仪器常数是一个系数，将它与仪器的直接示值（即读数）相乘，即可得到仪器的示值。当直接示值等于被测量值时，仪器常数为1。
讨论了半空间中均质地层电导率对仪器常数刻度值的影响。
The influence of conductivity of homogeneous formation on the calibrating value of the tool factor in half space is discussed.
陀螺全站仪定向中，仪器常数的稳定性直接影响到定向结果的可靠性。
The stability of apparatus constant will directly influence on the stability of the result in the orientation of gyrotheodolite.
对各种误差的影响性质和大小做了全面的分析，细致地讨论了仪器常数的内容。
Discussion is also made on the property and magnitude of various errors as well as the implication of instrumental constants.
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