Rohde & Schwarz ESH3 9KHz-30MHz Measuring Receiver

The Rohde & Schwarz ESH3 is a measuring receiver engineered for precision signal analysis and interference characterization across 9 kHz to 30 MHz. This instrument delivers high sensitivity, excellent selectivity, and wide dynamic range - essential for EMC testing, signal monitoring, and radio reconnaissance. The ESH3 demodulates AM double-sideband, single-sideband, pulse modulated, and FM signals while measuring sinusoidal and impulsive interference with measurement range of -30 to +137 dBµV.

Operating as a high-precision selective voltmeter, it requires no additional accessories for basic operation.

Technical Specifications

Frequency coverage spans 9 kHz to 30 MHz with measurement range -30 to +137 dBµV. The instrument offers selectable low-noise or low-distortion measurement modes. Automatic linearity testing distinguishes inherent non-linearity from device-under-test non-linearity. A calibration generator produces 80 dBµV ±0.6 dB into 500 Ω at receiver center frequency, supporting attenuation measurements to 110 dB and gain measurements to 57 dB. With the optional ESH3-Z2 Pulse Limiter installed, the receiver handles 1 W continuous power and 100 mWs pulse power (6 µs duration) at 10 dB insertion loss.

Key Features

• 75 MHz broadband IF output enables integration with panoramic displays and spectrum monitors


• IEC 625-1 (IEEE 488) GPIB interface for remote control and automated test sequences


• Talk-Only mode for direct printer output without a controller


• Device Clear and Device Trigger functions for synchronized measurement automation


• Local Lockout disables front panel during automatic test runs

Typical Applications EMC testing and compliance verification; signal monitoring in complex RF environments; radio reconnaissance and interference analysis; amplifier and filter frequency response characterization; disturbance voltage measurement in low-impedance supply networks (with ESH3-Z6 V-Network accessory).

Compatibility & Integration The ESH3 interfaces with IEC/IEEE bus-compatible test systems. Optional V-Network (ESH3-Z6) extends capability to 0.1 MHz–200 MHz for supply network measurements. The ESH3-Z2 Pulse Limiter accessory protects the receiver input during high-power pulse testing.