178991-1

Wire Wound Fixed Resistor

A resistor whose ohmic value cannot be adjusted or varied. The resistance element consists of high resistance wire (or ribbon) either wound on an insulated form or constructed so as to be self supporting. Opposition to the flow of current is an inherent property of the resistance wire and is manifest by the heat dissipation in the resistor. Excludes:suppressor,ignition interference.

-5.0 to 65.0 temp range of temp coefficient in deg celsius, -2.5 to 2.5 temp coefficient of resistance in ppm per deg celsius, 85.0 ambient temp in deg celsius at zero percent rated power, 2.500 megohms electrical resistance, -0.005 to 0.005 resistance tolerance in percent

Basic Details

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NSN

5905-00-082-1237

NIIN

00-082-1237

Item Name

Wire Wound Fixed Resistor

Part Number

178991-1

Active

Federal Supply Class

5905 - Resistor

Federal Supply Group

Electrical and Electronic Equipment Components

Assigment Date

01/01/1961 (65 years ago)

Item Name Code

00010

Technical Specifications

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Temp Coefficient Of Resistance In Ppm Per Deg Celsius: -2.5 to 2.5
Electrical Resistance: 2.500 megohms
Resistance Tolerance In Percent: -0.005 to 0.005
Ambient Temp In Deg Celsius At Zero Percent Rated Power: 85.0
Temp Range Of Temp Coefficient In Deg Celsius: -5.0 to 65.0
Reliability Indicator: not established
Body Diameter: 0.500 inches nominal
Body Length: 2.000 inches nominal
Power Dissipation Rating In Watts: 2.000 free air
Ambient Temp At Full Rated Power: 55.0 celsius
Inclosure Type: encapsulated
Terminal Type: wire lead
Style Designator: axial terminal each end
Test Data Document: 50222-178991 drawing (this is the basic governing drawing, such as a contractor drawing, original equipment manufacturer drawing, etc.; excludes any specification, standard or other document that may be referenced in a basic governing drawing)

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Cross Referenced Parts

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Part Number	CAGE	Manufacturer	RNCC	RNVC	RNAAC
178991-1	09017	Edo	3	9	TX

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