rdg、dgt、fs在仪器精度的表示的含义

数字测量仪器的技术参数里的误差用测量精度表示；模拟测量仪器的测量精度用测量公差表示。精度和公差一般是以全刻度值（f.s)和显示读数字(rdg.)或是以数位分辨率(dgt)来定义的。具体解释如下：

fs.(最大显示或标尺的长度，满量程）
表示最大的显示（刻度）值或刻度长度（当刻度包含不等增量单位或最大值无法定义时）。一般是现行使用的量程值（写在量程旋钮上的数值，或相当的数值）。但是，要特别注意，有时最大值显示是2000V,但量程只有600V.最大显示值（标尺值）仍然用f.s.值表示。

rdg.(显示或指示值，......读数值）
表示实际测量的数据，也就是测试仪器现在的指示值或显示值。

dgt.(数位分辨率......位数）：
表示数字测量仪器的最小显示单位，也就是数字显示屏幕最小位次为“1”的数值。（这就是模拟--数字转换的十进制转换），其实这是dgt误差和fs转换误差的误差。
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The specifications in this catalog include figures for "measurement accuracy" when referring to digital measuring instruments, and for "measurement tolerance" when referring to analog instruments.
The accuracy and tolerance figures in the product specifications are defined in terms of full scale(f.s.) value and displayed reading (rdg.) or digit resolution (dgt.) as described below.
f.s. (maximum display, or length of scale, ...full-scale)
Signifies the maximum display (scale) value or the length of the scale (in cases where the scale consists of unequal increments or where the maximum value cannot be defined). In general, this is the range value (the value written on the range selector, or equivalent) currently in use. However, be aware that in cases where the maximum display value is 2000V but the range value is only 600V, the maximum display value (scale value) is still used as the f.s.value.
dgt. (digital resolution, ... digit)
Signifies the smallest display unit on a digital measuring instrument, i.e., the value displayed when the last digit on the digital display is "1". Essentially, this indicates an error of 1 digit (based on decimal processing in analog-to-digital conversion), but in actuality this is the digit error combined with the f.s. error converted to a fraction of a digit unit. The accuracy associated with a particular measured value as shown in the product specifications is derived from these values.
rdg. (displayed or indicated value, ... reading value)
This signifies the value actually being measured, i.e.,the value that is currently indicated or displayed by the measuring instrument.
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