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。
Since the voltage drop across the ammeter is negligible, essentially all the test voltage appears across R.
由于安培计上的电压降可以忽略，所以所有的测试电压都出现在电阻R上。
The Source-Measure Unit can also test other diode parameters, including forward voltage drop and breakdown voltage.
源-测量单元还可以测量其它的二极管参数，包括正向电压降和击穿电压。
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