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This is an A/D converter-integrated switching box offering high-speed, high-accuracy measurement and developed to allow expansion of measurement points combined with a data logger. It can measure 50 points in a high-speed 0.4 seconds. Several switching boxes in system and with parallel use of the integrated A/D converters allows strain measurement of 1,000 points in the same 0.4 seconds. High-speed digital communication by RS-422 insulated from the measuring unit or optical fiber makes it extremely resistant to noise. IHW-50G-01 (factory-installed option) allows measurement in high-speed mode (HSP) when connected to only a single TDS-630 high-speed, high-functionality data logger.