UL 1993-2012 pdf download

UL 1993-2012 pdf download.Self-Ballasted Lamps and Lamp Adapters.
9 Test Apparatus
9.1 General
911 Clause 9.1 summarizes test equipment and environmental conditions needed for the laboratOry facility where testing would be conducted.
9.1.2 Unless otherwise specified, the tests shall be carried out at an ambient temperature of 20 °C to 30
°C with a relative humidity between 30 and 70%. Atmospheric pressure is not specified.
9.1.3 Test equipment shall be in a schedule of initial calibrahon and periodic re-calibration. The frequency of re-calibration for electronic instrumentation shall be as recommended by the instrument manufacturer, but not exceed 1 year between calibrahons.
9.1.4 Test equipment shall have a method of specific identification, such as serial number or a unique laboratory numbering system, so that the equipment used for the test may be noted in the results of the test.
9.2 Instrumentation
9.2.1 The voltage in other than the supply circuit shall be measured using a voltmeter or voltmeter-multiplier combination having a resistance of not less than 10,000 fl/V. Meters having higher input impedances shall be used if the impedance of the circuit under test warrants it. A voltmeter for rneasunng a supply circuit is not specified.
9.2.2 For determining values of voltage, a true rms indicating meter having a frequency response at least three times the frequency Involved and having an adequate crest factor (ratio of peak to rms) shall be used. If applicable, consideration should be given to the DC component of the wave-shape. If a referee mis-voltage measurement is necessary, a meter with an input impedance of 10 Mc shunted by 30 pF of capacitance shall be used.
9.2.3 If it is necessary to determine peak-voltage value, an oscilloscope with a higfl•impedance (10 McI minimum) input probe shall be used.
9.2.4 For thermocouple measurements, either a thermocouple potentiometer or an electronic instrument shall be used. An electronic instrument shall have an accuracy at least as good as the thermocouples described in Clause 9.3.
9.3 Thermocouples
9,3.1 Thermocouples shall consist of wires not larger than 24 AWG (0.21 mm2) and not smaller than 30 AWG (0.05 mm2). It is standard practice to employ thermocouples consisting of 30 AWG iron-constantan (Type J) wires and a potenbomeler-lype or electronic instrument; and such equipment shall be used whenever referee temperature measurements by thermocouples are necessary. The thermocouple wire shall conform to the requirements for thermocouples as listed in the table of special limits of error of thermocouples in ANSI.lSA MC961.
9.3.2 Thermocouples consisting of chromel-alumel (Type K) or copper-constantan (Type T) wires may be used If It Is determined that high-frequency ballast operation results In eddy current heating of iron-constantan thermocouples.
9.4 Plywood test box material
9.4.1 The plywood used for constructing temperature test boxes shall be 12-mm (112-in trade size) thick with at least one side that has all voids filled and sanded.
9.5 Temperature test box
9.5.1 Test apparatus for a device with an input rating less than 50 W
9.5..1i The test fixture shall be a steel or aluminum cylinder, closed at the top. The smaller cylinder shall be 152 mm (6 in) in diameter and 216 mm (8.5 in) deep, while the larger cylinder shall be 203 mm (8 in) in diameter and 280 mm (11 in) deep. The cylinders shall be fabricated of steel or aluminum, having a thickness between 0.76 and 1.27mm (0.03 and 0.05 in). The cyliinders shall be painted white on all sides. Each cylinder shall be Installed in a rectangular test box having four sides. a top. and bottom. The cylinder shall be flush to the test box bottom and the wood bottom shall have an opening the size of the cylinder diameter. The test box sides shall be constructed of plywood described in Clause 9.4.1. Three skfes and the top shall be 13 mm (0.5 In) from the nearest part of the cylinder. The fourth side shall be 76 mm (3 in) from the nearest part of the cylinder. The supply lampliolder shall be porcelain coated and have a cast metal cap bearing against the cylinder top. See Figure 9.1.