The Rohde & Schwarz URE3 is a precision RMS voltmeter engineered for accurate voltage and frequency measurements spanning DC to 30 MHz. This instrument performs true RMS measurements on AC, AC+DC, and DC signals, alongside peak-value and frequency analysis. A patented rectifier circuit with microprocessor-controlled autocalibration delivers measurement repeatability critical for telecommunications, audio engineering, video systems, and calibration laboratory work.
Measurement capability extends from 50 µV to 300 V across AC and AC+DC ranges, with DC measurements to ±300 V. The instrument executes more than 30 measurements per second and includes a built-in frequency counter spanning 10 Hz to 30 MHz. Automatic frequency response correction, applied internally based on measured signal frequency, maintains accuracy across the full operating range. A zero function compensates inherent noise to enhance low-level measurement fidelity.
The URE3 offers switchable highpass and lowpass filters—with lowpass cutoff options at 20 kHz, 100 kHz, and 1 MHz—to optimize signal conditioning for specific measurement tasks. Input impedance is 1 MΩ shunted by 40 pF. The instrument supports a maximum crest factor of 7 at nominal range, with sensitivity better than 10 dB below nominal range. Range selection operates in AUTO, HOLD, or FIX modes.
Display options include a 4½-digit digital readout and an analog meter with selectable scaling. The URE3 accommodates commercial probes with automatic division factor consideration, simplifying probe-based measurements. Peak-value measurement capability eliminates tilt and overshoot artifacts. An optional IEC/IEEE bus interface enables integration into automated test systems alongside manual benchtop operation.
Technical Specifications
• Voltage Measurement: 50 µV to 300 V (AC/AC+DC); 0 to ±300 V (DC)
• Frequency Range: RMS 0.02 Hz to 30 MHz; Peak 10 Hz to 10 MHz; Counter 10 Hz to 30 MHz
• Input Impedance: 1 MΩ ∥ 40 pF
• Maximum Crest Factor: 7 at nominal range
• Measurement Speed: >30 measurements/s
• Display: 4½-digit digital; analog meter with selectable scales
• Filters: Highpass and lowpass (20 kHz, 100 kHz, 1 MHz cutoff)
– Key Features
• Patented rectifier circuit with microprocessor-controlled autocalibration
• Automatic frequency response error correction per instrument and range
• Zero function for noise compensation at low signal levels
• Peak measurement without tilt or overshoot
• Commercial probe support with automatic division factor
• Menu-guided operation
– Typical Applications
• Telecommunications system testing
• Audio engineering measurements
• Video system validation
• Electronics R&D and troubleshooting
• Calibration laboratory work
– Compatibility & Integration
• Optional IEC/IEEE bus interface for automated test setup integration
• Manual benchtop operation and programmed system control
