In the table below, when did Voltage Meter 4 first have an abnormal reading?

Question

3/2/2012

2:00 am 3/2/2012

2:01 am 3/2/2012

2:02 am 3/2/2012

2:03 am 3/2/2012

2:04 am 3/2/2012

2:05 am
Voltage Meter 1 800.526 800.526 800.526 800.526 800.526 800.526
Voltage Meter 2 800.788 800.788 800.788 800.788 800.788 800.788
Voltage Meter 3 800.238 700.755 800.238 800.238 800.238 800.238
Voltage Meter 4 800.325 800.325 0 0 0 0
Voltage Meter 5 800.526 800.526 800.526 800.526 800.526 800.526
Responses

2:04 am
2:04 am

2:03 am
2:03 am

2:01 am
2:01 am

2:02 am

Answer 1

Voltage Meter 4 first had an abnormal reading at 2:02 am on 3/2/2012, where the reading dropped to 0.