Power Resistor

VISHAY Huntington - HEI - FST50A/400R Resistor, Ceramic. 400 Ohm NI.

Marked NI: Non-inductive style (special “NI”) with Ayrton-Perry winding. Ayrton–Perry windings of resistance wire are used to make wirewound RF resistors that are used at high frequencies, where inductance and capacitance are unwanted.The winding is made of two separate wires wound in opposing directions along an insulating form and connected in parallel at the ends. Since there are the same number of turns of wire in either direction, the magnetic fields of the two wires cancel each other out, so the coil has little inductance; and since adjacent turns of the two wires are at approximately the same voltage, there is little parasitic capacitance between the turns.

Power: 60 watt.

Weight: 65.6 g

Technology: Wirewound Non-inductive.

Dimension: 4" (101.4mm) long x 0.878" (22.3mm) diameter, each with (2) 1/4" QC terminals.

Overall: 90.5mm mounting Centers.

More info: http://www.heiresistors.com/PDF/FVT_FST25%20spec.pdf Huntington Electric Inc.

WARD LEONARD - RWF60W150 Resistor, Ceramic.

Resistance: 150 Ohm.

Power: 60 watt.

Technology: Wirewound.

Enamel coated.

Dimensions: 1.011" D x 4-1/16" long.

Radial lug.

Alternate: W150WL

WARD LEONARD - RWF60W200 - BR200WL - NI Resistor, Ceramic.

A non-inductively wound resistor uses Ayrton-Perry Winding technique which has one winding in one direction and one in the other. Since there are the same number of turns of wire in each direction, the magnetic fields of the two wires cancel each other to nullify inductance. One disadvantage of this technique is that it requires twice the length of coil to make given resistance as compared to standard winding. Ayrton-Perry windings are used in resistor to eliminate parasitic inductance at high frequencies.

Type E

Resistance: 200 Ohm.

Power: 60 watt.

Non-Inductive.

Enamel Coated.

Dimensions: 3-3/4" long x 0.788" wide x 0.90" high.

Radial Lug.

Alternate: BR200WL, FST50A/200R.

New Old Stock

Applications: A non inductive resistance is a resistance which has no inductance. Such, resistance are required in high frequencies as well as in high speed digital circuit. The magnetic field generated by each other cancel out each other effect.

Made in USA