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PHOTOMETERS

QUANTUM PRECISION, PORTABLE PHOTOMETERS
The Necessary Instruments For Assuring Accurate Luminosity


  • Accurate digital display
  • Read foot-candles and foot-lamberts,or lux and candela/m 2 (nits)
  • Tough construction for rough handling
  • For many applications

For 2 decades the Quantum PhotoMeter has served industrial, scientific, and laboratory needs for precision light readings. PhotoMeter's small size and robust design assure readiness for the varied light measurements it can take.

(PhotoMeter shown with optional 1" Fiber Optic Probe.)

The hand held PhotoMeter measures illumination for architects, designers, scientists, and industrial engineers. For example, it readily compares ambient illumination to video screen brightness to determine suitability of the visual environment. PhotoMeters also measure vehicle headlamps on assembly lines, survey stage lighting, or measure any light source or reflecting surface.


PRINCIPAL FEATURES

PhotoMeters are simple to operate. Press the Measure button to get continuously updated readings. Releasing the Measure button freezes the last reading for convenient reference. The Range button adjusts the measurement display for the resolution desired.

The LED display is visible in very dim light, as well as direct sunlight. LED displays are inherently robust in comparison to LCD (liquid crystal) displays. Commonly available batteries power PhotoMeters for tens of thousands of readings.

STANDARD TURRETS
PhotoMeters include a standard turret.
For models PMEX and PMLX: Illuminance and Luminance Receptors.
For models PME and PML: Illuminance Receptor only.
ECONOMICAL SURVEY PHOTOMETERS E and L

PhotoMeter is built in an "E" version for English units of foot-candles, and an "L" version for metric units of lux. These two models are suitable for most survey measurements and comparative or repetitive light readings. Both E and L models have an approximate match to the C.I.E. (standard eye) color response.

Measurements of luminance are possible with the optional Luminance Receptor PM13. PhotoMeter E will read out foot-Lamberts and model L in nits (candela/m2). Please see note 1* under accessories.

Cosine Law:
Relative sensitivity versus
angle of incident light
EXTRA PRECISE
LABORATORY PHOTOMETERS EX and LX


PhotoMeters "EX" and "LX" are precision meters required for scientific and laboratory work. These models utilize filtered sensors with spectral response tightly calibrated to the C.I.E. Photopic response. The illuminance receptors closely follow the Cosine Law: Relative Sensitivity versus Angle of Illuminance.

These "X" versions can be adapted and calibrated to the Flexible (12") Fiber Optic Probe PM-12, or Rotating Illuminance Receptor PM-11, or Rigid (1") Fiber Optic Probe PM-10.

Luminance:
The field of view
is limited by 25°

Relative Sensitivity
versus angle

ACCESSORIES

PM-10
1" Fiber Optic Probe

PM-11
Rotating Illuminance
Receptor

PM-12
12" Flexible Fiber Optic Probe


Luminance Receptor
*Note 1 - All optional accessories must be calibrated to individual PhotoMeters. We recommend ordering accessories at the same time that the meters are ordered. Otherwise, it will be necessary to return the meters to the factory for calibration.
SPECIFICATIONS
PhotoMeter EX PhotoMeter E PhotoMeter LX PhotoMeter L
Model No. PMEX PME PMLX PML
Illuminance
(foot-candle)
0.01-99,900 0.01-99,900 - -
Illuminance
(lux)
- - 0.1-999,000 0.1-999,000
Luminance 0.01-99,900 See note 2** - -
Luminance
(cd/m2)
- - 0.1-999,000 See note 2**
Accuracy
Electrical
1% plus
2 digits
1% plus
2 digits
1% plus
2 digits
1% plus
2 digits
Accuracy
Spectral
7% @ 2800°K - 7% @ 2800°K -
Sensor Silicon with
photometric filter
Silicon with
infrared filter
Silicon with
photometric filter
Silicon with
infrared filter
Batteries Commonly available camera button cells: A76, MS76, 10L14, 357, or equiv.
Approx. size 4 x 2.8 x 1.2 inches (10 x 7 x 3 cm)
Weight 4 oz. (120g)
**Note 2 - Luminance measurements with PhotoMeter E and L are possible with optional Luminance Receptor PM-13. Must be calibrated to individual PhotoMeter.
C.I.E. CHART

Spectral sensitivity of the light sensors closely match the C.I.E. photopic response for PhotoMeters EX and LX. This is achieved through the use of a stable silicon photo-diode and three separate optical filters for accurate wavelength response.
Quantum PhotoMeter Dealers
Broadwest Corp. (CO) (303) 722-1500
Fluke Electronics (WA) (425) 347-6100
Abbeon Cal (CA) (805) 966-0810