840-C Newport Optical Meter


The 840-C is an optical meter from Newport. Engineers use optical signal generators when they want to transmit optical signals during an electronic equipment test. An optical meter is an instrument used to test and measure optical signals.

Additional Features:

  • Power and precision typical of a benchtop meter
  • Includes both DC and AC peak-to-peak measurement modes
  • Power sensitivity from 100 pW to 2 W (-70 to +33 dBm)
  • Wavelength and range settings
  • Linear, dB, dBm and linear ratio readouts
  • Background subtraction and digital averaging
  • Wavelength selection in 1 nm steps
  • Audible tone for no-look tuning
  • Rechargeable batteries for full portability
  • Most recent operating parameters are saved when unit is turned off


  • Display Type: 4-digit LCD w/ backlight
  • Sampling Rate (Hz): 2.5
  • Gain Ranges: 6 decades, DC; 4 decades, AC Pk-Pk
  • Full Scale Readings, Low-Power Detector: 100 nA–5 mA
  • DC Accuracy, 100 nA range, full scale: ± (0.5% + 50 pA)
  • DC Accuracy, 1 µA to 5 mA range, full scale: ± (0.25% + offset)
  • Peak-to-Peak Accuracy, 50 Hz to 1 kHz: Squarewave ±5%, Sinewave ±1%
  • Peak-to-Peak Accuracy, 1 kHz to 2 kHz: Squarewave ±1%, Sinewave ±2%
  • Peak-to-Peak Accuracy, 2 kHz to 5 kHz: Squarewave ±2%, Sinewave ±5%
  • Analog Output Accuracy, 100 nA range: ± (2.5% + 15 mV)
  • Analog Output Accuracy, 1 µA to 5 mA range: ± (2% + 10 mV)
  • Analog Output: BNC, 0–1 V into 1 MΩ
  • Temperature Coefficient: 0.1 x Accuracy/°C
  • Battery Life: 18 hours (backlight on)
  • Battery: Ni-Cd rechargeable
  • Wall Power: AC adaptor/Charger
  • Dimensions (H x W x D) (in.) (mm): 7.2 (183) x 3.0 (76) x 1.5 (38)
  • Operating Temperature: 0°C to 50°C, <80% RH
  • Storage Temperature Range: -25°C to 60°C, <90% RH

The Newport Model 840-C hand-held optical power meter is fully compatible with all of Newport’s 818 Series Low-Power Si, Ge and InGaAs detectors. Detectors connect to the power meter through an in-line calibration module that is dedicated to each detector. These detachable modules provide the Model 840-C with calibration and operating information specific to the assigned detector. Various detector accessories allow for free-space, as well as for fiber coupled power measurements. DC and AC peak-to-peak power measurements can be displayed in units of W and dBm on the instrument’s 4-digit, backlit LCD.

The 840-C is compatible with Newport’s Ge, Si and InGaAs detectors, allowing both free-space and fiber pigtailed measurements in the 200–1800 nm range. When using 818 Series detectors with the 840-C, a calibration module needs to be attached to the detector (818-xx/CM), assuring the correct reading at any pre-selected wavelength. Newport's new 918D and 918L Series detectors can also be used with the 840-C, in combination with the 818P-DIN adapter.

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