B&K Precision 732A User Manual

CONTENTS

Title Page

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

I. SAFETY INFORMATION

Read the following safety information carefully before attempting to operate 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 servicing not covered in this manual should only be performed by
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 Data Logger Sound Level Meter internal memory can keep up to 32000

records.
(Note 1.)
It uses RS232 interface to perform bi -directional communication with PC.

Note1 (model 735):

Press “REC” to begin recording, press “REC” again to stop recording. The data will be loaded into
the memory until it is full.

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

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.

MAX/MIN hold: Holds readings the Maximum and Minimum Value.
AC output: 1 Vrms at FS (full scale).

Output impedance: Approx. 100O

FS: means the upper limit of each level range.
DC output: 10mV / dB, output impedance approx. 1K O
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 External Diameter ? 3.5mm
Internal Diameter ? 1.35mm

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Electromagnetic Compatibility:

RF field = 3V/m

Total accuracy = specified accur acy + 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? plug, software & RS-232 cable (optional
model 732A).

Specifications and information subject to change without notice. Please visit

www.bkprecision.com for the most current product information.

IV. NAME AND FUNCTIONS

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9

2

3

4

5

SETUP

MAX

MIN

CLOCK

REC

30Lo =

Med=

50

Hi =

80

Auto=

30

POWER-UP OPTIONS

80 dB
100 dB
130 dB
130 dB

FAST

SLOW

LEVEL

INTV

6

CA

7

8

CAL

RS-232

OUTPUT

DC 9V

9V BATTERY

NEDA 1604 6F22 006P

PLEASE READ

MANUAL FOR SAFETY

OPEN

3

?1 Windscreen

If you operate at wind speed over 10m/sec, please put protective accessories
in front of the microphone.

?2 Display

SYMBOL FUNCTION

LCD 4 digits
MAX Maximum indication

MIN Minimum indication
Over range
Under range
FAST Fast response
SLOW Slow response
dBA A-Weighting
dBC C-Weighting
Range Indicate
Low-Battery

Under range 20dB

Following items for model 735

AUTO Auto Level range selective

REC Recording Datalogger

FULL Memory full

Auto Power OFF active

?3 Power & 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.

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Note: When the user powers it on, the LCD will show how much memory space
is available to use (model 735).

?4 MAX / 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 exceed the measurement range. Press once to select MAX value. Press
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 sound level range or change A-C weight, the MAX.MIN

mode will clear.

?5 Record 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.

?6 Frequency 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)

?7 Time weighting select button

FAST: for normal measurements
SLOW: for checking average level of fluctuating noise.

?8 Level range control button
Each time you press the button, the level range will change between “Lo”

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

?9 Microphone
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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