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Exhaust Noise Inspector Type 3638 – User Manual
The following specifications apply to both types of Exhaust Noise Inspector used with a Type 2238 Sound Level
Meter, fitted with the supplied microphone, preamplifier and extension cable.
Note: Specifications that apply only to the sound level meter are shown in italics .
STANDARDS
Conforms with the following:
• IEC/EN 61672 – 1:2002 Class 1
• IEC 60651 Type 1, 1979 & Amendment 1 1993 &
Amendment 2 2000
• EN 60651 Type 1
• EN 60804 Type 1
• ANSI S1.4 – 1983 Type S1
• ANSI S1.43 – 1997 Type 1
• Measurements of exhaust sound levels emitted by
stationary road vehicles according to ISO 5130 and
70/157/EEC standards:
• ISO 5130:1982 (under revision)
• SAE J 492: 1998-05, Measurement of Light Vehicle
Stationary Exhaust System Sound Level Engine
Sweep Method
• SAE J 297: 1998-07, Measurement of Exhaust
Sound Levels of Stationary Motorcycles
NATIONAL LEGISLATION
• Germany: DIN ISO 5130 Methode für die Messung
des Standgeräusches von Straßenfahrzeugen; 70/
157EWG, 2/97/EWG, 96/20/EG, ECE-R 63, 78/1015/
EWG, 97/24/EG, 1999/101/EC
• France: Arrêté du 18 juillet 1985 relatif au contrôle
au point fixe du niveau sonore des véhicules; 70/
157/EEC
MICROPHONE
Type 4188 Prepolarized Free-field 1/2 " Condenser
Microphone
Nominal Sensitivity: –30 dB re 1 V/Pa or 31.6 mV/Pa
Frequency Range: 8 Hz to 16 kHz ± 2 dB
Capacitance: 12 pF
MICROPHONE PREAMPLIFIER
Type ZC 0030 Input Preamplifier
EXTENSION CABLE
Length: 5 m
MEASUREMENT RANGES
Dynamic range – automatic setup of the measurement
range by the controller unit as follows:
Type 2238: 80 dB, set to the range of 40 to 140 dB,
which gives optimal amplitude amplification and best
S/N ratio
Type 2239 A: 70 dB, set to the range of 50 to 120 dB,
which gives optimal amplitude amplification and best
S/N ratio
RPM MEASUREMENT RANGE
• 2 or 4 stroke
• Number of cylinders: 1, 2, 3, 4, 5, 6, 8, 10, 12
• 200 < RPM measurement capabilities < 13000 for
1, 2, 3, 4 cylinders
• 200 < RPM measurement capabilities < 7000 for 5,
6, 8, 10, 12 cylinders
Accuracy: better than 2%
SOUND LEVEL METER REMOTE CONTROL
The controller automatically manages the sound level
meter (Type 2238 or 2239 A) from startup via the RS –
232 interface. Setup, autorange, measurements and
measured values are set and monitored according to
the above standards.
TACHOMETER CONNECTION
'Plug and play'
DISPLAY
Digital Display: 4 lines back-lit LCD, which shows:
• Display of RPM (from internal or external tachome-
ter) and SPL (from sound level meter)
• SPL
of the previous measurements
max
• Remaining measurement time
• Warning for overload
• Warning for low battery power
• Menus for displaying and editing measurement and
advanced system setups
• All relevant indications during calibration procedure
LED display:
• Right red light: indication of above RPM values for
throttle pedal setup
• Middle green light: OK
• Left red light: indication of under RPM values for
throttle pedal setup
CALIBRATION
Automatic, using Sound Level Calibrator Type 4231,
via the sound level meter menu
PRINTER
Measurement data are automatically printed (in
chosen language), or manually selected via the main
menu. Data consists of the following:
• Engine speed (RPM)
• Number of cylinders
• Engine type: 2 stroke or 4 stroke
• Measurement date and time
• Defined RPM
• Measurement values in dB(A): 1 to 3 values
• Criteria level in dB(A)
• L
or L
value in dB(A)
Aeq
max
• Pass/Fail result
• Space for additional comments (3 blank lines)
• Sound level meter serial number
TIME
Real-time clock/calendar
TACHOMETER INTERFACE AND CABLING
External tachometer cable for connection to the
system on controller front panel (optional)
Length: 4 m
SETTLING TIME
From Power-on: < 20 s
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