The Newport 1835-C is a multi-function optical power meter delivering precise measurements across DC, peak-to-peak, and pulse operating modes. It accepts interchangeable Newport sensor heads—from low-power semiconductor photodiodes to high-power thermopile and pyroelectric detectors—enabling optical power characterization from 100 femtowatts to 300 watts and integrated energy measurements from 35 nanojoules to 1 joule. Output readings display in watts, dBm, dB, joules, ergs, amperes, and volts on a 6-digit vacuum fluorescent display with analog bar graph and 10X zoom. The instrument integrates 2500-point data storage, programmable sampling up to 1 kHz, and recallable configurations for reproducible test setups. Digital communication via RS-232C and IEEE-488 (GPIB), combined with analog output and trigger control, supports both standalone operation and system integration.
Technical Specifications
• Measurement Types: Optical power (DC, peak-to-peak, pulse), integrated energy, wavelength (with compatible detectors)
• Power Range: 100 fW to 2 W (818 Series semiconductor); 10 mW to 300 W (818T thermopile); 35 nJ to 1 J energy (818J pyroelectric)
• Wavelength Coverage: 190 nm to 1800 nm (semiconductor); 0.19 µm to 11 µm (thermopile); 0.19 µm to 20 µm (pyroelectric)
• Display: 6-digit vacuum fluorescent with analog bar graph and 10X zoom
• Sampling: Up to 1 kHz single-channel; 20,000 count at ≤ 25 Hz; 4096 count at ≤ 1 kHz
• Sensitivity (Full-Scale): 2.5 nA to 2.5 mA current; 790 µV to 25 V voltage
• Resolution: 100 fA; 125 nV
• Bandwidth: DC to 1 MHz (−3 dB)
• Accuracy: DC ±0.1% typical; peak-to-peak ±1% typical; pulse ±1% typical; integration ±1% typical
• Data Storage: 2500-point buffer; 10 recallable configurations
• Analog Output: 0 to 2.5 V into 50 ohms
– Key Features
• Analog and digital filtering with moving statistics
• Programmable sample rates and trigger control with alarm levels
• Compact desktop form factor: 8.5 × 4 × 14 inches
– Compatibility & Integration
Works with Newport 818 Series (silicon, germanium, indium gallium arsenide), 818P/818T thermopile, and 818E/818J pyroelectric detector families. Calibration modules available for wavelength-specific accuracy at selected operating points.
