Rohde and Schwarz FSH-Z18 Power Sensor, 10 MHz to 18 GHz

The Rohde & Schwarz FSH-Z18 is an average power sensor that transforms the FSH series handheld spectrum analyzer into a high-precision RF power meter. This sensor attachment delivers accurate power measurements across 10 MHz to 18 GHz, enabling specialized measurement tasks with true RMS detection that accommodates modulated and complex waveforms. The FSH-Z18 operates via direct connection to the FSH analyzer's dedicated interface, drawing power and control signals through a 1.5 m cable.

Technical Specifications

• Frequency Range: 10 MHz to 18 GHz


• Measurement Range: −67 dBm to +23 dBm


• Maximum Average Power: 200 mW or 400 mW (+26 dBm)


• Maximum Peak Power: 1 W (+30 dBm)


• True RMS Detection: Measures signal RMS value independent of waveform, minimizing errors with modulated signals


• Signal Weighting (Average Power): Harmonic effect 0.5% (0.02 dB) at 20 dB harmonic ratio; modulation effect 1.5% (0.07 dB) for continuous digital modulation


• Absolute Measurement Uncertainty (Sine Signals, Zero Offset Removed): 2.5% (0.11 dB) from 10 MHz to 8 GHz; 4.5% (0.19 dB) from 8 GHz to 18 GHz


• Zero Offset: 150 pW post-zeroing


• VSWR: 10 MHz–30 MHz <1.15; 30 MHz–2.4 GHz <1.13; 2.4 GHz–8 GHz <1.20; 8 GHz–18 GHz <1.25


• Physical Dimensions: 48 mm × 31 mm × 170 mm


• Cable Length: 1.5 m


• Weight: 0.3 kg

Key Features

• True RMS measurement accommodates complex and modulated signals


• Low zero offset of 150 pW ensures high measurement repeatability


• Compact form factor at 0.3 kg for field-portable operation


• Controlled and powered through FSH analyzer's dedicated interface - no external power supply required

Typical Applications

• RF power verification across cellular, microwave, and millimeter-wave bands


• Modulated signal power characterization in development and field testing


• Harmonic and distortion analysis in signal conditioning systems

Compatibility & Integration The FSH-Z18 integrates exclusively with Rohde & Schwarz FSH series handheld spectrum analyzers. Calibration updates require the R&S NRVC Calibration Kit with Recal software for memory-based adjustment.