Tektronix 2246 User Manual

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Channel
3
and
Channel
4
VOLTS/DIV
Switches—.
Select
either
of
two
basic
deflection
factors
for
Channel
3
and
Channel
4.
When
the
VOLTS/DIV
button
light
is
off,
the
deflection
factor
is
0.1
V
per
division
(using
a
X1
probe
or
a
coaxial
cable
input
connection);
when
it
is
on,
the
deflection
factor
is
0.5
V
per
division.
CH 3 and CH 4 input Connectors—-Connect exter-
nal signals to the inputs of Channel 3 and Channel 4
vertical attenuators via DC input coupling only.
The input connectors are BNC with probe-coding
ring contacts (the same as the Channel 1 and Chan-
nei 2 connectors). The limited choice of deflection
factors for the Channel 3 and Channel 4 inputs
makes them most useful for the application of digital
signal levels and trigger-signal-input channels. In X-Y
mode, signals applied to either or both input connec-
tors may be selected to provide a vertical deflection
(Y-Axis) signal.
HORIZONTAL
See Figure 3-4 for items 24 through 32.
©
POSITION Control-—Sets the horizontal position of
the waveform displays on the crt. Clockwise rotation
of the POSITION control will move the display to the
right.
X10 MAG Switch—Horizontally magnifies the por-
tion of all the normal sweep displays positioned at
the center vertical graticule line by a factor of 10
when the X10 MAG button light is on. No action
occurs in X-Y mode.
A X10 symbol appears in the readout on the right
side of the A SEC/DIV display in A and ALT Horizon-
tal MODE and on the left side of the B SEC/DIV
display in B Horizontal MODE when X10 MAG is on.
In X10 MAG mode, the fastest display sweep speed
is extended to 2ns per division. The crt SEC/DIV
readout reflects the correct display sweep speed for
the X10 MAG displays and the unmagnified displays.
MODE Buttons (Up-Arrow and Down-Arrow) and
Indicators— Select and indicate the operating mode
of the horizontal deflection system.
The Up/Down MODE buttons are used to select the
desired mode of operation; the Horizontal MODE
indicator lights show the selected horizontal
REV OCT 1986
Controls, Connectors, and Indicators--2246 Operators
deflection mode. {Not all Menu Measurement modes
are compatible with all horizontal deflection modes.
See Section 6 for Menu Measurement operation.)
A—Horizontal deflection occurs at a sweep
speed determined by the A SEC/DIV switch set-
ting displayed in the crt readout. The A/B
SELECT setting initializes to the A Trigger when-
ever the A MODE is selected.
ALT—Alternates between the A Sweep {with an
intensified zone) and the B Delayed Sweep. Both
the A and the B SEC/DIV switch settings are
displayed in the crt readout. The A/B SELECT
setting initializes to the B Trigger whenever ALT
MODE is selected.
The B SEC/DIV switch setting is selectable in
ALT Mode, but it cannot be set slower than the A
SEC/DIV switch setting. Attempting to do so will
switch both the A and the B SEC/DIV switch set-
tings to a slower sweep speed. A faster A
SEC/DIV setting must be set by the A and B
SEC/DIV switch in the A Horizontal MODE before
switching to ALT MODE. The B Sweep speed
and the length of the intensified zone are both
determined by the B SEC/DIV switch setting.
When the A SEC/DIV and the B SEC/DIV are
both set to the same sweep speed, an intensified
zone 1/100 of the A SEC/DIV setting appears on
the A Sweep and no alternate B Delayed Sweeps
are displayed. To display the B Delayed Sweep in
ALT Mode, set the B SEC/DIV setting to a faster
sweep speed that the A SEC/DIV setting.
B—Horizontal deflection occurs at a sweep speed
determined by the B SEC/DIV switch setting. The
A/B SELECT setting initializes to the B Trigger
whenever the B MODE is selected.
The start of the B Sweep in RUNS AFTER mode
(or the arming of the B Trigger in any triggered
mode) is delayed from start the of the A Sweep
by a time determined by the setting of the I+ or
DELAY control. The B SEC/DIV switch setting
and the Delay Time Position setting are displayed
in the crt readout. A question mark is displayed in
front of the Delay Time readout if the B Trigger
MODE is not RUNS AFTER. When a time CUR-
SOR measurement mode is selected (+ SEC -l,
l- 1/SEC I, or l-e PHASE I) is selected, the B
Trigger MODE switches to RUNS AFTER so that
timing measurements may be made.
X-Y— The signal applied to CH 1 ORX input
connector produces the horizontal (X-Axis)
deflection. Signals applied to any vertical input
3-5

Tektronix 2246 Specifications

General

Brand	Tektronix
Model	2246
Category	Test Equipment
Language	English