B+K precision 732A User manual

Model: 732A, 735

Digital Sound Level Meter

USER MANUAL

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CONTENTS

Title P age

I. SAFETY INFORMATION………..……….………….. 1

Environment conditions…………………………….....1

Maintenance & Clearing……………………………….1

Safety symbols………………………………………… 1

II. GENERAL DESCRIPTION……………………..…….. 2

III. SPECIFICATIONS..…………………..……………….. 2

IV. NAME AND FUNCTIONS..………….……………….. 5

V. CLOCK & INTV SETUP……….……………….……… 6

DataLogger…………………………………………….. 6

Clock Setup……………………………………………...6

Recording Interval Setup………………………………7

Auto Power Off………………………………………… .7

VI. CALIBRATION PROCEDURES….………………….. 7

VII . MEASUREMENT PREPARATION………….………. 8

VIII. OPERATING PRECAUTIONS………………………. 8

IX. MEASUREMENT………….………………………..… 9

X. Setup TestLink AK-73X (Sound Level Meter)

—

RS232 interface software……………………..….…...9

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I. SAFETY INFORMATION

Read t he f ollowing s afety information c arefully b efore at tempting t o oper ate or

service the meter.

Use the meter only as specified in this manual; otherwise, the protection provided

by the meter may be impaired.

Environment conditions

 Altitude up to 2000 meters

 Relatively humidity 90% max.

 Operation Ambient 0° ~ 40°C

Maintenance & Clearing

 Repairs or s ervicing n ot c overed i n t his m anual s hould o nly be p erformed b y

qualified personnel.

 Periodically wipe the case with a dry cloth. Do not use abrasives or solvents on

this instruments.

Safety symbols

Comply with EMC

When servicing, use only specified replacement parts.

II. GENERAL DESCRIPTION

Thank you for using our Data Logger Sound Level Meter. To ensure that you can

get the most from it, we recommend that you read and follow the manual carefully

before use.

This unit conforms to the IEC651 type2, ANSI S1.4 Type2 for Sound Level Meters.

This D ata Lo gger Sound Level Meter i nternal m emory c an k eep up t o 32 000

records.

(Note 1.)

It uses RS232 interface to perform bi-directional communication with PC.

Note1 (model 735):

Press “REC” t o begin recording, press “ REC” agai n to stop r ecording. The dat a will be l oaded i nto

the memory until it is full.

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III. SPECIFICATIONS

Standard applied: IEC651 Type2, ANSI S1.4 Type2.

Frequency range: 31.5Hz ~ 8KHz

Measuring level range: 30 ~ 130dB

Frequency weighting: A / C

Microphone: 1/2 inch electret condenser microphone

Display: LCD

Digital display: 4 digits

Resolution: 0.1dB

Display Update: 0.5 sec.

Analog display: 50 segment bargraph

Resolution: 1dB

Display Update: 50 mS

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

Level ranges: Lo: 30 – 80 dB

Med: 50 – 100 dB

Hi: 80 – 130 dB

Auto: 30 – 130 dB

Accuracy: ±1.5dB (under reference conditions @ 94dB, 1KHz)

Dynamic range: 100 dB (50 dB model 732A)

Alarm function: “OVER” is when input is more than the upper limit of range.

“ UNDER ” is when input is less than the lower limit of range.

MAX/MIN hold: Holds readings the Maximum and Minimum Value.

AC output: 1 Vrms at FS (full scale).

Output impedance: Approx. 100Ω

FS: means the upper limit of each level range.

DC output: 10mV / dB, output impedance approx. 1KΩ

Power supply: One 9V battery, 006P or IEC 6F22 or NEDA 1604.

Power life: About 50hrs (alkaline battery)

AC adapter: Voltage 9 VDC, center pin negative, (8-15VDC Max)

Supply current : > 30mADC Socket : pin → Ground

Casing → Positive E xternal Diameter → 3.5mm

Internal Diameter → 1.35mm

Electromagnetic Compatibility:

RF field = 3V/m

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Total accuracy = specified accuracy + 0.5dB

Operation temperature: 0 to 40°C (32° to 104°F)

Operation humidity: 10° to 90%RH

Storage temperature: -10° to 60°C (14° to 140°F)

Storage humidity: 10 to 75%RH

Dimensions (L x W x H): 10.8 ×2.5 ×1.2inch (275 ×64 ×30mm)

Weight: 285g (including battery)

Accessories: 9V battery, carrying case, Screwdriver, Instruction manual.

Windscreen, 3.5 ψplug, software & RS-232 cable (optional

model 732A).

IV. NAME AND FUNCTIONS

OPEN

MANUAL FOR SAFETY

NEDA 1604 6F22 006P

PLEASE READ

9V BATTERY

RS-232

CAL

OUTPUT

DC 9V

SETUP

POWER-UP OPTIONS

30Lo =

Med=

Auto=

Hi = 50

REC

MAX

MIN

CLOCK

80 dB

100 dB

130 dB

LEVEL

SLOW

INTV

FAST

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○

1 Windscreen

If you operate at wind speed over 10m/sec, please put protective accessories

in front of the microphone.

○

2Display

SYMBOL FUNCTION

LCD 4 digits

MAX Max imum indication

MIN Mi nimum indication

Over range

Under range

FAST F ast response

SLOW Sl ow response

dBA A-Weighting

dBC C -Weighting

Range Indicate

Low-Battery

Under range 20dB

Following items for model 735

AUTO A uto Level range selective

REC Recording Datalogger

FULL Memory full

Auto Power OFF active

○

3Power & Backlight button

The

○

I key turns the sound level meter ON or OFF and backlight ON & OFF.

Press it once to turn on the sound level meter.

Press it again for moment to turn ON or OFF backlight.

Press and hold this button 3 seconds to turn the unit OFF.

Note: When the user powers it on, the LCD will show how much memory space

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is available to use (model 735).

○

4MAX / MIN hold button

Press button to enter the maximum and minimum recording mode. Select

the proper Level range before using MAX/MIN to ensure that reading value will

not ex ceed t he measurement range. P ress once to s elect MA X v alue. P ress

again to select MIN value, and press again to select current value with “ MAX

MIN “ annunciator will begin to blink.

Press and hold down button for 2 seconds to exit the MAX MIN mode.

Note: If you change s ound l evel r ange or c hange A-C weight, t he M AX.MIN

mode will clear.

○

5Record Datalogger button (model 735)

When you press the button, the meter will begin recording. The “REC”

annunciator will be displayed, press again and it will stop recording.

○

6Frequency Weighting select button

A: A - Weighting. Used for general sound level measurements.

C: C - Weighting. Used for checking the low-frequency content of noise.

(If the C-Weighted level is much higher than the A-weighted level, then there is

a large amount of low-frequency noise)

○

7Time weighting select button

FAST: for normal measurements

SLOW: for checking average level of fluctuating noise.

○

8Level range control button

Each time you press the button, the level range will change between “Lo”

level, “Med” level, “Hi” level and “Auto” level.

○

9Microphone

1/2 inch Electret Condenser microphone

○

10 CAL potentiometer

Is used for calibration adjustment.

○

11 RS-232 Interface:

The RS-232 signal output is a 9600 bps N 8 1 serial interface.

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DC Signal

AC Signal Ground

○

12 Signal output terminal

AC: 1 Vrms Corresponding to each range step.

Output impedance ≒ 100Ω

Output signal by standard 3.5mm coaxial socket signal.

Note: At “Auto” level range, output signal is Auto select on “Lo” or “Med” or

“Hi” level range.

DC: Output: 10mV/dB

Output impedance = 1KΩ

The output signal is sent by standard 3.5mm coaxial socket signal.

○

13 External DC 9V power supply terminal

Allows for an external AC adapter.

○

14 Tripod mounting screw.

○

15 Battery Cover

V. DATA LOGGER CLOCK & INTERVAL SETUP

(Model 735 Only)

 DataLogger:

When you pr ess t he " REC" but ton, t he m eter w ill begin

recording, and pr essing the "REC" but ton aga in w ill s top

recording, If you want to clear the memory, power off the

meter, t hen press and ho ld t he “ REC” b utton and t hen

press power button and hold it for at least 5 seconds, then

LCD will show "CLR" and “SURE” to clear the memory.

 Clock Setup:

1: pr ess an d hold the “ A/C” but ton a nd t hen power o n t he

meter:

2: press “MAX MIN”(clock) button:

3: pr ess " REC" ▲ or " LEVEL"

▼

to i ncrease or decrease

number, pr ess “ MAX MIN”(clock) t o adj ust nex t i tem. T he

adjusting order i s year→month→day→hour→minute, t hen

press “ MAX MIN” (clock) t o f inish adjusting. I f you want t o

abort during a setup process, press power button to cancel.

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POWER-UP OPTIONS

Med= 50

Auto=

Hi = 80

REC

Lo = 30 100 dB

130 dB

80 dB

LEVEL

SETUP

MIN

CLOCK

MAX

INTV

SLOW

FAST

OUTPUT

DC 9V CAL

RS-232

 Recording Interval Setup:

1: P ress and h old t he “ A/C” but ton and t hen p ower on t he

meter:

2: Press “FAST/SLOW"(INTV) button:

3: P ress "REC" ▲ or " LEVEL"

▼

to i ncrease or dec rease

number, pr ess “ FAST/SLOW " (INTV) t o adj ust nex t i tem,

then pr ess “ FAST/SLOW” (INTV) t o finish. I f you want t o

abort during a s etup pr ocess, pr ess t he power but ton t o

cancel.

 Auto Power Off:

When the meter is turned on the default auto power off is enabled. The meter

will po wer i tself of f a fter 30 minutes i f no k eys are pressed and n o R S232

communication is established.

To disable the auto power off feature, press and hold the “FAST/SLOW” button

while using the on/off button to turn the unit on. Once this is done you will no

longer see the symbol on the display.

VI. CALIBRATION PROCEDURES

 Using a standard Acoustic Calibrator B&K

model CAL73 ( 94dB , 1KHz Sine wave )

(1) Make the following switch settings.

Display: dBA

Acoustic Calibrator

Screwdriver

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Time weighting: FAST

Measurement mode: MAX MIN Mode function disable.

Level range: 50 to 100dB

(2) Insert t he m icrophone h ousing c arefully into t he i nsertion ho le of t he

calibrator.

(3) Turn on the switch of calibrator and adjust the CAL potentiometer of the unit.

The level display will indicate the desired level .

All products are well calibrated before shipment.

Recommended Recalibration cycle : 1 year.

VII. MEASUREMENT PREPARATION

(1) Battery Loading

Remove the battery cover on the back and put in one 9V Battery.

(2) Battery Replacement

When the battery voltage drops below the operating voltage, this symbol will

appear . Replace 9 Volt battery.

(3) AC Adapter Connection

When the AC adapter is used, insert the plugs of the adapter into the DC 9V

connector on the side panel.

VIII. OPERATING PRECAUTIONS

(1) Wind blowing across the microphone would bring additional noise.

When us ing the i nstrument i n t he pr esence of wind, a lways us e t he

windscreen to eliminate unwanted noise.

(2) Calibrate the instrument before operation if the instrument was not in use for

a long period of time.

(3) Do not store or operate the instrument at high temperature and high humidity

environment.

(4) Keep the microphone dry and avoid severe vibration.

(5) Please t ake out t he ba ttery and keep t he i nstrument i n a l ow humidity

environment when not in use.

IX. MEASUREMENT

(1) Open battery cover and install a 9V battery in the battery compartment.

(2) Turn pow er on and s elect t he d esired r esponse T ime and Weighting. I f t he

sound source consists of short bursts or only catching sound peak, set

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