If using a separate current source and voltmeter to make low resistance measurements, each instrument must be checked for non-ohmic contacts.
如果使用分离的电流源和电压表来进行低电阻测量，则必须检查每台仪器的非欧姆接触情况。
Because of the low test current level used, a very sensitive voltmeter is required to measure the voltage drop, which is usually in the microvolt range.
由于所使用的测试电流很低，所以就需要非常灵敏的电压表来测量这种通常在微伏范围的电压降。
Ideally, when a voltmeter is connected to a relatively low impedance circuit in which no voltages are present, it should read zero.
在理想的情况下，当把电压表连接到一个没有电压的、阻抗比较低的电路时，电压表的读数应当为零。
Test and mark the resistance value of the old elements having been replaced (with voltmeter and ammeter) and distribute them in low temperature area.
换下来的元件重新（用压表、电流表）测标其电阻值，配阻用在低温区。
Test and mark the resistance value of the old elements having been replaced (with voltmeter and ammeter) and distribute them in low temperature area.
换下来的元件重新（用压表、电流表）测标其电阻值，配阻用在低温区。
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