Test Specification for Eurobalise FFFIS

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Page 40 of 332 SUBSET-085, Issue 2.2.2 November 9, 2007 4.2.3.2.2 Calibration Abstract This calibration procedure will give a reference value P 27RL for each measurement point, defined in clause C1 of Annex C on page 200, which shall be compared with the corresponding value P 27BA for the Balise. The reference value P 27RL is proportional to the square of the current needed for obtaining a flux level of φ d1 through the Reference Area. The current is measured by Power Meter 2 (P M2 ), subsequently compensated, and called P 27RL. The calibration procedure for one of the geometrical positions, [X = 0, Y = 0, Z = 220], shall be performed also under other test conditions than free air, and without the 4.2 MHz Antenna. The result shall be used in subclause 4.2.4 on page 47. 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)
Page 41 of 332 SUBSET-085, Issue 2.2.2 November 9, 2007 4.2.3.2.3 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. Position the 4.2 MHz Antenna in position [X = 0, Y = 0, Z = 100] relative to the Reference Loop. This position shall be fixed during the test. 2. Determine a suitable power level, P L , for a flux of φ d1 . The power, P L , is determined by: P L ( 2 ⋅ π ⋅ f ⋅ φ ) = ⎛ 50 + Z 50 ⋅ ⎜ ⎝ 50 2 d1 2 loop ⎞ ⎟ ⎠ ⋅ B 2 where: f = 27.095 MHz Z loop = R loop + j X loop Ω (actual impedance in the absence of any antenna) P L = Power measured out of the Reference Loop [W] B = Reference Loop matching transfer ratio. P M3 = 10⋅log(PL ⋅1000) − Attenuation [dBm] where: Attenuation equals the attenuation of items 8 and 9 together with the cable from the Reference Loop to the power meter sensor head. 10 Measure the Attenuation and calculate the value of P M3 . Call the calculated value P M3REF . 3. Set the Signal Generator to the frequency 27.095 MHz, and to CW. Repeat for each position 4. Adjust the input power to the Test Antenna in order to achieve approximately φ d1 through the Reference Loop. Record the reading of Power Meter 3 (called P M3 ). 5. Record the reading of Power Meter 2 (called P M2 ). 6. Compensate the P M2 reading with the difference between the P M3 reading and the power level P M3REF calculated in step 2. 11 Call the new value P 27RL . P 27RL = P M2 + (P M3REF - P M3 ), all values in dBm. 7. Perform steps 4, 5, and 6 for all the [X, Y, Z] positions listed in clause C1 of Annex C on page 200. 8. Perform steps 4, 5, and 6 for the different test conditions specified in sub-clause 4.2.3.2.2 at position [X = 0, Y = 0, Z = 220]. 10 11 Assuming that Z loop is small compared to 50 Ω, φ d1 =7.7 nVs, and that the Attenuation equals 20 dB, then the power level PM3 will be –4.6 dBm for the Standard Size Reference Loop. For the Reduced Size Reference Loop, the corresponding value for φ d1 =4.9 nVs is –8.6 dBm. The reason for this compensation is that the relative accuracy for the value of P 27RL between the different positions needs to be very good, and this procedure compensates for signal generator adjustment error.
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Test Specification for Eurobalise FFFIS

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