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MIL-R-93 Resistors, Fixed, Wire-Wound, Accurate, General Specification ForThis specification covers the general requirements for accurate, wire-wound, fixed resistors having a maximum resistance tolerance of 1 percent, with the winding protected against high humidity. The resistors are rated for continuous full load operation at any ambient temperature up to 125 Degrees C, and derated up to 145 Degrees C. They are not capable for application where alternating current ac characteristics are of critical importance. Performance characteristics are in accordance with table I.

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MIL-R-93F

* TABLE I. Performance characteristics.

Characteristics

Style

Resistance tolerance (percent ±)

.05, .1,

.5, 1

.05, .1,

.5, 1

.05, .1,

.5, 1

.05, .1,

.5, 1

.05, .1,

.5, 1

.05, .1,

.5, 1

.05, .1,

.5, 1

Minimum resistance (ohms)

100, 10,

.1, .1

100, 10,

.1, .1

100, 10,

.1, .1

100, 10,

.1, .1

100, 10,

.1, .1

100, 10,

.1, .1

100, 10,

.1, .1

Maximum resistance (megohms)

1.5

.750

.511

.226

.127

.301

.100

Resistance temperature

Characteristic

Under 1 ohm

1 to 10 ohms

10 ohms to max

±90

±50

±20

±90

±50

±20

±90

±50

±20

±90

±50

±20

±90

±50

±20

±90

±50

±20

±90

±50

±20

Power rating (watt) at 125°C

.33

.25

.15

.125

.25

.125

Maximum operating voltage (volts)

600

300

---

150

---

Maximum percent change in

Resistance 1/

Life (full load at 125°C) Short time overload Thermal shock

Moisture resistance

Dielectric withstanding voltage

Terminal strength

Low temperature operation Low temperature storage High temperature exposure Shock, specified pulse

Vibration, high frequency

±0.5

±0.1

±0.2

±0.25

±0.05

±0.25

±0.20

±0.50

±0.10

±0.5

±0.1

±0.2

±0.25

±0.05

±0.25

±0.20

±0.50

±0.10

±0.5

±0.1

±0.2

±0.25

±0.05

±0.25

±0.20

±0.50

±0.10

±0.5

±0.1

±0.2

±0.25

±0.05

±0.25

±0.20

±0.50

±0.10

±0.5

±0.1

±0.2

±0.25

±0.05

±0.25

±0.20

±0.50

±0.10

±0.5

±0.1

±0.2

±1.00

±0.05

±0.25

±0.20

±0.50

±0.10

±0.5

±0.1

±0.2

±1.00

±0.05

±0.25

±0.20

±0.50

±0.10

Insulation resistance (megohms)

Before moisture resistance

After moisture resistance

1,000

100

1,000

100

1,000

100

1,000

100

1,000

100

1,000

100

1,000

100

NOTE: All "C" terminals are solderable in accordance with method 208 of MIL-STD-202 .

1/ Where total resistance change is 1 percent or less, it is considered as ±(_percent + 0.05 ohm).

TABLE II. Temperature characteristic and terminal.

Symbol

Terminal

Maximum ambient temperature

at rated wattage

Maximum ambient temperature (at zero

percent rated wattage dissipation)

C W

Solderable

Weldable

125°C

145°C

1.2.1.3 Resistance temperature characteristic. The resistance temperature characteristic is identified by a single letter in accordance with table III.

TABLE III. Resistance temperature characteristic.

Symbol	<1 ohm	1 ohm < 10 ohms	10 ohms and above
E	±90 ppm	±50 ppm	±20 ppm