MX025 Preamplifier0 pages

MX025
Microphone C-250 + preamplifier PA-25
Applications
• Acoustic precision measurement with
1/2 ‘‘ prepolarized microphones.
The MX025 is a unit comprising a preamplifier fed by a constant
current ICP® PA-25 + prepolarized microphone C-250.
Features
• Robust small preamplifier
• Excellent frequency response
The PA-25 has been specifically designed to condition the
CESVA C-250 prepolarized microphone. Because of its low output impedance the PA-25 can be used with very long, low cost,
coaxial BNC-BNC connection cables. The PA-25 has a high
input impedance which practically stops the microphone from
loading.
The CESVA PA-25 is fed by 2-20 mA of constant current.
The C-250 condenser microphone has been developed to supply the sector with greatest demand for precision sound pressure measurement. The use of materials such as nickel and
monel, and exhaustive quality control, make the C-250 a highly
reliable microphone.
D_MX025_v0012_20111212_ENG
The Mx025 unit has an excellent frequency response and low
noise.
Characteristics
• Nominal microphone diameter: 1/2’’
• Sensitivity (1kHz): 50 mV/Pa –8/+5 mV/Pa
• Dynamic range (3% distortion limit)*: > 136 dB
• Noise level referred to input*:
Frequency weighting A: < 15 dB
• Frequency response: Type 1 (UNE-EN 60651:1996)
• Excitation:
Constant current excitation: 2 to 20 mA
Excitation voltage: 27 to 30 V
• Output bias voltage: 15 to 17 V
• Output impedance: < 50
• Operating temperature: -10 to 50ºC
• Operating relative humidity: 0 to 95%
• Variation of the sensitivity with the temperature (-10 to 50ºC):<
0,2 dB
• Output connector: BNC female
*referred to 20 µPa
Accessories
• Box
The characteristics, technical specifications and
accessories may vary without prior notice
Maracaibo, 6 - 08030 Barcelona (Spain) - Tel. (34) 934.335.240 - Fax. (34) 933.479.310 - e-mail: info@cesva.com - www.cesva.com