Operating Manual EMI TEST RECEIVER ESIB7 - Rohde & Schwarz

ESIB
Analyzer - Main Markers
CP/ACP
ABS REL
The CP/ACP ABS/REL softkey (Channel Power/Adjacent Channel Power
Absolute /Relative) switches between an absolute and relative display of the
power measured in the channel or adjacent channel.
Channel power measurement
CP ABS The absolute value of the power is displayed in the unit of the
Y axis, eg in dBm, dBV.
CP REL The power of a freely selected channel is measured. This
power is set in relation to the power of a reference channel.
The reference channel power is selected beforehand using
the SET CP REFERENCE softkey, ie:
1. Declare the power in the currently measured channel as
the reference value using the SET CP REFERENCE
softkey.
2. Set the channel of interest by changing the channel
frequency (ESIB center frequency).
In case of linear scale of the Y axis the relative power
(CP/CP ref ) of the new channel is displayed in addition to the
reference channel. In case of dB scale, the logarithmic ratio
20×log (CP/CP ref ) is displayed.
Therefore, the relative channel power measurement can also
be used for universal adjacent channel power measurements.
Example:
Measurement of the 1597-QCDMA adjacent channel power.
The useful channel and the adjacent channels have different
bandwidths (1.23 MHz or 30 kHz).
Adjacent channel power measurement
The power of the adjacent channels is measured. The
reference value is the power of the useful channels (see
measurement of the adjacent channel power). The useful
channel is marked by two vertical lines that are labelled with
C0.
ACP ABS The powers of the useful channel and of the adjacent
channels are displayed as absolute values in the unit of the Y
axis.
ACP REL The logarithmic ratio 20×log (CP/CP 0 ) of the powers of the
adjacent channels to the useful channel is displayed
The softkey is not available for OCCUPIED PWR BANDWIDTH, C/N and
C/N0
IEC/IEEE-bus command
:[SENSe:]POWer:ACHannel:MODE ABS|REL
SET CP
REFERENCE
The SET CP REFERENCE softkey sets the reference value to the currently
measured channel power for an activated CHANNEL POWER power
measurement,.
IEC/IEEE-bus command
:[SENSe:]POWer:ACHannel:REF:AUTO ONCE
1088.7531.12 4.189 E-15