In voltage measurements, the voltage source resistance is in parallel with the voltmeter input resistance (see Figure 2-1). The input resistance is normally much larger than the source resistance; hence, the source resistance value usually determines the Johnson noise voltage.
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Thermoelectric voltages are the most common source of errors in low voltage measurements.
热电电压是低电压测量中最常见的误差来源。
In view of local measurements on implication and control of UPFC, the control mode of reactive currents control and voltage injection should be used.
提出在基于本地测量参数的UPFC的应用级控制中采用“无功电流控制”和“电压注入控制”的模式。
In fact, voltage measurements are used much more often than current measurements.
事实上，电压的测量比电流的测量用的更多。
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