signals . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.27
2.5.1 Measurements on AM Signals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.27
2.5.1.1Measurement Example 1 – Displaying the AF of an AM Signal
in the Time Domain . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.27
2.5.1.2Measurement Example 2 – Measuring the Modulation Depth of
an AM Carrier in the Frequency Domain . . . . . . . . . . . . . . . . . . . . . . . . . . 2.29
2.5.2 Measurements on FM Signals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.30
2.5.2.1Measurement Example – Displaying the AF of an FM Carrier . . . . 2.31
2.5.3 Measuring Channel Power and Adjacent Channel Power . . . . . . . . . . 2.33
2.5.3.1Measurement Example 1 – ACPR Measurement on an IS95
CDMA Signal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.34
2.5.3.2Measurement Example 2 – Measuring the Adjacent Channel
Power of an IS136 TDMA Signal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.39
2.5.3.3Measurement Example 3 – Measuring the Modulation Spectrum
in Burst Mode with the Gated Sweep Function . . . . . . . . . . . . . . . . . . . . . 2.42
2.5.3.4Measurement Example 4 – Measuring the Transient Spectrum
in Burst Mode with the Fast ACP function . . . . . . . . . . . . . . . . . . . . . . . . . 2.44
2.5.3.5Measurement Example 5 – Measuring the Adjacent Channel
Power of a W-CDMA Uplink Signal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.47
2.5.4 Amplitude Distribution Measurements . . . . . . . . . . . . . . . . . . . . . . . . . . 2.51
2.5.4.1Measurement Example – Measuring the APD and CCDF of
White Noise Generated by the R&S FSQ . . . . . . . . . . . . . . . . . . . . . . . . . 2.51
Operating Manual 1313.9681.12 - 01 2.1