Pro-Lite maintains a Photo Research PR-670 spectroradiometer that is available for short-term rental. The portable PR-670 employs “Pritchard” (or reflex) viewing optics for spot luminance measurements, but can also be adapted for illuminance measurements with the supplied accessory cosine diffuser. The PR-670 is configured for spectral measurements in the visible wavelength range, 380-780nm and as well as making brightness measurements, it can also report CIE chromaticity and correlated colour temperature (CCT) in Kelvin.
The PR-670’s reflex viewing optics allows the operator to conveniently view a display or light source through the eyepiece and then focus and align a central black measurement spot within the target object. The PR-670 features internal, selectable apertures that allows the operator to vary the minimum measurement spot between 5.25, 2.63, 1.32 and 0.66mm diameter at the minimum working distance of 355mm.
Photo Research PR-670 Overview
Pro-Lite maintains a Photo Research PR-670 spectroradiometer that is available for short-term rental. The portable PR-670 employs “Pritchard” (or reflex) viewing optics for spot luminance measurements, but can also be adapted for illuminance measurements with the supplied accessory cosine diffuser. The PR-670 is configured for spectral measurements in the visible wavelength range, 380-780nm and as well as making brightness measurements, it can also report CIE chromaticity and correlated colour temperature (CCT) in Kelvin.
The PR-670’s reflex viewing optics allows the operator to conveniently view a display or light source through the eyepiece and then focus and align a central black measurement spot within the target object. The PR-670 features internal, selectable apertures that allows the operator to vary the minimum measurement spot between 5.25, 2.63, 1.32 and 0.66mm diameter at the minimum working distance of 355mm.
Pritchard Optics
When measuring small character stroke widths or miniscule samples in a large field, an accurate and precise optical system is essential to insure proper alignment. The world renowned Pritchard Optics is such a system, widely accepted as the most accurate and versatile in use today. In the Pritchard system the user sees a bright and magnified image in the centre of which is a black dot (aperture). Since only the light passing through the aperture is measured, the aperture accurately and unambiguously defines the measuring field within the operator’s field of view.
The PR-670 is as easy to use as point-and-shoot. The Pritchard optics system makes target alignment as easy as aim and focus. When you are ready to make a measurement, simply press the measure button. The PR-670 is supplied with 4 automated measuring apertures (1°, 1/2°, 1/4° and 1/8°). The multi apertures are ideal for measuring both large and small targets without the need for any additional lenses or accessories, and with minimal repositioning of the instrument. If the spot coverage with the standard MS-75 lens is too large, the PR-670 can be equipped with a close-up magnification lens to achieve spot coverage as small as 0.113mm.
Colour Touchscreen
The PR-670 is fully portable – no PC is required. Menus are accessed via the on-board, 3.5” high resolution, full colour touch screen LCD display and 5-way navigation keypad. Following a measurement, the PR-670 displays data and colour spectral graphs on the system display.
Portability
The PR-670 is shipped with a Li-Ion battery which, on a full charge, can last for over 12 hours of continuous use. Secure Digital (SD) storage allows for over 80,000 measurements on a 512 MB card. Measurements stored on the SD card can be viewed on the instrument or using the optional SpectraWin® 2 Windows software.
RGB White Point Calibration
In addition to spectrally based measurements of luminance, chromaticity coordinates and correlated colour temperature, the PR-670 provides the user with a spectrally based interactive method of performing white point calibrations of CRTs, LCDs, PDPs and digital projectors, among others. Since the PR-670 is a spectrally based system, white point calibration can be achieved simply by entering target values into the setup screens including luminance and chromaticity coordinates (CIE 1931 xy values). The user can also select from pre-stored phosphor sets (NTSC, SMPTE, HDTV, etc.) or create user phosphor values to be used during the calibration sequence.
Parameter | PR-670 Specification |
Spectral Range | 380-780nm (visible light) |
Detector | 256 Element Photodiode Array |
Exposure Time | 6-30,000ms |
Spectral Resolution | 8nm |
Spectral Accuracy | ± 1nm |
Luminance Range | 0.03 – 8,566,000 cd/m2 |
Luminance Accuracy | ± 2% |
Colour Accuracy | ± 0.0015 CIE xy |
Aperture | 1, 0.5, 0.25 & 0.125° |
Measurement Spot Size | 5.25, 2.63, 1.32 and 0.66mm |
Power | Lithium ion battery, rechargeable |
Interface | USB |
Data Storage | Secure Digital (SD) card |
Dimensions | 356 x 202 x 82mm |
Weight | 1.7kg |
| Qty | Accessory Description |
| 1 | MS-75 Lens For spectral radiance & luminance measurements. Note that there is a 355mm minimum work distance with this lens and corresponding measurement spot sizes of 5.25, 2.63, 1.32 and 0.66mm diameter. |
| 1 | SL-1X Close Up Lens For spectral radiance & luminance measurements. Note that there is a 46mm minimum working distance with this lens and corresponding measurement spot sizes of 0.89, 0.45, 0.23 and 0.12mm diameter. |
| 1 | CR-670 Cosine Receiver For spectral irradiance & illuminance measurements, 90 degree geometry. |
| 1 | RS-3 Diffuse Reflectance Standard |
| 1 | BT-L11 Lithium Ion Battery & AC-670 AC Adaptor |
| 1 | SD Card (512 MB) |
| 1 | CD with Operation Manual & Software Drivers |
| 1 | Soft-Sided Carry Case |
The PR-670 is configured for the following measurements:
Measurement | Units | Application |
Spectral Radiance | W/sr.m2 | Luminance, chromaticity and correlated colour temperature (CCT) of displays, back-lit controls and other light sources. NOTE: the target object must overfill the measurement field-of-view of the PR-670. the PR-670 is equipped with four, internal selectable apertures. When equipped with the MS-75 lens, the corresponding measurement spot sizes are 5.25, 2.63, 1.32 and 0.66mm diameter at the minimum working distance of 355mm. |
Spectral Irradiance | W/m2 | Illuminance, chromaticity and correlated colour temperature (CCT) light sources. Please note that you may convert from measured illuminance to luminous intensity in candelas by application of the inverse squared rule. |
Please note that Pro-Lite’s PR-670 is currently “out of calibration”. That isn’t to suggest that the instrument will yield incorrect measurement values, however it has not been submitted for a recent factory calibration. To ensure that the reliability of readings that you take with the PR-670, Pro-Lite will submit it to an internal comparison calibration prior to its release for rental. This involves measuring a stabilised Labsphere USS-600 luminance standard first with an in-calibration Specbos 1211 spectroradiometer, then with the PR-670. The difference (if any) between the two readings will be recorded and the PR-670 supplied with a correction factor that the user can apply (if required) to any readings that they take with the PR-670.
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