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7. MEASURING PROCEDURE
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 error.
o Check the capacity correction when using a probe.
(Refer to Paragraph (1) "When using a probe" of Sec
tion 6. "Method for connecting signals" for the method
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
50 mV/div x4.2 = 210 mV (However, if the probe AT-
10 AJ 1.5 is in use, the true value of the signal becomes
10 times the value, or 50 mV/div x 4.2 x 10 = 2.1V.)
DC voltage (after shifting)
i
-
1
1
>
•o
(N
1
1
—
1
1
!
-■
--
--r
-
-
-
sPs
\
Zero level (reference line)
(2)
AC voltage measurement
The same as paragraph 7 (1), "DC voltage measurement",
but here those is no need of matching the zero level with
the scale line. Move the zero level at will to a position easy
to observe.
In the drawing as follows, VOLTS/DIV is IV/DIV, IV/
div X 5 = 5 Vp-p (50 Vp-p at time using the probe AT-
10 AJ 1.5). When magnifying and observing
a small-
amplitude signal, superimposing on a high DC voltage,
set input coupling to AC. The DC voltage is cut off and
AC voltage can be observed by increasing sensitivity.
20
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