Hitachi V-209, Operation Manual

Page: 26 / 47

8. MEASURING PROCEDURE
The first things to do are as follows.
o Bring the brightness and FOCUS at optimum positions
for easy read out.
Display the waveform as large as possible to minimiLe
the read error.
Check the capacity correction when using a probe.
(Refer to paragraph (I) "When using a probe" of Sec­
tion 7. "Method for connecting signals" for correcting
capacity.)
(I) DC
voltage measurement
Set input coupling to G D and decide the zero level prop­
erly.
Set VOL TS/DIV appropriately and set AC-G D-DC to
DC. Since the bright 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/DIY is 50 mV/DIV, then
SO m
V / D IV
x
4.2
=
210mV (However, if the probe AT-
10 AK I .S (10:1) is in use, the true value of the signal be­
comes 10 times of the value, or SO mV/DIV
x
4.2
x
10
=
2.1V.)
DC
voltage (after shifting)
Zero level (reference line)
(2}
AC voltage measurement
The same as paragraph
8
(1).
"DC voltage measurement",
but here there is no need of align the zero level with the
scale line. Set the zero level to the position that can be
easily observed.
In the drawing as follows, VOLTS/DIV is IV/DIY, IV/
DIY
x
S
=
S Vp-p (SOVp-p at time using the probe AT-
10 AK 1.5(10: 1)). When magnifying and observing a small­
amplitude signal, superimposing on a high DV voltage,
set the input coupling to AC. The DC voltage is cut off and
AC voltage can be observed by increasing sensitivity.