TM 9-6625-1753-14
C1
Table 2-3. Delaying Sweep Plug-In, Controls, Indicators, and Connectors
Table 2-3. Delaying Sweep Plug-n, Controls, Indicators,
(Fig. 2-6) - Continued.
and Connectors (Fig. 2-6) -Continued
Key
Control, Indicator or Connector
Function
Key
Control, Indicator or Connector
Function
TRIG-STROBE: Both the normal and delayed
14
PULL EXT 10 switch
Extends the range of the voltage (100 volts) which
sweeps are displayed. The delayed sweep appears
the triggering signal must exceed before the delayed
as a bright segment (strobe) superimposed on the
sweep fires.
normal sweep.
15
DLY ZERO control
Screwdriver adjustment for calibrating the DELAY
TRIG-DLY'D: Only the delayed sweep is displayed.
VERNIER control to provide a precise zero adjust
The bright segment is expanded to cover the entire
ment.
CRT screen.
18
SLOPE switch
"+" Position: Triggering pulse fires the delayed sweep
ARM-STROBE: Functions the same as TRIG-
on the positive-going portion of the input signal.
STROBE mode, except that the delayed sweep
"-" Position: Triggering pulse fires the delayed sweep
(strobe) starts after the selected delay interval,
on the negative-going portion of the input signal.
when the delay sweep circuit receives a trigger.
20
COUPLING switch
Three-position switch. Selects the following modes of
ARM-DLY'D: Functions the same as TRIG-DLY'D,
coupling the input signal to the triggering circuit
except that the sweep starts after the selected de-
in the delayed sweep circuit.
lay interval, when the delayed sweep circuit
AC: Input signal is coupled through a high-pass
receives a trigger.
filter having a frequency cutoff of 80 cycles.
X AMP: Permits an external source to be substituted
ACF: Input signal is coupled though a high-pass
in place of the internal sweep circuits.
filter having a frequency cutoff of 10 cycles.
13
POSITION control
Positions the trace horizontally.
DC: Input signal is coupled direct. This mode pro-
13
PULL X10 switch
Expands the sweep, magnifying the display 10 times.
vides optimum trigger sensitivity when very low
17
UNCAL indicator
Indicates that the sweep vernier control is operational
frequency waveforms are monitored.
and the sweep time is no longer calibrated.
21
SOURCE switch
Three-position switch. Selects the source of the trigger
37
DELAY VERNIER control
Controls the distance on the CRT screen from the start
that is applied to the delayed sweep.
of the normal sweep to where the delayed sweep is
INT: Internal trigger derived from the input signal.
either triggered or armed.
EXT: External trigger coupled through EXT TRIG
35
SWP READY indicator
Indicates that the delayed sweep is armed and ready to
connector.
be triggered.
LINE: Internal trigger derived from the 6.3 vac
16
Beam position indicators
Arrow next to glowing lamp indicates the direction that
source. Trigger rate depends on powerline fre-
the trace is deflected off the CRT screen.
quency.
19
EXT TRIG-X AMP connector (BNC
Connects external trigger to delayed sweep. In addition
connector)
it connects an external signal directly to the hori-
Section III. OPERATION UNDER USUAL CONDITIONS
zontal deflection amplifier.
22
SWP CAL control
Screwdriver adjustment to compensate for difference
Note. The following text, channel A is used interchangeably with channel 1, and channel B with channel 2. In
in deflection plate sensitivities when the delaying
each remaining case where there is a difference between oscilloscopes FD-765MH and FD-765MH/F, the name of the
sweep plug-in is switched from one cavity in the
control and/or the control setting applicable to oscilloscope FS-765MH/F is given in parenthesis.
main frame to the other.
23
"+" GATE connector (banana jack)
Provides a positive pulse of approximately 2.5 volts
which is time-coincident with the delaying sweep.
2-7. Starting Procedure
28
TIME/DIV switch
Selects the normal sweep speed. Provides calibrated
sweeps (time per division) of 0.1 microseconds to 2
a. With the SCALE ILLUM switch set to OFF, connect the power cord to the connector (3) Delaying sweep plug-in at the
seconds in twenty-three steps.
rear of the oscilloscope and then to the power source, 105 to 125 volts or 210 to 250 volts alternating current (ac).
26
DELAYED SWEEP-PULL TO UNLOCK
When pulled and rotated it selects the delayed sweep
switch (black knob)
speed. Provides calibrated sweeps of 0.1 microseconds
Caution: Make sure the .230V-115V switch on the main frame is set to the proper position.
to 2 seconds in twenty-three steps.
24
Sweep vernier control
Varies the normal or delayed sweep (when rotated
counterclockwise from the CAL position), depending
b. Set the controls as follows:
on the position of the DISPLAY LOGIC switch.
(1) Main frame
12
DISPLAY LOGIC switch
Five-position switch. Selects sweep operational mode.
INTENSITY control............................................................................................fully counterclockwise
NORM: Only the normal sweep is displayed. It can
ASTIG control ...................................................................................................midposition
be triggered internally by the displayed signal or
FOCUS control .................................................................................................midposition
by a signal applied to the lower EXT TRIG con-
(2) Dual trace plug-in
nector.
MODE switch....................................................................................................A (CH1)
VOLTS/DIV switch ............................................................................................10
POSITION control .............................................................................................midposition
(3) Delaying sweep plug-in
DISPLAY LOGIC switch ....................................................................................NORM
NORMAL AND DELAYING TRIGGERING LEVEL control....................................0
NORMAL AND DELAYING TRIGGERING COUPLING switch .............................DC
2-3
