Biddle MEGGER - Page 9

FIGURE 5. Connections for making a time-resistance meas-
urement on one phase of a generator winding with the other
phases grounded.
3. Hand-Driven Midget Mark IV Type
ACCURACY
UNAFFECTED
BY VOLTAGE
VARIATION
IMPROVED AC
BRUSHLESS,
GENERATOR
IMPROVED
INSULATION
EXTENDED SCALE
CONTINUITY
SCALE
RUGGED
NEW STYLE
CASE
FIGURE 6
See General Directions for Hand-Driven Types, page 1.
Turn the crank at just above the speed at which the constant:
voltage clutch is felt to slip, which is about 160 rpm.*
* Some instruments have a constant voltage generator in place of a slip
clutch. These instruments should also be cranked at approximately 160 rpm.
Many older superseded instruments had variable voltage generators. In
these instruments the output voltage varied with cranking speed.
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