Safety Standards for Medical Electronics Industry
Transformer products used in the medical electronics industry must meet stringent safety standards according to UL544 or equivalent foreign safety standards (CSA c22.2 No. 125, VDE 0551, IEC 601.1). For patient connected equipment, extra low leakage currents are required and must be specified by the customer. We guarantee leakage currents as low as 10uA when requested. UL family recognition to UL544 is available for class A and class B insulation systems.

Safety Standards for Non-Medical Applications
All our transformers for non-medical applications are designed to comply with UL1411 or UL1950. When requested, the transformers will also comply with equivalent foreign safety standards (CSA c22.2 No.66, 1988 revision, VDE 0550, IEC 742, EN 60742 or IEC 1950). UL family recognition is available for class A and class B insulation systems.

International Safety Standards
As mentioned above, we are thoroughly familiar with the various foreign safety standards. We offer our assistance to have our custom designed transformers tested by TUV or other testing laboratories you choose to do the evaluation. All our transformers are built with required creep distance and insulation system to pass 4000V Hi-pot test between primaries and secondaries. Our technical bulletin No. 2 gives you helpful information on recommended primary windings for overseas markets.

Processing Customer Request for Quotation
You will be contacted by our design engineer, should there be any questions of how to interpret your requirements. Our aim is to provide you with the most economical design that will still comply with your electrical and mechanical specifications. Using our proprietary software programs, our design engineers calculate the required electrical data, assisted by highly accurate mathematical formulae for your DC data after rectification. Wire sizes, number of turns, and core sizes are also chosen from a computer generated menu. This menu offers several choices so that we can readily determine the design that will best meet your specific requirements and application. You would of course need to tell us of any special measurements that you would like to have done that are not a part of our standard test procedures, listed in this document. You will receive our quotation with a technical schematic outlining all the important data of our proposed design, including electrical and mechanical data as well as test parameters. The schematic gives you the opportunity to review with 100% assurance that your specifications have been correctly interpreted.

Processing Prototype Orders
As your order is entered into our system, our design engineering group will generate a datasheet with more details than the schematic and submitted to you for approval. This procedure gives you another opportunity to review your exact requirements and that they are correctly interpreted by us before the actual prototype is manufactured and sent to you for evaluation. Your review of our datasheet helps us make sure that the prototype will meet your own specifications - the first time around.

Processing Production Orders
Upon approval of the prototype, our production department releases your order for production and delivery as per agreed upon schedule. A sophisticated computerized shop loading system, helps us make timely shipments.

Quality Assurance
Although computerized winding equipment is used, the uniform quality of our transformers is the result of skilled operators. Training of operators and supervisors and weekly quality review meetings are steps that we take to maintain consistent quality of workmanship between different lots. In addition, in-process inspection of each lot is performed to correct and errors during each manufacturing step. These meetings also provide the forum for suggestions and discussions of quality improvements.

Final Inspection
All transformers and choke products are subjected to 100% final inspection of electrical and mechanical data. Our standard electrical tests include no-load currents and no-load voltages; 4000VAC Hi-Pot test for 2 seconds between primaries and secondaries. Winding resistance's are verified on every production lot. Visual inspection includes physical dimensions and appearances. Additional tests can be specified by customer, such as maximum level of magnetic strayfields, mechanical hum, leakage current, voltage and current data under load, etc.

Production Material
All material used in our production is UL/CSA listed, when applicable. Multi-source purchasing policy is maintained whenever necessary to assure availability and no interruption on the shop floor.

Steel Core Production
Laser scribed or Plasma etched High-B, grain oriented Silicon Steel is used in our core production. Sample test is done of each lot and size. Cores for applications that require Low-B steel are purchased and subject to the same inspection procedures. Maintaining high Core quality is important for the overall performance of our transformers.

Packing
Unless otherwise specified by the customer, transformers and mounting hardware are packed in re-enforced, heavy duty double-wall corrugated cardboard boxes with a total weight of 25-30 Lbs. for easy handling. Larger shipments are palletized for motor carrier.