BRUEL & KJAER 4448 User manual

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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
Copyright © Brüel & Kjær. All rights reserved.
English
NOTE: Consult Type 4448 User Manual for safety information

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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.
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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.

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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

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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

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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
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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

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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.

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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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