Pritchard PR-1980B Spectroradiometer

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PR-1980B (pdf)

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The Pritchard Optical System, after more than three decades. is still widely accepted as the most accurate and versatile in use today. As shown in the diagram, the objective lens forms an image at the Pritchard mirror. The light being measured passes through the selected aperture and the filter turrets to the photomultiplier tube. The balance of light at the Pritchard mirror surface is reflected into the patented, variable magnification viewing system. The operator sees a bright, erect magnified image in the centre of which is a black dot. The dot is created by the hole in the mirror. and since only light passing through the hole is being measured, the dot accurately and unambiguously defines the measuring field within the viewing field. The measuring and viewing system is self-aligning. There are no mirrors, fibre optics or other optical impediments in the measuring path, so no polarisation error is introduced. A metallic mirror fabricated with as many as 6 apertures is the heart of this unique system. Rotating the mirror places a different size aperture on the boreal axis, which changes the angular coverage of the measuring field. Five different angular measuring fields from 2 minutes (2') to 3 degrees (3°) are standard, and are available merely by turning a knob An optional sixth aperture such as a slit aperture is available as well as numerous optical accessories covering a wide range of light measurement applications. For example. see the patented MicroScanner Spatial Scanning Attachment.

The PR-1980B family of Pritchard Tele/Micro Spectroradiometers is available in a wide variety of configurations to meet your specific spectral, spatial or spectral/spatial requirements. The standard spectral range of the PR-1980B Extended Spectral Range Options are 360-830nm, 290-830nm or with special selection, 360-860nm or 290-860nm.

Spectral Scanning System Control Console/Computer Options include the /SC, /USC-1 and /USC-2. The same Console/Computer Options are available for the Spectral/Spatial Scanning System with the SC-80A MicroScanner Linear Spatial Scanner.

For added versatility, all PR-1980B Pritchard SpectraRadiometers retain all the basic capabilities of the PR-1980A Prichard Photometer when operated in "A" (Photometer) mode.

Typical Applications

QC of colour CRTs

Colour Temperature of CRTs

QC of colour panel displays

Radiance and colourimetry of light sources.

Primary instrument standard for MIL Spec colour

Colour matching

LED sorting by colour and/or intensity

Colour-related human factors studies

Metameric studies

Spectral transmission studies

Spectral reflectance studies

MTF/contrast measurement of displays

Automotive lighting

Airport/aircraft lighting

Spectrophotometry/colourimetry

Visual task studies

Roadway lighting

Ground truth studies

Colour and intensity distribution of flat panel displays

Automatic test and evaluation of displays

QUAL testing

Systems Description

PR-1980B/SC, /USC-1 & /USC-2 Spectral Scanning Systems

The PR-1980B/SC, /USC-1 & /USC-2 Pritchard SpectraRadiometers are the definitive colour measurement systems in the industry today. They significantly reduce the complexity of computer assisted spectroradiometric/spectrocolorimetric scanning, and have been instrument in taking this technique out of the laboratory environment ad making it available as a general quality control or production test procedure.

The systems stress simple, error free operation, much the same way as the patented** AutoComp, AutoRange and AutoZero automatic features of the PR-1980A Photometer simplify measurements and reduce human errors. Indeed, all the capabilities and features of that industry-standard instrument are included in the PR-1980B/SC, /USC-1 & /USC-2.

Powerful user friendly software programs have specifically written to minimise the program initiation procedures, often reducing them to a single keystroke command.***

**U.S. Patent, 3,818,198

***Note: Computers, software and interfaces are not included. See PDF download for software and interface options.

System Components

The PR-1980B/SC Pritchard SpectraRadiometer Spectral Scanning system consists of the PR-1980B-OR Optical Head containing the optical system, the PR-1980B-SC Control Console containing the system electronics, and the required inter-connecting cables. The /USC-1 and USC-2 also include the UCI-80 Universal Computer Interface Levels 1 or 2 and specified software. The PR-1980BX/SC substitutes the PR1980B-X Extended Spectral Range Optical Head.

The PR1980B Field Coverage and Relative Sensitivity for lenses and apertures

LENS or Accessory

Focusing Range

Lens-To-Subject Distance

FIELD APERTURE

Category

Model

3°

1°

20'

6'

2'

0.4' x 40' slit

FOCUSABLE

7 in. Standard Lens OL-7

4 ft.
(1.22 m)
to infinity

1000 ft.
(305m)

663in.
(16.85m)
1

209in.
(5.31m)
10

66.2in.
(1.68m)
100.0

20.9in.
(531mm)
1000

6.68in.
(169mm)
10,000

1.34 x 134in.
(33.8mm x 3.38m)
2,500

OL-3.5 ⁽²⁾

2 ft.
(610 mm)
to infinity

1000 ft.
(305m) ⁽¹⁾

1326in.
(33.68m)
1

418in.
(10.62m)
10

132in.
(3.36m)
100

41.8in.
(1.06m)
1000

13.36in.
(339mm)
10,000

2.67 x 207in.
(67.8mm x 6.78m)
2,500

Wide Field Lens WFL-10

0 in.
(0 mm)
to infinity

10 in.
(254mm) ⁽¹⁾

3.17in.
(80.5mm)
0.97

1.00in.
(25.4mm)
9.7

0.317in.
(8.05mm)
97

0.100in.
(2.54mm)
970

0.032in.
(0.81mm)
9,700

0.006 x 0.6in.
(0.15 x 15mm)
2,400

FOCUSABLE

Used with OL-7

I luminance Baffle IB-80B⁽³⁾

4 ft.
(1.22 m)
to infinity

1000 ft.
(305m) ⁽¹⁾

663in.
(16.85m)
0.0013

N/A

N/A

N/A

N/A

N/A

Supplementary Lens SL-40A

21 in. to 57 in.
(533 mm to 1.45 m)

40 in.
(1.02m) ⁽¹⁾

2.22in.
(56.4mm)
1.05

0.700in.
(17.8mm)
10.5

0.221in.
(5.61mm)
105

0.070in.
(1.78mm)
1,050

0.022in.
(0.56mm)
10,500

0.004 x 0.4in.
(0.1 x10mm)
2,600

Supplementary Lens SL-20A

14 inc. to 24 in.
(356 mm to 609 mm)

20 in.
(508mm) ⁽¹⁾

1.11in.
(28.2mm)
1.04

0.350in.
(8.89mm)
10.4

0.111in.
(2.82mm)
104

0.035in.
(0.89mm)
1,040

0.011in.
(0.28mm)
10,400

0.002 x 0.2in.
(0.05 x 5.0mm)
2,600

Supplementary Lens SL-10A

8 in. to 11 in.
(203 mm to 279mm)

10 in.
(254mm) ⁽¹⁾

0.555in.
(14.1mm)
1.03

0.175in.
(4.45mm)
10.3

0.055in.
(1.40mm)
103

0.018in.
(0.46mm)
1,030

0.006in.
(0.15mm)
10,300

0.001 x 0.1in.
(0.025 x 2.5mm)
2,600

FIXED FOCUS

MicroSpectar LF-19A

FIXED
2.7 in.
(68.6 mm)

2.7 in.
(68.6mm)

0.199in.
(5.07mm)
1.09

0.063in.
(1.60mm)
10.9

0.019in.
(0.50mm)
109

0.006in.
(0.16mm)
1,090

0.002in.
(0.05mm)
10,900

0.0004 x 0.04in.
(0.01 x 1.0mm)
2,700

Cosine Receptor CR-100^(5,6)

N/A

N/A

N/A
4.3

N/A
43

N/A
430

N/A
4,300

N/A
43,000

N/A
11,000

Flexible Probe FP-80B (6)

N/A

N/A

N/A
15

N/A
150

N/A
1,500

N/A
15,000

N/A
150,000

N/A
37,000

Used with MS-80A, OL-7 or OL-14

LED Receptor LD-80B⁽⁴⁾

N/A

N/A

2.00in.
(50.8m)
900,000

N/A

N/A

N/A

N/A

N/A

FIXED FOCUS

14 in. Lens OL-14

FIXED Infinite Only

1000 ft.
(305m) to infinity ⁽¹⁾

332in.
(8.43m)
1.1

105in.
(2.67m)
11

33.1in.
(841mm)
110

10.5in.
(265mm)
1,100

3.34in.
(85mm)
11,000

0.67 x 6.7in.
(17 x 1.7mm)
2,700

FIXED FOCUS

Macro Lenses

MacroSpectar MS-80A

FIXED
6.6 in.
(168mm)

6.6 in.
(168mm)

0.387in.
(9.83mm)
1.07

0.122in.
(3.09mm)
10.7

0.039in.
(0.98mm)
107

0.012in.
(0.31mm)
1,070

0.004in.
(0.10mm)
10,700

0.0008 x 0.08in.
(0.02 x 2.0mm)
2,700

MacroSpectar MS-610

FIXED
24 in.
(610mm)

24 in.
(610mm)

0.387in.
(9.83mm)
1.42

0.122in.
(3.09mm)
14.2

0.039in.
(0.98mm)
142

0.012in.
(0.31mm)
1,420

0.004in.
(0.10mm)
14,200

0.0008 x 0.08in.
(0.02 x 2.0mm)
3,500

Micro Lenses

MS-5X

FIXED
0.7in.
(17.8mm)

0.7 in.
(17.8mm)

0.078in.
(1.98mm)
1.05

0.024in.
(0.61mm)
10.5

0.008in.
(0.20mm)
105

0.002in.
(0.061mm)
1,050

0.0008in.
(0.020mm)
10,500

0.0002 x 0.02in.
(0.005 x 0.50mm)
2,600

MS-7X

FIXED
0.7in.
(17.8mm)

0.7 in.
(17.8mm)

0.055in.
(1.40mm)
1.15

0.017in.
(0.443mm)
11.5

0.006in.
(0.142mm)
115

0.002in.
(0.044mm)
1,150

0.0006in.
(0.016mm)
11,500

0.00011 x 0.0112in.
(0.0028 x 0.28mm)
2,900

MS-10X

FIXED
0.6in.
(15.2mm)

0.6 in.
(15.2mm)

0.039in.
(0.99mm)
2

0.012in.
(0.30mm)
20

0.004in.
(0.10mm)
200

0.001in.
(0.025mm)
2,000

0.0004in.
(0.010mm)
20,000

0.00008x 0.008in.
(0.002 x 0.2mm)
5,000

MS-25X

FIXED
0.6in.
(15.2mm)

0.6 in.
(15.2mm)

0.015in.
(0.393mm)
14.1

0.005in.
(0.124mm)
141

0.002in.
(0.04mm)
1,410

0.0005in.
(0.012mm)
14,000

0.0002in.
(0.004mm)
141,000

0.00003x 0.003in.
(0.008 x 0.08mm)
35,000

MS-50X

FIXED
0.3in.
(7.6mm)

0.3 in.
(7.6mm)

0.008in.
(0.197mm)
29

0.002in.
(0.062mm)
290

0.0008in.
(0.0198mm)
2,900

0.0002in.
(0.0061mm)
29,000

0.00008in.
(0.0020mm)
290,000

0.00002 x 0.002n.
(0.00051 x 0.051mm)
73,000

MicroScanner SC-80A

1X

FIXED
4.5in.
(113mm)

4.5 in.
(113mm)

0.387in.
(9.83mm)
1.2

0.122in.
(3.09mm)
12

0.039in.
(0.98mm)
120

0.012in.
(0.031mm)
1,200

0.004in.
(0.10mm)
12,000

0.0008 x 0.08in.
(0.02 x 2.0mm)
3,000

2X

FIXED
2.1in.
(53mm)

2.1 in.
(53mm)

0.194in.
(4.92mm)
1.2

0.061in.
(1.55mm)
12

0.019in.
(0.49mm)
120

0.006in.
(0.155mm)
1,200

0.002in.
(0.05mm)
12,000

0.004 x 0.04in.
(0.01 x 1.0mm)
3,000

5X

FIXED

0.6 in.
(15.3mm)

0.086in.
(2.18mm)
2.4

0.027in.
(0.69mm)
24

0.0087in.
(2.22mm)
240

0.0027in.
(0.068mm)
2,400

0.0009in.
(0.023mm)
24,000

0.0002 x 0.02in.
(0.005 x 0.5mm)
6,000

10X

FIXED

0.44 in.
(11.2mm)

0.047in.
(1.19mm)
5.3

0.015in.
(0.038mm)
53

0.0047in.
(0.12mm)
530

0.0015in.
(0.037mm)
5,300

0.0005in.
(0.012mm)
53,000

0.0001x 0.01in.
(0.0025 x 0.25mm)
13,000

20X

FIXED

0.44 in.
(11.1mm)

0.025in.
(0.62mm)
1.6

0.0077in.
(0.20mm)
16

0.0025in.
(0.063mm)
160

0.00076in.
(0.019mm)
1,600

0.00025in.
(0.006mm)
16,000

0.00005 x 0.005in.
(0.0012 x 0.12mm)
4,000

Notes:
Numbers shown in blue are relative sensitivity factors
(1) Field coverage is proportional to distance. For example, coverage at 100 ft. is 1/10 the coverage at 1000ft.
(2) Field coverage is twice(2x) OL-7 coverage, but it cannot be used with IB-80B or LR-80B.
(3) The results of this threshold sensitivity calculation are in the units of footcandles, lux or W/sr with a 3° field aperture only.
(4) This factor and the source factor (A) must be applied only to the threshold luminance in cd/m2 to give threshold luminous intensity in candelas
(5) The result of this threshold sensitivity calculation are in the units of footcandles, lux and W/sr
(6) The CR-100 and FO-80 have lower blue transmission than other accessories. These factors maybe higher for predominantly blue light sources (not for ultraviolet)Numbers shown in blue are relative attenuation factors

Pritchard® PR-1980B Spectroradiometer

Pritchard^® PR-1980B Spectroradiometer