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8-1-2
INSTRUMENTS
I
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
15OV:
Type with
an
output voltage
of
110
0
to
300V:
Type with an output voltage
of
220,
0
to 150V,
0
to 330V: Dual voltage type
or 120V
230 or 240V
(2)
AMMETERS
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
10A,
20A,
1OOA)
For
AC
fig.
8-2
For
AC
Fig.
8-3
(3)
FREQUENCY METER
I
Frequency range
:
About 45 to
65Hz
NOTE:
Be
careful
of
the frequency meter’s
input
voltage range.
Fig.
8-4
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21
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-1