TM 9-6625-1753-14
C2
Step
Operation
Normal Indication
Corrective procedure
Step
Operation
Normal Indication
Corrective procedure
Refer to the dual trace plug-in func-
The SWP READY indicator lamp (35) illuminates.
Check the electronic switch or blanking
Refer to the delaying sweep plug-in
e.
With the LEVEL control (36) near either extreme, touch the probe tip to the CAL IV output connector.
A single trace appears momentarily on the screen.
12.
Check Chop Mode Operation.
Set the MODE switch to CHOP.
The SWP READY indicator lamp extinguishes.
Refer to the delaying sweep plug-in
The two waveforms appearing on the screen are chopped.
Refer to the dual trace plug-in func-
Check delayed sweep circuit of the de-
Check the electronic switch or the blank-
laying sweep plug-in.
f.
Set the LEVEL control (36) to 0.
trace plug-in.
9.
Check Attenuator Balance.
a. Set the DISPLAY LOGIC switch to NORM.
13.
Check A + B Mode Operation.
a. Adjust both of
the vertical POSITION and VARIABLE controls until the waveforms are superimposed and are two
b. Set the SOURCE switches to LINE.
divisions in amplitude.
c. Adjust the channel A POSITION control (5 or 56) until the trace rests on the graticule centerline.
b. Record the amplitude of the superimposed waveform.
d. Set the channel A VOLTS/DIV switch to positions .055 through 10 or .1 through 20).
c. Set the MODE switch to A + B (or ADDED).
The trace remains in the same vertical position as in c above for each of the switch
The amplitude of the square-wave display doubles.
settings.
Center the waveform on the CRT with
e.
Set the MODE switch to B (or CH2).
either the channel A or channel B
f.
Repeat steps c and d for channel B.
POSITION controls if necessary.
Refer to the dual trace plug-in func-
10.
Check Vertical Variable Controls.
a. Set the MODE switch to A (or (CH1).
Check the electronic switch circuit of
b. Set the channel A VOLTS/DIV switch to CAL.
the dual trace plug-in.
c. Rotate the channel A VARIABLE control (3 or 59) fully counterclockwise.
d.
Set the channel B NORM-INVERT switch (49 or 71 ) (and the AC-DC-GND switch-68) to INVERT AC.
The amplitude of the waveform appearing on the screen decreases.
Center the waveform on the CRT with
The two signa ls cancel each other and a straight line (trace line) appears on the
the channel A POSITION control if
screen.
Center the display on the CRT with
necessary.
either the channel A or channel B
Refer to the dual trace plug-in func-
POSITION controls if necessary. Refer
to the dual trace plug-in functional
d.
Repeat steps h and c for channel B.
11. Check Alternate Mode Operation.
a. Rotate both the channel A and channel B VARIABLE controls (3 and 46 or 59 and 67) to midrange.
b. Set the, MODE switch to ALT.
Two flickering waveforms are present on the screen.
Adjust the vertical POSITION controls
(5 and 44 or 56 and 65) to separate the
two waveforms.
2-11