Microphone Preamplifiers

1706 High Temperature CCLD Microphone Preamplifier

1706 High Temperature CCLD Microphone Preamplifier

High-temperature CCLD Microphone Preamplifier Type 1706 enables you to make acoustical measurements at temperatures up to 125°C (257°F) with a constant-current line drive (CCLD) input module. You can connect ½″ 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 1706 over a wide range of environmental conditions.


  • Multichannel signal analysis measurements
  • Multichannel sound power measurements
  • Industrial machinery noise measurements


  • Optimised noise specifications
  • ICP® compatible
  • BNC connector for easy installation and use with inexpensive BNC cables
  • Connects directly to CCLD sockets and to LEMO sockets with adaptor
  • Low output impedance allows long extension cables to be used
  • Supports “Smart Transducer Interface” IEEE 1451.4 containing TEDS (Transducer Electronic Data Sheet)

Diameter: 1/2
Optimised for: CCLD
Connector at preamplifier: BNC
Connector at instrument/cable: n/a
Calibration facility: None
Polarization voltage support: No
Supply voltage: 28
Max output voltage (peak): 7
Max output current (peak): 19
Frequency range: -0.35
Noise A-weighted, typical: 4
Noise 22,4 Hz to 300 kHz, typical: 15
Input impedance: 1.5||0.4
TEDS UTID: 1025 from serial number 2264319