R&S FSL Power Measurements – MEAS Key
1300.2519.12 4.97 E-11
If the spacings are not equal, the channel distribution according to the center frequency is as
f
ollows:
Odd number of TX channels The middle TX channel is centered to center frequency.
Even number of TX channels The two TX channels in the middle are used to calculate
the frequency between those two channels. This
frequency is aligned to the center frequency.
– Adjacent channels (right column)
Since all the adjacent channels often have the same distance to each other, the modification of
of the adjacent–channel spacing (ADJ) causes a change in all higher adjacent–channel
spacings (Alt1, Alt2, ...): they are all multiplied by the same factor (new spacing value / old
spacing value). Thus only one value needs to be entered in case of equal channel spacing. A
modification of a higher adjacent–channel spacing (Alt1, Alt2, ...) causes a change by the same
factor in all higher adjacent–channel spacings, while the lower adjacent–channel spacings
remain unchanged.
Example:
In the default setting, the adjacent channels have the following spacing: 20 kHz (ADJ), 40
kHz (Alt1), 60 kHz (Alt2), 80 kHz (Alt3), 100 kHz (Alt4), ...
If the spacing of the first adjacent channel (ADJ) is set to 40 kHz, the spacing of all other
adjacent channels is multiplied by factor 2 to result in 80 kHz (Alt1), 120 kHz (Alt2), 160 kHz
(Alt3), ...
If, starting from the default setting, the spacing of the 5th adjacent channel (Alt4) is set to 150
kHz, the spacing of all higher adjacent channels is multiplied by factor 1.5 to result in 180 kHz
(Alt5), 210 kHz (Alt6), 240 kHz (Alt7), ...
If a ACP or MC–ACP measurement is started, all settings according to the standard including
the channel bandwidths and channel spacings are set and can be adjusted afterwards.
Remote: POW:ACH:SPAC:CHAN 25kHz
Remote: POW:ACH:SPAC 33kHz
Remote: POW:ACH:SPAC:ALT1 100kHz
Chan Pwr/Hz
If deactivated, the channel power is displayed in dBm. If activated, the channel power density is
displayed instead. Thus, the absolute unit of the channel power is switched from dBm to
dBm/Hz. The channel power density in dBm/Hz corresponds to the power inside a bandwidth of
1 Hz and is calculated as follows:
channel power density = channel power – log
10
(channel bandwidth)
By means of this function it is possible e.g. to measure the signal/noise power density or use the
additional functions ACP Abs/Rel and ACP Ref Settings to obtain the signal to noise ratio.
This softkey is available from firmware version 1.50.
Remote: CALC:MARK:FUNC:POW:RES:PHZ ON
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