Compare Model Drawings, CAD & Specs Availability Price
Virtual Power Meter, Optical Power and Energy, USB
4 Weeks
4 Weeks


  • Number of Channels
  • Compatible Detectors
    818 and 918D series photodiode detectors, 919P, PEPS, 919E, LIAD
  • Communication Interfaces
    USB (cable included)
  • Analog Output
    0-1 Volt with 0.3mV (0.03%) resolution. 100 ohms impedance
  • Accuracy
    ±0.25% ±20pA for thermopiles and photodiodes ±0.25% for pyroelectrics
  • Analog Input Range
    15nA - 1.5mA full scale in 16 ranges for thermopiles and photodiodes 0 - 6V full scale for pyroelectrics
  • Dynamic Range
    9 decades (1:109)
  • Sampling Rate
    15 Hz (photodiode and thermopile), 10 kHz (pyroelectric)
  • Resolution
    18 bits plus sign for thermopiles and photodiodes 12 bits no sign (0.025% resolution) for pyroelectrics
  • Noise
    500nV or 1.5pA + 0.0015% of input range @3Hz for thermopiles and photodiodes 2mV for pyroelectrics
  • Dimensions
    68 x 117 x 32 mm
  • Power Requirements
    USB powered
  • Operating Temperature
    15°C to 35°C, <70% RH, non-condensing
  • Storage Temperature
    0°C to 50°C, <90% RH
  • CE Certified
  • RoHS
  • Weight


Ideal for Industrial Automation and Production

The all new 844-PE-USB Power & Energy Meter utilizes a PC as a powerful virtual power meter control system – multiple power meters can be connected to a single control computer. When the equipment space is tight or you need to control multiple power meter channels, the small size and simple interface of the 844-PE-USB is an ideal solution for system integration and automation. It not only has a USB output, but it also has a 0 - 1 V analog output. Installation of the application is simple and takes care of the USB driver installation.

PMManager™ Application Software

PMManager™ is a powerful application software controlling and taking measurement data. It turns a PC into a laser power multi-channel analysis workstation. The PMManager software features include: extensive graphic display of data, advanced measurement processing, data logging for future review, printing of graphs and data, and the ability to connect additional devices during active measurements. The PMManager software package includes the latest PMManager user manual, the COM object manual, the available user command lists, and automation examples written in various programming languages. Please see below or the PMManager Tutorial for more details regarding its capabilities.

Directly Access All Detector Parameters

All detector parameters are directly accessible from PMManager. Major parameters are available on the detector information window, and further functions are available by clicking 'Functions' button.

Extensive Graphic Displays

Various graphics displays are available in PMManager such as Line Plot, Histogram, Bar chart, and Simulated Analog Needle. Multiple data sets on one graph or separate graphs on the same screen are possible.

Data Logging for Future Review

  • Can be displayed graphically or saved in text format 
  • Log data based on the time interval or on the number of data points 
  • Easily exported to an Excel spreadsheet

COM Object

The PMManager software package also includes a COM object, which allows system integrators to integrate the measurement expertise of Newport equipment with in-house legacy analysis packages.

Demo client applications in VB.NET 2010, VC#.NET 2010, MatLab, and LabVIEW 2013 are provided with the PMManager installation and can be found in C:\Program Files\Newport\PMManager 3.xx\Automation Examples\Com object. A console application is provided as well.

Advanced Measurement Processing

  • Power/Energy Density, Scale Factor, Normalize against a reference 
  • Multi-channel comparisons 
  • User defined mathematical equations: channels A/B, (A-B)/C etc. 
  • Log every point at up to 10 kHz with Pyro sensors in binary mode
  • Log every point at up to 1 kHz with Pyro sensors in ASCII mode
  • Position & size measurement with PEPS sensors

Calibration Report Included

Newport certifies calibration performed using standards traceable to the National Institute of Standards and Technology (NIST) and other recognized national standards laboratories. Included with your new instrument is a comprehensive calibration report. Newport also recommends recalibration every 12 months.

Regarding Legacy 841-P-USB and 842-E-USB

Please note that the new 844-PE-USB employs a completely new design and it is not compatible with the legacy 841-P-USB and 842-E-USB. However, 844-PE-USB and 841-PE-USB are compatible.