The FTA Reversing DC Potential Drop System has been designed by Keith Donald to provide the precise current and amplifier stability necessary for the reversing DC potential drop method of monitoring crack size. Custom-manufactured at FTA’s facility, the system is intended to be used in conjunction with the FTA Adwin-Gold Fatigue Crack Growth Rate data acquisition and control testing software, which synchronizes current reversing and voltage measurement.The system consists of two units:The FTA programmable linear DC power supply has a current rating of 20 amps and a voltage rating of 5 volts. Solid-state polarity-reversing relays have been internally installed and are controlled by two digital logic signals from the Adwin-Gold. Polarity reversing has two distinct advantages over pulsed (on...Read more
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