TM 11-6625-2735-14-1
k. CHECK—For control of graticule illumination from
minimum to maximum settings.
I. Set the amplitude calibrator for a 20 millivolt output
and connect to CH 1 input through a 42-inch 50-ohm BNC
cable.
m. Set A TRIGGER LEVEL for a stable display.
n. CHECK—For well-defined focusing on front cor-
ners of the displayed waveform.
o. ADJUST—FOCUS control and ASTIG (front panel
screwdriver adjustment) together for the best-defined
front corners on the displayed waveform.
p. Turn INTENSITY fully counterclockwise and press
BEAM FINDER pushbutton.
q. CHECK—For a compressed waveform of normal
intensity, within graticule area.
r. Release BEAM FINDER pushbutton and return
INTENSITY to a normal setting.
2. Check Vertical Input Functions
a. Position the bottom of CH 1 display to the center
horizontal graticule Iine.
b. Set CH 1 AC-GND-DC switch to GND.
c. CHECK—For no vertical deflection and that trace is
at center horizontal graticule line.
d.
e.
Set CH 1 AC-GND-DC switch to AC.
CHECK—That display
IS centered in graticule area.
Move test signal cable to CH 2 input and set VERT
f.
MODE to CH 2.
g. Position the bottom of CH 2 display to the center
horizontal graticule line.
h. Set CH 2 AC-GND-DC switch to GND.
5-6
i. CHECK—For no vertical deflection and that trace is
at center horizontal graticule line.
j. Set CH 2 AC-GND-DC switch to AC.
k. CHECK—That display is centered in graticule area.
l. Disconnect all test equipment.
m. CHECK—That the light under 5 mV of CH 2
VOLTS/DIV knob is on.
n. Connect a 10X probe with a scale-factor switching
connector to CH 2 input.
NOTE
Use a probe listed in test equipment required, Table
5-1, under 10X Probe examples.
o. CHECK—That the light under 5 mV is extinguished
and the light under 50 mV comes on.
p. Set VERT MODE to CH 1.
q. CHECK—That the light under 5 mV of CH 1
VOLTS/DIV knob is on.
r. Move the 10X probe to CH 1 input.
s. CHECK—That the light under 5 mV is extinguished
and the light under 50 mV comes on.
t. Remove the 10X probe.
3. Check CH 1 and CH 2 GAIN
a. Set the amplitude calibrator for a 20 millivolt output
and connect to CH 1 input through a 42-inch 50-ohm BNC
cable.
b. Set CH 1 and CH 2 AC-GND-DC switches to DC.
c. CHECK—The display for 4 divisions of amplitude.
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