Trigger - Tektronix 2235A Instruction Manual

Operatlng lnstructlons- 2235A lnstructlon
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Horizontal MODE Swltch
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Determines the mode
of operation for the horizontal deflection system.
A-Horizontal deflection is provided by the A
Sweep generator at a sweep speed determined
by the A SECIDIV switch setting.
ALT-Alternates the horizontal displays
between the A Sweep (with an intensified zone)
and the B Delayed Sweep. The A Sweep speed
is determined by the setting of the A SECIDIV
switch. The B Sweep speed and the length of
the intensified zone on the A Sweep are both
determined by the B SECIDIV switch setting.
B-Horizontal deflection is provided by the B
Sweep generator at a sweep speed determined
by the B SECIDIV switch setting. The start of the
B Sweep is delayed from the start of the A
Sweep by a time determined by the settings of
both the A SECIDIV switch and the B DELAY
TlME POSITION control.
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B
DELAY TlME POSITION Control-Selects the
amount of delay time between the start of the A
sweep and the start of the B Sweep. Delay time is
variable from 0.5 times to 10 times the A SECIDIV
switch setting.
Figure
2-5.
Horizontal controls and indicator.
TRIGGER
Refer to Figure 2-6 for location of items 24 through 34.
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A and B SECIDIV Varlable Control and XO Mag-
nlfier Switch
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Provides continuously variable,
uncalibrated A Sweep speeds to at least 2.5 times
the calibrated setting. It extends the slowest sweep
speed to at least 1.25 s per division.
To expand the crt display by a factor of 10, pull out
the XI 0 Magnifier control (SECIDIV Variable control
knob). The display portion of the sweep will be 10
times faster than the A and B SECIDIV switch set-
tings. This allows a maximum sweep speed of 5 ns
per division. Push in the SECIDIV Variable knob to
regain the XI (normal) sweep speed.
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POSITION Control- Horizontally positions the A
Sweep display, B Sweep display, and X-axis in X-Y
mode.
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A TRIGGER Mode Switches-Determine the A
Sweep triggering mode.
NORM -Sweep is initiated when an adequate
trigger signal is applied. In the absence of a trig-
ger signal, no baseline trace will be present.
P-P AUTOrrV LINE
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Permits triggering on trig-
ger signals having adequate amplitude and a
repetition rate of about 20 Hz or faster. In the
absence of a proper trigger signal, an
autotrigger is generated, and the sweep free
runs. The range of the A TRIGGER LEVEL control
is restricted to the peak-to-peak range of the
trigger signal. P-P AUTO is the usual trigger
mode selection to obtain stable displays of TV
Line information.
Scans by
ARTEK MEDIA ==-