The Wavetek 4920M is an RMS AC voltage measurement standard engineered for precision calibration and electrical testing in laboratory environments. It operates as a self-contained system requiring no external reference instrumentation, delivering accuracies as tight as ±30ppm in high accuracy mode and ±14ppm in AC/DC transfer mode. The instrument provides three distinct measurement modes—High Accuracy, Wide Band, and AC/DC Transfer—to accommodate diverse testing requirements across frequency spans from 1Hz to 20MHz.
Technical Specifications
Measurement Modes & Ranges
• High Accuracy Mode: 100mV to 1100V across eight ranges; 10Hz to 1MHz; ±30ppm (1 year)
• Wide Band Mode: 100mV to 3.5V; 10Hz to 20MHz; ±1000ppm (1 year)
• AC/DC Transfer Mode: ±14ppm total uncertainty (1 year, ±5°C)
• Standalone Measurement Mode: ±28ppm total uncertainty (1 year, ±5°C)
Performance Characteristics
• Display Resolution: Selectable 5 to 7 digits
• Noise Uncertainty: Better than 0.5ppm RMS
• Input VSWR: Less than 1.02:1 at 50 Ohms
• Measurement Period: 2.5 seconds including settling time
• Operating Range: 30% to 110% of nominal range value
Environmental Specifications
• Operating Temperature: 0°C to +50°C
• Storage Temperature: -40°C to +70°C
• Line Supply: 100V to 130V or 200V to 260V, 47Hz to 63Hz
• Power Consumption: 37VA
– Key Features
• Fully IEEE-488.2 programmable with RS-232 and GPIB interfaces
• Autocal function enables external calibration of all ranges from front panel without cover removal
• Comprehensive self-tests: operational, diagnostic, display, and front panel key validation
• Optional millivolt ranges (3mV to 100mV) and wideband module to 50MHz
• Compact 19″ W × 3.5″ H × 15″ D footprint; 15 lbs (6.8 kg)
• Designed to UL1244 and IEC 348 safety standards
– Typical Applications
Calibration laboratories, AC voltage measurement standards, high-precision electrical testing, AC/DC thermal transfer standard replacement applications.
– Compatibility & Integration
Fully programmable via IEEE-488.2 interface. RS-232 and GPIB connectivity enable integration into automated test systems and calibration management networks.
