ตัวอย่างเครื่องมือที่ให้บริการสอบเทียบสาขาเสียง (บางส่วน).
สอบถามรายละเอียดเพิ่มเติม ได้ที่ 02-316-3362 หรือcal@metrology.co.th
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เครื่องมือมาตรฐาน สอบเทียบสาขาเสียง และการสั่นสะเทือน (บางส่วน)
Bruel & Kjaer 4134 with adaptor UA-0825 (ทางห้องปฎิบัติการฯ มีถึง 2 ชุด)
Traceable to National Institule of Metrology (Thailand):NIMT
4134 1/2″ Pressure-field Microphone, 200V Polarization
Type 4134 is specially designed for infrasound measurement. Being external polarized, Type 4134 must be used with a classical preamplifier. When used with adaptor UC-0211, the lower limiting frequency of the preamplifier is reduced to 0.1 Hz
Specifications
Capacitance 18 pF
Diameter 1/2 inch
Dyn. Range 20.7 – 161 dB
Freq. Range 0.07 – 20000 Hz
Inherent Noise 19 dB A
Lower Limiting Frequency -3dB Hz
Optimised Low Frequency
Polarization Ext. polarized
Polarisation Voltage 200 V
Preamplifier Included Yes
Pressure Coefficient –0.005 dB/kPa
Sensitivity 12.5 mV/Pa
Standards IEC 61094-4 WS2P
ANSI S1.4 Type 1
TEDS UTID
Temperature Coefficient -0.002 dB/ºC
Temperature Range -30 – 300 ºC (-22.0 – 572.0 °F)
Venting Side
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Bruel & Kjaer 4144: 1″ Pressure-field Microphone
USES
• Coupler measurements
• Audiometer calibration
• Low-frequency, low-level measurements
• Laboratory standard microphone
FEATURES
• Sensitivity: 50mV/Pa
• Frequency: 2.6Hz to 8 kHz
• Dynamic Range: 10 to 146 dB
• Temperature: –30 to 100°C (–22 to 212°C)
• Polarization: 200 V external
Description
Type 4144 is a 1″ pressure-field microphone, that is, a
microphone where the damping of the diaphragm is such
that the pressure frequency response is flat over a wide
frequency range. Hence no correction is needed to the
pressure response below 8 kHz. The use of pressure-field
microphones is recommended where measurement of the
local pressure is of interest, for instance for coupler meas-
urements or measurements at walls or surfaces. The ex-
cellent stability of Type 4144 combined with its low
inherent noise and high sensitivity makes it the perfect
choice for coupler measurements and other laboratory
type measurements
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Bruel & Kjaer 4145: 1″ Free-field Microphone
USES
• Low-level measurements
• Laboratory measurements
FEATURES
• Sensitivity: 50mV/Pa
• Frequency: 2.6Hz to 18 kHz
• Dynamic Range: 10 to 146 dB
• Temperature: –30 to 100°C (–22 to 212°C)
• Polarization: 200 V external
• Complies with IEC61094–4WS1F
Description
Type 4145 is a 1″ free-field microphone designed for low-
level and laboratory free-field measurements. The speci-
fications of Type 4145 also make it suitable for sound
pressure measurements in accordance with IEC 61672
class 1. When fitted with Random Incidence Corrector
UA0055, Type 4145 can also be used for random-inci-
dence measurements.
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Bruel & Kjaer 4135: 1/4″ Condenser Microphone
USES:
General high-level,high-frequency measurements and model work
FREQUENCY RESPONSE CHARACTERISTIC:
Free-field and Random
OPEN CIRCUIT FREQUENCY RESPONSE*:
0° incidence free-field response:
4Hz to 100kHz: ±2dB
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Bruel & Kjaer 4133: 1/2″ Free-field, 0° incidence Microphone
TYPICAL USES:
General electroacoustic purposes, loudspeaker
and microphone measurements
FREQUENCY RESPONSE
CHARACTERISTIC:
Free-field, 0° incidence
OPEN CIRCUIT FREQUENCY RESPONSE*:
0° incidence free-field response:
4Hz to 40 kHz: ±2 dB
In accordance with IEC651 Type 0, Type 1 and
ANSI S1.12, Type M
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The Bruel & Kjaer 2610
The Bruel & Kjaer 2610 Measuring Amplifier covers the frequency range from 2Hz to 200kHz. Voltage range from 10 µV to 30 V FSD. Amplification from +100 to -30 dB.
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Bruel & kjaer
Battery Driven Power Supply — Type 2804
USES:
Field measurements of Sound and vibration
Field recording of data
Measurements of Sound insulation
Traffic noise measurements
FEATURES:
Two identical channels
Cross switching between inputs and outputs
200 V, 28 V or 0 V polarization voltage supply for condenser microphones
Fits Brüel& Kjær modular cassette system for rack mounting
Standard 1.5 V dry cells
Meter indication of battery condition
Two 28 V 10 – 32UNF Microdot sockets for preamplifiers
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Genaral Radio Model 1564-A:Sound and Vibration Analyzer
The General Radio 1564A Sound/Vibration Analyzer operates in the frequency range
of 2.5Hz to 25kHz in four decades. 25 Mohms input impedance in parallel with 80 pF.
Input range of 0.3 mV to 30 V full scale. Output: 1 V open circuit. Three scales:
0 to 3 V, 0 to 10 V, -6 to +10 dB. AC or battery operated. Unit comes with 2 microphones.
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Genrad 1982 Type 1 Sound-Level Meter & Analyzer
⦁ Digital and analog displays
⦁ Digital display captures and holds maximum sound level for accurate readings
⦁ 50-dB analog meter scale has 1-dB linear calibration
⦁ Measurement Range:
*Sound Level Range: 30 to 130 dBA in four 50-dB switch-selectable ranges.
*Frequency Response: A, B, and C weighting; 10 octave-band filters ranging from 31.5 Hz to 16 kHz; FLAT response 10 Hz to 20kHz
*Dynamics: Fast, slow, impulse (per IEC651) and absolute peak, switch selected
⦁ Displays:
*Analog: Meter 3-in. scale, 30 to 80, 50 to 100, 70 to 120 and 90 to 140 dBA
*Digital Readout: 4-digit with decimal point
⦁ Outputs:
*AC Output: Weighted, 400 mV nominal full scale
*DC Output: Approx. 60 mV/dB, linear, 3 V nominal full scale.
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