Tektronix RSA2200A, Руководство пользователя

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Tutorial
2- 60
RSA2203A & RSA2208A User Manual
One frame consists of 1024 data points and one block consists of several frames.
Data are acquired in block units in the Demod mode. The number of frames in
one block is referred to as block size. Frame and block size are shown in
Figure 2--53.
1024 data points
Frame 0
Frame 1
Frame 2
Frame 3
1 block (= N frames)
...
Frame N--1
Figure 2- 53: Frame and block
Suppose that one block contains N frames. The acquisition length for a block is
calculated using this equation:
(One block acquisition length) = N
×
(One frame acquisition length)
One block acquisition length is set using
Acquisition Length
in the Timing
menu. One frame acquisition length is set internally, depending on span, and
displayed in Spectrum Length in the Timing menu.
To set the acquisition length, perform the following steps:
1. Press the TIMING key on the front panel.
By default, Acquisition Length is set to 64 ms and Spectrum Length 32 ms.
The number of frames in a block is 64
÷
32 = 2.
2. Press the Acquisition Length side key to change the value.
For example, set 256 ms by turning the knob (see Figure 2--54).
Setting the Acquisition
Length