Controls, Connectors, and
lndicators-2230
Operators
@
If properly coded probes
(1
X,
1
OX,
or
1
OOX,
see
Table 3-1) are connected to a channel input connec-
tor, the crt VOL TS/DIV readout will reflect the
correct deflection factor of the display.
Probe
1X
10X
100X
IDENTIFY
Table
3-1
Probe Coding
Coding Resistance
Infinite
11
kn ± 10%
5.6
kn
-10%
to 6.2 kn
+10%
O n or none of the above
Variable
VOL
TS/DIV Controls-Provide continu-
ously variable uncalibrated deflection factors
between the calibrated positions of the VOL TS/DIV
controls. The VOL TS/DIV sensitivity is reduced
by
up to at least 2.5 times the sensitivity at the fully
counterclockwise position of the variable knob. A
detent
at
the fully clockwise position indicates the
calibrated VOL TS/DIV position
of
the variable knob.
The uncalibrated condition is indicated by a greater-
than symbol
(>)
in
front of the affected VOL TS/DIV
readout.
@ AC-GND-DC (Input Coupling)
Switches-Select
the
method of coupling the input signal to the
CH
1 and
CH
2 vertical amplifiers and the storage acquisition
system.
3-4
AC-Capacitively
couples the input signal to the
vertical deflection and signal acquisition systems.
The
DC
component of the input signal
is
blocked.
The lower
-3
dB bandpass is 10 Hz or less.
Selection
of
AC input coupling
is
indicated
in
the
readout
by
a tilde symbol
(N
) over the V on the
associated channel's VOL TS/DIV readout.
GND-Grounds the input of the vertical amplifier;
provides a zero (ground) reference voltage display
(does not ground the input signal).
In
STORE
mode, the ground reference is acquired and
displayed
in
the first sample location of the
acquisition waveform display. When
GND
input
coupling
is
selected, a ground symbol
is
displayed
in
the associated VOL TS/DIV readout.
DC-All
frequency components of the input signal
are coupled to the vertical deflection and signal
acquisition systems. When
DC
input coupling
is
selected, no additional indicators are displayed
with the associated VOL TS/DIV readout.
@
CH
1
OR
X and
CH
2
OR
Y Input
Connectors-
Provide for application of signals to the inputs of the
vertical deflection system and the storage acquisition
system.
Coding-ring contacts
on
each
of
the input connec-
tors are used to automatically switch the scale factor
displayed by the crt readout when a properly coded
probe is attached to the input connector. Displayed
STORE mode waveforms are reformatted to main-
tain the correct deflection
as
indicated
by
the
VOL TS/DIV readout on the affected channel(s).
In
X-
Y mode, the signal connected to the
CH
1
OR
X
input controls the horizontal deflection, and the sig-
nal connected to the
CH
2
OR
Y input controls the
vertical deflection.
CH
2 INVERT Switch-Inverts the Channel 2 display
and STORE mode Channel 2 acquisition signal when
pressed
in.
An
invert symbol (l)
is
displayed with the
CH
2 VOL TS/DIV readout when
CH
2
is
inverted.
With
CH
2 inverted, the oscilloscope may be
operated
as
a differential amplifier when the Vertical
MODE of BOTH-ADD is selected.
® VERTICAL MODE
Switches-Select
the mode
of
operation for the vertical amplifier. There are
two
three-position switches and one two-position switch
that determine display and acquisition modes and
one two-position push-button switch that controls
the nonstore bandwidth.
CH
1-Selects
only the Channel 1 input signal for
acquisition
or
display.
BOTH-Selects
a combination of Channel 1 and
Channel 2 input signals for acquisition or display.
The
CH
1-BOTH-CH 2 switch must
be
in
the
BOTH position for ADD, ALT, and CHOP opera-
tion.
CH
2-Selects
only the Channel 2 input signal for
acquisition or display.
ADD-Displays
(NON STORE) or acquires and
then displays (STORE) the sum of the Channel 1
and Channel 2 input signals when BOTH
is
also
selected. The difference
of
the Channel 1 and
Channel 2 input signals
is
displayed (NON
STORE) or acquired and then displayed (STORE)
when the Channel 2 signal
is
inverted.
ALT
-Alternately
displays the nonstore Channel
1 and Channel 2 input signals. The nonstore alter-
nation occurs during retrace at the end of each
sweep. ALT Vertical MODE
is
most useful for
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