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CCFL
Measurement
Specific precautions are required for measuring the CCFL, (cylindrical) area peculiar to CCFLs are involved. Precautions and
because, in addition to electrical features related to high voltage and suggestions for the measurement of CCFLs are described below for
high frequency, optical features of the very small and non-planar your reference.
1 Measuring Equipment
The measuring equipment (including power supply, measuring
instruments, etc.) is introduced below. Fig. 15 Dedicated Power Supply
NF Corp. AS114
1-1 Power Supply and Electrical Measuring Instruments (*18pF)
1-1-1 Power Supply
A power supply generating 40 to 60 kHz frequency close to CCFL
sine waves is generally used for CCFL measurement. Sanken uses a
DC stabilized power supply combined with an inverter adapted to
mA V
the customer specification or a specially designed integrated power
supply (NF Corporation Model AS114 cold cathode discharge
characteristics testing system). The output voltages of either power
supply are variable and measurement is performed after confirming (2) The circuit diagram shall indicate the manufacturer name and the
that there is no variation which may affect the measurement. type number of measuring instruments in use. When a dedicated
power supply is used, the manufacturer name and the type
1-1-2 Measuring Instruments number shall be also indicated.
The AC measuring instruments as well as instruments built-in (3) Cables connecting the instruments to the lamp shall conform to
in the power supply indicate the results of measurement in the the relevant standards for cables (pressure withstand, etc.). The
effective values. The standard instruments used at Sanken are listed cable length must be as short as possible to prevent leakage
below for your reference. current generated by high frequency and high voltage.
Current measurement:
Yokogawa Electric YEW Model 2016 high-frequency AC
ammeter
1-2 Optical Measuring Equipment
Voltage measurement: 1-2-1 Place for Measurement
NF Corporation Model AS114 cold cathode discharge The measurement shall take place at a place where the lamp
characteristics test system surface is not affected by wind and the conductive object should not
be located near the lamp to prevent leakage current. Ambient
1-1-3 Circuitry temperature of the place of measurement shall be 25