The Newport 835 Optical Power Meter delivers precise optical power measurements across laboratory and field environments. Its dual-display architecture combines a 4.5-digit digital readout with a 50-segment analog backlit LCD, providing flexibility for diverse measurement workflows. The instrument autoranges from 2 nW to 2 mW full scale with approximately 250 ms settling time per range, while linear and logarithmic display modes accommodate different analysis requirements. Digital wavelength response compensation and reference mode functionality enable ratio-based power monitoring relative to stored baselines.
Technical Specifications
Display & Measurement
• 4.5-digit digital display with 50-segment analog backlit LCD
• Autoranging: 2 nW to 2 mW full scale
• Manual and automatic ranging modes; autoranging time ~250 ms per range (average)
• Linear and logarithmic display modes
• Reference mode for power ratio measurement
• Settling time to within 2 counts on fixed range: <1 second
• Conversion period: 170 ms
Accuracy & Performance
• Repeatability: <±0.01 dB typical
• Polarization dependent response: ±0.006 dB typical
• Temperature coefficient: +(0.1 × applicable accuracy specification) per °C (0–18°C and 28–50°C)
Analog Output
• Nonlinearity: <0.1% full scale
• Gain accuracy: ±1%
• Output impedance: 1000 Ω
• Maximum common mode voltage: 30 V rms (DC to 60 Hz sine wave)
Power & Physical
• Input: 105-125 V or 210-250 V (switch-selected), 50-60 Hz, 12 VA
• Optional 5-hour battery pack (Model 835-BAT)
• Dimensions: 216 mm W × 89 mm H × 267 mm D
• Weight: 2.1 kg
– Key Features
• Compatible with individually calibrated Silicon and Germanium detectors
• Detectors support 400–1100 nm (Silicon) and extended ranges with Germanium options
• Optional IEEE-488 (GPIB) interface for automated data acquisition
• Analog voltage output for recorder and closed-loop control integration
– Compatibility & Integration
Works with Newport's 818-SL Silicon Photosensor (400–1100 nm) and 818-UV Silicon Photodiode. Extended wavelength coverage available with Germanium detector options.
