Technical data

Chapter 1 15
What is the Sequence Analyzer?
Example Sequence: Equally Spaced Analysis Intervals
What is the Sequence Analyzer?
Example Sequence: Equally Spaced Analysis Intervals
To help further clarify the concepts of sequences, acquisitions and analysis intervals, an example of a
calibration sequence is shown in Figure 1-5. A spreadsheet is used to set up the sequence, acquisition and
analysis interval parameters and subsequently generate a tab separated file which is loaded into the list
sequencers. The use of the spreadsheet is defined in Chapter 7 but in this chapter it is used to help
explain the Sequence Analyzer concepts. The spreadsheet associated with this example is shown in
Figure 1-6.
In the diagram in Figure 1-5, a sample sequence of data is shown that could be used for calibrating a
mobile device. The data consists of a PGSM signal on Channel 1, which is stepped in down in power
(from -5 dBm to -47 dBm) over 15 steps. The radio standard is then changed to EGSM on Channel 1, and
the power is stepped down over another 15 steps. The radio standard is then changed back to PGSM, but
on Channel 2, and the power is stepped down again. Finally, the radio standard is changed to EGSM on
Channel 2, and the power is stepped down again.
Figure 1-5 Sequence with Equally Spaced Analysis Intervals
The analyzer sequence which prepares the test set to receive this set of data must be divided into four
acquisitions (one for each of the four radio standard/channel combinations). Each of the four
acquisitions, in turn, must be divided into 15 analysis intervals (one for each of the 15 power levels at
which measurements will be made).
A spreadsheet defining this example sequence is illustrated in Figure 1-6. on page 16.