A 0–200 V voltmeter has a guaranteed accuracy of ±1% of full-scale reading. If the instrument indicates 50 V, the actual voltage being measured lies between:
48.0 V and 52.0 V
When accuracy is specified as a percentage of full-scale reading, the limiting error in volts is the same at every point on the scale.
Limiting error = \(\pm 1\% \times 200\ \text{V} = \pm 2\ \text{V}\).
For an indicated value of 50 V, the true voltage lies within \(50 \pm 2\ \text{V}\).
Lower limit = 50 − 2 = 48 V and upper limit = 50 + 2 = 52 V. (At this reading the relative error is \(\frac{2}{50} \times 100 = 4\%\).)
Hence, the answer is 48.0 V and 52.0 V.
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Important Questions from Indicating Instruments
Hot wire ammeters are used for measuring
Which one of the following force is not needed for the satisfactory operation of any indicating (or measuring) instrument?
Assertion (A): Shunt of an ammeter has a low resistance
Reason (R): Shunt may be connected in series or in parallel with an ammeter.Which of the following statements are correct?
A. Ultrasonic method for liquid level measurement is not preferred in industrial applications.
B. In a pH meter, the glass electrode is the reference electrode.
C. A chromatograph is used for analyzing the composition of a gas.
D. The production of Korotkoff sounds in indirect blood pressure measurement is due to pressure pulses produced due to the difference in systolic and diastolic blood pressure.
Choose the correct answer from the options given below:
- Which instrument is representing an integrating type instrument?
