The MKS Instruments/Newport 840-C is a handheld optical power meter engineered for precise DC and AC peak-to-peak power measurements across low to moderate power ranges. Built on dual-microprocessor architecture, the unit delivers sensitivity from 100 pW to 2 W and accommodates Newport’s 818 Series detectors via in-line calibration modules. The backlit 4-digit LCD and integrated audio indicator enable operation in variable lighting conditions and hands-free signal optimization. Analog output facilitates integration with external instrumentation.
Technical Specifications
• Measurement Modes: DC and AC peak-to-peak power
• Power Sensitivity: 100 pW to 2 W (-70 dBm to +33 dBm)
• Wavelength Resolution: 1 nm steps (user-configurable)
• Readout Formats: Linear, dB, dBm, and linear ratio
• Display: 4-digit backlit LCD
• Sampling Rate: 2.5 readings/s (typical)
• Gain Ranges: 6 decades (DC), 4 decades (AC peak-to-peak)
• Setting Time: 2 seconds to ±1 digit (fast mode)
• Background Subtraction: Ambient light interference reduction
• Digital Averaging: Signal-to-noise ratio improvement
• Analog Output: 0–1 V into 1 MΩ; ±(2.5% + 15 mV) @ 100 nA; ±(2% + 10 mV) @ 1 µA–5 mA
• Input Voltage Burden: 5 µV (zero), 10 µV (full range), 100 µV (5 mA range)
• Input Noise: ±1 A-D count or better
• Power Source: Rechargeable Ni-Cd batteries or AC adapter/charger
• Battery Life: 18 hours (backlight on)
– Key Features
• Dual-microprocessor design for sensitive measurements
• Quick detector changeover with modular calibration approach
• Audio indicator for signal tuning without visual monitoring
• Full-spectrum sensor calibration capability
– Typical Applications
Optical power verification, detector characterization, and laser system performance validation across silicon, germanium, and indium gallium arsenide wavelength bands.
– Compatibility & Integration
Fully compatible with Newport 818 Series Low-Power Si, Ge, and InGaAs detectors. Also supports 918D and 918L Series detectors via the 818P-DIN adapter. Detector-specific calibration leverages in-line calibration modules (e.g., 818-xx/CM). 8-pin sub-mini DIN input connector.
Physical: 7.2 × 3.0 × 1.5 inches (183 × 76 × 38 mm); 1.1 lb (500 g); flame-resistant ABS enclosure.
