Omega HHLM-2 User manual

OMEGA
HHLM-2
Digital Lightmeter

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TM

INTRODUCTION
This instrument is a portable easy use 3½ digit, compact-sized digital
lightmeterdesignedforsimpleonehandoperation.Providesselectedtheluxand
fc units. Meter with Backlit LCD display, PEAK-HOLD (50mS pulse light) and
DATA-HOLD feature.
SAFETY INFORMATION
It is recommended that you read the safety and operation instructions before
using the lightmeter.
1
WARNING
• To avoid electric shock, do not operate this product in wet or damp
conditions.
• To avoid injury or fire hazard, do not operate this product in an explosive
atmosphere.
• To avoid eye injury, wear eye protection if there is a possibility of exposure
to high-intensity rays.
• Do not immerse in liquids, clean the sensor head using only a damp cloth.
• Coversensorheadwhennotinusetoextendsiliconphotodiodesensorlife.

2
SPECIFICATIONS
GENERAL
Display: 3½ digit liquid crystal display (LCD) with maximum reading of 1999.
Overrange: (OL) is displayed.
Low battery indication: the " " is displayed when the battery voltage drops
below the operating level.
Measurement rate: 2.5 times per second, nominal.
Operating Environment: 0°C to 50°C (32°F to 122°F) at < 70% relative
humidity.
StorageTemperature: -20°Cto60°C(-4°Fto140°F),0to80%R.H.withbattery
removed from meter.
Accuracy: Stated accuracy at 23°C ± 5°C (73°F ± 9°F), <70% relative humidity.
Analog Output: 0.1mV/counts
Battery: 4 pcs 1.5V (AAA size).
Battery Life: 200 hours typical.
Dimensions: 170mm(H) x 44mm(W) x 40mm(D).
Weight: 220g (7.76oz) including batteries.
The symbol on the instrument indicates that the operator must refer to an
explanation in this manual.

3
ELECTRICAL
Photometric Formulas:
10.764·footcandles=lux (lumens/meter2)
0.0929·lux=footcandles(lumens/foot2)
Range: 20lux,200lux,2000lux,20000lux,20fc,200fc,2000fc,20000fc
Resolution: 0.01lux,0.01fc
Spectral response: CIE photopic
The CIE photopic curve is an international standard for the color response
of the average human eye
Acceptance angle: ¦¢2<2% cosine corrected (150°)
Total accuracy for CIE standard illuminant A (2856K): ±(3%rdg + 10dgts)
CIE standard illuminant A can be realised by means of CIE standard
source A, which is defined as: A gas-filled tungsten-filament lamp
operating at a correlated colour temperature of 2856K
Temperature Coefficient: 0.1x (specified accuracy)/°C (<18°C or >28°C),
0.056x(specified accuracy)/°F (<64.4°F or >82.4°F)
Peak Hold response time: >50mS pulse light

4
OPERATING INSTRUCTIONS
Push buttons
Back-Light ( >2sec) and Peak-Hold Switch :
Press this button to toggle in and out of the PEAK-HOLD mode. The " P MAX
" annunciator are displayed.(Response Time:>50mS)
Pressthis buttonfortwo secondstoturn theBack-Lighton. Asthisalso activates
the PEAK-HOLD mode, briefly press the button to return to normal display. To
turn the Back-Light off press again for two seconds.
Range Select Button
Press "RANGE" button to select the desired lux or fc range. Each time you press
"RANGE" button, the range (and the input range annunciator) incremants, and
a new value is displayed.
HOLD (DATA-HOLD) Button
Press"HOLD"buttontotoggleinandoutoftheDATA-HOLDmode.IntheDATA-
HOLDmode,the"H"annunciatorisdisplayedandthelastreadingisheldonthe
display.

5
OPERATION
1. Set the function switch to the desired lux or fc units.
2. Remove the sensor head cover.
3.Holdthesensorheadsteadyandmakecertainthatthelightsourcecompletely
fills the cosine correction dome.
4. Move away from the sensor head to avoid shadowing it. The sensor head has
a 1.5 meter cable to allow separation between the observer and the measure-
ment location.
5. Read the illuminance value from the display. If magnitude of lux (or fc) is not
known, press RANGE button to the highest range and reduce until a satisfac-
tory reading is obtained.
6. Cover sensor head to extend sensor life.

6
SPECIAL CONSIDERATIONS
• Keep the plastic domed cosine corrector clean and free of scratches. It may
be cleaned with a soft cloth and isopropyl alcohol.
• When light is received from many directions simultaneously, take special care
to avoid reflections or shadowing the sensor with your body.
• For best accuracy, repeat the measurement several times to ensure that the
light source has remained stable.
• Avoid flexing the cable excessively at either end of the cable.
•The Inverse-square Law
ThelawstatingthattheilluminanceEatapointonasurfacevariesdirectlywith
the intensity I of a point source, and inversely as the square of the distance d
between the source and the point. If the surface at the point is normal to the
direction of the incident light, the law is expressed by E=I/d2.
•Cosine Law
The law that the illuminance on any surface varies as the cosine of the angle
of incidence. The angle of incidence q is the angle between the normal to the
surface and the direction of the incident light. The inverse-square low and the
cosine law can be combined as E=(I cos q )/d2.

7
Cleaning
Periodicallywipethecasewithadampclothanddetergent,donotuse abrasives
or solvents.
CIE Photopic Curve
Luminous Efficiency Coefficient Lumen/Watt Conversion Factor
Wavelength in Nanometers

8
Vl
CIE Photopic Photopic
Wavelength Luminous Lumen/Watt
(nm) Effciency Conversion
Coefficient Factor
380 0.0000 0.05 390 0.0001 0.13 400 0.0004 0.27 410 0.0012 0.82 420 0.0040 2.73 430 0.0116 7.91 440 0.0230 15.7 450 0.0380 25.9 460 0.0600 40.9 470 0.0910 62.1 480 0.1390 94.8 490 0.2080 142.0 500 0.3230 220.0 510 0.5030 343.0 520 0.7100 484.0 530 0.8620 588.0 540 0.9540 650.0 550 0.9950 679.0 555 1.0000 683.0 560 0.9950 679.0 570 0.9520 649.0 580 0.8700 593.0 590 0.7570 516.0 600 0.6310 430.0 610 0.5030 343.0 620 0.3810 260.0 630 0.2650 181.0 640 0.1750 119.0 650 0.1070 73.0 660 0.0610 41.4 670 0.0320 21.8 680 0.0170 11.6 690 0.0082 5.59 700 0.0041 2.78 710 0.0021 1.43 720 0.0010 0.716 730 0.0005 0.355 740 0.0003 0.170 750 0.0001 0.820 760 0.0001 0.041