lead of the electrical headset into the pile flutter
(see note below). It will apply a variable cur-
circuit.
rent load of 0-12.5 amperes on units undergoing
t e s t with an operating voltage rating of 15
c. Negative and Positive Binding Posts. T h e
volts and below and a variable current load of
negative and positive binding posts (35-B) of
0-25 ampere on units with an operating voltage
the pile flutter circuit are a two-piece post as
rating above 15 volts to 30 volts. To apply the
to connect the pile flutter circuit to the carbon
current load it is rotated clockwise to increase
the load and counterclockwise to decrease the
means of two test leads.
load.
N o t e . The load switch (38) must be in the "ON"
46. Regulator Check Fixed Resistance Cir-
p o s i t i o n to connect the variable control (37) in the
cuit Instrument Panel (Designated as
circuit of the test stand or in series with the other load
REGULATOR CHECK FIXED RESISTANCE
s w i t c h e s (39), (40), and (57).
METHOD (OHMS), REGULATOR CHECK
INPUT)
as LOAD SWITCHES 0-25 0-12.5)
a. G e n e r a l . The regulator check fixed resis-
The 0-25 0-12.5 load switch (38), located on
t a n c e circuit consists of two units which are
the upper right hand end of the main control
located on an instrument panel (36). The units
p a n e l , is a 50-ampere at 30-volts dc, toggle
of the circuit are used to check the setting of
switch used to connect a current load of 0-25
a voltage regulator unit (figs. 33, 34, and 35)
o f a generator regulator (par. 102). The two
and 0-12.5 amperes in the circuit with the 0-25
units of this circuit and their description and
0-12.5 ampere load switch variable control
function are given in b and c b e l o w .
(37), which is applied as specified in paragraph
47. The current load of
this switch can be used
b . Fixed Resistance Selector Switch. T h e
i n d i v i d u a l l y or in conjunction with the fixed
f i x e d resistance selector switch (36-A) is a
load switches (39), (40), and (57) when apply-
1 0 - p o s i t i o n (position between marked resist-
ance positions open circuit), 1-pole, 1-deck, ro-
ing loads on units undergoing test.
tary type selector switch used to select a fixed
49. 25-12.5 and 50-25 Fixed Load Switches
(Designated as LOAD SWITCHES 25-12.5
50-25)
ohms, 2.25 ohms, and 7.0 ohms by setting the
switch in these marked positions on the dial of
The 25-12.5 and 50-25 fixed load switches
the switch.
(39) and (40), located near the right hand cen-
ter of the main control panel, are both a 50-am-
c. Regulator Check Input Binding Post. T h e
pere at 30 volts dc, single-throw, toggle switch.
r e g u l a t o r check input binding post (36-B) is
a threaded two-piece post as described in para-
The load switch (39) is used to apply a fixed
current load of 0-12.5 amperes on units under-
resistance, b above, into a dc circuit undergoing
going test with an operating voltage rating of
test.
15 volts and below and a fixed current load of
0-25 amperes on units with an operating volt-
47. 0-25 0-12.5 Ampere Load Switch Vari-
age rating above 15 volts to 30 volts. The load
able Control (Designated as VARIABLE
switch (40) will apply a fixed current load of
LOAD 0-25 0-12.5 AMPS INCREASE)
0-25 on units with an operating voltage rating
The 0-25 0-12.5 ampere load switch variable
of 15 volts and below and a fixed current load
control (37), located on the upper right hand
o f 0-50 amperes on units with an operating
e n d of the main control panel, is a 45-ohm,
voltage rating above 15 volts to 30 volts. The
taper wound rheostat and can be used in con-
switches may be used individually or in con-
j u n c t i o n with the fixed load switches (39),
j u n c t i o n with the other load switches (37),
( 4 0 ) , and (57). The control is connected in
s e r i e s with the 0-25 0-12.5 load switch (38)
( 3 8 ) , and (57).