RH, NH

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Vishay Dale

Revision: 26-Feb-16

4

Document Number: 30201

For technical questions, contact: ww2aresistors@vishay.com

THIS DOCUMENT IS SUBJECT TO CHANGE WITHOUT NOTICE. THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT

ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT www.vishay.com/doc?91000

MATERIAL SPECIFICATIONS

Element: Copper-nickel alloy or nickel-chrome alloy,

depending on resistance value

Core: Ceramic, steatite or alumina, depending on physical

size

Encapsulant: Silicone molded construction

Housing: Aluminum with hard anodic coating

End Caps: Stainless steel

Standard Terminals: For RH005 through RH050 size

terminal finish - Tin/lead is 60/40 Sn/Pb w/Nickel underplate

and

Lead (Pb)-free is Ni/Pd/Au, finish is on copper clad

steel core terminal. For RH100 and RH250 terminals are

threaded stainless steel.

Part Marking: Dale, model, wattage, value, tolerance, date

code

NH NON-INDUCTIVE

Models of equivalent physical and electrical specifications

are available with non-inductive (Ayrton-Perry) winding.

They are identified by substituting the letter N for R in the

model number (NH005, for example).

SPECIAL MODIFICATIONS

A number of special modifications to the aluminum housed

resistor

style

are

available

upon

request.

Special

modifications include:

• Terminal configurations and materials

• Resistance values and tolerances

• Low resistance temperature coefficient (RTC)

• Housing configuration

• Threaded mounting holes

• Preconditioning and other additional testing

APPLICABLE MIL SPECIFICATIONS

Vishay RH and NH resistors are listed as qualified on the

MIL-PRF-18546 QPL. MIL-PRF-18546 qualified, type RE

resistors can be found at:

www.vishay.com/doc?30282



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PERFORMANCE

TEST

CONDITIONS OF TEST

TEST LIMITS

Thermal Shock

Rated power applied until thermally stable, then a minimum of 15 min at - 55 °C

± (0.5 % + 0.05

) R

Short Time Overload

5 x rated power for 5 s

± (0.5 % + 0.05

) R

Dielectric Withstanding



Voltage

1000 Vrms for RH005, RH010 and RH025; 2000 Vrms for RH050;

4500 Vrms for RH100 and RH250; duration 1 min

± (0.2 % + 0.05

) R

Temperature

250 °C for 2 h

± (0.5 % + 0.05

) R

Moisture Resistance

MIL-STD-202 Method 106, 7b not applicable

± (1.0 % + 0.05

) R

Shock, Specified Pulse

MIL-STD-202 Method 213, 100 g’s for 6 ms, 10 shocks

± (0.2 % + 0.05

) R

Vibration, High Frequency

Frequency varied 10 Hz to 2000 Hz, 20 g peak, 2 directions 6 h each

± (0.2 % + 0.05

) R

Load Life

1000 h at rated power, + 25 °C, 1.5 h “ON”, 0.5 h “OFF”

± (1.0 % + 0.05

) R

Terminal Strength

30 s, 5 pound pull test for RH005 and RH010, 10 pound pull test for other sizes;



torque test - 24 pound inch for RH100 and 32 pound inch for RH250

± (0.2 % + 0.05

) R