Rohde & Schwarz EMI Test ReceiverESCI - Page 293

R&S ESCI Analyzer - MEAS
1166.6004.12 4.161 E-1
Note:
The softkey is only available for the multicarrier ACP
measurement.
IEC/IEEE-bus command:
SENS:POW:ACH:REF:TXCH:MAN 1
SENS:POW:ACH:REF:TXCH:AUTO MIN
CP/ACP
ABS REL
The CP/ACP ABS/REL softkey (channel power
absolute/relative) switches between absolute and relative power
measurement in the channel.
CP/ACP ABS The absolute power in the transmission channel
and in the adjacent channels is displayed in the
unit of the Y axis, e.g. in dBm, dBµV.
CP/ACP REL For adjacent-channel power measurements (NO.
OF ADJ CHAN > 0), the level of the adjacent
channels is displayed relative to the level of the
transmission channel in dBc.
For channel power measurements (NO. OF ADJ
CHAN = 0) with a single carrier, the power of the
transmission channel is displayed relative to the
power of a reference channel defined by SET CP
REFERENCE. This means:
1. Declare the power of the currently measured
channel as the reference value, using the
SET CP REFERENCE softkey.
2. Select the channel of interest by varying the
channel frequency (R&S ESCI center
frequency).
With linear scaling of the Y axis, the power of the
new channel relative to the reference channel
(CP/CP
re
f
) is displayed. With dB scaling, the
logarithmic ratio 10lg (CP/CP
ref
) is displayed.
The relative channel power measurement can
thus also be used for universal adjacent-channel
power measurements. Each channel can be
measured individually.
IEC/IEEE-bus command: SENS:POW:ACH:MODE ABS
CHAN PWR
/ HZ
The CHAN PWR / HZ softkey toggles between the
measurement of the total channel power and the measurement
of the channel power referenced to a 1-Hz bandwidth.
The conversion factor is
10 lg
1
Channel Bandwidth
⋅
⋅
.
By means of this function it is possible e.g. to measure the
signal/noise power density or use the additional functions
CP/ACP REL and SET CP REFERENCE to obtain the signal to
noise ratio.
IEC/IEEE-bus command:
CALC:MARK:FUNC:POW:RES:PHZ ON|OFF