Hitachi V-209 Operation Manual page 15

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CH2 INPUT connector
Thr same as CHI, but when the instrument is used as an
X- Y oscilloscope, the signal input to this terminal
becomes the Y -axis signal.
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Input coupling switches
Used to select the coupling system between the input
signal and vertical axis amplifier.
At this setting. the signal is connected through a
AC
condenser. The
signal is cut off and only the AC component is dis·
played.
GND At this setting, the input to the vertical axis ampli­
fier is grounded.
DC At this setting, the input signal is directly con­
nected to the vertical axis amplifier and displayed
unchanged, including the DC component.
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VOLTS/DIV select switches
A step attenuator which selects vertical deflection fac­
tor. Set it to an easily observable range corresponding to
the amplitude of the input signal.
Multiply the reading by I 0 when the I 0: I probe is used
in combination with the instrument.
(AC-GND- DC)
DC component of the input
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VARIABLE controls
Fine tuning device is used to vary the vertical deflection
sensitivity continuously. Attenuation of less than 1/2.5
is obtained when this device is rotated in the reverse
direction of the arrow to the full.
This control is used when comparing wavefom1s or when
measuring the rise tinle of a square wave in 2-channel
observation. Normally this control is left rotated in the
direction of the arrow to the full.
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POSITION controls
Used to adjust the position of the vertical axis.
The image rises with the clockwise rotation of this knob
and falls with the counterclockwise rotation. When the
knob is at PULL position, (pulled up state) the gain of
the vertical axis is magnified 5 times and the maximum
sensitivity becomes I mY /DIY.
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select switch
MODE
Used to select the operation mode of the vertical deflec­
tion system.
CH J Only the signal that has been applied to CHI
appears on the screen.
CH2 Only the signal that has been applied to CH2 ap­
pears on the screen.
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