If the meter is switched to 20 V DC, for example, then 20 V is the maximum voltage which can be measured, This is sometimes called 20 V fsd, where fsd is short for full scale deflection.

• 例如，如果仪表切换到DC20V档，那个20V就是此档可以测量的最大测量电压，这可以称为20VFSD，FSD为满量程值的缩写。