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°,

0.1° x 1° (Hor . Slit),

0.1° x 2° (Ver. Slit),

0.5° x 1.5° (Hor. Slit)

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
(28.0 cm x 17.0 cm x 20.3 cm)

Operating Temperature

34° to 95° F (1° to 35° C)

Humidity

0 - 90% non-condensing

  1. Luminance values are for the PR-740 with 8 nm bandwidth. For the PR-745, divide luminance values by 2.0.
  2. Luminance values are with the 8 nm bandwidth
  3. 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


Aperture


Aperture

0.5°
Aperture

0.25°
Aperture

0.1°
Aperture

MS-75
(355 mm to infinity)

355 mm
305 m

10.5 mm
10.64 m  

5.25 mm
5.32 m

2.63 mm
2.66 m

1.315 mm
1.33 m

0.525 mm
532 mm

SL-0.5X

94.1 mm
137 mm

3.0 mm -
5.08 mm

1.5 mm -
2.54 mm

0.75 mm -
1.27 mm

0.375 mm -
0.635 mm

0.15 mm
- 0.254 mm

SL-1X

46 mm -
66 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 -
0.132 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
30.5 m

35.0 mm
10.64 m

17.5 mm
5.32mm

8.75 mm
2.66 m

4.38 mm
1.33 m

1.75 mm 
532 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


Aperture


Aperture

0.5°
Aperture

0.250°
Aperture

0.1°
Aperture

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.

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