Compact Pre-Amp

Multi-Channel Pre-Amplifier


  • Drives long coax cables
  • High signal-to-noise ratio
  • Wide bandwidth: 500 kHz to 30 MHz (20kHz optional)
  • Amplifies up to 4 channels
  • Powered by a 9V battery or an AC adapter
  • Rugged designed for extreme environments
  • Adjustable gain with potentiometers
  • Channels independent of gain adjustment
  • Wide input voltage range of DC power supply
  • Input protection for high-voltage transients
  • User-specified connectors


PREAMP2 is a wide band, low noise, multi-channel pre-amplifier for ultrasonic inspections and acoustic emission tests. In ultrasonic inspections, especially for the TOFD method, tandem probes and FAST ransducers with long coax cables, the ultrasonic signals are usually weak. Thus, additional gain and signal-to-noise enhancement are necessary for optimum signal acquisition. In acousticemission test systems, it is also necessary to amplify low-signal amplitude events and the ability to drive long cables connected to remote sensors.

US Ultratek PREAMP2 pre-amplifiers are equipped in two different sets of dimensions. The dimensions of the compact module are 3" x 2" x 1". With the 9V battery option, which still provides up to 4 channels of amplifiers, the dimensions are 45/8" x 23/4" x 1". Each amplifier is independent from others, and the individual gains can be easily set by adjusting the potentiometers. All the input and output connections are protected from high voltage transients such as ransducer excitation pulses. The output of the PREAMP2 is capable of driving long coax cables over 300 feet (100 meters).

PREAMP2 uses wide DC power supplies from 5VDC to 26VDC.

PREAMP is designed to work in any set of environmental conditions, including high humidity and extreme temperatures. The unit is sealed and waterproof, allowing it to function in wet environments as well.


Dimensions Compact module: 3" x 2" x 1"
9V battery module: 4.6" x 2.75" x 1"
Power Range 5VDC to 26VDC
Power Consumption PREAMP2-A: 13 mA; PREAMP2-B: 26 mA; PREAMP2-C: 39 mA; PREAMP2-D: 52 mA.
Input Voltage 0.5 p-p
Input Coupling AC coupled
Output Voltage ±0.5V minimum
Band Width (-3dB) 0.5 MHz to 30 MHz (20 kHz optional)
Gain Range 10 dB to 60dB
Temperature Range -40ᵒC to 60ᵒC
Humidity 20% to 90% for 9V module and 20% to Condensing otherwise
Options BNC, LEMO 00 or SMB connectors
AC power adapter
9V battery module
1 to 4 channels