英文解释： 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. 文章出处：http://www.8617.cn/viewnews.php?infoid=377
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