Compact Pre-amplifier up to 4 Channels


Ability to drive long coax cables

Wide bandwidth 500 kHz to 30 MHz (20kHz optional)


Amplifiers up to 4 channels

Adjustable gain with potentiometers

Channels independent of gain adjustment

Rugged designed for extreme environments

High signal-to-noise ratio

Powered by a 9V battery or an AC adapter

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 transducers 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 acoustic emission 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 transducer excitation pulses. The output of the PREAMP2 iscapable 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 Supply Range           5VDC to 26VDC (6VDC to 13VDC recommended)

Power Consumption            PREAMP2-A: 13 mA PREAMP2-B: 26 mA PREAMP2-C: 39 mA PREAMP2-D: 52 mA

Input Voltage        0.5V p-p

Input Coupling     AC coupled

Output Voltage     ±1.1V minimum

Band Width (-3dB)               0.5 MHz to 30 MHz (20 kHz optional)

Gain Range           10 to 60dB

Temperature Range             -40ºC to 60ºC

Signal to Noise Ratio           67 dB

Humidity                20% to 90% for 9V module 20% to Condensing otherwise

Options                  BNC, LEMO 00 or SMB connectors

                                 AC power adapter

                                 9V battery module

                                 1 to 4 channels

                                20 kHz high pass filter

Part Numbers:
PREAMP2-A          One channel in-line pre-amplifier with BNC, SMA, LEMO or SMB connectors       Download PDF data sheet
PREAMP2-B          Two channel in-line pre-amplifier with BNC, SMA, LEMO or SMB connectors
PREAMP3-A          One channel in-line pre-amplifier with LEMO 00 connectors                                    Download PDF data sheet
PREAMP3-B          Two channel in-line pre-amplifier with lLEMO 00 connectors
PREAMP3-C          Three channel in-line pre-amplifier with LEMO 00 connectors
PREAMP3-D          Four channel in-line pre-amplifier with LEMO 00 connectors
PREAMP2-A9V      One channel battery-operated pre-amplifier with LEMO00 connectors                 Download PDF user's manual
PREAMP2-B9V      Two channel battery-operated pre-amplifier with LEMO00 connectors
PREAMP2-C9V      Three channel battery-operated pre-amplifier with LEMO00 connectors
PREAMP2-D9V      Four channel battery-operated pre-amplifier with LEMO00 connectors
PREAMP2-A5V      One channel pre-amplifier with free end coax cable and 5V power input              Download PDF user's manual
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