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Dual-Channel Benchtop Power/Energy Meter Console


Optical Power and Energy Meter, Dual-Channel Benchtop Console

  • Power and Energy Measurements for Free Space and Fiber
  • Large 240 x 128 Pixel Graphics Display, USB 2.0 Interface
  • Wide Array of Mathematical Functions
  • Compatible with Over 25 Sensors


  • Dual-Channel Power and Energy Meter Benchtop Console
  • Over 25 Compatible Sensors
  • Large Graphics Display
  • Advanced Display and Measurement Features
  • Programmable Channels: Monitor, Difference, Ratio, Math Functions, Linear and Log Values, Attenuation
  • USB 2.0 Interface and Software Suite
  • Continuous and Single-Shot Energy Measurement of Pulsed Laser Sources

Thorlabs’ Dual Channel PM320E Power and Energy Meter offers many feaures not found in handheld devices. It is ideal for precise optical measurements, laser and photodiode characterization, lifecycle measurements and many more applications in the lab and on the manufacturing floor.

The dual-channel design enables differential and ratiometric measurements. Intuitive manual operation with the large graphics display, compatibility to conventional photodiodes, and excellent remote capabilities enable easy system integration.

The PM320E is compatible with all Thorlabs Photodiode Sensors (dual-channel) and Thermal Sensors (single channel only) and allows the connection of unamplified anode or cathode grounded photodiodes with up to 10mA photocurrent and thermal elements with up to 100 mV output voltage.

Additionally the PM320E offers energy measurements with all Thorlabs Pyroelectric Energy Sensors (both channels). More information can be found in the Sensor Compatibility tab and the Power Meter Compatibility Chart.The PM320E is sold as a single benchtop device with the sensors available separately. Please see Thorlabs' complete line of sensors below.

Console Design
The calibrated sensors connect via two sub-D connectors on the rear panel, which also provides two analog high bandwidth outputs to allow monitoring of each channel, plus the programmable analog output. Optional user-supplied photodiodes connect via two BNC inputs on the front panel, which feature switchable bandwidth and a programmable bias voltage. The input can be switched between the front and rear connectors. The additional BNC output is gain-and-function programmable. It provides an analog voltage proportional to the output of one of the channels or as a difference or ratio of the two power meter channels. The measurement resolution is 16 bit for all power ranges. The PM320E are controlled locally via the front panel, which features a large 240 x 128 pixel LCD display, or remotely via USB 2.0.

In addition to the console, the following comes with each purchase: Software CD ROM, LabVIEW™ and LabWINDOWS™ /CVI Driver Set, Certificate of Calibration, and Operation Manual.

Item #PM320E
Compatible Sensors Photodiode, Thermal, and Pyroelectric
Number of Channels 2
Optical Power Rangea 100 pW to 200 W
Optical Energy Rangea 10 µJ to 15 J
Available Sensor Wavelength Rangea 185 nm - 25 μm
Display Refresh Rate 20 Hz
Bandwidtha DC - 100 kHz
Photodiode Sensor Rangeb 100 nA - 10 mA
Thermopile Sensor Rangeb 1 mV - 1 V
Pyroelectric Sensor Rangeb 100 mV - 100 V
  • Sensor Dependent
  • Ranges Selectable in Watts (Photodiode and Thermopile) or Joules (Pyroelectric) and is dependent on the sensor used.


Optical Power and Energy Meter, Dual-Channel Benchtop Console

* Benchtop, Dual-Channel Power and Energy Meter Console
* Large LCD Display Screen with Multiple Display Features
* Programmable Channels with Mathematical Functions
* Factory Calibrated with Certificate of Calibration


Standard Photodiode Power Sensors


  • For General Purpose Optical Power Measurements
  • Integrated Viewing Target for Easy Sensor Alignment
  • Ø9.5 mm Sensor Aperture
  • Compaptible Fiber Adapters: S120-xx Series
  • Compatible with the PM200, PM100D, PM100USB, PM100A, and PM320E Consoles
  • Sensor, Protective Cap, IR Target, and Thread Adapter Included


The S12xC Standard Photodiode Power Sensors are ideal for metering low power coherent and incoherent sources from the UV to the NIR. The NIST-traceable, calibrated sensors feature an integrated viewing target for easy alignment, enhanced shielding against electromagnetic interference, over temperature alert device, and large Ø9.5 mm sensor aperture. The sensors are compatible with 30 mm cage systems, Ø1/2" posts, and SM1 (1.035"-40) lens tubes, and are ideal for free-space and fiber-coupled sources.


Slim Photodiode Power Sensors - S13xC Series


  • For Optical Power Measurements in Confined Spaces
  • Very Slim Design: 5 mm Thin on Sensor Side
  • Ø9.5 mm Sensor Aperture
  • Slideable ND Filter Automatically Changes Sensor Power Range
  • Optional SM1A29 SM1-Threaded (1.035"-40) Fiber Adapter Sold Below
  • Compatible with the PM200, PM100D, PM100USB, PM100A, and PM320E Consoles


The S13xC Slim Photodiode Power Sensors are designed to take optical source power measurements in locations where space and accessibility are at a premium. The 5 mm thin Slim Photodiode Sensors can fit between closely space optics, cage systems, and other arrangements where standard power meters may not fit. The NIST-traceable, calibrated sensors also feature a large Ø9.5 mm sensor aperture and slideable neutral density filter for dual power ranges in one compact device.


Integrating Sphere Photodiode Power Sensors - S14xC Series


  • For Beam-Shape- and Entrance-Angle-Independent Power Measurements
  • Integrating Sphere Design Acts as a Diffuser with Minimal Power Loss
  • Ø5 mm or Ø12 mm Input Apertures
  • Removable S120-FC Fiber Adapters (FC/PC and FC/APC) Included
  • Compatible Fiber Adapters: S120-xx Series and S140-BFA Bare Fiber Adapter
  • Compatible with the PM200, PM100D, PM100USB, PM100A, and PM320E Consoles


The S14xC Integrating Sphere Photodiode Power Sensors are the choice for non-uniform, diverging, beam shape and entrance angle independent power measurements. Integrating spheres are ideal for power measurements from fiber sources, as well as off-axis free space sources. The integrating spheres feature large Ø5 mm or Ø12 mm apertures, SM1 (1.035"-40) threaded front connections, enhanced shielding against electromagnetic interference, and an overtemp alert sensor. NIST-traceable data is stored in the sensor connector.


Fiber Photodiode Power Sensors - S15xC Series


  • For Fiber-Based Optical Power Measurements
  • Compact Sensor Integrated into the Connector
  • Integrated Design for use in the Field and Lab
  • Includes PM20-FC Fiber Adapter
    • S150C and S151C Sensors also Include PM20-SMA SMA Adapter
  • Compatible with all PM20-xx Series Fiber Adapters
  • Compatible with the PM200, PM100D, PM100USB, PM100A, and PM320E Consoles


The S15xC Compact Fiber Photodiode Power Sensor is designed to take power measurements from a wide variety of fiber-coupled sources. The compact sensor, integrated into the power meter connector, features a unique integrated design housing the photodiode sensor, fiber coupling, and NIST-traceable data. The connectors included with these sensors are easily interchanged with a variety of standard fiber connectors.


Thermal Sensors for General Applications - S3xxC Series


  • For General Broadband Optical Power Measurements
  • Ø12 mm - Ø25 mm Sensor Area
  • Fast Response Time
  • Broadband Coatings with Flat Response over a Large Wavelength Range
  • Compaptible Fiber Adapters: S120-xx Series
  • Compatible with the PM200, PM100D, PM100USB, PM100A, and PM320E Consoles


The S3xxC Thermal Power Sensors are designed for broadband optical power measurements of low (100 µW) to high (200 W) power sources. The broadband coatings used on these thermal sensors feature a flat response over a wide range of wavelengths, as shown in the plot to the right.


NIST-traceable response curves are stored in the sensor connector. Aperture sizes from Ø12 mm to Ø25 mm allow easy alignment and measurement of large-spot-size laser sources. These sensors feature SM1 (1.035"-40) threading on the front for easy integration into existing cage and lens tube systems in addition to fiber coupling applications.


Thermal Sensors for Excimer and YAG Lasers - S3xxC Series


  • For Optical Power Measurements of Excimer and YAG Lasers
  • Ideal for Applications with High Peak Powers (10 W and 40 W Versions Available)
  • Ø25 mm or Ø40 mm Sensor Area
  • Fast Response Time
  • Compatible with the PM200, PM100D, PM100USB, PM100A, and PM320E Consoles


The S350C and S370C Thermal Sensors are designed for Excimer and YAG pulsed laser sources, respectively. The S350C sensor features a Ø40 mm aperture, while the S370C has a Ø25 mm aperture designed for easy alignment of large spot size pulsed lasers. The units are post mountable for free space applications and feature NIST-traceable data stored in the sensor connector.


Pyroelectric Sensors - ESxxxC Series


  • For General Purpose and High Energy Optical Pulse Measurements
  • Black Broadband Coating with Flat Response Over a Wide Wavelength Range
  • Ceramic Coating with High Damage Thresholds for High-Energy-Density Lasers
  • Ø11 mm - Ø45 mm Sensor Area
  • Comes with BNC Connector for Oscilloscope Use and a Sensor Adapter for Use with the
    PM200, PM100D, PM100USB, and PM320E Consoles


The ESxxxC Standard and High Energy Pyroelectric Sensors are designed to measure pulsed coherent and incoherent sources. Pyroelectric sensors are not suited for CW measurements, as they convert energy from light pulses into voltage pulses. A black broadband or ceramic coating is used for low or high power measurements, respectively. Large sensor areas from Ø11 mm - Ø45 mm allow easy alignment. The energy sensors features BNC connectors for oscilloscope use, as well as standard power meter connectors which contain NIST and PTB-traceable calibration data.


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