1.1本规程为用户提供了手动校准测深仪或电子测深仪的程序。本叙述描述了校准术语，描述了可接受的校准环境条件，并描述了校准程序。 1.2引用的参考文献包含校准设备的构造和正确操作的有用信息。 1.3本说明中引用的任何特定产品或品牌名称仅供参考，旨在描述但不限制性能良好的产品。 1.4以英寸表示的数值- 磅单位应视为标准单位。括号中给出的值是到国际单位制的数学转换，仅供参考，不被视为标准值。 1.5 本标准并非旨在解决与其使用相关的所有安全问题（如有）。本标准的用户有责任在使用前制定适当的安全和健康实践，并确定监管限制的适用性。 ====意义和用途====== 由于水中声速或声速随温度、盐度和水深的变化而变化，测深仪或回声测深仪进行的深度测量的准确性需要进行多次校正。 此外，设备的不稳定性也可能导致重大误差。有关更多信息，请参阅规程D 5073 . 回声测深仪的校准对于确保深度测量的充分性至关重要。准确校准回声测深仪后，任何观察（记录）的深度都可能与真实水深有关。因为回声探测的目的是测量 “ 真的 ” 深度，独立 “ 真的 ” 必须使用参考。 条形检查是确定仪器和速度误差校正的最广泛、最容易构造和最经济的机械方法。 本程序说明了使用条形检查校准测深仪或电子测深仪。 棒材检查技术和设备在本质上是通用的，可能需要修改以在特定的现场条件下使用。

1.1 This practice provides the user with procedures used in manually calibrating the fathometer or electronic depth sounder. This narrative describes calibration terminology, describes acceptable environmental conditions for calibration, and describes the calibration procedures. 1.2 The references cited contain useful information in the construction and the correct operation of the calibration equipment. 1.3 Any references cited in this narrative to specific products or brand names are made for information only, and is intended to be descriptive, but not restrictive, of products that will perform satisfactorily. 1.4 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard. 1.5 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. ====== Significance And Use ====== The accuracy of depth measurements made by a fathometer or echo sounder requires a number of corrections because of the variability of sound or acoustic velocity in water with changes in temperature, salinity, and depth of water. In addition instability of the equipment can also result in significant errors. For additional information see Practice D 5073 . Calibration of echo sounding instruments is absolutely critical in assuring the adequacy of depth measurements. When an echo sounder has been accurately calibrated, any observed (recorded) depth can be related to the true depth of water. Since the intended purpose of echo sounding is to measure the “ true ” depth, an independent “ true ” reference must be used. A bar-check is the most wide-spread, easiest to construct, and most economical mechanical method to determine corrections for instrument and velocity errors. This procedure explains the calibration of a fathometer or electronic depth sounder using a bar-check. Bar-checking techniques and equipment are general in nature and may need to be modified for use in specific field conditions.