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Pritchard® PR-1980A Photometer

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PR-1980A (pdf)

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The Pritchard Tele/Micro Photometer

Still the proven leader in precision photometric/calorimetric light measuring instruments after more than three decades. The PR-1980A is known for it's superior performance, high sensitivity and maximum versatility in the lab or in the field. It features the patented Pritchard Optical System with built in attenuators, polarisers, colourimetry filters and field apertures interchangeable from 2 arc minutes to 3 degrees. Many special apertures are also available.

The PR-1980A also combines five dynamic features no other light measuring system does- our patented** AutoComp and AutoRange and AutoZero features, detector overload protection circuit and internal calibration verification. This unique combination virtually eliminates human error and manual computations while maintaining a precise, error-free direct readout.

** US. Patent 3,818,198

 Typical Applications

  •  Night vision studies

  •  Image intensifier calibration
  •  Visual task studies
  •  Roadway lighting
  •  Automotive lighting
  •  Airport lighting
  •  Material reflectance studies
  •  CRT luminance and contrast
  •  MTF and resolution testing
  •  Display measurements
  •  LED measurements
  •  Aircraft panel luminance and colour
  •  Mil-Spec compliance
  •  Colour temperature determination
  •  Star simulator calibration
  •  Electroluminescent panel evaluation
  •  Head-up display measurements
  •  Flash lamp and beacon analysis

 

Threshold sensitivity

PMT

FootLamberts

cd-m-2

Standard S-20

3.0 x 10-6

2.0 x 10-5

Cooled S-20

1.0 x 10-6

6.7 x 10-5

Extended multialkali S-25

6.0 x 10-6

4.0 x 10-5

Cooled S-25

2.0 x 10-6

1.3 x 10-5

 

Aperture Size and Range of full-scale sensitivity

Field Aperture

Sensitivity Range (in footlamberts)

Sensitivity Range (in candelas/meter2 )

3°

10-5 to 103

10-4 to 104

1°

10-4 to 104

10-3 to 105

20'

10-3 to 105

10-2 to 106

6'

10-2 to 106

10-1 to 107

2'

10-1 to 107

100 to 108

0.4' x 40'

10-1 to 107

100 to 108

 

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)
1000 

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)
1000

Wide Field Lens WFL-10

0 in.
(0 mm)
to infinity

10 in.
(254mm) (1)

3.17in.
(80.5mm)
1

1.00in.
(25.4mm)
10

0.317in.
(8.05mm)
100

0.100in.
(2.54mm)
1000

0.032in.
(0.81mm)
10,000

0.006 x 0.6in.
(0.15 x 15mm)
1000

CO-2000 Cassegrain Objective

30 ft.
(9.14 m) to infinity

1000 ft.
(305m) (1

56.8in.
(1.44m)
10

17.9in.
(455mm)
100

5.73in.
(145mm)
1000

1.79in.
(45.5mm)
10,000

0.572in.
(14.5mm)
100,000

0.114 x 11.44in.
(2.86 x 290.4mm)
10,000

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)
0.001

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

0.700in.
(17.8mm)
10

0.221in.
(5.61mm)
100 

0.070in.
(1.78mm)
1050

  0.022in.
(0.56mm)
10,000

0.004 x 0.4in.
(0.1 x10mm)
1000

Supplementary Lens SL-20A

14 inc. to 24 in.
(356 mm to 609 mm)

20 in.
(508mm) (1)

1.11in.
(28.2mm)
1  

0.350in.
(8.89mm)
10

0.111in.
(2.82mm)
100

0.035in.
(0.89mm)
1000

0.011in.
(0.28mm)
10,000

0.002 x 0.2in.
(0.05 x 5.0mm)
1000 

Supplementary Lens SL-10A

8 in. to 11 in. 
(203 mm to 279mm) 

10 in.
(254mm) (1)

0.555in.
(14.1mm)
1

0.175in.
(4.45mm)
10

0.055in.
(1.40mm)
100

0.018in.
(0.46mm)
1000

0.006in.
(0.15mm)
10,000

0.001 x 0.1in.
(0.025 x 2.5mm)
1000 

FIXED FOCUS

MicroSpectar LF-19A

FIXED
2.7 in.
(68.6 mm)

2.7 in.
(68.6mm)

0.199in.
(5.07mm)
1

0.063in.
(1.60mm)
10

0.019in.
(0.50mm)
100

0.006in.
(0.16mm)
1000

0.002in.
(0.05mm)
10,000

0.0004 x 0.04in.
(0.01 x 1.0mm)
1000

Cosine Receptor CR-100(3)

N/A

N/A

N/A
0.1

N/A

N/A

N/A

N/A

N/A

Flexible Probe FP-80B

N/A

N/A 

0.12in.
(3.0mm)
10

0.12in.
(3.0mm)
100

0.12in.
(3.0mm)
1000

0.12in.
(3.0mm)
10,000

0.12in.
(3.0mm)
100,000

N/A
10,000

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

LED Receptor LD-80B(4)

N/A

N/A

2.00in.
(50.8m)
10,000

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

105in.
(2.67m)
10

33.1in.
(841mm)
100

10.5in.
(265mm)
1000

3.34in.
(85mm)
10,000

0.67 x 6.7in.
(17 x 1.7mm)
1000

FIXED FOCUS

Macro Lenses

MacroSpectar MS-80A

FIXED
6.6 in.
(168mm) 

6.6 in.
(168mm)

0.387in.
(9.83mm)
1.00

0.122in.
(3.09mm)
10

0.039in.
(0.98mm)
100

0.012in.
(0.31mm)
1000

0.004in.
(0.10mm)
10,000 

0.0008 x 0.08in.
(0.02 x 2.0mm)
1000

MacroSpectar MS-610

FIXED
24 in.
(610mm)

24 in.
(610mm)

0.387in.
(9.83mm)
10

0.122in.
(3.09mm)
100 

0.039in.
(0.98mm)
1000

0.012in.
(0.31mm)
10,000

0.004in.
(0.10mm)
100,000

0.0008 x 0.08in.
(0.02 x 2.0mm)
10,000

Micro Lenses

MS-5X

FIXED
0.7in.
(17.8mm)

0.7 in.
(17.8mm)

0.078in.
(1.98mm)
1.00

0.024in.
(0.61mm)
10

0.008in.
(0.20mm)
100

0.002in.
(0.061mm)
1000

0.0008in.
(0.020mm)
10,000

0.0002 x 0.02in.
(0.005 x 0.50mm)
1000

MS-7X

FIXED
0.7in.
(17.8mm)

0.7 in.
(17.8mm)

0.055in.
(1.40mm)
10

0.017in.
(0.443mm)
100 

0.006in.
(0.142mm)
1000

0.002in.
(0.044mm)
10,000

0.0006in.
(0.016mm)
100,000

0.00011 x 0.0112in.
(0.0028 x 0.28mm)
10,000

MS-10X

FIXED
0.6in.
(15.2mm)

0.6 in.
(15.2mm)

0.039in.
(0.99mm)
10

0.012in.
(0.30mm)
100

0.004in.
(0.10mm)
1000

0.001in.
(0.025mm)
10,000

0.0004in.
(0.010mm)
100,000

0.00008x 0.008in.
(0.002 x 0.2mm)
10,000

MS-25X

FIXED
0.6in.
(15.2mm)

0.6 in.
(15.2mm)

0.015in.
(0.393mm)
100

0.005in.
(0.124mm)
1000

0.002in.
(0.04mm)
10,000

0.0005in.
(0.012mm)
100,000

0.0002in.
(0.004mm)
100,000

0.00003x 0.003in.
(0.008 x 0.08mm)
100,000 

MS-50X

FIXED
0.3in.
(7.6mm)

0.3 in.
(7.6mm)

0.008in.
(0.197mm)
100

0.002in.
(0.062mm)
1000

0.0008in.
(0.0198mm)
10,000

0.0002in.
(0.0061mm)
100,000

0.00008in.
(0.0020mm)
1x106 

0.00002 x 0.002n.
(0.00051 x 0.051mm)
100,000 

MicroScanner SC-80A

1X

FIXED
4.5in.
(113mm)

4.5 in.
(113mm)

0.387in.
(9.83mm)
10.0 

0.122in.
(3.09mm)
100

0.039in.
(0.98mm)
1000

0.012in.
(0.031mm)
10000

0.004in.
(0.10mm)
1x106 

0.0008 x 0.08in.
(0.02 x 2.0mm)
10,000 

2X

FIXED
2.1in.
(53mm)

2.1 in.
(53mm)

0.194in.
(4.92mm)
10

0.061in.
(1.55mm)
100

0.019in.
(0.49mm)
1000

0.006in.
(0.155mm)
10,000

0.002in.
(0.05mm)
100,000

0.004 x 0.04in.
(0.01 x 1.0mm)
10,000

5X

FIXED

0.6 in.
(15.3mm)

0.086in.
(2.18mm)
10 

0.027in.
(0.69mm)
100

0.0087in.
(2.22mm)
1000

0.0027in.
(0.068mm)
10,000

0.0009in.
(0.023mm)
100,000 

0.0002 x 0.02in.
(0.005 x 0.5mm)
10,000

10X

FIXED

0.44 in.
(11.2mm)

0.047in.
(1.19mm)
10

0.015in.
(0.038mm)
100

0.0047in.
(0.12mm)
1000

0.0015in.
(0.037mm)
10,000

0.0005in.
(0.012mm)
100,000

0.0001x 0.01in.
(0.0025 x 0.25mm)
10,000

20X

FIXED

0.44 in.
(11.1mm)

0.025in.
(0.62mm)
10 

0.0077in.
(0.20mm)
100 

0.0025in.
(0.063mm)
1000

0.00076in.
(0.019mm)
10,000

0.00025in.
(0.006mm)
100,000

0.00005 x 0.005in.
(0.0012 x 0.12mm)
10,000

      Notes:
      Numbers shown in blue are relative attenuation 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) Results of calculations using this accessory are in footcandles or LUX
      (4) Results of calculations using this accessory are in millicandles(mcd). The dimensions given are the maximum size LED displays that can be measured

 

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