MF14万用表在轨道电路测量中存在问题的探讨

Exploration of Problems of Using MF14 Multicenter in Track Circuit Measurement

通过现场测量和理论推导证明,现场测量轨道电路设备时,不宜使用MF14指针万用表,因为该万用表内阻指标较低,测量时会造成轨道继电器端电压明显降低,实际测量结果误差远远超出仪表准确度允许误差范围。

It is proved trough field measurement and theoretical derivation that the MF14 pointer multimeter is cannot used to measure track circuit in the site.Because the low resistance of the multimeter will cause sharp decrease in the voltage of track relay terminal,the actual measurement error is far beyond the range of permissible accuracy error of the instrument.