range extension meaning in English

范围的伸展
范围扩大

A low - voltage voltmeter associated with detachable high - voltage probe for range extension may be calibrated together as a single high - voltage voltmeter
一个低压电压表及其可卸下的扩程高压探针将被视作为一个单一的高压电压表并可一并接受校正。
Dc voltmeters with measuring ranges from 1 kv to 30 kv will be calibrated by comparing their readings with the known values of applied high voltages . low - voltage voltmeters , and detachable high - voltage probes for range extension may be calibrated together as a single high - voltage voltmeter
对于量程由1kv至30kv的直流电压表，本所将使用已知数量的高压标准，测试比较该电压表的显示读数，予以校正。
In this paper , i study above two issues and gain some results as follows : 1 . under population follow normal distribution hypothesis , designing combine median - range adaptive control charts with variable sampling interval , variable sample size and variable control limit . it may be regarded as previously median - range extension
在假设总体服从正态分布的条件下，设计了抽样区间，样本容量和控制限都变化的全变化参数的中位值-极差联合控制图。它是以前的中位值-极差联合动态控制图的推广。