GB/T 27992.3-2016 Instruments for water-depth measurement—Part 3:Echo sounder

GB/T 7965-2002 Acoustics—Measurement of underwater sound transducers GB/T 8016-2009 Marine echo-sounding equipment GB 4208-1993 Degrees of protection provided by enclosure (IP code) GB/T 4208-2008 Degrees of protection provided by enclosure(IP code) GB/T 4208-2017 Degrees of protection provided by enclosure(IP code) GB/T 9359-2001 Basic conditions and methods of enviromental test for hydrologic instruments GB/T 9359-2016 Basic conditions and methods of environmental test for hydrological instrument GB/T 9969-2008 General principles for preparation of instructions for use of industrial products GB 9969.1-1998 General principles for preparation of instructions for use of industrial products GB/T 18185-2000 Specification of reliability for hydrologic instruments GB/T 18185-2014 Specification of reliability for hydrologic instruments GB 18523-2001 General specification for hydrologic instrument safety requirements GB/T 19677-2005 Essential technical terms and symbols for hydrologic instrument GB/T 19705-2005 General specification of signals and interfaces for hydrologic instruments GB/T 19705-2017 Signals and interfaces of hydrometry instruments