Fluke 8505A – Digital Multimeter 6.5 Digit

The Fluke 8505A is a 6.5-digit digital multimeter engineered for high-precision measurements in R&D, manufacturing, and service environments. Delivering 100 nV resolution on its lowest DC voltage range and 5 ppm accuracy on the 10V range, this microprocessor-controlled instrument combines exceptional stability with flexible remote and front-panel control. Its modular construction and bus architecture enable custom configuration through optional converters and current shunts, while an averaging mode extends resolution to 7.5 digits on the 10V range and improves measurement stability across all functions.

– Technical Specifications

Resolution & Accuracy
• 6.5-digit standard display; 7.5 digits on 10V range with averaging
• DC voltage accuracy: 5 ppm on 10V range, 6 ppm with averaging
• Zero stability: less than 5 µV over 90 days (post four-hour warm-up)
• Two-hour warm-up required; specifications valid 18°C to 28°C

Measurement Ranges
• DC voltage: Five ranges with 100 nV resolution minimum
• Maximum input: ±1200V DC or 1000V RMS AC to 60 Hz; 1400V peak above 60 Hz
• Maximum common-mode rate of voltage rise: 1000V/µsec

Digitizing Performance
• Line synchronous: 4 ms to 9 minutes 6 seconds (2 to 217 samples; 60 Hz basis)
• Line asynchronous: 2 ms minimum (3-byte binary mode, DC zero offset disabled)
• Selectable in 18 binary steps

Power & Environment
• Input: 100V, 120V, 220V, or 240V ac (±10%); 47–63 Hz standard
• Consumption: 12 watts standard; 24 watts with options
• MIL-T-28800 Type III, Class 5, Style E compliance

– Key Features

• Microprocessor control with full front-panel and remote interface programming
• Modular construction supports AC voltage converters, resistance modules, and current shunts
• Averaging mode enhances stability and display resolution across all measurement functions
• Optional IEEE 488-1975 interface for system integration

– Typical Applications

Precision voltage and resistance measurement, calibration labs, component characterization, and automated test systems requiring sub-microvolt stability and extended temperature hold.

– Compatibility & Integration

Optional IEEE 488 interface enables integration into automated test setups. AC voltage measurement, resistance, and current capabilities require corresponding optional modules (converters, shunts).