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(32) A Control—Sets the alternate B Sweep delay time or
positions the Delta-time cursor (vertical line) when
either the At or 1/At Measurement Mode is active.
When the AV Measurement Mode is active (A Sweep
Horizontal Display Mode only), the control positions
one of the two horizontal voltage cursors that appear
on the crt display.
This control produces fine resolution over a portion
of its range, after which it changes to coarse reso-
lution,
It reenters the fine-resolution range upon
reversing the direction of rotation.
TRACKING-OUT:INDEP Switch—Selects either the
TRACKING or INDEP (independent) mode for the
A REF OR DLYPOS control. When in the TRACK-
ING mode (push button latched in), the difference
between alternate delay times or cursors (in either
time or volts Measurement Mode) does not change
with rotation of the A REF OR DLY POS control.
When the A REF OR DLY POS control is rotated,
the positions of both delays or of both cursors move
equally until the limit of either is reached.
If OUT:INDEP is selected (push button released),
the cursors (or delay positions) are independently
movable using the A REF OR DLY POS and A
controls. In either mode (TRACKING or INDEP)
the
Delta cursor remains independently movable
using the A control.
TRIGGER
Refer to Figure 3-5 for items 34 through 42.
MODE Switch and
Indicators—Selects the trigger
mode of either the A Sweep or the B Sweep. A single
push of the switch steps the MODE selection once;
holding the switch up or down causes the MODE
selection to step repeatedly. Indicators show the
selected trigger mode of either the A Sweep or the
B Sweep according to the selected Horizontal Display
Mode andas directed by the A/B TRIG switch.
A Trigger Modes:
AUTO LVL—Automatically establishes the trigger
level on a triggering signal and free runs the sweep
in the absence of a triggering signal. The LEVEL
control covers a range between the positive and
negative peaks of repetitive triggering signals. If
the triggering signal amplitude changes, the trigger
level does not change unless a trigger is no longer
produced
at the
established
level. The signal
peak-reference levels and the trigger level are
redefined whenever triggering ceases, whenever the
Controls, Connectors, and Indicators—2465 Operators
LEVEL control is turned to either extreme, or
when the MODE switch is pushed up. If the
LEVEL control is set near either end position, the
trigger level set by AUTO LVL will be near the
corresponding signal peak. If the LEVEL control is
set in the midrange between either end, the trigger
level set by AUTO LVL will be near the midpoint
of the trigger signal amplitude. The established
trigger level
remains in effect when switching
to AUTO or NORM Trigger MODE unless the
LEVEL control is moved.
lf VERT TRIGGER SOURCE is selected, the
lowest-numbered
displayed
channel
(or
the
algebraic sum of Channel 1 and Channel 2 if ADD
vertical display is selected) becomes the trigger-
signal source. If Trigger MODE is changed from
AUTO
LVL to AUTO while more than one
channel
is displayed, the single-channel trigger
source
is
retained,
and
the
VERT SOURCE
indicator is turned off. To regain the VERT
TRIGGER SOURCE, press up momentarily on
the SOURCE switch.
AUTO—Sweep free runs in the absence of a
triggering signal. The triggering level changes only
when the LEVEL control is adjusted to a new
position.
NORM-—Sweep
is triggered
and
runs when a
triggering
signal
compatible with
the
LEVEL
setting is applied. Sweep free runs either when the
input coupling of the selected trigger SOURCE is
set to GND or when the input coupling of both
Channel 1 and Channel 2 is set to GND, with
ADD, VERTICAL MODE, and VERT TRIGGER
SOURCE selected.
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3832-08
Figure 3-5. Trigger controls and indicators.
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