R&S SM300
Measurement Uncertainty
Version 04
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Service Manual SM300: 1147.1652.00
Instrument Part No SM300: 1147.1498.03
2.3 Measurement Uncertainty
Perform a tolerance
analysis
Due to the specifications of the R&S SM300, the measuring equipment must
meet stringent requirements. Since the required measurement uncertainty of
the equipment depends on the test setup used, a tolerance analysis needs to
be performed.
Tolerances in the
test report
To be able to trace back errors in the measurement, the measurement
uncertainty should also be recorded in the test report.
The tolerances specified in the test report refer to the values specified in the
data sheet, i.e. the measurement uncertainties of the test setup used are to
be taken into account as well.
Unless otherwise specified, the specified tolerances indicated are always to
be observed.
Note
Please take into account the ETSI Technical Report ETR 028. The specified
tolerances refer to the R&S SM300 data sheet.
2.4 Manual Test Procedure
Measurement
performance
The suggested frequencies and levels at which the measurements should be
performed have been selected according to the instrument concept. Other
frequencies and levels can also be selected within the scope of values
mentioned in the data sheet.
Note
Before testing the rated specifications, allow the instrument to warm up for at
least 15 min. The ambient temperature should be 23° C to 26° C.
Before starting a
test
Before starting a test, use the Preset function of the R&S SM300 to place the
instrument in a defined condition.
Tested
specifications
Several specifications in the data sheet are not tested. Due to their digital
implementation, it is not necessary to test them directly. All these
specifications are indirectly taken into account with the following
measurements.
2.4.1 Self test
Self test before
testing performance
The R&S SM300 has a self test mode which checks that the instrument is
functioning properly and assists in troubleshooting. Before the performance
test is carried out, the self test should be called up and performed. If the self
test fails, the following tests are for failure analysis only.
