Measurement techniques. What Measurement Techniques Should Be Used? – A number of measurement techniques have been identified and can be found in: • FCC Rules – Radio Service Rules – Part 2 General Rules & Regulations – Industry Standards Incorporated by Reference • Text of the Report and Order • Public Notice Issued by the Commission • Knowledge Database • Industry Standards – Measurement Procedures Website • xxxx://xxx.xxx.xxx/oet/ea/eameasurements.htm – OET Website for Equipment Authorization General Information: xxxx://xxx.xxx.xxx/oet/ea/Welcome.html March 25-26, 2010 MRA International Workshop 2010 Tokyo, Japan 16 Equipment Authorization Program Certification (Approved by FCC or TCB) DoC (Self-approval using an accredited lab) Certification (Approved by FCC or TCB) DoC (Self-approval using an accredited lab) The type of approval is specified in the rules for the particular type of device Maximum Verification (Self-approval) SDoC (Part 68) (Self-approval Database by ACTA) Verification (Self-approval) SDoC (Part 68) (Self-approval Database by ACTA) Minimum March 25-26, 2010 MRA International Workshop 2010 Tokyo, Japan 17 FCC Authorization Requirements Verification SDoC DoC Certification Most ISM Equipment Cable System Term. Device TV & FM Receivers PC’s & Peripherals PC’s & Peripherals1 All Other Digital Devices Most Receivers Most Receivers Pt-to-Pt Microwave TV Interface Devices TV Interface Devices Broadcast Transmitters Consumer ISM Equipment Consumer ISM Equipment Aux. Broadcast Transmitters Telephone Equipment Telephone Equipment1 INMARSAT Equipment Most transmitters 406 MHz ELT Scanning Receivers CATV Relay Transmitters
Measurement techniques. The described measurement techniques include sensor selection and application practices, calibration and uncertainty analysis procedures. Especially for the load measurements on the wind turbine, although IEC/TS 61400-13 is not restrictive, strain gauge bridges applied on the structure are recommended. Their output is recommended to be related directly to an applied load level, wherever feasible. According to IEC/TS 61400-13 the data acquisition is to be performed for the collection of both time series and statistical data. The length of the time series is connected to the measured load cases (MLCs) prescribed in the standard, while the minimum time-series number is classified depending on whether the load measurements are performed for model validation or empirical load determination. The sampling frequency is prescribed to be at least eight times higher than any significant frequency in the relevant signal, while analogue filters with a cut-off frequency at least three times higher than any significant frequency in the relevant signal shall be used. On Table 3-1 the last column indicates the relevant sampling frequency for the load quantities, as this are usually applied during load measurements campaigns. Current validation campaigns may involve load and load related magnitude measurements on components that are not defined within IEC/TS 61400-13. In the case of testing on the high speed side of the drive train, including torque and rpm measurements, significantly higher sampling rates should be used. The sampling rate, for such measurements, should be appropriate for capturing not only the normal operation but also any transient events, such as grid fault-ride-through events.
Measurement techniques. Measurement techniques cover all techniques that measure properties of a system such as error proneness, understandability, and well-structured-ness [20]. Measurements can help to gain a better understanding if a component or system is fit for use. Furthermore, a high error proneness coupled with a low well- structured-ness can indicate future security problems.
