Test Specification for Eurobalise FFFIS

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Page 48 of 332 SUBSET-085, Issue 2.2.2 November 9, 2007 4.2.4.2 Calibration of 4.2 MHz for Balise Input to Output Characteristics 4.2.4.2.1 Calibration Configuration A proposed calibration set-up is shown in Figure 14 below. Clause F1 of Annex F on page 287 gives an example of suitable test equipment. If Power Meter 2 is substituted, by for instance a spectrum analyser, then the measurement bandwidth of this device shall be 1.2 MHz. The Test Antenna (item 5) and the cable from the Test Antenna to Power Meter 1 (the sensor head), shall be the same as in the calibration procedure in sub-clause 4.2.3.2 on page 39. See also sub-clause 4.2.1 on page 23. 10. Power Meter 1 P M1 11. Attenuator Balun 14. 3. RF Amplifier Reference Loop Interface ‘A’ 7. 2. Attenuator 50 Ω 50 Ω CS 27 MHz Test Antenna 5. 13. Signal Generator 15. Power Meter 2 P M2 12. Filter 4.2 MHz Figure 14: Test set-up for calibration of 4.2 MHz Balise Loop Current
Page 49 of 332 SUBSET-085, Issue 2.2.2 November 9, 2007 4.2.4.2.2 Calibration Abstract This calibration procedure will give a reference value P 42RL used in sub-clause 4.2.4.3 on page 50. The reference value P 42RL is reflecting the flux received by the Test Antenna, measured by Power Meter 2 (P M2 ). The calibration is performed with the current I u2 /B through the Reference Loop. The current through the Reference Loop is monitored by Power Meter 1 (P M1 ). The calibration procedure shall be performed also under other test conditions than free air. The following test conditions specified in clause B5 of Annex B on page 185 shall be used: Debris: Salt Water, debris class (A or B) defined by the manufacturer. Clear Water, debris class (A or B) defined by the manufacturer. Iron Ore (Magnetite), debris class (A or B) defined by the manufacturer. Metallic object: Metallic plate underneath the Balise, Case 1. Steel Sleepers Other Sleepers (mounting assemblies) 4.2.4.2.3 Calibration Procedure 1. Position the Standard Test Antenna in position [X = 0, Y = 0, Z = 220] relative to the Reference Loop. Be sure to position the electrical centre of the Test Antenna aligned with the electrical centre of the Reference Loop. Also check that the X, Y, and Z axes of the Reference Loop are correctly aligned to the X, Y, and Z axes of the positioning system. 2. Set the Signal Generator to generate the FSK signal that carries telegram type 1. 3. Calculate the exact power level P lc that gives I u2 /B in the Reference Loop. For calibration and compensation of the Current Sense Balun see clause H5 of Annex H on page 317. 4. Adjust the Signal Generator amplitude in order to achieve a current of approximately I u2 /B through the Reference Loop, measured by Power Meter 1. 5. Record the reading of Power Meter 1 (called P M1 ) and Power Meter 2 (called P M2 ). 6. Compensate the P M2 reading with the difference between the P M1 reading and the exact power level, P lc for I u2 /B, from the Current Sense Balun calibration in step 3. 13 Call the new value P 42RL . P 42RL = P M2 + (P lc - P M1 ) all values in dBm. The calibration procedure (steps 4 trough 6) shall be repeated for the test conditions defined in sub-clause 4.2.4.2.2. 13 The reason for this compensation is that the absolute accuracy for the value of P 42RL needs to be good, and this procedure compensates for power amplifier drift and adjustment errors.
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Test Specification for Eurobalise FFFIS

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