Discussion
Which of the following would need a 4½ digit digital multimeter ?
Answer: D
The reading that needs a 4½ digit meter is 1.4856 mV.
A 4½ digit display has four full digits (0-9) and a leading half digit that can only be 0 or 1, so its maximum count is 19999. The reading 1.4856 has five digits with a leading 1, which fits exactly.
1.999 mA and -1.999 µV have four digits with a leading 1, which a 3½ digit meter (maximum count 1999) can already show, and so can 1000 V. Only 1.4856 mV requires the extra digit.
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