Controls, Connectors, and Indicators-2465 Operators
LF REJ-Signals are capacitively coupled, and the
dc component of the triggering signal
is
blocked.
Attenuates the low-frequency signal components
below 50 kHz. This coupling method
is
useful for
producing stable triggering on the high-frequency
components of
a
complex waveform. Low-
frequency components such
as
power-supply hum
are removed from the signal applied to the trigger-
generator circuitry.
AC-Signals are capacitively coupled. Frequency
components below 60 Hz are attenuated, and the
dc component of the input signal
is
blocked. This
coupling method
is
useful for signals that are
superimposed on slowly changing dc voltages.
This method will work for most signals when
trigger-level readout
is
not desired.
A/B TRlG Switch-Directs the MODE, SOURCE,
COUPLING, SLOPE, and LEVEL controls to either
the A Trigger or the B Trigger, under the allowed
switching conditions. Controls are normally directed
to the A Trigger when the A and B SEC/DIV knobs
are locked together (A Sweep display only). Controls
are normally directed to the B Trigger when the
B TRIGGER MODE
is
set to TRlG AFT DLY and
the A and B SECIDIV knobs are unlocked (PULL-
INTEN, TU R N-ALT, or PUSH-B Horizontal Display
Mode). Pressing and holding in the A/B TR lG switch
will direct the trigger controls away from their
normal trigger direction, but releasing the A/B TRlG
switch will redirect the trigger controls back to the
original triggers.
If the A and B
SECIDIV knobs are unlocked and
either the B TRIGGER MODE
is
set to RUN AFT
DLY or the A TRIGGER MODE
is
set to SGL SEQ,
the A/B TRlG switch will direct the trigger controls
to the opposite trigger each time
it
is
momentarily
pressed and released.
Locking the A and B SECIDIV knobs together will
switch the trigger controls to the
A
Trigger if they
are currently directed to the B Trigger. Pulling the
B SECIDIV knob to the out position will cause the
trigger controls to revert to the B Trigger if the B
TRIGGER MODE
is
set to TRlG AFT DLY. How-
ever, if the
B
TRIGGER MODE
is
set
to RUN AFT
DLY when the B SECIDIV knob
is
unlocked from
the A SECIDIV knob, the trigger controls remain
directed to the A Trigger until the B Trigger
is
reselected by the A/B TR IG switch.
LEVEL Control-Sets the amplitude point on the
triggering signal at which either A or B Sweep
triggering occurs. This control produces fine resolu-
tion for
a
portion of
its
range, after which
it
changes
to coarse resolution.
It
reenters the fine-resolution
range upon reversing the direction of rotation.
When the A TRIGGER MODE
is
set to AUTO LVL,
the effect of the LEVEL control
is
spread over the
A Sweep triggering-signal amplitude from peak to
peak. In this case, rotating the control to either
extreme causes the triggering level to be redefined
by the AUTO LVL circuitry.
SLOPE Switch and Indicators-Select the slope of
the signal that triggers either the
A
Sweep or the
B Sweep. Indicators illuminate to show slope selec-
tion made for the A Sweep and for TR lG AFT DLY
B Sweeps. The
+
and
-
indicators do not illuminate
for B triggering when RUN AFT D LY
is
selected.
A SWP TRIG'D Indicator-Illuminates to indicate
that the A Sweep
is
triggered.
It
extinguishes after
a
nominal length of time when
a
triggering signal
is
not received following completion of the sweep.
READY Indicator-Illuminates when SGL SEQ
MODE
is
selected and the A Sweep
is
armed and
waiting for
a
triggering event to occur.
It
extinguishes
following the completion of all the traces selected
for the SG
L
SEQ display.
HOLDOFF Control-Varies the amount of holdoff
time between the end of the sweep and the time
a
triggering signal can initiate the next sweep. The
ability to obtain stable triggering on some aperiodic
signals
is
improved using this control. In the B ENDS
A position (fully clockwise) trigger holdoff time
is
reduced to minimum, and the A Sweep terminates
immediately
at
the end of the B Sweep. This enables
the fastest possible sweep-repetition rate
at
slow A
Sweep speeds.
REAR PANEL
Refer to Figure
3-6
for location of items
43
through 50.
@)
A GATE OUT and B GATE OUT Connectors-
Provide TTL-compatible, positive-going gate signals
that are HI during their respctive sweeps and LO
while the sweep
is
not running. When the A SECI
DIV switch
is
set to
5
ns per division, an output
gate
is
present
at
both the A GATE OUT and the
B GATE OUT connectors.
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