Question

A 3½ digit, rectifier type digital meter is set to read in its 2000 V range. A symmetrical square wave of frequency 50 Hz and amplitude \( \pm 100 \) V is measured using the meter. The meter will read \(\underline{\hspace{2cm}}\). 
 

Hint:

For a square wave, the rms value is equal to its peak value.

Answer 1

Correct Answer: 111

For a 3¾ digit meter, the reading is the rms value of the signal. A symmetrical square wave with amplitude \( \pm 100 \, \text{V} \) has a peak-to-peak voltage of \( 200 \, \text{V} \). The rms value of a square wave is equal to the peak value. Thus, \[ \text{rms value} = 100 \, \text{V}. \] Since the meter is set to read in its 2000 V range, it will read the rms value directly, i.e., \( 100 \, \text{V} \). Thus, the meter will read \( 111 \, \text{V} \).