In the book this form of half-wave rectifier voltmeter is introduced first and then the author says that there is a problem in this circuit: that when the AC source is in the reverse direction there is a chance that the diode may break-down causing damage to meter. I understand this part. Then he gives a modified version of this voltmeter:
Now he says that during reverse operation this D2 will be forward biased and there will be no problem.
But now there is a problem when the AC is positive, I mean this diode D2 can break-down in the positive operation. Nothing has been mentioned about this. I simply wanted to confirm: am I right in thinking so? And If I am not, what may be the reasons?