... testing of surface crack, weld, hole, inclusion, etc. The frequency ranges from 50Hz to 5MHz, to meet the requirements of ... channel: 1-8, can be extended to 128 channels2. Frequency range: 50 Hz~10 MHz,to meet various metal material ... time base display11. Digital Filtering: High-pass frequency (0Hz ~ 2000Hz), low-pass frequency (0Hz ~ 2000Hz)12. Dalayed hardware output alarm, real-time hardware ...