Question

A $4\frac{1}{2}$ digital voltmeter is used for voltage measurement choose the correct statement(s) regarding $4\frac{1}{2}$ DVM.

• A. The resolution of given DVM is 0.0001
• B. Meter cannot distinguish between values that differ from each other by less than 0.001 of full scale.
• C. 12.98 would be displayed on 10 V ranges, like 12.980 V
• D. 0.81776 would be displayed on 1 V ranges, like 0.8177 volts

Answer 1

Answer: (A), (C), (D)

0.81776 would be displayed on 1 V ranges, like 0.8177 volts

(a,c,d)
$Resolution=\frac{1}{{10}^n}$,
n = number of full digit

$Resolution=\frac{1}{{10}^4}=0.0001$

$\Rightarrow$ Hence, meter cannot distinguish between values that are differ from each other by less than 0.0001.

$\Rightarrow$ Resolution on 1 V range is = 1 x 0.0001 = 0.0001

Resolution on 10 V range is = 10 x 0.0001 = 0.001

Hence on 10 V range, 12.98 V displayed like 12.980 V.

$\Rightarrow$ 0.81776 will be displaced on 1 V ranges, like 0.8177 V.