Document ID: chunk:federal_register_of_legislation:F2023C00161:reg:400:p7
Version: federal_register_of_legislation:F2023C00161
Segment Type: reg
Provision Reference: reg 400 (pt 7/10)
Character Range: 42777–45412

no electrically conducting objects shall be allowed within a cylinder having a diameter of 32mm and a length of 60mm concentric with the reference axis and symmetrical to the arc. Moreover stray magnetic fields shall be avoided.

       4. Ageing

       With the exception of the starting test, all tests shall be carried out with light sources which have been aged for a minimum of 15 cycles having the following switching cycle: 45 minutes on, 15 seconds off, 5 minutes on, 10 minutes off.

       5. Supply voltage

       All tests shall be carried out at test voltage as indicated on the relevant data sheet.

       6. Starting test

       The starting test shall be applied to light sources which have not been aged and have not been used for a period of at least 24 hours prior to the test.

       7. Run-up test

       The run-up test shall be applied to light sources which have not been used for a period of at least 1 hour prior to the test.

       8. Hot restrike test

       The light source shall be started and be operated with the ballast at test voltage for a period of 15 minutes.  The supply voltage to the ballast shall then be switched off for a switch-off period as indicated on the relevant data sheet, and be switched on again.

       9. Electrical and photometric test

       Before any measurement, the light source shall be stabilized for a period of 15 minutes.

       10. Colour

       The colour of the light source shall be measured in an integrating sphere using a measuring system which shows the CIE chromaticity co-ordinates of the received light with a resolution of +/- 0.002.  The following figure shows the colour tolerance area for colour white and the restricted tolerance area for the gas-discharge light sources DlS, D2S AND D2R.

Annex 5

OPTICAL SETUP FOR THE MEASUREMENT OF THE POSITION AND FORM OF THE ARC AND OF THE POSITION OF THE ELECTRODES  [1/]

The gas-discharge light source shall be positioned as shown in figure 1 on sheet DlS/D2S/1 respectively sheet D2R/l.

An optical system shall project a real image A' of the arc A with a magnification of preferably M = s'/s = 20 on a screen.  The optical system shall be aplanatic and achromatic.  In the focus-length f of the optical system a diaphragm d shall cause a projection of the arc with nearly parallel observation directions.  To get the angle of the half divergence not larger than mu = 0.5 degrees the diameter of the focus-diaphragm with respect to the focus-length of the optical system shall be not more than d = 2f tan (mu).

The active diameter of the optical system shall be not more than:

D = (1 + 1/M)d