OS-10V 02/04/2001 Rev.2
10
4.3 TIME MEASUREMENTS
4.3.1 TIME SPACE MEASUREMENTS
This is a procedure for making time (period) measurements between two points on a
waveform:
(1)
Connect the signal to be measured to the input terminal [18].
(2)
Adjust level to obtain steady waveform.
(3)
Turn VAR clockwise to the calibration position, and set sweep controls to obtain a
normal display of 1-2 signal cycles.
(4)
Using the vertical and horizontal positions, set two points to be measured in the
waveform on the same horizontal level.
(5)
Measure the distance between the two points , the measurement is calculated by the
following equation:
Distance between 2 points (DIV)
×
rate of sweep (t/Div)
TIME (S) = --------------------------------------------------------------------
Horizontal factor
Shown in figure 4-6, distance between A & B is 8 Div. sensitivity is 2
µ
S/Div, Horizontal
factor x 1, then Time measurement is 16
µ
S
Fig 4-6
4.3.2
CYCLE & FREQUENCY MEASUREMENTS
Shown in Fig 4-6, frequency measurements are made by measuring the time period of
one cycle of waveform (T), and calculating the frequency that equals the reciprocal of
the time period. For example, T=16
µ
S, then frequency is:
1
F =1/T = ------------------ = 62.5 KHz
16
×
10
-6
4.3.3 PULSE RISE TIME AND FALL TIME MEASUREMENTS
A
B
