Technician exam question T0A12

WhyWhen measuring high voltages with a voltmeter, you should ensure the voltmeter and its leads are rated for use at the voltages being measured. A voltmeter and its test leads must be rated for the actual voltage being measured, since exceeding a meter's or lead's rating risks arcing, insulation breakdown, or a shock to the person holding it, answer B. A voltmeter should have very high, not low, input impedance so it doesn't load down the circuit (A), it shouldn't be wired to ground the circuit through itself (C), and voltmeters aren't set to a "frequency" the way a receiver is tuned (D).