Tektronix 2465 User Manual

Controls, Connectors, and Indicators-2465 Operators
SGL SEQ-When armed
by pushing the MODE
switch down momentarily, the sweep runs one or
more times to produce a single sweep of each of
the traces defined by the following controls:
VERTICAL MODE, A and
B SECIDIV, and At.
Each sweep requires a distinct A Sweep triggering
event. The READY indicator remains illuminated
until the final trace in the sequence is completed.
At the end of the sequence the crt readout is
written once to present scale factors and other
readout data, and scale illumination flashes on
momentarily for oscilloscope photography
purposes.
B Trigger Modes:
RUN AFT DLY-The B Sweep runs immediately
after the established delay time has elapsed.
Delay time
is set by the A SECIDIV switch and
the A POS OR DLY REF control when no Delta
Time measurements are selected (neither At nor
I /At).
When either At or l/At measurements are made,
two delay times are established: one by the
A
REF OR D LY POS control and the other by the
A control.
TRlG AFT DLY-The
B Sweep runs when trig-
gered by
a triggering signal after the established
delay time has elapsed, provided the A Sweep has
not terminated. Since the
B Sweep runs at the
time the triggering signal occurs, the display
is
stable, even with jittering signals; but the actual
delay time
is greater than the delay-time setting.
Therefore, the crt readout shows
a question mark
in this mode.
@ SOURCE Switch and Indicators-Selects the trigger
signal source for either the
A or the B Sweep.
lndicators show the selection made. A single push of
the switch steps the SOURCE selection once; holding
the switch up or down causes the SOURCE selection
to step repeatedly. lndicators do not illuminate for
B triggering signals when RUN AFT DLY is selected.
VERT-The sweep triggers on the displayed chan-
nel when only one channel is selected. If multiple
vertical displays are selected, both the Trigger
MODE in use and position of the CHOPIALT but-
ton affect the trigger-source selection. When ALT
VERTICAL MODE is selected, each displayed
channel in turn provides the triggering signal, and
the respective LED indicator for each displayed
channel is illuminated, except in the case of AUTO
LVL MODE triggering. For AUTO LVL triggering or
CHOP VERTICAL MODE, the lowest numbered
channel, or ADD if it is displayed, is the triggering-
signal source. The LED indicator for the lowest
numbered channel displayed is illuminated, except
if ADD is selected. Then, the CH
1, CH 2, and
VERT indicators are illuminated.
CH
1, CH 2, CH 3, or CH 4-A triggering signal is
obtained from the corresponding vertical channel.
LINE (A Trigger Only)-A triggering signal is
obtained from
a sample of the ac power-source
waveform. This trigger source
is useful when
vertical input signals are time related (multiple or
submultiple) to the frequency of the ac
power-
source voltage.
COUPLING Switch and Indicators-Selects the
method of coupling the triggering signal to the A and
the
B trigger generator circuitry. A single push of the
switch steps the COUPLING selection once; holding
the switch up or down causes the COUPLING
selection to step repeatedly. lndicators show the
coupling method selected for either the A triggering
signals (when an A TRIGGER MODE is in effect) or
the
B triggering signals when TRIG AFT DLY is
selected for the
B TRIGGER MODE. lndicators do not
illuminate for
B triggering signals when RUN AFT DLY
is selected.
DC-All frequency components of the signal are
coupled to the trigger-generator circuitry. This
coupling method
is useful for triggering on most
signals.
NOISE
REJ-All frequency components of the
input signal are coupled to the trigger-generator
circuitry, but the peak-to-peak signal amplitude
required to produce
a trigger event is increased.
This coupling method
is useful for improving
trigger stability on signals accompanied by low-
level noise.
HF REJ-Attenuates h igh-frequency triggering-
signal components above
50 kHz. This coupling
method is useful for eliminating radio-frequency
interference and high-frequency noise components
from the signal applied to the trigger-generator
circuitry;
it allows stable triggering on the low-
freauencv comDonents of
a com~lex waveform.
REV FEB 1983

Tektronix 2465 Specifications

General

Brand	Tektronix
Model	2465
Category	Test Equipment
Language	English