etaldoc 501/4 page 1 of 4 january 2001 product data sheet line matching transformer P3126 features applications ? 14.6mm seated height ? potentially explosive atmospheres ? vacuum encapsulated ? telecommunications ? compliant with en 50020 and en 60950 ? telemetry ? line matching ? instrumentation description P3126 is a line matching transformer for applications where high performance and safety isolation to the most exacting international standards are required in a compact case size. in conjunction with external protection (e.g. fuses, zener diodes, etc.) the device is compliant with en 50020 for peak rated voltage 375v. signal performance is equivalent to etal? p1200. to electronic techniques (anglia) limited
P3126 etaldoc 501/4 page 2 of 4 january 2001 specifications electrical at t = 25oc and as reference circuit fig. 2 unless otherwise stated. parameter conditions min typ max units insertion loss f = 2khz, r l = 560 ? - - 1.5 db frequency response lf-3db cutoff hf-3db cutoff 200hz ? 4khz - 10 - - - - 50 - 0.2 hz khz db return loss 200hz ? 4khz 18 - - db distortion (1) 0dbm in line, 3rd harmonic f = 450hz - -72 -60 dbm balance dc - 5khz method tg25 80 - - db saturation excitation 50hz 250vrms output voltage across line - - - - 10 65 vrms vpeak voltage isolation (2) 50hz dc 3.88 5.5 - - - - kvrms kv operating range: functional storage humidity ambient temperature -10 -40 - - - - +70 +125 95 oc oc %r.h. lumped equivalent circuit parameters as fig. 1 dc resistance, r dc (3) sum of windings 120 - 148 ? leakage inductance l - 17 - mh shunt inductance lp (4) -43dbm 200hz -43dbm 1khz 2.8 - 4 2 7 - h h shunt loss rp (4) -43dbm 200hz -43dbm 1khz 5 7 - - - - k ? k ? notes: 1. third harmonic typically exceeds other harmonics by 20db. 2. components are 100% tested at 6.5 kvdc. 3. caution: do not pass dc through windings. telephone line current, etc must be diverted using choke or semiconductor line hold circuit. 4. at signal levels greater than ?20dbm l p will increase and r p will decrease slightly but the effect is usually favourab le to the return loss characteristic. equivalent circuit fi g 1
P3126 etaldoc 501/4 page 3 of 4 january 2001 construction dimensions shown are in millimetres (inches). geometric centres of outline and pin grid coincide within a tolerance circle of 0.6mm?. windings may be used interchangeably as primary or secondary. en 50020 para 7.1.2 type 1(a) (side-by-side on separate slots of single piece moulding). fully vacuum encapsulated with hard epoxy resin totally enclosing all internal parts. critical distances (a) distance through bobbin dividing fillet. 1.0mm (b) distance through bobbin walls to conductive core (each winding). 0.5mm (c) distance between highest point of each winding (including lead-outs) and top of dividing fillet. 1.0mm (d) distance between highest point of each winding (including lead-outs) to conductive core through encapsulant. 1.0mm (e) distance through potting box to conductive core. 0.7mm (f) creepage/clearance (in air). 11.0mm
P3126 etaldoc 501/4 page 4 of 4 january 2001 absolute maximum ratings copyright (ratings of components independent of circuit). short term isolation voltage (15s) dc current storage temperature lead temperature, 10s 4.6kvrms, 6.5 kvdc 100 a -40oc to +125oc 260oc etal and P3126 are trade marks of profec technologies ltd. the trade mark etal is registered at the uk trade marks registry. profec technologies ltd. is the owner of the design right under the copyright designs and patents act 1988 and no rights or licences are hereby granted or implied to any third party. ? 2000 profec technologies ltd. reproduction prohibited etal group oy, kuormatie 14, fin-03101, nummela telephone: +358 (0)20 7500 330 fax: +358 (0)20 7500 333 website: www.etalgroup.com email: etalgroup@egruppen.com iso 9001 fm 25326
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