BS 62490-1:2010 pdf download – ESL measuring method — Part 1 : Capacitors with lead terminal for use in electronic equipment 1 Scope This part of IEC 62490 provides the equivalent series inductance L (ESL) measuring method for capacitors with lead terminal type for use in electronic equipment. The inductance values of capacitors provided for this document are within the range of 1 nH to 1 0 nH. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. IEC 60384-1 :2008, Fixed capacitors for use in electronic equipment – Part 1: Generic specification 3 Terms and definitions For the purpose of this document, the terms and definitions given in IEC 60384-1 and the following apply. 3.1 equivalent series inductance L ESL inductive part of the impedance of capacitors NOTE 1 The unit of ESL is Henry (H). 4 Measurement jig, short compensation jig, and spacer 4.1 Measurement jig (test fixture) The measurement jig shall have the following features: a) the lead terminal holding method shall be screw up; b) the measurement jig has two pairs of screw-fixation electrodes for fixing the lead terminals of the capacitor to be measured. In pairs, one of the electrodes is fixed to the measurement jig and the other is adjustable for fixing the lead wire. The adjustable electrode shall move only in a direction to hold the lead terminal and shall not rotate around the electrode fixing screw. 4.2 Short compensation jig The short compensation jig shall be the lead wire rod which has the following features of the materials and dimensions, which includes the diameter or the cross-section area: a) materials shall be the same materials as the lead wire of the capacitor to be measured; b) shape shall be as shown in Figure 1 ; c) spacing section (pitch) shall be the same lead spacing as the capacitor to be measured. The tolerance on the lead spacing of a short compensation jig shall be ±0,25 mm; d) the straight section (shank) of the jig length shall be 5 mm to 1 0 mm, depending on what the measurement jig is able to hold. The straight section of the jig shall be kept from bending. 4.3 Spacer These spacers shall be firmly fixed onto the measurement...
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