TM 11-6625-1668-12
(4) Set the POWER switch to ON and adjust the FOCUS, ASTIG, INTENSITY, VERT and
HORIZONTAL POSITION for the best display.
analyzer in any one of three operating modes, AUTO, FREE RUN or INT.
(1) AUTO. With the TRIGGER & SWEEP SELECT switch set to AUTO the horizontal sweep is
generated within the oscilloscope. The method of generating the sweep is by means of a digital to analogue
counter converter. The sweep is triggered and reset by the analyzer and automatically adjusted to the analyzer
operating speed and code level. The input data signal to the analyzer will be displayed on the CRT. To view
single transitions the analyzer TRANSITION switch is set to select any transition, 1 through 9. The transition as
selected on the analyzer is the only transition displayed on the oscilloscope.
(2) Typical Operation, AUTO. The purpose of this operating procedure is to display on the oscilloscope
CRT, the data input to the analyzer automatically triggered, reset and adjusted to the analyzer operating speed.
The analyzer is assumed to be measuring distortion on 6 volt polar 5 level start-stop input during the
procedure. Initial control settings are listed below.
Control
Position
Control
Position
PWR switch.....................................
OFF
VERTICAL VOLTS (MA)/CM switch......
5
DISPLAY RELEASE RATE switch....
NORMAL
TIME MILLISEC switch ........................
The TIME
TRIGGER & SWEEP SELECT
AUTO
MILLISEC
switch ..............................................
switch is
Z MARKERS switch .........................
OFF
inoperative in
the AUTO
mode.
(a) Set the PWR switch to ON.
(b) Adjust the FOCUS, ASTIG, INTENSITY CRT, VERT POS and HORIZONTAL POSITION
controls for the best display.
analyzer operating speed.
(d) Set the analyzer TRANSITION switch to select any single transition displayed for measure-
ment.
(f) Set the Z MARKERS switch to ON and note that the brightness is intensified on the CRT for
each theoretically correct positions of an undistorted transition in the data signal.
(3) FREE RUN. In the FREE RUN operating mode the oscilloscope sweep is generated internally and
triggered by the analyzer. The free running sweep is unsynchronized and used to view crossover patterns.
(Set the DISPLAY RELEASE RATE switch to MAN when viewing crossover patterns.) Horizontal sweep rate is
variable from 0.05 to 500 milliseconds as controlled by the TIME MILLISEC switch and its corresponding
VARIABLE control to adjust the horizontal size of the displayed waveform.
(4) Typical Operation, FREE RUN. For the purpose of this procedure assume that the analyzer is
measuring distortion on a 180-volt, 60-ma neutral signal at 150 baud. Initial control settings are listed below.
Control
Position
Control
Position
PWR switch.....................................
OFF
Z MARKERS switch .............................
OFF
DISPLAY RELEASE RATE switch....
NORMAL
VERTICAL VOLTS (MA)/CM switch......
50
TRIGGER & SWEEP SELECT
FREE RUN
TIME MILLISEC switch ........................
6-50
switch ..............................................
(a) Set the PWR switch to ON.
(b) Adjust the FOCUS, ASTIG, INTENSITY CRT, VERT POS and HORIZONTAL POSITION
controls for the best display.
sweep controlled by the TIME MILLISEC switch and VARIABLE adjustment potentiometer.
(d) Set the DISPLAY RELEASE RATE switch to VARIABLE and note that the display release rate
is adjustable from 0.5 to 2 seconds as controlled by the DISPLAY RELEASE RATE potentiometer.
(5) INT, (EXT TRIG). When the oscilloscope is operated in the INT mode the horizontal sweep is
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