A 3 1/2 digit voltmeter has an accuracy specification of +/- 0.4% of reading and +/- 1 digit. Determine: (i) the resolutions of the instrument. (ii) how a voltage of 0.6842 V will be displayed on the 15 V scale.

Voltmeter ya $3\frac{1}{2}$ digit inaweza kuonyesha hadi namba 1999. Resolution ni mabadiliko madogo zaidi ambayo chombo kinaweza kuonyesha, ambayo ni 1 count ya digit ya mwisho. Resolutions hutegemea kiwango (range) kilichochaguliwa:

• Kwenye kiwango cha $2 \ V$ (mfano, $0.000 \ V$ hadi $1.999 \ V$), resolution ni $0.001 \ V$.
• Kwenye kiwango cha $20 \ V$ (mfano, $0.00 \ V$ hadi $19.99 \ V$), resolution ni $0.01 \ V$.
• Kwenye kiwango cha $200 \ V$ (mfano, $0.0 \ V$ hadi $199.9 \ V$), resolution ni $0.1 \ V$.

(i) Resolutions za chombo:

$$\boxed{\text{0.001 V (kwa 2V range), 0.01 V (kwa 20V range), 0.1 V (kwa 200V range)}}$$

Kiwango cha $15 \ V$ kinamaanisha kuwa voltmeter imewekwa kwenye range inayoweza kupima hadi $15 \ V$. Kwa voltmeter ya $3\frac{1}{2}$ digit, range inayofaa zaidi ni $20 \ V$ (ambayo huonyesha hadi $19.99 \ V$).
Kwenye range hii ya $20 \ V$, resolution ni $0.01 \ V$. Hii inamaanisha kuwa usomaji utazungushwa hadi sehemu mbili za desimali.
Voltage ya kuonyeshwa ni $0.6842 \ V$.
Kuzungusha $0.6842 \ V$ hadi sehemu mbili za desimali kunatoa $0.68 \ V$.

(ii) Jinsi voltage ya $0.6842 \ V$ itaonyeshwa:

$$\boxed{\text{0.68 V}}$$