106

These instruments are sensitive, and can be used on very-low power factors.

(9) " Kelvin" Insulation Testing Set consists of a very sensitive galvanometer, fitted with controlling magnet, set of shunts, set of compensating resistances, with two-way switch. It is made in two forms, moving magnet type for ordinary testing, and moving coil type for use where stray fields abound. The readings of this instrument are unaffected by capacity effects in cable testing.

(10) " Kelvin " Multicellular Voltmeters (Fig. 10) are shown in two forms, the vertical scale pattern, and the horizontal scale, or portable pattern. They are operated by electrostatic forces, and are, therefore, unaffected by external magnetic fields.

FIG. 10.

VOLTS '

0 100 150 200 25

U o

They read correctly on continuous or alternating current circuits, and are independent of wave form and frequency, and require practically no energy to operate them.

The range can be extended by means of a multiplier.

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