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This "HARD ECHO" is developed to measure the case-hardened layer by the ultrasonic scattering echo. The suitable selection of probe,holder and measuring conditions enables to distinguish the boundary of the case-hardened layer and the base metal. Features 1.High Sensitivity - enabling to measure the near surface of products. 2.Accurate Data Reading - with high frequency high resolution & focused probe. 3.Stable Transmission - of ultrasonic beams by immersion method. 4.Easy Operation - by closed water column method. 5.High Stability and Accuracy - with the optimum shaped probe fitting to products. 6.Manual Scanning - with a uniaxial scanner available(optional) Measurement Principle The case-hardened layer has a fine metallographic texture than the non-hardened layer belowi t. An ultrasonic pulse irradiated upon a workpiece whose case depth is to be measured is backscattered from the boundary between such two layers as an echo .By measuring the time from the injection of pulse to the return of the echo,the case-hardened depth is calculated and displayed on a CRT screen. Applications The "HARD ECHO"can be applied foe the various case-hardened components by high frequency induction heating such as automotive parts,construction machinery,machining tools,internal combustion engine and various industrial machinery. Standard Components HARD ECHO(SH-65)...1 Probe...1 Probe holder...1 (designed and manufactured for each work by SISCO) Probe cable and accessories...1 set Battery...1 AC power adaptor...1 Compact Flash memory...1 Specifications 1.HARD ECHO ItemPerformancMeasurement objectDepth of the layer hardened by induction hardeningMeasurement range0.7 15mmMeasurement resolution0.1mmMeasurement repeatability±0.1mm(At the same measuring point)Scanner interfaceIncluded(Scanner is optional.)Communication functionIncluded,protocol RS-232 (The communication kit is necessary for communicating personal computer) 2.ULTRASONIC TEST INSTRUMENT Sensibility80-dB 5MHz Narrow BandAdjustable gain110 dB with 0.1 dB pitchCenter frequency and bandwidth1,2,5 and 10 MHz,Broadband(0.4 14.3 MHz)Test range1 14,500 mm longitudinal mode in steelDisplay time-base linearityless than ±1%Power supply(AC)Voltage;100 240 V AC ±10% Frequency;50 60HzPower supply(Battery)lithium ion batteryBattery operating timeapprox.5 hr for one battery,approx.10 hr for two batteriesAmbient temperature0°C 45°C(during operation),-20°C 65°C(during storage period)Display and screen size6.4''TFTcolor LCDExternal dimension (mm)175(H)×270(W)×103(D)Massapprox.3.5kg(including a battery)