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PEAKS Peaks
47
MKR 608 MHz
REF .
0
dBm
ATTEN
10
dB
-42.23
dBm
PEAK
1
ne
1
LY”
2,
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MARKER
608
YHz
-42.23
dBm
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WF,
SB
SC FS
i
CORR’
:
;
:
;
:
;
: :
!
TH
-60
.0
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..t......................................................................
dBm
I
I
CENTER 300 MHz
SPAN 1.500
8Hz
tRES
BW 30
kHz
UBW
30
kHz
SWP 5.00
set
R
Figure 5-9. Frequency and Amplitude of the Peaks
If the FRQ parameter is used with the PEAKS command, the programming example returns the
values that shown in the following table.
Trace Element
TRB[
l]
TRB[2]
L
TRB[3]
TRB[4]
TRB[S]
If the AMP parameter is used with the PEAKS command, the programming example returns
the values that are shown in the following table.
Trace Element Amplitude
Frequency
TRB[l] -13.95
4.E+6
TRB[S]
-28.14 3.04E+8
TRB[J]
-28.89
-2.963+8
TRB[4]
-32.6
9.07E
+
8
TRB[B]
-42.23 6.08+8
Notice that MKA? and MKF? are used to determine the amplitude and frequency of the peak
position.
PEAKS sorts only signals that are above the threshold value. To be classified as a signal peak,
a signal must be MKPX above the threshold value and it must rise and fall at least the peak
excursion (MKPX value). To change the threshold, use the TH command before PEAKS is
executed.
If necessary, the last sorted value is repeated to fill remaining elements of the destination trace.
PEAKS must be used as either a query or as a source in another spectrum analyzer-command
function. Form a query by ending the PEAKS statement with a
“?.”
When used as a query,
PEAKS returns the number of peaks found. When querying the trace elements of destination
trace, the x-axis coordinate (relative to the first trace element) of the peak is returned.
5-426 Programming Commands