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Modulation Analysis
R&S
®
Cable Rider ZPH
276
User Manual 1321.0950.02 ─ 07
1 =
Title Bar
2 = AM or FM modulation
3 =
Upper Limit
4 =
Lower Limit
5 = "PASS" or "FAIL" result of the limit test
6 =
Analog Modulation Parameters
7 =
Demodulation Bandwidth
8 =
Audio lowpass filter
9 =
Measurement time
10 =
Configuration Overview
11 = Softkey menu of analog modulation measurement. See
Chapter 12.1.3.1, "Analog Modulation"
,
on page 280.
The following analog modulation parameters are calculated:
Table 12-1: Analog Modulation Parameters
Label
Description
Carrier Power
Shows the power of the carrier without modulation
in dBm.
Carrier Freq Offset
Shows the deviation of the calculated carrier fre-
quency to the ideal carrier frequency in Hz.
Mod Index (AM domain)
Shows the difference in amplitude the carrier sig-
nal is modulated with.
Freq Deviation (FM domain)
Shows the frequency deviation that the carrier
signal is modulated with.
Modulation Rate
Shows the modulation rate in %.
Modulation rate = (Frequency Deviation /
Refrence Deviation ) * 100 %
+Peak
-Peak
Shows the minimum and maximum frequency
deviation (FM signals) or modulation depth (AM
signals).
±
Peak/2
Shows the average frequency deviation (FM sig-
nals) or modulation depth (AM signals). (| +Peak |
+ | -Peak |) / 2
RMS
Shows the root mean square of the frequency
deviation (FM signals) or modulation depth (AM
signals).
Mod Freq
Shows the modulation frequency.
Analog Demodulation