Rigol RSA5000 Series, User Manual

Page: 71 / 204

Chapter 2 Functions of the Front Panel of GPSA RIGOL
RSA5000 User's Guide 2-27
Detector Type
Sets the detector for the current measurement. The selected detector can be applied
to the selected trace. The available trace detectors include Pos Peak, Neg Peak,
Normal, Sample, Average (RMS), and Average (Vol).
1. Pos Peak
For each trace point, Positive Peak detector displays the maximum value of data
sampled within the corresponding time interval.
2. Neg Peak
For each trace point, Negative Peak detector displays the minimum value of data
sampled within the corresponding time interval.
3. Normal
Normal detector (also called Rosenfell detector) displays the maximum value
and the minimum value of the sample data segment in alternating sequence.
That is, for an odd-numbered data point, the minimum value of the sample data
is displayed; for an even-numbered data point, the maximum value of the
sample data is displayed. I n this way, the amplitude variation range of the signal
is clearly shown.
4. 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.
5. Average ( RMS)
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.
I n this type, noise can be rejected and weak signals can be clearly observed.
∑
=
× =
N
i RMS
v
N
V
1 i
2
1
(2-8)
Wherein,
RMS
V
is the root mean square value of voltage, expressed in V;
N
is
the number of sampled values for each point displayed;
i
v
is the envelope of
the sampled value, expressed in V. Reference impedance
R
can be used to
calculate power based on the formula:
R
v
P
RMS
2
=
.
6. Average ( Vol)
For each data point, perform arithmetic averages (see equation below) on all the
sampled data within the corresponding time interval and display the result.
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