Omega Products HHSL1 Installation Manual

OMEGA

HHSL1

SOUND LEVEL METER

omega. com

TM

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http://www.omega.com

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SM

INTRODUCTION

This instrument is a portable easy use 3½ digit, compact-sized digital sound
level meter designed for simple one hand operation, and can be mounted on a
tripod for long-term measurement. Meter with A and C frequency weighting of the
RMS signal, F and S time weighting and maximum level indication.

SAFETY INFORMATION

It is recommended that you read the safety and operation instructions before
using sound level meter.

1. The sound level meter must be protected from shocks and vibration as it is a

precision instrument.

2. The microphone in particular must be protected from exposure to water or dust.

The unit should also not be stored in locations with high temperatures or

humidity.

3. Dust or contamination can alter the performance characteristics of the unit.

Always replace the unit in its carrying case when not in use.

4. The microphone cover at the tip of the unit is not designed to be removed. Do

not try to disengage the cover. Cleaning the microphone is not advisable.

1

SPECIFICATIONS

GENERAL

Display: 3½ digit liquid crystal display (LCD) with maximum reading of 1999.
Low battery indication: The " " is displayed when the battery voltage drops

below the operating level.

Measurement rate: one times per second, nominal.
Operating Environment: -10°C to 50°C at < 90% relative humidity.
Storage Temperature: -20°C to 60°C, 0 to 80% R.H. with battery removed from

meter.

Battery: 4 pcs 1.5V (AAA size).
Battery Life: 50 hours typical.
Dimensions: 217mm(H) x 44mm(W) x 40mm(D).
Weight: 168g including batteries.
Accessories: Windscreen x1, Battery x4, Plug x1,

Tripod mounting screw-nut x1,
Carrying case x1

2

ELECTRICAL

Applicable Standard: IEC 651-1979 Type 2

Measurement Range:Lo - range 35-90 dB
Resolution: 0.1dB.

Frequency Weighting: A and C according to IEC 651 Type 2.
Frequency Range: 31.5 Hz to 8000 Hz.
Detector: True-RMS with independent frequency weightiness.
Dynamic Range: 55dB.
Maximum Hold decay time: <1dB/3minute with Reset switch.
Time Weighting: S(SLOW) and F(FAST) according to IEC 651 Type 2.
Microphone: 1/2" electret(prepolarized) condenser microphone.
DC Output: Output - 10 mV/dB.

Output Impedance - 50W approx.

AC Output: Output - 1V RMS corresponding to the top of the selected

measurement range.
Output Impedance - 600W approx.

ANSI S1.4-1983 Type 2
JIS C 1502

Hi - range 75-130 dB

3

Warm-up: <5s
Calibration Conditions: Reference Frequency: 1000 Hz.

Environmental Effects
Effect of Temperature: <0.5dB (-10°C to 50°C).
Effect of Humidity: <0.5dB for 30%<RH<90% (at 40°C, 1KHz).

Reference SPL: 94 dB.
Reference Temperature: 20°C.
Reference RH: 65%.
Reference Range: 75-130dB.
Reference Direction of incidence: Frontal.

4

OPERATING INSTRUCTIONS

1.Setting the Measurement Range

Slide switch "O(power-off) / Lo(35-90dB) / Hi(75-130dB)".

The meter have 2 sound pressure level(SPL) measurement ranges each with

a dynamic range of 55dB.

The sound pressure level indication is updated every one second.

If OVER or UNDER is continuously shown, change the setting of the power-

range slide switch to a suitable range.

2. Setting the Time Weighting

Slide switch: S(SLOW) / F(FAST)

The time weightiness available are shown below:

S(SLOW): for normal measurements
F(FAST): for checking average levels of fluctuating noise.

3. Setting the Frequency Weighting

Slide switch: A / C.

The available frequency weightiness of the RMS signal are shown below:

A: for general sound level measurement

5

C: for checking the low-frequency content of a noise
(If the C-weighted level is much higher than the A-weighed level, then there
is a large amount of low-frequency noise.)

4. Setting the Maximum Level Hold

Slide switch: MAX / RESET

The MAX Hold is used to measure the maximum level of sounds. The

maximum measured level is indicated continuously.

To reset the maximum level indication and enter the new measurement, set the

slide switch to RESET position.

5. Using the AC and DC Output Jack

AC Output: Serves to supplies AC signals (approx. 0.55Vrms at the top of the

selected measurement range) to external equipment.

DC Output: Serves to supplies DC signals (approx. 10mV/dB) to external

equipment.

GROUND

DC Output

AC Output

6

6.Using the Tripod Mounting Screw-Nut

For long-term measurements, the meter can be mounted on a tripod.

(1) Remove the screw from the back of the meter.

(2) Replace the screw by the tripod mounting Screw-Nut.

(3) Use the tripod mounting screw fixed to the tripod mounting Screw-Nut.

(2)

(3)

-

-

7

7. Calibrating

(1) Set the meter slide switch to the Hi-range (75-130dB), A-weighting ,

F(FAST)-time weighting and RESET positions.

(2) Fit the sound level calibrator carefully onto the meter and rest the meter on

a table or other flat surface. Ensure that the calibrator fits snugly on the

microphone.
(3) Set calibrator at 94dB and 1KHz.
(4) Switch on the calibrator. The calibrator emits a 1KHz calibration signal.
(5) Remove the 94dB CAL label from the front of the meter.
(6) Adjust the calibration control to obtain a reading of 94.0dB.

8

MEASUREMENT CONSIDERATIONS

1. Background Noise
If the level difference between the absence and presence of the sound to be
measured is 10dB or more, the influence of background noise may be
disregarded.
If the difference is less, a compensation as shown below should be applied.

Level difference (dB) 4 5 6 7 8 9 10
Compensation value (dB)

2. Reflection
The microphone should be placed well away from reflective surfaces such as
walls or the floor, in order to eliminate errors due to reflections. When making
sound measurements, hold the meter at arms length. This will help to avoid
both reflections from your body and also blocking of sound from some
directions.

3. Make sure that nothing obstructs the noise source.

4. Be careful not to accept readings. If the meter is under loaded and overloaded.

-2.2 -1.7 -1.3 -1 -0.8 -0.7 0

9

MAINTENANCE

Battery Replacement

Power is supplied by four 1.5V (AAA size) batteries. The " " appears on the LCD
display when replacement is needed. To replace the batteries, remove the screw
from the back of the meter and lift off the battery cover case. Remove the
batteries from battery contacts.

Cleaning

Periodically wipe the case with a damp cloth and detergent, do not use abrasives
or solvents.

10

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 g race 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 def ectiv e it will be repaired or
replaced at no charge. How e ver, this W ARRANTY 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 f or 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.

WARRANTY

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.

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 prev ent breakage in
transit.

FOR WARRANTY RETURNS, please hav e the f ollowing

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

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.

RETURN REQUESTS / INQUIRIES

FOR NON-WARRANTY REPAIRS, consult OMEGA for

current repair charges. Hav e the f ollo wing inf ormation
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.

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