In the book first this form of half-wave rectifier voltmeter is introduced 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 postive 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 .