Read Technical Specification 2-Channel EMAT System text version

Technical Specification 8-Channel EMAT System The 8-Channel EMAT equipment consists of two main components described below. 1. Base Unit, including:

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2.

Synthesizer board Burst generator board (frequency range: 0.4 - 4MHz); burst length (number of cycles) and frequency are adjustable via PC Four receiver boards with eight delayed receiver channels (delay time of all channels can be modified separately), including preamplifier and filters Output amplifier and video unit (LCD color monitor) AT-compatible PC for system parameter control Power supplies Front End, including: Eight transmitter power stages for EMAT transducers or transmitter and receiver boards for piezoelectric transducers Transducer(s) and transducer cable(s) Power supplies

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General System Data

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Frequency range ....................................................0.4 to 4.0MHz, adjustable in 10kHz increments Burst duration.......................................................... 1 - 15 cycles, adjustable in 1 cycle increments Pulse repetition rate .................................... 2500µsec to 20msec, adjustable in 1µsec increments Delay time ................................................................ 0 to 25µsec, adjustable in 25nsec increments Total amplification .......................................................... 50dB, 40dB adjustable in 1dB increments

Controllable System Functions:

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Trigger mode selection................................................................internal, external, software trigger Transducer selection...................................................................2x 4-segments, or 1x 8-segments Pulse repetition rate and ultrasonic frequency Number of cycles/burst Delay time for each transmitter and receiver channel Filter selection.......................................................... 0.4 - 1.3MHz, 0.8 - 2.3MHz and 2.0 - 4.0MHz Frequency settings....................................................................................................... 0.4 to 4MHz Burst duration................................................................... 1 - 15 cycles, adjustable in 1 cycle steps Receiver attenuator .............................................................. 30dB, adjustable in 10dB increments Receiver amplifier ................................................................... 40dB, adjustable in 1dB increments

8-Channel EMAT Page 1 of 2

This document contains information proprietary to QUALITY NETWORK INC.; it is submitted in confidence and is to be used solely for the purpose for which it is furnished and returned upon request. This document and such information is not to be reproduced, transmitted, disclosed, or used otherwise in whole or in part without the written authorization of QUALITY NETWORK, INC.

Transmitter Data

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Transmitter output impedance.............................................................................................. 8 to 9 Transmitter current ...................................................................................30 APP (impedance 22) Transmitter output voltage (open circuit).............................................................................. 1kVPP Transmitter output short circuit protected for burst signals

Receiver Data

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Pre-amplification ..................................................................................................................... 30dB Amplification................................................................... 50dB; 40dB adjustable in 1dB increments Noise level of summation signal at output.................... 100 mV (for band-pass filter 0.4 - 1.3 MHz) 3 selectable band-pass filters (-3dB)........................ 0.4 - 1.3MHz, 0.8 - 2.3MHz and 2.0 - 4.0MHz Bandwidth (-3dB) ......................................................................................................... 0.4 to 4MHz Input, output impedance............................................................................................................ 50 Preamplifier input sensitivity.................................................................................................... 50µV Main amplifier input sensitivity........................................................................................ 1.5 to 2mV Maximum RF-signal amplitude output.................................................................................... 10VPP

Signal Modes and Delay Times

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Transmitter mode ................................................................................................................... digital Receiver mode ...................................................................................................................... analog Maximum delay time .....................................................................50µsec fixed, 25µsec adjustable Minimum delay time ............................................................................................................. 50µsec

Trigger Data

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Trigger IN: TTL, input impedance.............................................................................................. 1k Trigger OUT: TTL, output impedance ....................................................................................... 50

8-Channel EMAT Page 2 of 2

This document contains information proprietary to QUALITY NETWORK INC.; it is submitted in confidence and is to be used solely for the purpose for which it is furnished and returned upon request. This document and such information is not to be reproduced, transmitted, disclosed, or used otherwise in whole or in part without the written authorization of QUALITY NETWORK, INC.

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Technical Specification 2-Channel EMAT System

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