Digital Meters, Display, Advantage

Q. A $3\frac{1}{2}$ digit digital voltmeter has an internal reference of 200 mV. It's full scale count and resolution are

1. 2000 and 1 mV
2. 4000 and 0.1 mV
3. 2000 and 0.1 mV
4. 4000 and 1 mV

Q. A $3\frac{1}{2}$ digit DVM has a lowest measuring range of 200 mV. Hence it can be concluded that

1. Its best resolution is 0.1 mV
   
2. It's poorest resolution is 0.2 mV
3. Its accuracy is at least 0.05%
4. The maximum voltage that can be measured in this range is 199.9 mV

Q. A $3\frac{1}{2}$ digit, 200 mV full scale DVM has an accuracy specification of $\pm 0.5\%$of reading plus 5 counts. When the meter reads 100 mV, the voltage being measured as

1. any value between 99.5 mV and 100.5 mV
2. any value between 99.0 mV and 101.0 mV
3. exactly 99.5 mV
4. exactly 100 mV

Q. A $3\frac{1}{2}$ digit multi meter has an accuracy specification of 0.5% of reading plus 5 counts. The value of an unknown resistance is read as $50.0\Omega$ on the $200\Omega$ scale of the meter, the value of the resistance is

1. $50.0\pm 0.25\Omega$
2. $50.0\pm 0.5\Omega$
3. $50.0\pm 0.75\Omega$
4. $50.0\pm 100\Omega$

Q. A $3\frac{1}{2}$ digit digital multimeter can display

1. 999.5
2. 5.999
3. 555.5
4. 1.999