Hitachi V-355 Operation Manual page 18

If the instrume nt is not used with the power supply turned
on rotate the INTENsity counterclockwise to reduce the
brightness and also blur the FOCUS.
NOTE
For usual observation, leave the following non-calibrating
function section set to "CAL" position.
VA RIABLE Rotate in the direction of arrow.
In this case the VOLTS/DIV is calibrated to
its indicating value .
SWP VAR Leave the knob in depressed state .
In this case the TIME/DIV is calibrated to
its indicating value .
Align the base line with the horizontal scale line at the
center of the screen by operating CHI POSITION. In some
cases the base line may be oblique to the scale slightly by the
effect of earth magnetism .
until it lie s on the horizontal scale line at the ce nter of the
screen by properly adjusting the semi-fixed variable resistor
TRACE ROTATION on the front panel.
In
this case , bring the base line
GENERAL MEASUREMENT
(1) In the case of observing a single waveform.
Use CHI or CH2 when not observing the phase differe nce
between two waveforms or when engaging in a operation
other than X-Y operation. Make the following settings
when using CH I .
QY
MODE select switch
@
Trigg er MOD E switc h
@
Trigger SOURCE
@
INT TRIG
Under these settings almost all the repetitive signals of
about 25 Hz or more applied to CH I can be synchro­
nized and observed by adjusting trigger LEVEL. Since the
MODE of horizon tal axis is at AUTO position , the base line
appears even when no signal is present or when input
coupling switch is at GND position. This means that the DC
voltage can be me asured. The following switching is needed
when observing low fre quency signals of about 25 Hz or less.
@
Trigger MODE
Synchronization can be effected by ope rating LEVER knob
under this setting.
CH I
AUTO
INT
CH I
NORM
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