BRUEL & KJAER 4448 Manual de usuario

1. Check contents and Symbol Key.

(See OVERVIEW)

2. Fully charge Type 4448 unit(s).

(See CHARGE)

3. Turn on the unit(s).

(See TURN ON AND OFF)

4. Conﬁgure unit(s) to desired use

parameters.

(See CONFIGURE AT STARTUP)

5. Calibrate unit(s).

(See CALIBRATE)

6. Mount units on the subject.

Optional: Change mounting clips.

(See MOUNT)

7. Perform the measurements.

(See MEASUREMENT CONTROL)

8. Access and review your data.

(See REVIEW MEASUREMENT DATA and

DOWNLOAD DATA TO A PC)

First Use

English

NOTE: Consult Type 4448 User Manual for safety information

2 3

Overview Charge

To Charge Type 4448

Place the unit on the provided charger.

Full charging from ﬂat will take

approximately 90 minutes.

Charging: Flashing red light.

Charged: Constant blue light.

Ensure that Type 4448 has enough

charge for the required measurement

duration by looking at the screen,

which will show the run time available

for the current charge.

To Link Chargers

Link the chargers using cable AO-1493

then connect power supply ZG-0864 to

a charger with a free AC input (any AC

input is ﬁne).

The power supply can drive a chain of

up to four chargers.

Left Key

Right Key

Status Indicator

Display

Windshield

Infrared Sensor

Symbol key Press once

Press and hold

Press multiple times

(example shows three times)

English

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tUrn On and OFF

To Turn On Type 4448

Press the Left (L) key. Type 4448 will run through

a start-up sequence.

The ﬁrst screen displays model number and

ﬁrmware version. The second screen shows user

deﬁned text (can be conﬁgured using Type 7825

Protector).

After startup, the instrument enters stand-by

mode, alternatingly showing time and date and

(if available) data from the last run.

To Turn Off Type 4448

Hold down the ‘L’ key for 3 seconds.

COnFigUratiOn at startUp

To Enter Conﬁguration

Mode

To Change Value To Select Parameter

Press and hold the ‘R’

key during startup.

Parameters

CONTRAST

LANGUAGE

PRO. MODE

DISPLAY MODE

dB ALARMS

PRESET MODE

AUTO

CLEAR MEMORY

Press the ‘L’ key to

change the parameter

value.

Press the ‘R’ key to

conﬁrm the value

and move to the next

parameter.

Conﬁrming the ﬁnal

screen returns the unit

to standard operation.

English

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3 sec

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NOTE: If the memory is to be cleared, a second

screen appears for conﬁrmation. Change the option

to ‘Yes’ by pressing the ‘L’ key, then press ‘R’ to

conﬁrm deletion.

6 7

To Calibrate Type 4448

1. Switch on Type 4448 and wait for it

to start up.

2. Remove windshield

(Important: see WINDSHIELD)

3. Place the acoustic calibrator

over the microphone as shown

to the left. Be careful to push

the calibrator straight onto Type

4448 without twisting, since this

might loosen or over tighten the

microphone capsule.

4. Turn on the calibrator. Type

4448 automatically recognises

calibration tones and enters

calibration mode.

5. Press the ‘R’ key to conﬁrm that

you wish to calibrate. Type 4448

will take a few seconds to automat-

ically adjust to the required level.

Once calibration is completed, a ‘CAL

OK’ message will appear. Type 4448

stores the calibration date, time and

level then returns to the default

screens.

CalibratiOn

NOTE: By default Type 4448

is set up for a calibration level

of 94dB. You can change this

using PC Software Type 7825

Protector (for more details see

Type 7825 Online Help and

Type 4448 User Manual).

To Remove the Windshield

Twist the black plastic ring

(not the foam) counter-

clockwise and lift it off.

To Attach the Windshield

Place the tabs into the slots

then gently twist the black

plastic ring (not the foam)

clockwise.

windshield

NOTE: When attaching or removing the windshield always hold and twist using the

black plastic ring at the base of the windshield: Never use the foam.

English

8 9

MeasUreMent COntrOl

To Start a Measurement To Lock and Unlock Keys and

Display during Measurement

Press and hold both keys for 3

seconds; a countdown will be

displayed on screen.

During a measurement, ►will be

displayed in the top left of the screen.

The screen will then cycle between

the dB level, measurement duration

and the memory/battery status.

To Stop a Measurement

Press and hold both keys for 3

seconds; a countdown will be

displayed on screen.

Hold the ‘R’ key down and press the

‘L’ key 3 times. A padlock symbol will

appear. The keys are now locked, and

dB values will be hidden.

To unlock the keys, hold the ‘R’ key

down and press the ‘L’ key 3 times.

Pre-set Measurement Time

When using preset measurement

time, the unit can enter locked mode

(optional) during measurement. The

measurement will stop at the set

time.

To stop the measurement in advance,

unlock Type 4448 as described above.

To Mount the Units

1. Select the correct clips for the

application (more or less intense

physical activity, environment and

subject’s clothing requirements). For

example, pins provide a stronger bond

but penetrate protective materials.

2. Place the instrument on the shoulder

ensuring that the microphone points

upwards and that the microphone tip

is about 10 cm from the ear.

For more mounting information,

see manual.

To Remove or Switch Mounting Clips

1. Locate and remove the screws

(see image) and lift off the clips.

2. Place the tabs of the new clips into the

holes, gently push the clips into place

and insert and tighten the screws.

MOUnt

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3 sec 3 sec

10 11

To Download Data to a PC

1. Ensure the infra-red download

adaptor (AO-1492) is connected to

the USB port of your PC and Type

4448 is sufﬁciently charged.

2. Start Type 7825 Protector software

on the PC and Type 4448.

3. Hold Type 4448’s infra-red port near

to and facing the PC’s infra-red

adaptor.

4. Start download sequence within

Type 7825 Protector and follow

instructions for downloading data.

Error Messages

If any error messages occur during

the procedures described in this ﬁeld

guide, please refer to Troubleshooting

in the Type 4448 User Manual.

A ﬂashing red LED indicates either low

battery or memory.

dOwnlOad data tO pCreview MeasUreMent data

When Type 4448 is not measuring, the

screen will cycle through status information

and data from the previous measurement

run. The data displayed will depend on the

conﬁguration of Type 4448, either ISO or

OSHA data. The data shown is displayed to

the left.

To Freeze the Display

Press the ‘R’ key on any of these screens and

the display will freeze for 10 seconds and

then resume.

ISO OSHA

10Hrs

MEMORY 80Hrs

13:45:03

LAF 112.3 dB

DURATION

07:45:12

LAEQ 89.9

LCPK 101.4 dB

PA2Hrs

3.20

PROJ DOSE

352.5 %

13:45:03

LAS 109.3 dB

DURATION

07:45:12

LAVG 111.4

LZPK 119.4 dB

OSHA DOSE

4.3 %

PROJ DOSE

352.5 %

10Hrs

MEMORY 80Hrs

 

English



BATTERY LIFE

28 hours

TIME HISTORY / MEMORY CAPACITY

180 hours with 1 minute logging period

PRESET MEASUREMENT TIME

00:00–12:00 in 30-minute steps

MEASURING RANGE

Linear Operating Range: 65.0 – 140.3dB (RMS)

Peak Measurement Range: 95.0 – 143.3dB (Peak)

OPERATING TEMPERATURE

0 to +40°C

HUMIDITY

30% – 95% RH (non-condensing)

Field speCiFiCatiOns

1. Inhalt kontrollieren und Symbol-

erklärung lesen.

(Siehe ÜBERSICHT)

2. Typ 4448-Gerät(e) voll auﬂaden.

(Siehe LADEN)

3. Geräte(e) einschalten.

(Siehe EIN- UND AUSSCHALTEN)

4. Die gewünschten Parameter einstellen.

(Siehe KONFIGURATION BEIM START)

5. Gerät(e) kalibrieren.

(Siehe KALIBRIERUNG)

6. Gerät an der Person befestigen.

Optional: Befestigungsclip wechseln.

(Siehe BEFESTIGUNG)

7. Messungen durchführen.

(Siehe MESS-STEUERUNG)

8. Daten betrachten und übertragen.

(Siehe MESSDATEN BETRACHTEN und

DATENÜBERTRAGUNG ZUM PC)

erster einsatz

Deutsch

HINWEIS: Sicherheitshinweise siehe Bedienungshandbuch für Typ 4448.

14 15

ÜbersiCht laden

Typ 4448 auﬂaden

Das Gerät auf das mitgelieferte

Ladegerät setzen. Volles Auﬂaden aus

dem entladenen Zustand dauert ca. 90

Minuten.

Beim Laden: Rotes Blinklicht.

Voll geladen: Blaues Dauerlicht.

Dafür sorgen, dass Typ 4448 für die

gewünschte Messdauer ausreichend

geladen ist. Auf dem Display wird die

für den derzeitigen

Ladezustand verfügbare

Messzeit angezeigt.

Ladegeräte verbinden

Die Ladegeräte mit Kabel AO-1493

verbinden und das Netzteil ZG-0864 an

ein Ladegerät mit freiem AC-Eingang

anschließen (jeder AC-Eingang ist

geeignet).

Das Netzteil kann bis zu vier

Ladegeräte in Reihe versorgen.

Deutsch

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Linke Taste

Rechte Taste

Statusanzeige

Display

Windschirm

Infrarotsensor

Symbolerklärung Einmal drücken

Drücken und halten

Mehrmals drücken

(im Beispiel dreimal)

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