1.1本试验方法概述了为岩土工程目的校准线性位移传感器（LDT）及其读出系统的程序。它涵盖了用于测量位移的任何传感器，该传感器提供与位移成线性比例的电输出。这包括线性可变位移传感器（LVDT）、线性位移传感器（LDT）和线性应变传感器（LST）。 1.2本校准程序用于确定传感器及其读出系统的输出与长度变化之间的关系。该关系用于将传感器读出系统的读数转换为工程单位。 1.3本校准程序还用于确定传感器及其读出系统在其使用范围内的精度，以与制造商的仪器规范进行比较，并确定仪器在特定应用中的适用性。 1.4本标准无意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====== LDT在岩土工程应用中起着重要作用，可以测量试样尺寸的变化。 LDT必须经过校准，以便在实验室中使用，以确保将传感器的电输出可靠地转换为工程单位。 在使用传感器的电子配置发生任何变化后，在使用传感器的测试条件发生任何与上次校准期间不同的重大变化后，以及在传感器上可能影响其响应的任何物理作用后，应在首次使用前至少每年校准一次LDT。 LDT通常具有一个工作范围，在此范围内，电压输出与传感器的位移成线性比例。该程序适用于传感器的线性范围。推荐做法是仅在其线性工作范围内使用LDT。

1.1 This test method outlines the procedure for calibrating linear displacement transducers (LDTs) and their readout systems for geotechnical purposes. It covers any transducer used to measure displacement which gives an electrical output that is linearly proportional to displacement. This includes linear variable displacement transducers (LVDT's), linear displacement transducers (LDTs) and linear strain transducers (LST's). 1.2 This calibration procedure is used to determine the relationship between output of the transducer and its readout system and change in length. This relationship is used to convert readings from the transducer readout system into engineering units. 1.3 This calibration procedure also is used to determine the accuracy of the transducer and its readout system over the range of its use to compare with the manufacturer's specifications for the instrument and the suitability of the instrument for a specific application. 1.4 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 LDTs play an important role in geotechnical applications to measure change in dimensions of specimens. The LDTs must be calibrated for use in the laboratory to ensure reliable conversions of the sensor’electrical output to engineering units. The LDTs should be calibrated before initial use, at least annually thereafter, after any change in the electronic configuration that employs the sensor, after any significant change in test conditions using the transducer that differ from conditions during the last calibration, and after any physical action on the transducer that might affect its response. LDTs generally have a working range within which voltage output is linearly proportional to displacement of the transducer. This procedure is applicable to the linear range of the transducer. Recommended practice is to use the LDT only within its linear working range.