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|  MIL-M-82433A(OS)
(a) Connect input A and external trigger of oscilloscope to SCOPE
INPUT terminals of Figure 4. Position oscilloscope control as follows:
Position
Control
A, DC
INPUT SELECTOR
AC Fast
TRIGGER MODE
EXT+
TRIGGER SLOPE
FULLY CW
TRIGGER STABILITY
FULLY CW
TRIGGER LEVEL
100 MICRO SEC
TIME/CM
5X MULTIPLIER
OFF
MULTIPLIER
5
10
MILLIVOLTS/CM
MV/CM MULTIPLIER
2
VARIABLE
CALIBRATED (FULLY CW)
(b) Accelerate motor from rest with no-load with the motor connected
to the circuit shown in Figure 4. A continuous sweep should appear on
the oscilloscope. Turn sweep stability control on oscilloscope in a CCW
direction until trace just disappears. Place MOTOR REVERSING switch (Fig-
ure 4) to CW position and depress MOTOR START switch (Figure 4) to cause
motor to run. Continue derressing and releasing MOTOR START switch and
adjust triggering level control in a CCW direction until a single sweep
is obtained when MOTOR START switch is depressed.
(c) Position TIME/CM switch on oscilloscope to 10 MILLISEC. Depress
MOTOR START switch. Using the VERTICAL POSITION, MV/CM MULTIPLIER, and
VARIABLE controls on the oscilloscope, position steady state motor current
trace at bottom line on graticule and peak motor current trace 5 cm above
bottom line on graticule (see Figure 5).
(d) Position TIME/CM switch on oscilloscope to 1 MILLISEC. Position
HORIZONTAL POSITION control on oscilloscope so that trace crosses grad-
uated vertical center line between 1.6 and 1.8 cm above bottom line when
MOTOR START switch is depressed (see Figure 5). Record distance from
triggering point to vertical center line. Calibration is 5 ins/cm. The
time constant shall be less than 12 ms. The reading shall be taken with
an accuracy of 1.0 ms.
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