Time Measurements; Frequency Measurements - Kenwood CS-3025 Instruction Manual

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 jack. S e t the V or Y MODE to the chan-
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 as 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 used, 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"
[ 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 cycle of w a v e f o r m
and taking the reciprocal of this time value a s the frequency.
Procedure:
1. Set the oscilloscope up to display one cycle of w a v e f o r m (one period).
2. T h e frequency is the reciprocal of the period measured.
Using the formula:
24
Adjust to the vertical
scale with •< POSITION
Horizontal distance
1
Freq = j j
p e r o c
Fig. 1 2
Adjust to horizontal
center line with
* POSITION
1 (1/5)