Tektronix 2247A

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Controls, Connectors, and Indicators
CH 1 AND CH 2 VOLTS/DIV VAR Controls—Allows the CH 1 and
CH 2 vertical deflection factors to be Increased up to at least 2.5
times.
Vertical deflection factors are greater than the VOLTS/DIV switch
setting when the UNCAL indicator is lit and a greater-than symbol (>)
is displayed to the left of the associated VOLTS/DIV readout.
NOTE
Normally the VOLTS/DIV settings are calibrated when the
VAR control is in the fully clockwise (detent) position. How-
ever, if a front-panel setup had been recalled from the
Store/Recall Setup memory, it is possible for the
VOLTS/DIV settings to be calibrated or uncalibrated with
the VOLTIDIV VAR control in any position. When the con-
trols are rotated, normal variable operation returns.
UNCAL
Indicator—Lights
when
either
CH
1
or
CH
2
VOLTS/DIV
set-
tings
are
uncalibrated
(variable
function
in
effect).
SCOPE BW Button—Reduces the bandwidth of the vertical deflec-
tion system and trigger system to 20 MHz when the button Is lit. The
full bandwidth is available when the SCOPE BW button is not lit.
CH
2
INVERT
Button—Inverts
the
Channel
2
input
signal
when
the
INVERT
button
Is
lit.
The
Channel
2
Input
signal
In
ADD
mode
and
the
Channel
2
trigger
signal
pickoff
are
also
inverted.
A
down-arrow
symbol
Is
displayed
between
the
Channel
1
and
Channel
2
VOLTS/DIV
readout
when
the
INVERT
mode
Is
on.
COUPLING
Buttons—Select
the
method
of
coupling
Input
signals
to
the
Channel
1
and
Channel
2
attenuators.
GND-—Disconnects
the
input
signal
and
grounds
the
Input
of
the
associated
vertical
attenuator
to
provide
a
zero
(ground)
reference
voltage
display.
The
COUPLING
switch
Is
In
the
ground
position
when
the
AC
and
the
DC
buttons
are
not
lit.
A
ground
symbol
(7
)
is
displayed
to
the
right
2247A Operators 2-5