945 - Sound Level Meter FLUKE - Free user manual and instructions

Product Type	Sound Level Meter
Brand	Fluke
Model	945
Standards Compliance	IEC 651 Type 2, ANSI S1.4 Type 2, JISC 1502
Display	4-digit LCD with backlight
Microphone	1/2 inch Electret condenser
Frequency Range	31.5 Hz to 8 kHz
Measurement Range (A)	30 to 130 dB
Measurement Range (C)	35 to 130 dB
Accuracy	±1.5 dB
Resolution	0.1 dB
Time Weighting	FAST (125 ms), SLOW (1 s)
Frequency Weighting	A and C
Dynamic Range	50 dB
Data Hold	Freezes reading
MIN/MAX	Captures minimum and maximum levels
Backlight	White LED, auto-off after 15 seconds
Auto Power Off	After approx. 5 minutes
Calibration	Using 94 dB, 1 kHz calibrator
Calibration Cycle	1 year
Power Supply	9V alkaline battery (NEDA 1604 / IEC 6LR61)
Battery Life	Approx. 50 hours
Dimensions	200 x 55 x 38 mm (7.8 x 2.2 x 1.5 in)
Weight	233 g (0.5 lb) including battery
Operating Temperature	5°C to 40°C (41°F to 104°F)
Operating Humidity	< 80% RH
Storage Temperature	-10°C to 60°C (14°F to 140°F)
Storage Humidity	< 70% RH
Included Accessories	9V battery, user manual, windscreen
Safety	Use windscreen for wind > 10 m/s
Maintenance	Clean with mild detergent and water; repair only by authorized center
Spare Parts / Repairability	Battery replacement by user; other repairs by service center
Certifications	CE, EMC (IEC 61326-1, CISPR 11), KCC Class A, WEEE

Frequently Asked Questions - 945 FLUKE

How do I turn on the Fluke 945 sound level meter?

Press the Power button (button 6) to turn on the meter. The LCD will display the current sound level.

How do I calibrate the Fluke 945?

Set the meter to dBA and FAST time weighting. Insert the microphone into a 94 dB, 1 kHz calibrator. Press and hold the A/C and HOLD buttons simultaneously for more than 1 second. When the LCD blinks, release both buttons. The display should show 94.0 dBA. Repeat if necessary.

How do I replace the battery?

Turn off the meter. Slide out the battery cover on the back. Replace the old battery with a 9V alkaline battery (NEDA 1604 / IEC 6LR61). Slide the cover back into place.

What is the difference between A and C weighting?

A weighting is used for general noise measurement. C weighting is used to check low-frequency noise content. If the C-weighted level is much higher than the A-weighted level, there is significant low-frequency noise.

How do I use the MIN/MAX function?

Press the MIN/MAX button (button 5) to toggle between displaying the maximum and minimum values measured since the function was activated. Press and hold the button for more than 2 seconds to disable the MIN/MAX feature.

How do I use the Data Hold function?

Press the HOLD button (button 9) to freeze the current reading on the LCD. Press again to release the hold. The display will show 'HOLD' when active.

What is the difference between FAST and SLOW time weighting?

FAST (125 ms) is used for short bursts or catching sound peaks. SLOW (1 second) is used for measuring the average level of fluctuating noise.

How do I clean and maintain the Fluke 945?

Clean the outer surfaces with a mild detergent and water solution applied sparingly on a soft cloth. Do not use harsh solvents. Allow to dry completely before use. For repairs, contact a Factory Authorized Service Center.

What does it mean when the display shows '-+'?

The low battery indicator '-+' appears on the LCD when the battery needs replacement. Replace the battery with a new 9V alkaline battery to ensure proper operation.

Does the Fluke 945 have an auto power off feature?

Yes, the meter automatically turns off after approximately 5 minutes of inactivity to conserve battery life.

USER MANUAL 945 FLUKE

January 2009, Rev. 1, 5/18

© 2009-2018 Fluke Corporation, All rights reserved. Specifications are subject to change without notice. All product names are trademarks of their respective companies.

LIMITED WARRANTY AND LIMITATION OF LIABILITY

Each Fluke product is warranted to be free from defects in material and workmanship under normal use and service. The warranty period is one year and begins on the date of shipment. Parts, product repairs, and services are warranted for 90 days. This warranty extends only to the original buyer or end-user customer of a Fluke authorized reseller, and does not apply to fuses, disposable batteries, or to any product which, in Fluke's opinion, has been misused, altered, neglected, contaminated, or damaged by accident or abnormal conditions of operation or handling. Fluke warrants that software will operate substantially in accordance with its functional specifications for 90 days and that it has been properly recorded on non-defective media. Fluke does not warrant that software will be error free or operate without interruption.

Fluke authorized resellers shall extend this warranty on new and unused products to end-user customers only but have no authority to extend a greater or different warranty on behalf of Fluke. Warranty support is available only if product is purchased through a Fluke authorized sales outlet or Buyer has paid the applicable international price. Fluke reserves the right to invoice Buyer for importation costs of repair/replacement parts when product purchased in one country is submitted for repair in another country.

Fluke's warranty obligation is limited, at Fluke's option, to refund of the purchase price, free of charge repair, or replacement of a defective product which is returned to a Fluke authorized service center within the warranty period.

To obtain warranty service, contact your nearest Fluke authorized service center to obtain return authorization information, then send the product to that service center, with a description of the difficulty, postage and insurance prepaid (FOB Destination). Fluke assumes no risk for damage in transit. Following warranty repair, the product will be returned to Buyer, transportation prepaid (FOB Destination). If Fluke determines that failure was caused by neglect, misuse, contamination, alteration, accident, or abnormal condition of operation or handling, including overvoltage failures caused by use outside the product's specified rating, or normal wear and tear of mechanical components, Fluke will provide an estimate of repair costs and obtain authorization before commencing the work. Following repair, the product will be returned to the Buyer transportation prepaid and the Buyer will be billed for the repair and return transportation charges (FOB Shipping Point).

THIS WARRANTY IS BUYER'S SOLE AND EXCLUSIVE REMEDY AND IS IN LIEU OF ALL OTHER WARRANTIES, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO ANY IMPLIED WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. FLUKE SHALL NOT BE LIABLE FOR ANY SPECIAL, INDIRECT, INCIDENTAL, OR CONSEQUENTIAL DAMAGES OR LOSSES, INCLUDING LOSS OF DATA, ARISING FROM ANY CAUSE OR THEORY.

Since some countries or states do not allow limitation of the term of an implied warranty, or exclusion or limitation of incidental or consequential damages, the limitations and exclusions of this warranty may not apply to every buyer. If any provision of this Warranty is held invalid or unenforceable by a court or other decision-maker of competent jurisdiction, such holding will not affect the validity or enforceability of any other provision.

Fluke Corporation

P.O. Box 9090

Everett, WA 98206-

9090

U.S.A.

Fluke Europe B.V.

P.O. Box 1186

5602 BD Eindhoven

The Netherlands

11/99

To register your product online, visit http://register.fluke.com

1 Windscreen
2 Microphone
3 LCD display
4 Frequency weighting select button
5 Maximum/Minimum button
6 Power button
7 Backlight button
8 Time weighting select button
9 Data Hold button

CONTENTS

Symbols....5

Unpacking and Inspection 5

Introduction....5

Operation....5

MIN/MAX....6

HOLD 6

Backlight....6

Calibration Procedures 6

Specifications 6

Maintenance and Repair 7

Battery Replacement 8

SYMBOLS

The following symbols are used on the Product and in this manual.

Symbol Description
	WARNING.RISK OF DANGER.
	Consult user documentation.
	Battery or battery compartment.
	Conforms to relevant South Korean EMC Standards.
	Conforms to relevant Australian Safety and EMC standards.
	Conforms to European Union directives.
[7602]	This product complies with the WEEE Directive marking requirements. The affixed label indicates that you must not discard this electrical/electronic product in domestic household waste. Product Category: With reference to the equipment types in the WEEE Directive Annex I, this product is classed as category 9 “Monitoring and Control Instrumentation” product. Do not dispose of this product as unsorted municipal waste.

Warning and Precautions

• For wind speeds over 10 m/sec (22.3 mph), use the windscreen on the microphone.
• For general sound level measurements use A weighting. For checking the low-frequency content of noise use C weighting. If the C-Weighted level is much higher than the A-weighted level, then there is a large amount of low-frequency noise
• For normal measurements use the FAST mode. For checking average level of fluctuation noise use the SLOW mode.

UNPACKING AND INSPECTION

Your shipping carton should include:

1 Fluke-945 sound level meter
1 9 volt battery
1 Users Manual

If any of the items are damaged or missing, return the complete package to the place of purchase for an exchange.

INTRODUCTION

This Sound Level Meter has been designed to meet the measurement requirements of safety Engineers, Health, Industrial safety offices and quality control in various environments. This unit conforms to the IEC651 Type 2, ANSI S1.4 Type 2, JISC1502 requirements for Sound Level Meter.

OPERATION

1. Press Ⓐ button for power ON.
2. Select the desired response time and weighting. If the sound source consists of short bursts or only catching sound peak, set response to FAST. To measure average sound level, use the slow setting. Select A weighting for general noise sound level and C weighting for measuring sound level of acoustic material.
3. Hold the instrument comfortably in hand or fix on tripod and point the microphone at the suspected noise source, the sound pressure level will be displayed.

MIN/MAX

The MIN/MAX feature reads and updates the display to show the maximum or minimum value measured after you press the MIN/MAX button. Each time the button is pressed, the meter will alternate between MAX and MIN. Press the MIN/MAX button for more than 2 seconds to disable this feature.

HOLD

Freezes the reading present on the LCD at the moment the button is pressed. To use this button feature set up the meter for the type of measurement and range desired before pressing the button.

Backlight

Press the button you enable the display backlight to easy readings in dark environments. Press more than 1 second to disable backlight, which however it automatically OFF after 15 seconds.

Calibration Procedures

Using a standard Acoustic Calibrator (94dB, 1 kHz Sine wave)

1. Set meter for dBA and FAST.
2. Insert the Microphone nozzle carefully into the insertion hole of the calibrator.
3. Press A/C button then press the HOLD button, hold the 2 buttons at the same time more than 1 second. LCD will be blinking to confirm calibration.
4. When LCD blinked, release the A/C and the HOLD buttons. The sound level meter will display 94.0 dBA. The calibration is done.
5. The 94 dB calibration process can be repeated until the meter reads 94.0 dB. Recalibration cycle: 1 year.

SPECIFICATIONS

General

Display: 4 digits LCD

Microphone: 1/2 inch Electret condenser microphone

Low Battery Indication: Replace battery when LCD displays “-+”

Power Supply: 9V NEDA 1604, IEC 6LR61

Power Life : Approx. 50 hrs (alkaline Battery)

Auto Power Off: Approx. 5 min

Environment: Indoor operation, < 2000 m

Temperature / Humidity

Operation: 5°C to 40°C (41°F to 104°F); < 80% RH

Storage: -10^ to 60^ ( 14^ to 140^ ); < 70%RH

Dimension: 200 x 55 x 38 mm (7.8 x 2.2 x 1.5 in)

Weight: 233g. (0.5 lb.) Including battery

Electrical (Audio)

Standard applied: IEC 651 Type2, ANSI 1.4 Type 2.

Dynamic range: 50 dB.

Resolution: 0.1 dB, Display Update: 0.5 sec.

Time weighting: FAST(125mS), SLOW(1 sec).

Frequency range: 31.5 Hz to 8 kHz.

Measuring level range: (Auto Range)

A Weighting: 30 to 130 dB.

C Weighting: 35 to 130 dB.

Accuracy: ± 1.5 dB.

Temperature Coefficient: 0.1dB per °C (<18°C and >28°C)

Calibration cycle: 1 year.

Electromagnetic compatibility (EMC)

International

IEC 61326-1:Portable; CISPR 11:Group 1, Class A.

Group1: Equipment has intentionally generated and/or uses conductively-coupled radio frequency energy that is necessary for the internal function of the equipment itself.

Class A: Equipment is suitable for use in all establishments other than domestic and those directly.

Korea (KCC)

Class A Equipment (Industrial Broadcasting & Communication Equipment)

Class A: Equipment meets requirements for industrial electromagnetic wave equipment and the seller or user should take notice of it. This equipment is intended for use in business environments and not to be used in homes.

MAINTENANCE AND REPAIR

If there appears to be a malfunction during the operation of the meter, the following steps should be performed in order to isolate the cause of the problem.

1. Check the battery. Replace the battery immediately when the symbol “-+” appears on the LCD.
2. Review the operating instructions for possible mistakes in operating procedure.

Except for the replacement of the battery, repair of the meter should be performed only by a Factory Authorized Service Center or by other qualified instrument service personnel. The front panel and case can be cleaned with a mild solution of detergent and water. Apply sparingly with a soft cloth and allow to dry completely before using. Do not use aromatic hydrocarbons or chlorinated solvents for cleaning.

BATTERY REPLACEMENT

1. Turn off the meter and slide out the battery cover. Replace the battery with a NEDA type 1604 (IEC 6LR61) or equivalent 9V alkaline battery. Replace the cover.
2. Remove battery when the Fluke-945 is not used for extended period.

Technical line drawing of a mechanical assembly with two vertical supports and a central opening (no text or symbols)

Battery Replacement