R&S 1129.7246.03, Operating Manual, Page: 200 / 855

Operating Manual 1302.6163.12 - 03 4.169
R&S ESU Instrument Functions
Analyzer Mode
4.8.13 Power Measurements – MEAS Key
With its power measurement functions the R&S ESU is able to measure all the nec-
essary parameters with high accuracy in a wide dynamic range.
A modulated carrier is almost always used (except e.g. SSB-AM) for high-frequency
transmission of information. Due to the information modulated upon the carrier, the
latter covers a spectrum which is defined by the modulation, the transmission data
rate and the signal filtering. Within a transmission band each carrier is assigned a
channel taking into account these parameters. In order to ensure error-free trans-
mission, each transmitter must be conforming to the specified parameters. These
include among others:
• the output power,
• the occupied bandwidth, i.e. the bandwidth which must contain a defined
percentage of the power and
• the power dissipation allowed in the adjacent channels.
Additionally the menu contains functions to determine the modulation depth of AM
modulated signals and to measure the 3
rd order intercept point.
The measurements and the corresponding settings are selected in the MEAS menu.
MEAS
The MEAS key opens the menu to select and set the power measurement.
The following measurements can be selected:
• Power in the time domain ( “TIME DOM POWER” on page 4.170 )
• Channel power and adjacent-channel power in the frequency domain with a single
carrier ( “CHAN PWR ACP MULT CARR ACP” on page 4.178 )
• Occupied bandwidth ( “OCCUPIED BANDWIDTH” on page 4.197 )
• Carrier-to-noise ratio ( “C/N / C/NO” on page 4.209 )
• Amplitude probability distribution ( “SIGNAL STATISTIC” on page 4.202 )
• Modulation depth ( “MODULATION DEPTH” on page 4.210 )
TIME DOM POWER
!
CHAN PWR ACP MULT CARR
ACP
!
OCCUPIED BANDWIDTH
!
SIGNAL STATISTIC
!
C/N / C/NO
!
MODULATION DEPTH
SPECTRUM EMISSION MASK
SPURIOUS EMISSIONS
!
SELECT MARKER
Side menu
TOI
TOI MKR CALC SRCH
HARMONIC DISTOR
!