See our other ad for the 4188 Microphone

A very compact preamplifier designed for acoustical measurements with a CCLD input module in a wide range of environmental conditions and in narrow spaces. Prepolarized microphones can be connected to the preamplifier.

The Type 2695 preamplifier 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 preamplifier’s main application is in vibration analysis configurations 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 Brüel&Kjær transducers and signal conditioning products.  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 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. As no polarization voltage is available, only prepolarized condenser microphones can be used, e.g., Types 4155, 4176, 4188, 4189, 4942 and 4944 (not included).

USE SCENARIOS:

• Coupler measurement
• Measurements where space is limited

FEATURES & SPECIFICATIONS:

• 10 – 32 UNF output connector
• Connects directly to CCLD sockets
• Low output impedance allowing the use of long extension cables
• ICP® compatible
• Supports "Smart Transducer Interface" IEEE P 1451.4 containing TEDS (Transducer Electronic Data Sheet) 

• Diameter:     1/2
• Optimised for: Short CCLD
• Connector at preamplifier: 10 – 32 UNF
• Supply voltage: 28
• Max output voltage (peak): 7
• Max output current (peak): 19
• Frequency range: 20 to 50000
• Attenuation: < 0.2
• Noise A-weighted, typical: 4
• Noise 22,4 Hz to 300 kHz, typical: 12
• Input impedance: 1.7||0.4
• TEDS UTID: 1025

Additional specifications available upon request, or from bksv.com

This sale is for the BRAND NEW / NOS 2695 Preamplifier Only.