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2. Set the T R I G MODE to A U T O and A C - G N D - D C to the GND position, w h i c h established
the zero volt reference. Using the f POSITION control, adjust the trace position to the
desired reference level position, making sure not to disturb this setting once made.
3 . Set the A C - G N D - D C s w i t c h to the D C position to observe the input w a v e f o r m , includ-
ing its DC component. If an appropriate reference level or V O L T S / D I V setting w a s not
made, the waveform may not be visible on the C R T screen at this point. If s o , reset
V O L T S / D I V and/or the $ POSITION control.
4 . Use the -< • POSITION control to bring the portion of the waveform to be measured
to the center vertical graduation line of the C R T screen.
5. Measure the vertical distance from the reference level to the point to be measured,
(the reference level can be rechecked by setting the A C - G N D - D C s w i t c h again to GND).
Multiply the distance measured above by the V O L T S / D I V setting and the probe attenu-
ation ratio as well. Voltages above and below the reference level are positive and nega-
tive values respectively.
Using the formula:
DC level = Vertical distance in d i v i s i o n s x ( V O L T S / D I V setting) x (probe attenuation ratio).
[ E X A M P L E ]
For the example, the point being measured is 3.8 divisions from the reference level (ground
potential).
If the V O L T S / D I V w a s set to 0 . 2 V/div and a 10:1 probe w a s used. (See Fig. 9)
Substituting the given values:
DC level = 3.8 (div) x 0 . 2 ( V / d i v ) x 10 = 7.6 V
Measuring point adjusted to the center
vertical scale by M •
POSITION
Ground potential adjusted by
£ POSITION (reference line)
Fig. 9
21
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