User Manual

ManualsBrandsQuantum Instruments ManualsGeneral Photo AccessoriesPhoto-Meter LX

QUANTUM PHOTO-METER

models PME, PMEX, PML, PMLX

OPERATING INSTRUCTIONS

1. MODEL DESIGNATIONS

PME: Photometer for general measurements. Measures in footcandles.

Optional accessory available: Luminance Receptor PM13 calibrated for footlamberts.

PML: Photometer for general survey measurements. Measures in lux.

Optional accessory available: Luminance Receptor PM13 calibrated for nits (candela/m

PMEX: Precision photometer for scientific measurements. Color corrected to the C.I.E photopic response.

Pre-calibrated for foot-candles and footlamberts.

Optional accessories available: Rotating Illuminance Receptor PM11, Rigid Fiber Optic Probe

PM10, and Flexible Fiber Optic Probe PM12.

PMLX: Precision photometer for scientific measurements. Color corrected to the C.I.E photopic response.

Pre-calibrated for lux and nits (candela/m

Optional accessories available: Rotating Illuminance Receptor PM11 for lux, Rigid Fiber Optic

Probe PM10 for nits, and Flexible Fiber Optic Probe PM12 for nits.

FOR USE WITH

PME / PML

FOR USE WITH

PMEX / PMLX

PM-13 PM-10 PM-11 PM-12

2. MEASURE CONTROL

The Measure control is located on the right side of Photo-Meter. Press and hold the Measure control to take a

reading. Release the control to store the reading in memory and display it for a few seconds.

If the display shows only three dash lines, the light intensity is out of range. The Range control is on the left

side of Photo-Meter. Press it repeatedly, while holding Measure, until numbers appear in the display.

Summary of content (5 pages)

PAGE 1
QUANTUM PHOTO-METER models PME, PMEX, PML, PMLX OPERATING INSTRUCTIONS 1. MODEL DESIGNATIONS PME: Photometer for general measurements. Measures in footcandles. Optional accessory available: Luminance Receptor PM13 calibrated for footlamberts. PML: Photometer for general survey measurements. Measures in lux. Optional accessory available: Luminance Receptor PM13 calibrated for nits (candela/m2). PMEX: Precision photometer for scientific measurements. Color corrected to the C.I.E photopic response.
PAGE 2
Over Range Typical Reading The display will stay lit for a few seconds, after releasing Measure, with the last reading frozen in the display. 3. RANGE CONTROL The Range button on the left side of Photo-Meter sets the readout range on the digital display. Each time the Range button is pressed the meter switches to the next higher range. At the highest range, the next Range button press switches to the lowest (most sensitive) range. The table below illustrates how to cycle through the ranges.
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5. MEASURE TECHNIQUE Illuminance - foot-candles or lux This is the amount of light energy incident upon a plane. The plane is defined by the geometric plane of the white disc on the turret. Light sources within the (180°) hemisphere in front of the white disc will be sensed according to the cosine law. For best accuracy do not block light sources in the 180° hemisphere. The orientation of the white disc is designed to minimize the effect of the operator's presence on the measurement.
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and lowest reading is the effective light value. Conversion factors are shown below for other units of measurement. lux = footcandles x 10.8 footcandles = lux x .093 cd/m2 (nit) = footlamberts x 3.43 footlamberts = cd/m2 x .392 To determine candlepower (luminous intensity) of a light source, measure footcandles at a known distance from the source. Preferably, the distance (d) should be 10 times (or more) greater than the size of the source.
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