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7.
MEASURING PROCEDURES
7-1 METERS
7-l-l VOLTMETERS
Both AC and DC voltmeters are necessary.
Measurable range of the AC voltmeter is as
follows.
0 to 15OV: For a voltmeter with an
output voltage of 110 or 120V
0 to 300V: For a voltmeter with an
output of 220, 230, or 240V
Measurable range for the DC voltmeter is
from 0 to 20V.
7-l-2 AMMETER
Both AC and DC ammeters are necessary.
The AC ammeter must have a scale range
from 0 to approximately 15A, and the DC
ammeter also must have a scale range from 0
to approximately 15A.
7-l-3 FREQUENCY METER
The frequency meter must have a scale range
from 45 to approximately 65 Hz.
Note: Note the input voltage range for the
frequency meter.
For AC
For DC
Fig. 7-l- 1
For AC
For DC
FI& 7-l-2
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1
Fig. 7- l-3
-18-