CMU RF: Connection Control
1100.4903.12 4.67 E-10
Ext. Att.
Output
The softkey Ext. Att. Output defines an external attenuation (or gain, if the value is
negative) at the selected RF output.
Input of an external attenuation is suitable if, e.g., a path attenuation (cable) is in-
cluded in the test setup, which is to be compensated for by an increased signal
level.
If an external attenuation is defined, the output signal level is referenced to the
input of the DUT, the generator level is therefore shifted with respect to the actual
level at the input connector of the CMU. The default value for the generator power
and the level ranges for the RF outputs are also shifted provided that the generator
can output the required power, compensating for the external attenuation or gain.
Otherwise it is adapted to the level closest to the shifted default value.
Attenuator
x dB
(P
nom
+ x) dBm
P
nom
dBm
0
123
456
789
.
-
ON / OFF ENTER
1100.00 08.02
VARIATI ONDATA
FUNCTION SYSTEM
CONTROL
DATA
CTRL
MENU
SELECT
HELP SETUP
mark
symb
E
F
BM/µ
µV
W
C
dBµV
k/m
G/n
A
mV
D
1
dB
dBm
UNIT...
EXP/CMP CONT/HALT
RF4 IN
UNIVERSAL RAD IO COMMUNICATION TESTER CMU 200
.
ESCAPE
*
abc def ghi
jkl mno pqr
stu
vwx yz
_ µ
AF IN AF OUT
VOL
DEL
AUTO
INF O RESET
PRINT
*
#
Ω
AUX 1 AUX 2
SPEECH
AUX 3
DATA 2
13 dBm
MAX
2 W
MAX
50 W
MAX
13 dBm
MAX
RF 3 OUT
RF 2 RF 1
DATA 1
INS
CLR
CMU
RF level: P
nom
dBm
Ext. Att. Output: x dB
x
2
DEF
3
GHI
1
ABC
564
8
ÜVW
7
STU
.
-
0
9
XYZ
SCRC L M
Note: RF User Correction
In addition to the static external output attenuation setting, the CMU pro-
vides a systematic correction of the generated RF power by means of user-
defined, frequency and level-dependent correction tables; see section RF
User Correction in Chapter 1.
Remote control
[SENSe:]CORRection:LOSS:OUTPut<nr>[:TX][:MAGNitude] <Loss>
SOURce:CORRection:LOSS:OUTPut<nr>[:TX][:MAGNitude] <Loss>
[SENSe:]CORRection:LOSS:OUTPut<nr>:AUXTx[:MAGNitude] <Loss>
SOURce:CORRection:LOSS:OUTPut<nr>:AUXTx[:MAGNitude] <Loss>
RF
Input
The RF Input softkey determines which of the three connectors RF 1, RF 2 and
RF 4 IN is to be used as RF input connector. The selected RF output is indicated
by a
symbol. Input and output connectors can be arbitrarily combined.
Remote control
INPut[:STATe] RF1 | RF2 | RF4
Ext. Att.
Input
The softkey Ext. Att. Input enters the value of the external attenuation (or gain) at
the selected RF input.
Input of an external attenuation is required if, for example, external attenuator pads
are used for protection of the sensitive RF inputs of the CMU or if a path attenua-
tion is included in the test setup.
If an external input attenuation is reported to the instrument, all levels measured
are referenced to the output of the DUT and therefore shifted with respect to the
actual level at the input connectors of the CMU. The level ranges for the input con-
nectors are shifted as well.
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