Kenwood CS-3025, Instruction Manual

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TIME MEASUREMENTS
T h i s is the procedure for making time measurements between t w o points on a w a v e f o r m .
The combination of the S W E E P T I M E / D I V and the horizontal distance in divisions between
the t w o points is used in the calculation.
Procedure:
1 . Apply the signal to be measured to the INPUT j a c k . S e t the V or Y M O D E to the c h a n -
nel to be used. Adjust the V O L T S / D I V and S W E E P T I M E / D I V for a normal display.
Be sure that the V A R I A B L E control is set to C A L .
2 . Using the f POSITION control, set one of the points to be used a s a reference to coin-
cide w i t h the horizontal centerline. Use the ^ • POSITION control to set this point at
the intersection of any vertical graduation line.
3 . Measure the horizontal distance between the t w o points.
Multiply this by the setting of the S W E E P T I M E / D I V control to obtain the time between
the t w o points. If horizontal " x 5 M A G " is u s e d , multiply this further by 1/5.
Using the formula:
Time = Horizontal distance (div) x ( S W E E P T I M E / D I V setting) x " x 5 M A G " value"
1
( 1 / 5 )
Fig. 1 2
Adjust to horizontal
center line with
* POSITION
[ E X A M P L E ]
For the example, the horizontal distance between the t w o points is 5 . 4 divisions.
If the S W E E P T I M E / D I V is 0 . 2 ms/div w e calculate. (See Fig. 12)
Substituting the given value:
Time = 5 . 4 (div) x 0 . 2 (ms/div) = 1.08 ms
FREQUENCY MEASUREMENTS
Frequency measurements are made by measuring the period of one c y c l e of w a v e f o r m
and taking the reciprocal of this time value a s the frequency.
Procedure:
1 . S e t the oscilloscope up to display one c y c l e of w a v e f o r m (one period).
2. T h e frequency is the reciprocal of the period measured.
1
Using the formula: Freq =
p e r
j
o c
j
24
Adjust to the vertical
scale with •< POSITION
Horizontal distance