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OMEGA
HHLM-2
Digital Lightmeter
INTRODUCTION
This instrument is a portable easy use 3½ digit, compact-sized digital
lightmeter designed for simple one hand operation. Provides selected the lux and
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.
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.
• Cover sensor head when not in use to extend silicon photodiode sensor life.
1
The
symbol on the instrument indicates that the operator must refer to an
explanation in this manual.
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.
Storage Temperature: -20°C to 60°C (-4°F to 140°F), 0 to 80% R.H. with battery
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.
2
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
3
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)
Press this button for two seconds to turn the Back-Light on. As this also 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" button to toggle in and out of the DATA-HOLD mode. In the DATA-
HOLD mode, the " H " annunciator is displayed and the last reading is held on the
display.
4
OPERATION
1. Set the function switch to the desired lux or fc units.
2. Remove the sensor head cover.
3. Hold the sensor head steady and make certain that the light source completely
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.
5
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
The law stating that the illuminance E at a point on a surface varies directly with
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.
6
Cleaning
Periodically wipe the case with a damp cloth and detergent, do not use abrasives
or solvents.
CIE Photopic Curve
Wavelength in Nanometers
7
8
WARRANTY
OMEGA warrants this unit to be free of defects in materials and workmanship and to give satisfactory service for a
period of 13 months from date of purchase. OMEGA Warranty adds an additional one (1) month grace period to the
normal one (1) year product warranty to cover handling and shipping time. This ensures that OMEGA's customers
receive maximum coverage on each product. If the unit should malfunction, it must be returned to the factory for
evaluation. OMEGA's Customer Service Department will issue an Authorized Return (AR) number immediately
upon phone or written request. Upon examination by OMEGA, if the unit is found to be defective it will be repaired or
replaced at no charge. However, this WARRANTY is VOID if the unit shows evidence of having been tampered with
or shows evidence of being damaged as a result of excessive corrosion; or current, heat moisture or vibration;
improper specification;misapplication;misuse or other operating conditions outside of OMEGA's control.Components
which wear or which are damaged by misuse are not warranted. This includes contact points, fuses, and triacs.
OMEGA is glad to offer suggestions on the of use of its various products. Nevertheless, OMEGA only warrants
that the parts manufactured by it will be as specified and free of defects
OMEGA MAKES NO OTHER WARRANTIES OR REPRESENTATIONS OF ANY KIND WHATSOEVER,
EXPRESSED OR IMPLIED, EXCEPT THAT OF TITLE AND ALL IMPLIED WARRANTIES INCLUDING ANY
WARRANTY OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE HEREBY
DISCLAIMED.
LIMITATION OF LIABILITY:The remedies of purchaser set forth herein are exclusive and the total liability of
OMEGA with respect to this order, whether based on contract warranty, negligence, indemnification, strict
liability or otherwise, shall not exceed the purchase price of the component upon which liability is based. In
no event shall OMEGA be liable for consequential, incidental or special damages.
Every precaution for accuracy has been taken in the preparation of this manual; however, OMEGA ENGINEERING,
INC.neither assumes responsibility for any omissions or errors that may appear nor assumes liability for any damages
that result from the use of the products in accordance with the information contained in the manual.
SPECIAL CONDITION: Should this equipment be used in or with any nuclear installation or activity, purchaser will
indemnity OMEGA and hold OMEGA harmless from any liability or damage whatsoever arising out of the use of the
equipment in such a manner.
It is the policy of OMEGA to comply with all worldwide safety and EMC/EMI regulations that apply. OMEGA is
constantly pursuing certification of its products to the European New Approach Directives. OMEGA will add the CE
mark to every appropriate device upon certification.
The information contained in this document is believed to be correct but OMEGA Engineering, Inc. accepts no
liability for any errors it contains, and reserves the right to alter specifications without notice.
WARNING: These products are not designed for use in, and should not be used for, patient connected application.
RETURN REQUESTS / INQUIRIES
Direct all warranty and repair requests/inquiries to the OMEGA Customer Service Department.BEFORE RETURNING
ANY PRODUCT(S) TO OMEGA, PURCHASER MUST OBTAIN AN AUTHORIZED RETURN (AR) NUMBER FROM
OMEGA'S CUSTOMER SERVICE DEPARTMENT (IN ORDER TO AVOID PROCESSING DELAYS). The assigned
AR number should then be marked on the outside of the return package and on any correspondence.
The purchaser is responsible for shipping charges, freight, insurance and proper packaging to prevent breakage in
transit.
FOR WARRANTY RETURNS, please have the following FOR NON-WARRANTY REPAIRS, consult OMEGA for
information available BEFORE contacting OMEGA:
1. P.O. number under which the product was
PURCHASED.
2. Model and serial number of the product under
warranty, and
current repair charges. Have the following information
available BEFORE contacting OMEGA:
1. P.O. number to cover the COST of the repair.
2. Model and serial number of product , and
3. Repair instructions and/or specific problems relative
to the product.
3. Repair instructions and/or specific problems relative
to the product.
OMEGA's policy is to make running changes, not model changes, whenever an improvement is possible. This
affords our customers the latest in technology and engineering. OMEGA is a registered trademark of OMEGA
ENGINEERING, INC. © Copyright 1999 OMEGA ENGINEERING, INC. All rights reserved. This document may not
be copied, photocopied, reproduced, translated, or reduced to any electronic medium or machine-readable from, in
whole or in part, without prior written consent of OMEGA ENGINEERING, INC.
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