etaldoc 502/5 page 1 of 4 august 2001 product data sheet pick-off transformer P3127 features applications ? 14.6mm seated height ? potentially explosive atmospheres ? vacuum encapsulated ? telecommunications ? compliant with en 50020 and en 60950 ? pick-off applications ? telemetry ? instrumentation description P3127 is a high impedance 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. P3127 has a turns ratio of 1.732:1 giving an impedance transformation of 3:1. P3127 is designed for ?listening? applications when placed across a line, presenting a very high impedance to minimize circuit loading. signal performance is equivalent to etal? p1487. to electronic techniques (anglia) limited
P3127 etaldoc 502/5 page 2 of 4 august 2001 specifications electrical at t = 25oc and as reference circuit fig. 2 unless otherwise stated. parameter conditions min typ max units voltage isolation (1) 50hz dc 3.88 5.5 - - - - kvrms kv balance dc - 5khz method tg25 50 - - db input impedance 200hz ? 4khz, fig 2 20 - - k ? 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 (2) sum of windings (corrected for ratio) - - 1860 ? leakage inductance l referred to pins 1-3 - 170 - mh shunt inductance lp -43dbm 200hz 3.8 - 67 h shunt loss rp -43dbm 200hz 70 - - k ? notes: 1. components are 100% tested at 6.5 kvdc. 2. caution: do not pass dc through windings. telephone line current, etc must be diverted using choke or semiconductor line hold circuit.
P3127 etaldoc 502/5 page 3 of 4 august 2001 construction dimensions shown are in millimetres (inches). geometric centres of outline and pin grid coincide within a tolerance circle of 0.6mm?. 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 re c o m m e n d e d c i r c u i t fi g 2 through "loss" (including voltage ratio) 4.77db plus less than 0.8db excluding effect of any dc blocking c apacitor. response: 0.3db 200hz - 4khz equivalent circuit fi g 1
P3127 etaldoc 502/5 page 4 of 4 august 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 P3127 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. ? 1997 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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