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PR-680 Spectroradiometer & Photometer

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PR-680 (pdf)

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Unique Design

The PR-680 SpectraDuo marks the beginning of a new era in light measurement. This unique patent pending, battery powered portable instrument is the first and only combined fast-scanning 256 detector element spectroradiometer and PMT based photometer on the market. The PR-680 has three available operating modes

  • As a fast scanning spectroradiometer (like the PR-650)

  • As a highly sensitive photometer (like the PR-880)
  • Auto Select mode which automatically selects between detectors based on the available signal.

The PR-680 is supplied with 4 automated measuring apertures (1°, ½°, ¼° and 1/8°) and automated measure shutter. Other hardware features include AutoSync® for automatically synchronising to the source refresh rate ensuring the utmost accuracy, a Secure Digital (SD) port for measurement storage, an external trigger port allowing remote measurement activation from either a push button or peripheral device, and a long lasting rechargeable Lithium-ion (Li) battery.

Easy to Use

The PR-680 is controlled via the on-board, 2.25" x 3" high resolution, full colour touch screen LCD display and 5-way navigation keypad for easy navigation. Following a measurement, the PR-680 displays data and colour spectral and CIE graphs on the system display. The PR-680 design provides stand alone operation - no PC required. The PR-680 can be also controlled via the world famous SpectraWin software over the USB or Bluetooth interface.


The unique design of the PR-680 makes tasks such as spectrally based colourimetry and high speed, low level luminance - required for display metrology - possible with a single instrument by supplying a wide dynamic range - 0.003 cd/m² (photometer and 1° aperture) to 2,200,000 cd/m² (spectral and 1/8° aperture) without using external neutral density filters. Since the Pritchard® viewing and measuring optics are shared by both detectors, tests can be performed without requiring realignment. An optional analogue output provides the capability of using the PMT as a high speed tool for characterising display ON / OFF response or waveform analysis of flash sources. We've further enhanced the flexibility by adding 2 extended sensitivity modes and 4 measurement speeds.

The PR-680 can be supplied with up to 15 remote heads connected to the instrument in a 'daisy chain' configuration to make simultaneous illuminance or luminance measurements. An ideal tool for tasks such as projector uniformity. For applications other than luminance the PR-680 can be supplied with optical accessories such as a cosine receptor for illuminance, LR-127 LED Analyser for testing LEDs to CIE 127, fibre probe for remote non-line-of-sight testing, and a series of magnification lens for small spot size analysis.


It's easy for the PR-680 to talk to the outside world - it comes equipped with USB and (optional) Bluetooth® wireless interfaces. It is supplied with text based, Remote Mode syntax and a driver that emulates an RS232 interface (COM: port) making it a simple task to generate custom programming to perform specific tasks or for inclusion in an ATE environment. If needed, an RS232 interface can be added to complement the standard USB.



256 detector array

Inter-detector alignment error


Spectroradiometer Wavelength Range

380 to 780 nm


Pritchard viewing and measuring system.

Digital Resolution

16 bits

Spectral Resolution

1.56 nm / pixel

Spectral bandwidth

8 nm (5 nm optional)

Spectral Accuracy

± 1 nm

Liminance accuracy (Against NIST luminance standard)

Spectral - ± 2%
Photometer - ± 2%

Luminance repeatability

= 1% at 3 cd/m²

Colour Accuracy (for Illuminant A)

±0.0015 in CIE 1931 x,y

Measurement Capabilities

Luminance, Illuminance, luminous intensity, chromaticity, correlated color temperature, dominant wavelength.

Measurement Time

6 ms to 24 secs.


Rechargeable Lithium-ion. (= 12 hours continuous operation)


4 lbs (1.8 kg)

Operating Temperature

34° to 95° F (1° to 35° C)


  1. Sensitivities are for 100:1 signal to RMS noise against an Illuminant A based NIST traceable luminance standard

  2. All specifications are subject to change without notice

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