User manual

Chapter 2 Front Panel Operation RIGOL
User’s Guide for DSA700 Series
2-23
 Pos Peak
For each trace point, Positive Peak detector displays the maximum value of
data sampled within the corresponding time interval.
 Neg Peak
For each trace point, Negative Peak detector displays the minimum value of
data sampled within the corresponding time interval.
 Sample
For each trace point, Sample detector displays the transient level
corresponding to the central time point of the corresponding time interval.
This detector type is applicable to noise or noise-like signal.
 Normal
Normal detector (also called rosenfell detector) displays the maximum value and
the minimum value of the sample data segment in turn; namely for an
odd-numbered data point, the maximum value is displayed; for an
even-numbered data point, the minimum value is displayed. In this way, the
amplitude variation range of the signal is clearly shown.
 RMS Avg
For each data point, perform mean square root operation (see equation (2-8))
of the sampled data within the corresponding time interval and display the
result. In this type, noise can be rejected and weak signals can be clearly
observed.
∑
=
×=
N
iRMS
v
N
V
1i
2
1
(2-8)
Wherein,
RMS
V
is the mean square root of voltage in V;
N
is the number of
sampled values for each point displayed;
i
v
is the envelop of the sampled
value in V. The reference impedance
R
can be used for power calculation: