The Rohde & Schwarz URE3 (350.5315.03) is a precision RMS/Peak Voltmeter engineered for accurate voltage and frequency measurements across demanding laboratory, field, and automated testing environments. It delivers true RMS measurements for AC and AC+DC signals, peak value detection, and DC voltage characterization with microprocessor-controlled autocalibration and automatic frequency response correction. The instrument’s patented rectifier circuit and nonvolatile correction memory provide unmatched measurement accuracy across all ranges and frequencies.
Technical Specifications
Measurement Functions
• True RMS value measurement for AC and AC+DC voltages
• Peak value measurement (positive, negative, peak-to-peak)
• DC voltage measurement
• Frequency measurement to 30 MHz
Frequency Range
• RMS: 0.02 Hz to 30 MHz
• Peak: 10 Hz to 10 MHz
• Rear input: 0.1 Hz to 30 MHz
Voltage Measurement Range
• DC: 0 to ±300 V
• AC: 50 µV to 300 V (AC + DC)
• AC volts: 50 µV to 300 V
• DC volts: 0 to 300 V
Range Selection
• AUTO, HOLD, FIX modes
Input Characteristics
• Input Impedance: 1 MΩ shunted by 40 pF
• Low input capacitance design
Performance Specifications
• Maximum Crest Factor: 7 at nominal range
• Sensitivity: better than 10 dB below nominal range
• Measurement speed: >30 measurements/s (fast mode)
Correction & Calibration
• Automatic frequency response error correction determined per instrument and range
• Microprocessor-controlled autocalibration
• Zero function compensates noise voltages for enhanced low-level accuracy
• Measured frequency value enables internal frequency response correction at higher frequencies
Filtering
• Highpass and lowpass filters for hum and noise suppression
• Lowpass filters: 20 kHz, 100 kHz, and 1 MHz cutoff frequencies
• 1 MHz Bessel lowpass filter with optimized overshoot for peak-value accuracy
Display
• 4½-digit digital display
• Analog bargraph with selectable scale and auto-track or manual adjustment
– Compatibility & Integration
IEC bus (IEEE 488) interface enables full remote control. Optional IN/OUT module provides dual-channel analog output, ready output, and trigger input for integrated test systems.
