R&S 1129.7246.03, Operating Manual

Page: 221 / 855

R&S ESU Instrument Functions
Analyzer Mode
4.190 Operating Manual 1302.6163.12 - 03
CP/ACP
ABS | REL
The CP/ACP ABS/REL softkey (channel power absolute/relative) switches between
absolute and relative power measurement in the channel.
Remote command:
SENS:POW:ACH:MODE ABS
CHAN PWR / HZ The CHAN PWR / HZ softkey toggles between the measurement of the total chan-
nel power and the measurement of the channel power referenced to a 1-Hz band-
width.
The conversion factor is
By means of this function it is possible e.g. to measure the signal/noise power den-
sity or use the additional functions
CP/ACP REL and SET CP REFERENCE to
obtain the signal to noise ratio.
Remote command:
CALC:MARK:FUNC:POW:RES:PHZ ON|OFF
POWER MODE The POWER MODE softkey opens the submenu for selecting the power mode.
CLEAR/WRITE In the CLEAR/WRITE mode the channel power and the adjacent channel powers
are calculated directly from the current trace (default mode).
MAX HOLD In MAX HOLD mode the power values are still derived from the current trace, but
they are compared with the previous power value using a maximum algorithm. The
higher value is remained.
MAX HOLD mode is only applicable if the number of adjacend channels is > 0
Remote command:
CALC:MARK:FUNC:POW:MODE WRIT|MAXH
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, dBmV.
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 ESU center frequency).
With linear scaling of the y-axis, the power of the new channel rela-
tive to the reference channel (CP/CP
ref
) is displayed. With dB scal-
ing, 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.
10 lg
1
Channel Bandwidth
-----------------------------------------------
⋅
CLEAR/WRITE
MAX HOLD