Rohde & Schwarz EMI Test ReceiverESCI - Power Measurements - Hardkey MEAS

R&S ESCI Analyzer - MEAS
1166.6004.12 4.145 E-1
Power Measurements – Hardkey MEAS
With its power measurement functions the R&S ESCI is able to measure all the necessary 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 transmission, 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 menu:
SIGNAL
STATISTIC
MEAS
TRIG
TIME DOM
POWER
OCCUPIED
BANDWIDTH
SWEEP
BW
CHAN PWR
ACP
MODULATION
DEPTH
TOI
SELECT
MARKER
C/N
C/No
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)
• Channel power and adjacent-channel power in the
frequency domain with a single carrier
(CHAN PWR ACP)
• Channel power and adjacent-channel power in the
frequency domain with several carriers
(MULT CARR ACP)
• Occupied bandwidth (OCCUPIED BANDWIDTH)
• Carrier-to-noise ratio (C/N, C/No)
• Amplitude probability distribution (SIGNAL STATISTICS)
• Modulation depth (MODULATION DEPTH)
• 3
rd
order intercept (TOI)
The above measurements are carried out alternatively.