Vallen Systeme offers a number of extremely robust preamplifiers perfectly suited for use with the AMSY-6 system. Bandwidth and performance can be selected to match the test requirements. Their consequent design with matching 50 Ohm impedance and their low noise input stage make them unique on the market. Only selected components and materials are used to ensure reliable operation even under difficult operating conditions.
AEP5 and AEP5H
The AEP5 as well as AEP5H is a general purpose preamplifier supporting single-ended sensors. This preamplifier is a wide-band preamplifier available in two different bandwidth settings (AEP5 and AEP5H):
- Gain can be set to 34 dB or 40 dB
- AEP5: 2.5 kHz to 2.4 MHz (10 Vpp)
- AEP5H: 20 kHz to 2.4 MHz (10 Vpp)
- AEP5 and AEP5H can put a voltage pulse (up to 450 Vpp) through to the AE sensor (sensor coupling test)
Magnetic holders are mounted directly to the housing, alternatively a holding plate with four magnets can be used for more stability.
The AEP4H-ISTB is a preamplifier specifically designed for high sensitivity requirements like tank bottom tests. It is a low-noise preamplifier with higher gain (46 dB) and strong magnetic holders. The AEP4H-ISTB can accommodate a VS30-V or VS75-V sensor (sensor must be ordered separately). The integrated sensor-to-preamplifier cable is well protected against EMI (electromagnetic interference). Because of the very short cable between sensor and preamplifier, AE signal amplitudes are higher compared to standard combination of AE sensor connected to AEP5(H) preamplifier with 1.2 m long sensor cable. The strong magnets allow easy installation and guarantee constant contact pressure throughout the test.
Amplification of an AEP3N can be selected in the range from 34 to 49 dB via software when used with an AMSY-5 or AMSY-6. In standalone usage gain is set by jumpers. Exchangeable frequency filter modules allow the use without steep downstream frequency filters. AEP3N provides two inputs, one with the common single-ended BNC connector and the other with a differential BNO connector.