TESCO Phase Sequence Indicator
Catalog No. 500
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TESCO Phase Sequence Indicator
Catalog No. 500
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The TESCO Phase Sequence Indicator meets the need for an instrument
that is lighter and more compact than any heretofore available.
Phase sequence is indicated by two neon lamps. One lamp for phase
sequence 1-2-3 and the other lamp lights for phase sequence 3-2-1.
Where the voltages are symmetrical and equal, one lamp will always
be out. When testing unsymmetrical voltages (such as two phase wires
and the neutral of a Y system) one lamp will be bright and the other
dim; the phase sequence will then be that indicated by the brighter
lamp.
The TESCO Phase Sequence Indicator can be used on polyphase voltages
from 115 V. to 600 V., at 60 cycles. The instrument is completely
self-contained, and does not require a rangechanging switch. There
are no moving parts, and the two leads are permanently attached
to the body. The three electrodes are conspicuously numbered,
to facilitate phase identification.
The instrument is extremely easy to use. The lead with the clip
(#2) is attached to one phase terminal. The insulated prod (#1)
is then touched to the second phase terminal and the prod (#3)
on the end of the instrument body is touched to the third phase
wire: the positions of the prods can be quickly interchanged to
reverse the indication.
The body of the instrument is made of insulating material and
measures 1 inch (2.54 cm) in diameter and 6 3/8 inches (16.17
cm) long overall.
The total weight including leads, is four ounces (.114 kilos).
The entire device can be conveniently carried in a pocket.
The TESCO Phase Sequence Indicator is packaged individually in
a flat zip-lock plastic packet.
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