Question

A $4\frac{1}{2}$ digital multimeter has the error specification of 0.5% of its reading + 10 counts. If a D.C. voltage of 50V is Read on its 200 V full scale. Then the maximum error that can be expected in the reading is $\pm$ _________ %.

• A. 7
• B. 0.7
• C. 70
• D. 0.07

Answer 1

The correct option is B 0.7

Error due to 0.5% of reading
$=\frac{0.5}{100}\times 50=0.25V$

Error due to 10 counts
$=\frac{200}{20000}\times 10=0.1V$

$Totalerror=0.10+0.25=0.35V$

$\%error=\frac{0.35}{50}\times 100=0.7\%$