2 . S e t 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 . S e t 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 w a v e f o r m 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 w a v e f o r m to be measured
to the center vertical graduation line of the C R T s c r e e n .
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 G N D ) .
Multiply the distance measured above by the V O L T S / D I V setting and the probe attenu-
ation ratio as w e l l . Voltages above and below the reference level are positive and nega-
tive values respectively.
Using the formula:
D C 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).
Measuring point adjusted to the center
vertical scale by
M
• POSITION
Ground potential adjusted by
£ POSITION (reference line)
[ 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 1 0 : 1 probe w a s used. ( S e e Fig. 9)
Substituting the given v a l u e s :
DC level = 3.8 (div) x 0 . 2 ( V / d i v ) x 10 = 7.6 V
21
Fig. 9
Vertica
l distanc
e
Summary of Contents for CS-3025
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