1.

In a dual slop integrating type digital voltmeter, the firs integrating is carried out for 10 periods of the supply frequency of 50 Hz. If the reference voltage used is 2 V, the total conversion time for an input of 1 V is?(a) 0.01 s(b) 0.05 s(c) 0.1 s(d) 1 sThe question was asked in semester exam.The origin of the question is Advanced Problems on CRT and CRO in portion Oscilloscopes of Electrical Measurements

Answer»

Right answer is (c) 0.1 s

For explanation I would SAY: In a dual slope integrating digital VOLTMETER,

\((\frac{t_1}{t_2})\) Vin = Vref

Where, T1 = first integration time = 10 × \(\frac{1}{50}\) = 0.25

But Vin = 1 V and Vref = 2 V

∴ T2 = \(\frac{V_in t_1}{V_{ref}}\) = 0.1 s.


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