ANSI C82.2-2002 pdf download For Lamp Ballasts — Method of Measurement of Fluorescent Lamp Ballasts
4.2 Line voltage wave shape Throughout the full range of test requirements the AC voltage supply at the input terminals to the ballast-lamp combination shall have a wave shape such that the RMS summation of the harmonic components does not exceed 3 % of the fundamental.
4.3 Stability of supply voltage The line voltage shall be as steady and free from sudden changes as possible. For best results the voltage should be regulated to within 0.1%. If adequate automatic regulation is not available, constant checking and readjustments are essential for obtaining accurate measurements.
4.4 Supply-source impedance The supply source shall have sufficient power capacity and sufficiently low impedance, compared with the ballast impedance, to ensure that the voltage to the ballast or lamp-ballast combination does not vary by more than 3% with the lamp- ballast combination in and out of the circuit.
5 Electrical supply characteristics – reference ballast measurement circuits The general characteristics of reference ballasts are described in ANSI C82.3 and ANSI C78.375. The specific values of impedance, reference current, and rated input voltage for the reference ballasts corresponding to each lamp type are given in the appropriate lamp data sheets. The reference ballast while operating fluorescent lamps shall meet all electrical supply characteristics cited in ANSI C82.3 and ANSI C78.375.
6 Ambient conditions for lamp measurements Variations in ambient temperature, air movement along the bulb wall surface, and lamp burning positions can affect the electrical characteristics as well as the output of a reference lamp. The ambient conditions for lamp measurements cited in ANSI C78.375 shall be followed when testing line frequency ballasts on reference lamps. Unless otherwise specified, the ambient temperature for all tests is 25 O C ± 1 O C.
7 Test measurement circuits
7.1 Circuit grounding In all of the wiring diagrams shown in the standard, the side containing the instrument’s current coil is shown connected to the grounded supply conductor. This is a recommended safety precaution, since many types of portable instruments have current coil terminals that are not insulated and that can constitute a shock hazard if not kept at ground potential. In those situations where the available power source is grounded at some other potential (for example, a 120/240, three-wire supply with a midpoint ground), the grounded connection as shown in these diagrams shall not be