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Polarity note: 2MC capacitors are polarity
conscious and correct battery connection must be
made. The smaller Lucar terminal blade (rivet
marked red), is positive and the larger double
Lucar connector torms the negative terminal.
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Conclusions :
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If meter reading is less than 9v, capacitor is
leaking (inefficient) and must be replaced.
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SECTION J25
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HOW TO MAKE UP A ONE OHM RESISTOR
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The 1 ohm resistor must be accurate otherwise
correct voltage (or current) values will not be
obtained.
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A suitable resistor can be made from 4 yards 18
S.W.G ( .048 in. dia.) NICHROME wire together with
two flexible leads and suitable crocodile clips,
see Fig. J8
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To Calibrate
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Bend the wire into two equal parts.
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(a)
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Fix a heavy gauge flexible lead to centre bend
of the wire, and connect this lead to the positive
terminal of a 6-volt battery.
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(b)
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Connect a voltmeter across the battery
terminals.
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(c)
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Connect an ammeter to the battery negative post.
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(d)
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Take a lead from the other terminal of the
ammeter, connect a crocodile clip to it, and
connect to the free ends of the wire (which should
be twisted together).
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(e)
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Move the clip along the wire, making contact
with both wires until the discharge reading on the
ammeter exactly equals the number of volts shown on
the voltmeter. The resistance is then 1 ohm.
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(f)
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Cut the wire at this point, twist the two ends
together and fix a second heavy gauge flexible
lead.
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(g)
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Wind the wire on to a hollow asbestos former 2
in. dia. (approximately).
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