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Chapter 6 Operations and Measurements RIGOL
DS8000-R User Guide 6-31
10. Vavg: indicates the arithmetic average value on the whole waveform or in the
gating area. The formula is shown as follows:
n
x
Average
n
i
i
∑
1=
=
Wherein,
i
x
is the measurement result of the
i
th point, and
n
is the number
of points being measured.
11. VRMS: indicates the root mean square value on the whole waveform or in the
gating area. The formula is as follows:
n
x
RMS
n
i
i
∑
1
2
=
=
Wherein,
i
x
is the measurement result of the
i
th point, and
n
is the number
of points being measured.
12. Per.VRMS: indicates the root mean square value within a period. The formula is
as shown above.
13. Overshoot: indicates the ratio of the difference between the maximum value
and the top value of the waveform to the amplitude value.
14. Preshoot: indicates the ratio of the difference between the minimum value and
the base value of the waveform to the amplitude value.
15. Std. Dev: indicates the root-mean-square value of the waveforms, with the DC
component removed. The formula is shown as follows:
n
Averagex
DevS
n
i
i
∑
1
2
)(
.td
=
−
=
Wherein,
i
x
is the amplitude of the
i
th point,
Average
is the waveform average
value, and
n
is the number of the points being measured.
Other Parameters
1
． Positive Slew Rate: On the rising edge, first calculate the difference between
the high value and the low value, then use the difference to divide the
corresponding time value to obtain the positive slew rate.
2
． Negative Slew Rate: On the falling edge, first calculate the difference
between the low value and the high value, then use the difference to divide the
corresponding time value to obtain the negative slew rate.
3
． Area: indicates the area of the whole waveform within the screen. The unit is
V*s. The area of the waveform above the zero reference (namely the vertical
offset) is positive, and the area of the waveform below the zero reference is
negative. The area measured is the algebraic sum of the area of the whole
waveform within the screen.
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