Mastercool 52238 DIGITAL SOUND LEVEL METER User Manual

English

Advertising

Instruction Manual

52238 DIGITAL SOUND LEVEL METER

This sound level meter provides automatic or
manual ranging, 4 measurement ranges from
40 to 130 dB, and features 0.1dB
resolution.

The meter allows you to select

between fast and slow response times as
well as A and C weighting. A maximum hold
function is provided. Jacks on the meter
provide AC analog output.

BUTTON DESCRIPTION

: Power on or power off the meter

RNG: Auto Range/Manual range

��

��

�� 

��
��

��

��

�� 

�
�

��

��

��

��

��

REC: Record Maximum and Minimum sound level
measurement
A/C: A weighting and C weighting
F/S: Response
MAX HOLD: Freeze Maximum sound level reading

MEASURING SOUND LEVELS
Sound levels are displayed both digitally and in a bar
graph. The digital display is updated every 160ms, while
the bar graph is updated every 40ms.
Press the

key to turn the meter on. The unit will ﬁrst

display the full LCD and “188.8” (see Fig. A) then count
down from 99.9 to zero (see Fig B.) The meter will now
begin measuring the current sound levels. SPL (Sound
Pressure Levels) appears on the left side; “A’’, “dB” on
the right side of the LCD. Point the microphone toward
the source of the sound to be measured.

Diagram A

�� 

��
��

��

��

�� 

�
�

��

��

��

��

��

��

��

��

��

��

��

Diagram B

FIG. A

FIG. B

SELECTING THE RESPONSE TIME
You can select a fast or slow response time to suit
different applications and standards. For example, most
OSHA-related testing is done using slow response time
and A weighting. When you turn the meter on, it will be
in fast response mode (see Fig. C.) Press the

F/S key to

toggle between fast and slow response. A small icon,
FAST or SLOW, will be displayed on the top of the LCD to
indicate the current mode (see Fig. D.)

��

�

��

��

��

��

�

��

��

��

��

FIG. C

FIG. D

SELECTING A AND C WEIGHTING
When you turn the meter on, it will be in A weighting
mode. A weighting enables the meter to respond in
the same manner as the human ear, which increases
and decreases amplitude over the frequency spectrum.
Applications for A weighting include OSHA regulatory
testing, environmental measurement, workplace
design, and low enforce-ment.
C weighting is suitable for ﬂat response measurements

with no increase or decrease of amplitude over the fre-
quency spectrum. Applications for C weighting include
the sound level analysis of engines and machinery.
Press the

A/C key to select between A and C weighting.

A small A or C icon will be displayed on the right side of
the LCD to indicate the current mode (see Fig E.)

��

��

��

��

��

�

��

�� 

��

�

��

��

��

��

FIG. E

FIG. F

FREEZING THE MAXIMUM SOUND LEVEL READING
1. Press the

key to turn the meter on.

2. When measuring sound levels, press the

MAX HOLD

key to freeze the maximum reading. MAX HOLD will
be displayed (see Fig F.) The LCD will remain
unchanged until a higher reading is detected. Note
that the bar graph will continue to record the current
reading.
3. Press the

MAX HOLD key again to exit maximum

hold mode.

RECORDING MAX AND MIN MEASUREMENTS
1. Press the

key to turn the meter on.

2. Press the

REC key. The REC icon will be displayed

in the upper left corner of the LCD (see Fig. G.) The
meter will begin tracking the maximum and minimum
sound level measurements.
3. Press the

REC key again. The MIN icon will appear

in the upper middle of the LCD (see Fig. H) and the
minimum sound level measurement will be displayed.
The unit is not recording at this time, but the bar
graph will continue to show the current reading.

��

�

��

��

��

��

��

��

�

��

��

��

��

��

FIG. G

FIG. H

4. Press the

REC key again. MAX will appear on the

LCD by “REC” and the maximum sound level
measurement will be displayed. The unit is not
recording at this time, but the bar graph will continue
to show the current reading.
5. Press the

REC key again to resume recording and

repeat the process.
6. Press and hold the

REC key until the REC indicator

disappears to exit recording mode.

SELECTING AUTOMATIC AND MANUAL RANGING
The meter features 4 measurement ranges in 10dB
steps: 40~70dB, 60~90dB, 80dB~110dB,
100dB~130dB. The meter will be in automatic range
mode when turned on and a small AUTO will be
displayed on the left side of the LCD. In this mode, the
meter will adjust the measurement range automatically
for accuracy. The two digit number to the left of the bar
graph will show the low end of the current range.
The meter will take readings quicker in manual mode,
because the unit does not need to ﬁrst establish the
range before displaying the measurement. This is helpful
when you know the measurement range in advance.
To Adjust The Range Manually:
1. When measuring sound levels, press the

RNG key as

needed to adjust the measurement range. MANU will

appear on the LCD (see Fig I.) Note that the two digit
numbers to the left of the bar graph will change to
reﬂect the low of the newly selected range.
2. Press the

RNG key to return to automatic ranging. If

the meter is operating in manual range and “LO” is
displayed (see Fig J), the sound is too low. If “HI” is
displayed, the sound is too loud. In either case, you
must adjust the measurement range or your readings
will be inaccurate.

��

�

��

��

��

��

��

��

�

��

��

��

��

FIG. I

FIG. J

AUTOMATIC SHUTOFF
The meter will turn off automatically after 20 minutes to
preserve the battery. To override this feature:
1. Make sure the unit is turned off.
2. Press the

and

MAX HOLD keys simultaneously.

3. When the full display appears, release the

button,

when the “

Π” icon appears on the LCD, release the

MAX HOLD key, “

Π” will be replaced with the full

display (see Fig. K.)
4. The meter will remain on until the

key is pressed

again. The automatic shutoff feature will resume the
next time the meter is turned on.

FIG. K

FIG. L

REPLACING THE BATTERY
When the “

” icon appears, the 9V battery has fallen

to a critically low voltage level and should be replaced.
Use a screwdriver to unscrew the back battery compart-
ment cover (see Fig. L). Insert a fresh 9V battery and
screw the cover back on.

CE CERTIFICATION
The meter conforms to the following standards:
EN 50081-1/1992 : EN 55022
EN 50082-1/1997 : (EN 61000-4-2/-3/-8,ENV 50204)
The meter complies with the essential protection
requirements of Council Directive 89/336/EEC on the
approximation of the laws of the Member States relating
to electromagnetic compatibility.

WARRANTY
This product warrants against defects in material and
workmanship for a period of one year. This warranty
does not cover failure due to abuse, improper usage, or
progressive wear and tear. Warranty becomes valid to
the original user, effective on the purchase date. A copy
of an invoice must be sent to 1 Aspen Drive, Randolph,
NJ 07869 to validate the warranty. For further service
please contact (973) 252-9119.

ENGLISH

USA: PH (973) 252-9119

BELGIUM: TEL. + 32 (0) 3 777 28 48

www.mastercool.com

➀

➁

➂

Advertising

Popular Brands

Popular manuals