Measuring Procedure - Hitachi V-355 Operation Manual

7.
The first things to do are as follows.
o
Bring the brightness and FOCUS at optimum positions
for easy read out.
o
Display the waveform as large as possible to minimize
the read e rror.
o
Check the capacity correction when using a probe.
(Refer to Paragraph ( I ) "When using a probe" of Sec­
tion 6. "Method for connecting signals" for the me thod
for correcting capacity.)
(1) DC voltage measurement
Set input coupling to GND and decide the zero level prop­
erly.
Set VOLTS/DIV appropriately and set AC -GND-DC to
DC. Since the base line shifts here by the amount of
DC voltage , the DC voltage of the signal can be obtained
by multiplying the shift width by the indicated value of
VOLTS/DIV. When VOLTS/DIV is 50 mV/DIV , then
2 1 0 mV (However, if the probe AT-
5 0 mV/div x4 .2
=
1 0 AJ 1 .5 is in use , the true value of the signal become s
1 0 times the value , or .50 mV/div x 4.2 x 1 0
(2) AC voltage measurement
The same as paragraph
but here those is no need of matching the zero level with
the scale line . Move the zero level at will to a p osition easy
to observe .
In the drawing as follows, VOLTS/DIV is I V/DIV, I V/
x
div 5
=
1 0 AK 1 .5). When magnifying and observing
amplitude signal, superimposing on a high DC voltage ,
set input coupling to AC . The DC voltage is cut off and
AC voltage can be observe d by increasing sensitivity.
2.I V.)
=
DC voltage (after shifting)
Zero level (reference line)
7
( I ), "DC voltage measurement",
5 Vp-p (50 Vp-p at time using the probe AT-
a small­
19