Rohde & Schwarz R&S SMU200A, Руководство по обслуживанию

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R&S SMU200A Test Procedures
1007.9845.82 1.67
E-12
Function Level Attenuation
The equipment layout for generating GSM/EDGE signals includes the options R&S B13 (Baseband Main
Module), R&S B10 (Baseband Generator) and R&S K40 (Digital Standard GSM/EDGE).
Test equipment Signal analyzer (table 1-1, pos. 24) with options R&S FSQ-K70 (Vector
Signal Analysis) and FS-K5 (GSM/EDGE Measurements).
Test setup
Connect signal analyzer to RF output of DUT.
Measurement
Settings on DUT:
Frequency: 450 MHz
Level: 0 dBm
GSM/EDGE:
State ON
Define All Slot Attenuations
A1 0 dB
A2 10 dB
A3 20 dB
A4 30 dB
A5 40 dB
A6 50 dB
A7 60 dB
Slot 0
Slot Level Attenuated
Slot Attenuation 0 dB (A1)
Settings on analyzer
VSA
FREQ CENTER 450 MHz
DIGITAL STANDARD GSM/EDGE GSM NB
ADJUST REF LVL
Read off the level of the signal in the Modulation Accuracy table at
mean power and write it down as the reference level.
On the DUT, set the level attenuation of slot 0 in sequence to 10 dB
(A2) to 60 dB (A7) (see above).
Settings on analyzer (for each level attenuation settings)
ADJUST REF LVL
Each time, measure the level again relative to the reference level.
The additional level error in question is the difference of the level
difference measured to the level difference set.
Recommended test frequencies
450 MHz, 850 MHz, 1.8 GHz, 2.5 GHz, 3.0 GHz, 3.2 GHz, 4.5 GHz,
5.4 GHz.
The number of necessary measurement depends on the number of installed RF- and baseband paths, see
following table:
Installed paths 1 x RF
1 x BB 2 x RF
2 x BB 2 x RF
1 x BB 1 x RF
2 x BB
Custom Digital Mod: level attenuation
Number of measurements
1x 2x 2 x 2 x