46BG ¼" CCP Pressure Microphone Set, High Levels
Product Data
Vers. 25 January 2013
The G.R.A.S. 46BG is a ¼" CCP high-quality,
high pressure microphone set with built-in CCP
preamplifier and Microdot coaxial connector. The
microphone is made according to the IEC 61094
standard for measurement microphones.
• It has a very wide dynamic range – from 60
dB(A) to 180 dB – and is especially designed
for accurate measurements of high noise levels
and impulse noise.
• It can withstand high temperatures – up to
100 °C. This makes it the ideal choice for hightemperature applications.
The G.R.A.S. 46BG can be connected directly
to all professional measurement systems with a
CCP input.
If your measurement platform supports intelligent
transducers according to IEEE 1451.4 (TEDS),
you can simply plug in the set and it will identify
itself with its specific properties, type and calibration data. A feature especially appreciated by
multi-channel users.
It is made from non-corrosive, stainless materials
and can withstand rough handling and corrosive
environments.
The set is assembled in a dust-free environment
to avoid contamination of the interface between
the microphone and preamplifier and has been
sealed with a label. The label can be removed
and the set dismantled, if desired by the user.
Before leaving the factory, the microphone set
has been tested and calibrated by G.R.A.S., and
an individual test certificate is included. The calibration information is also stored in the built-in
TEDS.
Please note that cables must be ordered seperately.
G. R . A . S.
SOUND & VIBRATION
Fig 1. The 46BG ¼" CCP Pressure Microphone Set,
high levels
Main Features
• A wide dynamic range topping at 180 dB
• Designed for use in hot environments – up to 100 °C
• Compact size adds flexibility to application designs
• Built-in TEDS (supports IEEE 1451.4)
Typical Applications
• High-pressure noise measurements
• Noise measurements with artillery
• Noise measurements at jet engines, turbines, and
rocket engines
• Measurements in very high-temperature environments
Skovlytoften 33,
2840 Holte, Denmark
www.gras.dk – gras@gras.dk
46BG ¼” CCP Pressure Microphone Set, High Levels
2
2
Amplitude [dB rek 20 µPa]
0
0
-2
-2
-4
-4
-6
-6
-8
-8
-10
-10
-12
-12
100
100
1000
1000
Frequency [Hz]
10000
10000
100000
100000
Fig 2. Typical pressure frequency response of the 46BG.
Specifications and Accessories
Frequency response
3.15 Hz – 70 kHz.............................. ±2.0 dB
5 Hz – 25 kHz................................... ±1.0 dB
Humidity (non-condensing)
Range....................................... 0 – 95 % RH
Influence (250 Hz)........ <0.1 dB (0 – 95 % RH)
Nominal sensitivity
at 250 Hz................................... 0.25 mV/Pa
Venting
................................................. Rear-vented
Polarization voltage
..............................................................0 V
Connector
Microdot............................................. coaxial
Dynamic range
Upper limit.........................180 dB re. 20 μPa
Thermal noise...................60 dB(A) re. 20 μPa
Dimensions
Diameter.......................................... 7.0 mm
Length............................................... 53 mm
Weight..................................................... 8 g
Temperature
Operation........................... –30 °C to +100 °C
Coefficient (250 Hz):....................–0.01 dB / °C
(– 10 °C to +50 °C)
Static-pressure coefficient
250 Hz/25 °C....................... –0.005 dB / kPa
Power-supply
......................2 m A to 20 m A (typically 4 m A)
Maximum signal-output voltage (peak)
........................................................ ± 8.0 V
Accessories (order separately)
• AA0018 3 m Microdot-to-BNC high-temperature cable (max. 120 °C)
• AA0061 5 m Microdot-to-BNC high-temperature cable (max. 120 °C)
• AA0062 10 m Microdot-to-BNC high-temperature cable (max. 120 °C)
G.R.A.S. Sound & Vibration continually strives to improve the quality of our products for our customers; therefore, the
specifications and accessories are subject to change.
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