Light Measurement
PR-740/745
Overview
The PR-740 (spectral range 380 - 780 nm) and PR-745 (spectral range 380 – 1080 nm) SpectraScan spectroradiometers have the two most wanted attributes of any light measuring instrument - superior sensitivity and speed. For the PR-740, the minimum measureable luminance is 0.000005 footlamberts (0.000015 cd/m2). For the PR-745, 0.0000025 footlamberts (0.0000075 cd/m2). These two world-class instruments also introduce a new feature to the SpectraScan line - variable spectral bandwidth. Most self-scanning spectroradiometers feature a single system bandwidth. The Variable Bandwidth option provides three bandwidths, selected from the instrument menu or from a PC using Remote Mode Commands or SpectraWin 2 software. Bandwidth sizes include 2, 4 and 8 nm for the PR-740 or 4, 8 and 14 nm for the PR-745. This option is useful when it is necessary to resolve the spectral profile of narrow band sources with more precision (using a smaller bandwidth) or get more throughput for broadband sources (using a larger bandwidth) without changing instruments or measuring spot size.
Features
Easy to Use
The high-resolution, full colour touch screen display provides both an easy means of negotiating through instrument setup menus and of viewing measured results, including a full-colour Spectral Power Distribution (SPD) graph of the measured sample
Connectivity
A wide selection of interfacing options, USB, RS232 and Bluetooth wireless, adds convenience and ease when communicating with and controlling the PR-730. With the Bluetooth option, the instrument will communicate up to 30m away from the base - ideal for situations where cabling is not possible.
Variable Spectral Bandwidth
The PR-730 introduces a new feature to the SpectraScan line - variable spectral bandwidth. One of 3 bandwidth settings (2, 5 or 8 nm) can be selected regardless of the measuring aperture being used. This lets the user change the bandwidth without changing apertures - or instruments.
Versatility
The PR-740/745 provides unsurpassed flexibility with the world's largest selection of optical accessories. It is the only instrument in its class that can measure radiance/luminance, irradiance/illuminance, radiant flux/lumens and radiant intensity/candelas simply by changing accessories.
Control
Remote Mode software makes it possible to control the PR-730 from a custom application as easy as sending and receiving text characters over any of the interfaces. SpectraWin is a full Windows based program that makes measurements, graphically dislays results and has powerful data manipulation capabilities.
An RGB Display Cal Module can be added to SpectraWin - it provides and interactive capability that helps automate the process of calibrating displays or digital projectors.
User Self Calibration Software is available if you wish to calibrate your instrument in-house. It can be a great time and money saver especially when several instruments are involved.
Other features include:
- Virtually no instrument polarization error or stray light
- Up to 8 automated measuring apertures on a single instrument
- Communication over USB, R8232 and Bluetooth (wireless) interfaces
- A full-color touch screen display
- SD card measurement storage for menu navigation and measured data presentation
- Both instruments feature the patented AutoSync feature insuring accurate results regardless of the refresh or backlight characteristics of the device under test by optimizing the measurement to the temporal characteristics of the device.
- If portability is important, an optional Li-ion battery is available that provides more than 8 hours of continuous use. The PR-740 / 745 are the only instruments in their class that offers this versatility.
Manufactured by Photo Research
Specifications
Wavelength Range | PR-740 : 380 nm - 780 nm | |
|---|---|---|
PR-745 : 380 nm - 1080 nm | ||
Detectors | 512 Cooled Detectors | |
Spectral Bandwidth | Option 1 | PR-740 : 3, 5 or 8 nm |
PR-745 : 5, 9 or 14 nm | ||
Option 2 : Switchable | PR-740 : 2, 4 and 8 nm | |
PR-745 : 4, 8 and 14 nm | ||
Wavelength Accuracy | PR-740 : < 0.4 nm | |
PR-745 : < 0.8 nm | ||
Spectral Resolution | PR-740 : 1nm | |
PR-745 : 2nm | ||
Digital Resolution | 16 bits | |
Available Measuring Apertures (Select up to 8 per instrument) | 2°, 1°, 1/2°, 1/4°, 1/8°, 0.2°, 0.1°, | |
Standard Lens | MS-75 - 75 mm | |
Luminance Sensitivity for Illuminant A (2856K) 1 2 | 0.0003 cd/m² with 2° aperture | |
Luminance accuracy 1 2 | ±2% against NIST traceable Illuminant A standard at 0.003 fL (0.009 cd/m²) with 2° aperture | |
Luminance repeatability 1 2 | ≤1% at 0.0031 fL (0.009 cd/m²) with 2° aperture against NIST traceable Luminance Standard at 2856K (Illuminant A) | |
Color Accuracy 1 2 | ±0.0015 for CIE 1931 x, y for Illuminant A (2856K) at 0.003 fL (0.009 cd/m²) with 2° aperture | |
Color Repeatability 1 2 | 0.0005 for CIE 1931 x, y for Illuminant A (2856K) at 0.003 fL (0.009 cd/m²) with 2° aperture | |
Polarization Error | <0.2% | |
Stray Light Stray Light | <0.06% | |
Storage | Secure Digital (SD) Card | |
AutoSync Range | 20 to 2000 Hz | |
Interfaces | USB, Bluetooth or RS232 | |
Power Requirements | Rechargeable Li-ion battery or AC Adapter (90 - 240 VAC) | |
Battery Life | > 8 hours | |
Weight | 14.25 lbs. (6.46 kg) | |
Dimensions | 11.03 in. L x 6.69 in. W x 8.0 in. H | |
Operating Temperature | 34° to 95° F (1° to 35° C) | |
Humidity | 0 - 90% non-condensing | |
- Luminance values are for the PR-740 with 8 nm bandwidth. For the PR-745, divide luminance values by 2.0.
- Luminance values are with the 8 nm bandwidth
- For the PR-745, multiply bandwidth values by 2
Note:
All specifications are subject to change without notice.
Aperture vs. Measurement Spot Size
Accessory | Working Distance | 2° | 1° | 0.5° | 0.25° | 0.1° |
|---|---|---|---|---|---|---|
MS-75 | 355 mm | 10.5 mm | 5.25 mm | 2.63 mm | 1.315 mm | 0.525 mm |
SL-0.5X | 94.1 mm | 3.0 mm - | 1.5 mm - | 0.75 mm - | 0.375 mm - | 0.15 mm |
SL-1X | 46 mm - | 1.78 mm - 2.64mm | 0.89 mm - 1.32mm | 0.445 mm - 0.660 mm | 0.226 mm - 0.330 mm | 0.089 mm - |
MS-2.5X | 46 mm | 1.02 mm | 0.51 mm | 0.225 mm | 0.128 mm | 0.051 mm |
MS-5X | 28 mm | 0.578 mm | 0.289 mm | 0.145 mm | 0.072 mm | 0.0289 mm |
MS-7.5 | 100 mm | 35.0 mm | 17.5 mm | 8.75 mm | 4.38 mm | 1.75 mm |
LA-730 | Contact | 13.2 mm | 13.2 mm | 13.2 mm | 13.2 mm | 13.2 mm |
FP-730 | Contact | 3.17 mm | 3.17 mm | 3.17 mm | 3.17 mm | 3.17 mm |
Luminance Sensitivity (fL) †
Accessory | Units | 2° | 1° | 0.5° | 0.250° | 0.1° |
|---|---|---|---|---|---|---|
MS-75 | fL | 0.0001 | 0.0004 | 0.0016 | 0.0064 | 0.041 |
cd/m² | 0.00034 | 0.0014 | 0.0055 | 0.022 | 0.14 | |
SL-0.5X | fL | 0.0001 | 0.0004 | 0.0016 | 0.0064 | 0.041 |
cd/m² | 0.00034 | 0.0014 | 0.0055 | 0.022 | 0.14 | |
SL-1X | fL | 0.0001 | 0.0004 | 0.0016 | 0.0064 | 0.041 |
cd/m² | 0.00034 | 0.0014 | 0.0055 | 0.022 | 0.14 | |
MS-2.5X | fL | 0.00025 | 0.001 | 0.004 | 0.016 | 0.10 |
cd/m² | 0.0009 | 0.0034 | 0.0137 | 0.055 | 0.34 | |
MS-5X | fL | 00.0004 | 0.0016 | 0.0064 | 0.026 | 0.16 |
cd/m² | 0.0014 | 0.0055 | 0.022 | 0.089 | 0.55 | |
MS-7.5 | fL | 0.0001 | 0.0004 | 0.0016 | 0.0064 | 0.041 |
cd/m² | 0.00034 | 0.0014 | 0.0055 | 0.022 | 0.14 | |
LA-740 | fL | 0.0001 | 0.0004 | 0.0016 | 0.0064 | 0.041 |
cd/m² | 0.00034 | 0.0014 | 0.0055 | 0.022 | 0.14 | |
FP-740 | fL | 0.00025 | 0.001 | 0.004 | 0.016 | 0.10 |
cd/m² | 0.0009 | 0.0034 | 0.0137 | 0.055 | 0.34 | |
CR-740 | fc | 0.0002 | 0.0008 | 0.0032 | 0.0128 | 0.08 |
lux | 0.002 | 0.008 | 0.032 | 0.128 | 0.80 |
† Stated sensitivities are for a precision of 10:1 against an Illuminant A (2856 K) source
Note:
All specifications are subject to change without notice.
Applications
Aerospace
Aerospace displays, regardless of the model, present a unique challenge in that required capabilities range from very low (0.1 fl ) to very high (10,000 fc) photometric levels of small areas. The PR-740/745 meets these challenges by providing multiple apertures, variable bandwidth and excellent sensitivity
Computer Displays / TV's
Photo Research SpectraScans have been providing solutions to the computer display and TV markets for decades. The PR-740/745 now makes it possible to easily address one of the toughest tasks, spectral contrast measurements, without having to relay on a second instrument.
Components
The PR-740/745 is not just a luminance meter. It's wide range of accessories can address virtually any light measurement application. For example, the LR-127 LED Analyzer is designed to measure discrete LED's for conformity to the CIE 127 Technical Report - Measurement of LED's.
Brochures
Resources
Software Options
6740-0002-00 - SW-740 - SpectraWin™ 2 Lite Operating Software
Full featured, menu driven, Windows software. Calculates luminance, CIE chromaticity, correlated color temperature, dominant wavelength and excitation purity from measured spectral data. Provides features such as graphically represented spectral distribution and CIE color space (1931 and 1976), data manipulation (math functions) save/recall binary or ASCII files, print graphics screens or tabular data, reflectance/ transmittance L*a*b*u*v* measurements, ?E Color Difference and Color Rendering Indices (CRI) of lamp sources. Operates under Windows XP. (Windows XP Professional recommended).
All software is serialized to an instrument. One licensed copy needs to be purchase per instrument.
6740-0002-01 - SW-740-P - SpectraWin™ 2 Pro Operating Software
Includes all of the capabilities of SpectraWin™ 2 Lite and also features a Macro Option allowing the end user to create macros that can generate automated test sequences.
All software is serialized to an instrument. One licensed copy needs to be purchase per instrument.
6740-0002-07 - SpectraWin Lite to Pro Upgrade
6740-0002-02 - SpectraWin™ 2 RGB DisplayCal Module
Optional module in SpectraWin™ 2 Lite or Pro designed for spectrally based white point calibrations of CRT's, LCD's, PDP's and digital projectors. Calibration is based on "learned" RGB values or user entered Y, xy, CCT values. Calibration is facilitated by on-screen graphical feedback of an RGB bar graph or a moving color point within a CIE diagram. Must be purchase with SpectraWin™ 2.
All software is serialized to an instrument. One licensed copy needs to be purchase per instrument.
6740-0002-03 - PR-740/745 SDK (.DLL)
Fully documented API for measurement, control and data transfer from the PR-740/745. Includes C++ and Visual Basic sample code and SpectraWin™ 2 Lite software. Compatible with Windows XP operating system or higher.
One licensed copy per instrument must be purchased.
6740-0002-04 - USC-740 - User Self-Calibration Software
Provides complete recalibration capabilities for the PR-740/745 including wavelength accuracy, spectral intensity and linearity. Requires helium (e.g. WC-100) or mercury-argon (e.g. WC-715/745) wavelength calibration source and variable spectral radiance/luminance standard (e.g. LRS-455). This package provides that ability to calibrate one instrument aperture.
All software is serialized to an instrument.
One licensed copy needs to be purchase per instrument. Consult the PROML Price List for more information regarding sources.
6740-0002-08 - USC-740 - Aperture Module Software
This software module is required to calibrate additional apertures (multiple aperture instruments). One module is required for each additional aperture (i.e. a three aperture instrument requires two modules). All software is serialized to an instrument.
One licensed copy needs to be purchase per instrument.
See USC-740 User-Self Calibration Software
*Requires Calibration with Instrument