7. MEASURING PROCEDURES
7-l MEASURING INSTRUMENTS
(1) VOLTMETER
AC voltmeter is necessary.
The approximate AC voltage ranges of
the voltmeters to be used for various
types of generators are as follows :
0 to 150 V : Type with an output voltage
ofllOor120V
0 to 300 V : Type with an output voltage
of 220,230 or 240 V
0 to 150 V, 0 to 330 V : Dual voltage type
(2) AMMETER
AC ammeter is necessary.
An AC ammeter with a range that can be
changed according to the current rating
of a given generator is most desirable.
(About 10 A, 20 A, 100 A)
FOR AC
(3) FREQUENCY METER
Frequency range : About 45 to 65Hz
NOTE : Be careful of the frequency meter’s input
voltage range.
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