Horizontal - Tektronix 2235A Instruction Manual

Operating Instructions- 2235A Instruction
GND-The input of the vertical amplifier is
grounded to provide a zero (ground) reference-
voltage display (does not ground the input sig-
nal). This switch position allows precharging the
input coupling capacitor.
DC-All frequency components of the input
signal are coupled to the vertical deflection
systems.
@
CH 1 OR X and CH 2 OR Y Input Connec-
tors- Provide for application of external signals to
the instrument deflection system or for an X-Y dis-
play. In the X-Y mode (SECIDIV switch set to X-Y),
the signal connected to the CH 1 OR X input con-
nector provides horizontal deflection (X-axis), and
the signal connected to the CH 2 OR Y input con-
nector provides vertical deflection (Y-axis).
@
Vertical MODE Switches-Two three-position
switches and two button switches are used to select
the mode of operation for the vertical amplifier
system.
CH
1
-Selects only the Channel 1 input signal
for display.
BOTH
-
Selects both Channel 1 and Channel 2
input signals for display. The CH 1 -BOTH-CH 2
switch must be in the BOTH position for either
ADD, ALT, or CHOP operation.
CH 2 -Selects only the Channel 2 input signal
for display.
ADD
-
Displays the algebraic sum of the Chan-
nel 1 and Channel 2 input signals.
ALT- Alternately displays Channel 1 and Chan-
nel 2 input signals. The alternation occurs
during retrace at the end of each weep. This
mode is useful for viewing both input signals at
sweep speeds from 0.05 us per division to
0.2 ms per division.
CHOP-The display switches between the
Channel 1 ana Channel 2 input signals during
the sweep. The switching rate is about 500 kHz.
This mode is useful for viewing both Channel 1
and Channel 2 input signals at sweep speeds
from 0.5 ms per division to 0.5 s per division.
BW LIMIT-Limits the bandwidth of the vertical
deflection system and the A Trigger system to
about 20 MHz when the button is pressed in.
Button must be pressed in a second time to
release it and regain full 100-MHz bandwidth
operation. Provides a method for reducing inter-
ference from high-frequency signals when
viewing low-frequency signals.
TRlG VIEW-Press and hold the button in to
display a sample of the signal present in the A
Trigger amplifier (for all A & B SOURCE switch
settings). All other signals displays are removed
while the TRIG VIEW button is held in.
@INVERT Switch-Inverts the Channel 2 display
when button is pressed in. Button must be pressed
in a second time to release it and regain a non-
inverted display.
CAL
n
Connector
-
Provides an 0.5 V , negative-
going square-wave voltage at 1 kHz for compen-
sating voltage probes and checking the operation of
the oscilloscope's vertical system. It is not intended
to verify the accuracy of the vertical and the hori-
zontal deflection systems
@
GND Connector-Provides direct connection to
the instrument chassis ground.
HORIZONTAL
Refer to Figure 2-5 for location of items 19 through 25.
@ A and
B
SECIDIV Switches-Used to select the
sweep speeds for the A and B Sweep generators in a
1-2-5 sequence. To obtain calibrated sweep
speeds, the A and B SECIDIV Variable control must
be in the calibrated detent (fully clockwise).
A SECIDIV-The calibrated sweep seed is
shown between the two the two black lines on
the clear plastic skirt. This switch also selects
the delay time for delayed-sweep operation
when used in conjunction with the B DELAY
TIME POSITION control.
B SECIDIV-The B Sweep is set by pulling out
the DLY'D SWEEP KNOB and rotating it clock-
wise to a setting opposite the white line scribed
on the knob. The B Sweep circuit is used onlyfor
delayed-sweep operation.
Scans by
ARTEK MEDL4
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