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Applications:
DeltaTron Microphone Preamplifier Type 2671 enables you to make acoustical measurements with a DeltaTron input module. You can connect 1/2" prepolarized microphones to the preamplifier. The preamplifier’s low output impedance allows problem-free use of long extension cables. The robust, compact design means that you can use Type 2671 over a wide range of environmental conditions.
Preamplifier Type 2671 is very compact and operates over a wide range of temperature, humidity and other environmental conditions. It has a very high input impedance, presenting virtually no load to the microphone. The low output impedance means that you can connect long cables between the preamplifier and measurement equipment.
The main application for the preamplifier is in vibration setups with DeltaTron or ICP input modules where it is also desired to make acoustical measurements. It presents a very price-competitive solution compared to a system with both vibration and acoustical inputs.
DeltaTron is a generic name for accelerometers and signal conditioning products from Brüel&Kjær. It identifies products that operate on a constant-current power supply and give output signals in the form of voltage modulation on the power supply line. One of the advantages of this system is that it allows you to use inexpensive BNC coaxial cables.
The preamplifier converts the DeltaTron or ICP constant- current line drive (CCLD) supply, which must be between 2 and 20 mA (nominal 4mA), into a constant 12 V DC level. The output signal from the microphone swings around this DC level. Since no polarization voltage is available, only prepolarized condenser microphones can be used. The input impedance of Type 2671 is lowered to 1.5GΩ with the purpose of making a high-pass filter at 20 Hz. This is done in order to compensate for filters which are often missing in the input modules (for example, Aweighting).
Type 2671 is also available in a version without the high-pass filter, which has a flat response down to 2 Hz, and in a version with built-in A-weighting, Type 2699.
TEDS
Support of TEDS means that the preamplifier can be used with the newly developed Smart Transducer interface according to IEEE P 1451.4. The ability to store and recall TEDS data drastically reduces test setup time and allows cost savings in most measurement situations.
Model No
2671
Condition
Used
Manufacturer
Bruel & Kjaer
30+ Years in Business
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30+ Years in Business
Secure Payments
Sell Test Equipments
Knowledgeable Staff
On-site Lab
