![4: Electrical tests](/images/new-backgrounds/30680/3068089x1.webp)
5
3.19 Fault finding
Fault IV: lamp flickers.
• Possible cause:
-lamp operating voltage too high, end of lamp life,
-low supply voltage, check ballast connection,
-burning position out of specification.
Fault V: strong blackening of lamp, light output reduction.
• Possible cause:
-overload operation,
-wiring / ballast defect,
-capacitor across lamp instead of mains,
-end of lamp life.
Fault VI: fuse acting shortly after
• Possible cause:
-fuse rating too low or not
-wiring defect, overload operation.
Fault VII: colour differences in lamp colour.
• Possible cause:
-strongly varying burning positions in an installation,
-underload,
-lamps of different operating age or different suppliers,
-lamps of different colours used.
4: Electrical tests
Voltage and current measurements present the possibility of exposure to hazardous voltages and should be performed only by qualified personnel.To measure the correct effective values, true RMS voltmeters have to be used. Measurements with
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| Waveform | True RMS | Peak RMS | Average RMS | ||||
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| calibrated | calibrated |
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Sine wave |
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| 100 | 100 | 100 |
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Square wave |
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| 100 | 71 | 111 |
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Triangular wave |
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| 100 | 120 | 96 | ||||
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electronic load |
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| 100 | 200 | 50 | ||||
current |
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electronic plus |
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| 100 | 166 | 83 | ||||
30 % linear load |
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The parallel compensating capacitor can be measured in two ways:
1)Measure mains current and lamp current.
If both are the same, the capacitor is
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