Making measurements from the trace
Virtual digital oscilloscopes, 60 MHz
VI - 33
Making measurements from the trace (continued)
2. Automatic
measurements
There are two types of automatic measurement:
a) general measurements on a channel
b) automatic phase measurement
a) General
measurements
on a channel
This function makes it possible to view the results of 19 automatic
measurements in a new window:
Vmin
Vmax
Vpp
Vlow
Vhigh
Vamp
Vrms
Vavg
Over+
Trise
Tfall
L+
L-
P
F
DC
N
Over-
Sum
minimum peak voltage
maximum peak voltage
peak to peak voltage
established low voltage
established high voltage
amplitude
operating voltage
average voltage
positive offset
ascending time
descending time
width of positive pulse (at 50% Vamp)
width of negative pulse (at 50% Vamp)
period
frequency
duty cycle ratio
number of pulses
negative offset
sum of elementary areas (= integral)
T = 1/F
W+
W-
Vmax
Vhigh
Vlow
Vamp Vpp
>5%T
Trise
Tfall
0%
10%
50%
90%
100%
>5%T
Vmin
t1
t4
t6
Vavg
•
Positive offset = [100 * (Vmax – Vhigh)] / Vamp
•
Negative offset = [100 * (Vmax – Vlow)] / Vamp
•
Vrms =
[
(y
y
) ]
1
n
i
i 0
i n
GND
2 1/2
=
=
∑
−
•
Vavg
=
1
n
(y
y
)
i
i 0
i n
GND
=
=
∑
−
Y
GND
= value of the point representing zero Volts
P
low
high
avg
L-
L+
tm
td
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