ohmmeter, with the R x 10,000 scale selected, to
pins Z and Y of receptacle J1.
( b ) With the positive lead connected to pin
Y and the negative lead to pin Z, the ammeter will
read approximately 6 amperes up scale.
( c ) Reverse the connections at receptacle
J1 so that the positive lead is connected to pin Z and
the negative lead is connected to pin Y.
( d ) The ammeter will read approximately
6 amperes down scale.
( e ) Disconnect the ohmmeter and test leads.
(13) Voltage adjusting rheostat test
( a ) Connect a Simpson 260 or equivalent
ohmmeter; with the R x 100 scale selected, across
pins small z and large U of receptacle J1.
( b ) Place the VOLTAGE SENSING switch
to the LOCAL position.
( c ) Rotate the VOLTAGE ADJUST rheostat
from stop to stop, the resistance will vary from 0
to 250 + 10 percent ohms,
( d ) Rotate the VOLTAGE ADJUST rheostat
until 125 ohms are indicated on the ohmmeter and
disconnect the test leads.
(14) Frequency adjust rheostat test
( a ) Connect a Simpson 260 or equivalent
ohmmeter; with the R x 100 scale selected, across
pins N and T of receptacle Jl. The resistance in-
dicated should be 500 ohms ± 10 percent.
( b ) Remove the test lead from pin T and
place it in pin M.
( c ) Rotate the FREQUENCY ADJUST rheo-
stat from stop to stop, the resistance should vary
from 0 to 500 ± 10 percent ohms.
c. Installation. Refer to Operator and Organi-
zational Maintenance Manual and install the control
cubicle.
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