P3127

PRODUCT DATA SHEET PICK-OFF TRANSFORMER Features ∗ 14.6mm seated height ∗ Vacuum encapsulated ∗ Compliant with EN 50020 and EN 60950 P3127 Applications ∗ ∗ ∗ ∗ ∗ Potentially explosive atmospheres Telecommunications 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. ETALDOC 502/5 Page 1 of 4 to Electronic Techniques (Anglia) Limited August 2001 P3127 SPECIFICATIONS Electrical At T = 25ºC and as reference circuit Fig. 2 unless otherwise stated. Parameter Voltage isolation (1) Balance Input impedance Operating range: Functional Storage Humidity Conditions 50Hz DC DC - 5kHz Method TG25 200Hz – 4kHz, Fig 2 Ambient temperature -10 -40 +70 +125 95 ºC ºC %R.H. Min 3.88 5.5 50 20 Typ Max Units kVrms kV dB kΩ Lumped equivalent circuit parameters as Fig. 1 DC resistance, RDC (2) Leakage inductance ΔL Shunt inductance Lp Shunt loss Rp Sum of windings (Corrected for ratio) Referred to pins 1-3 -43dBm 200Hz -43dBm 200Hz 3.8 70 170 1860 67 Ω mH H kΩ Notes: 1. 2. Components are 100% tested at 6.5 kVDC. Caution: do not pass DC through windings. Telephone line current, etc must be diverted using choke or semiconductor line hold circuit. ETALDOC 502/5 Page 2 of 4 August 2001 P3127 Equivalent Circuit Fig 1 Recommended Circ uit Fig 2 T hrough "loss" (inc luding voltage ratio) 4.77dB plus less than 0.8dB excluding effect of any DC bloc king c apac itor. Response: ± 0.3dB 200Hz - 4kHz CONSTRUCTION Dimensions shown are in millimetres (inches). Geometric centres of outline and pin grid coincide within a tolerance circle of 0.6mmØ. 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) (b) Distance through bobbin dividing fillet. Distance through bobbin walls to conductive core (Each winding). ≥1.0mm ≥0.5mm (e) (f) (c) Distance between highest point of each winding (including lead-outs) and top of dividing fillet. Distance between highest point of each winding (including lead-outs) to conductive core through encapsulant. Distance through potting box to conductive core. Creepage/clearance (in air). ≥1.0mm (d) ≥1.0mm ≥0.7mm ≥11.0mm ETALDOC 502/5 Page 3 of 4 August 2001 P3127 ABSOLUTE MAXIMUM RATINGS (Ratings of components independent of circuit). Short term isolation voltage (15s) DC current Storage temperature Lead temperature, 10s 4.6kVrms, 6.5 kVDC 100μA -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 COPYRIGHT 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 ETALDOC 502/5 Page 4 of 4 August 2001