Rohde and Schwarz RT-ZPR40 Power Rail Active Probe, 0 Hz to 4 GHz

The Rohde & Schwarz RT-ZPR40 is an active power rail probe designed for precision power integrity measurements across DC to 4.0 GHz bandwidth. It delivers high-fidelity capture of fast transient events and high-frequency noise on power rails while maintaining very low added noise - only 10% above oscilloscope baseline. The 1:1 attenuation ratio and 50 kΩ input impedance minimize circuit loading while accommodating DC offset voltages up to ±60 V.

Signal handling capacity reaches ±0.85 V with offset compensation to ±60 V, supporting non-destructive inputs to ±60 V DC or ±5 V AC peak.

Technical Specifications

• Bandwidth: DC to 4.0 GHz


• Attenuation Factor: 1:1


• Input Impedance: 50 kΩ


• Maximum Signal Voltage: ±0.85 V


• Offset Compensation Range: ±60 V


• Maximum Non-Destructive Input: ±60 V DC or ±5 V AC (peak)


• AC Coupling Low-Frequency Cutoff: 10 Hz


• Added Noise: 10% above oscilloscope noise floor


• ProbeMeter Dynamic Range: ±60 V


• ProbeMeter Accuracy: < 0.1 %

Key Features

• Integrated ProbeMeter displays DC voltage, ripple, noise, and settling transients directly on the oscilloscope display


• High impedance (50 kΩ) minimizes loading effects on measured circuits


• AC coupling capability with 10 Hz low-frequency cutoff for ripple and transient analysis


• Comprehensive accessory kit: ground leads with alligator clips, ground springs, IC caps, spring tips, micro SMD clip, flexible ground lead, and multiple probe tips for diverse board topologies

Typical Applications

• Power rail ripple and noise characterization


• Transient response measurement during load switching


• Power supply voltage tolerance verification


• High-frequency noise detection in presence of large DC offsets

Compatibility & Integration Connects via Rohde & Schwarz probe interface to compatible oscilloscopes including TM3000, RTA4000, MXO, RTE, RTO6, and RTP Series models. Operates from 0 to 40 °C. Includes 1 m SMA cable for accessory connections.