Outline The ultrasonic hardness checker (SONOHARD) works quite differently to conventional hardness testers. In conventional hardness tests, a microscope is used to measure the diameter of the depth of an indentation made on a test sample. The SONOHARD works by pushing a vibration rod with an attached diamond indenter onto a test specimen with a constant force. A longitudinal ultrasonic vibration is then applied to the rod to measure hardness. Features Measurement only takes a few seconds Leaves only tiny indentations on test specimens (approx. 0.1mm2) Hardness values can be read directly (HV, HRC, Hs, HB) Conversion to breaking strength (N/mm2) Measuring stands (wooden, iron, resin, etc.) do not influence measurement Measurements do not affect the backs of test samples Can be certified by Nippon Kaiji Kyokai (NK) 4000 points of data memory 10 points of calibration memory Advantages Portability makes it ideal for use in the field Measurements can be made freely in any direction No need to change parts regularly, resulting in lower running costs Enables hardness checking for hardening and annealing control Large and complex-shaped objects can be measured as they are Enables hardness checking for metal fatigue inspections to identify equipment structural problems Easy data management using a PC with data transfer software (option) Data can be output to external printers (option) Measurement data can be output to an alarm (non-voltage contact) according to upper limit and lower limit settings. Specifications Name/model Ultrasonic Hardness Checker SONOHARD SH-75A Indenter Diamond indenter for Micro-Vickers (a pyramid with an angle of 136° between opposite planes) Test load 19.61N (2kgf) Measuring range Vickers hardness: HV50 to HV999 Rockwell hardness: HRC10.0 to HRC70.0 Shore hardness: HS20.0 to HS99.9 Brinell hardness: HB85 to HB550 Applicable test materials Steel (other materials can be tested using a standard calibration block) Data memory 4000 points Power source AM-965N for 100V AC adapter or Ni-Cd battery (SH-75A body built-in, BL ON: 5 h, BL OFF: 8 h) Dimensions SH-75A body: 190 x 110 x 109mm Electric probe: ø 50 x 164.5mm Carrying case: 358 x 267 x 150mm Weight SH-75A body: approx. 1.2kg Electric probe: approx. 250g (excl. electric probe cable)