TM 11-6625-2735-14-1
21. Check Sweep Length and Horizontal
POSITION Range
a. Set time-mark generator for 1 millisecond time
marks.
b. CHECK—Sweep length for approximately
10.1 divisions.
c. Turn POSITION and FINE (Horiz) controls fully
clockwise. (Also check that each control will position the
trace.)
d. CHECK—That the start of sweep is to the right of
graticule center.
e. Turn POSITION and FINE (Horiz) controls fully
counterclockwise.
f. CHECK—That the end of sweep is to the left of
graticule center.
g. Recenter POSITION and FINE (Horiz) controls.
22. Check A Timing Accuracy
a. Set TIME/DIV to 0.01 set the time-mark
generator for 10 nanosecond time marks, set TRIG MODE
to NORM, and set A TRIGGER LEVEL for a stable
triggered display.
NOTE
Unless otherwise stated, set POSITION and FINE
(Horiz) controls so first time mark will coincide with
first graticule line and check that a time mark will
coincide with last vertical graticule line.
b. CHECK—TIME/DIV settings from 0.01 to
5 ins/division for accuracy, at first and 11th graticule lines,
within 1%, from +20°C to +30°C; within 3%, from –15°C
to +55°C.
NOTE
Turn INTENSITY full on, note the start of sweep and
exclude the first 25 nanoseconds from start of
sweep when checking 0.01 and 0.02 divislon. Set
time-mark generator, as necessary, to provide 1 or
more time marks/division as each TIME/DIV setting
is selected, throughout the horizontal check
procedure.
c. CHECK—TIME/DIV settings from 10 ms to
0.5 s/division for accuracy, at first and 11th graticule lines,
within 2%, from +20°C to +30°C; within 3%, from –15°C
to +55°C.
23. Check A INTEN Timing Accuracy
a. Set HORIZ DISPLAY to A INTEN, set TIME/DIV to
0.05 and set time-mark generator for 50 nanosecond
time marks (DELAY TIME POSITION should be fully
counterclockwise).
b. CHECK—TIME/DIV settings from 0.05 to
0.5 s/division for accuracy, at first and 11th graticule lines.
within 2%, from +20°C to +30°C; within 3%, from —15°C
to +55°C.
24. Check A INTEN Magnified timing Accuracy
a. Set TIME/DIV to 0.05 set time-mark generator
for 5 nanosecond time marks and press X10 MAG to on.
b. CHECK—TIME/DIV settings from 0.05 to
0.5 s/division for accuracy, at first and 11th graticule lines,
within 3%, from +20°C to +30°C; within 4%, from –15°C
to +55°C (see following note).
NOTE
Turn INTENSITY fully on, note the start of sweep
and exclude the first 25 nanoseconds from start of
sweep or first 2 major unblanked divisions at norms/
intensity (whichever is greater) and all beyond the
100th division.
25. Check A Magnified Timing Accuracy
a. Set TIME/DIV to 0.01 set A TRIGGER SOURCE
to EXT and set A TRIGGER COUPLING to LF REJ.
b. Set the time-mark generator for 2 nanosecond time
marks and connect trigger output through a 42-inch 50-
ohm BNC cable, to a 50-ohm BNC termination, to A
TRIGGER external input (if a 2901 time-mark generator is
used, set trigger selector for 0.1 microsecond triggers).
Insert a 500 megahertz filter between the 50-ohm BNC
termination and CH 1 input. Adjust the filter for minimum
unwanted modulation from the time mark generator, as
necessary, whenever 2 or 5 nanosecond time marks are
used in this step.
5-16
To Next Page
Loading...
Need help?
General
