Rohde and Schwarz RT-ZD40 Active Probe, Differential, 0 Hz to 4 GHz

The Rohde & Schwarz RT-ZD40 is an active differential probe engineered for precision measurement of high-frequency differential signals from DC to 4.5 GHz. It delivers high input impedance (1 MΩ || 0.4 pF) and low input capacitance to minimize circuit loading while maintaining excellent signal fidelity across demanding applications in signal integrity, high-speed digital design, and power electronics.

Technical Specifications

• Bandwidth: DC to 4.5 GHz


• Attenuation Factor: 10:1


• Input Impedance (Differential): 1 MΩ || 0.4 pF


• Maximum Input Voltage (Between Signal Sockets): ±5 V with ±5 V offset compensation


• Maximum Input Voltage (Each Signal Socket to Ground): ±8 V with ±22 V offset compensation


• Maximum Non-Destructive Input Voltage: ±30 V


• Dynamic Range (Differential Input): ±5 V with ±5 V offset capability


• Operating Voltage Window (Each Pin to GND): ±8 V with ±22 V common mode offset capability


• ProbeMeter Measurement Error: <0.1 %


• Cable Length: 1.2 m

Key Features

• High common-mode rejection suppresses interference in high-clock-rate systems


• Very low added noise for error-free broadband signal transmission


• Integrated high-precision DC voltmeter with ProbeMeter functionality


• Temperature-stable performance with extremely low zero and gain drift


• Variable pitch width for connection to diverse devices under test


• Integrated micro button for instrument control

Typical Applications

• Signal integrity analysis on high-speed digital designs


• Power electronics measurements requiring differential coupling


• Common-mode noise rejection in broadband signal environments


• Non-invasive probing where circuit loading must be minimized

Compatibility & Integration The probe connects via Rohde & Schwarz probe interface using a male precision 7 mm BNC connector and six pogo pins for supply voltage, analog signal transmission, and digital data. Direct integration with compatible Rohde & Schwarz oscilloscopes provides software-controlled operation. An optional adapter enables use with base units lacking the native probe interface. Supported oscilloscopes are detailed in the product datasheet.