Model 302

www.vishay.com

Vishay Spectrol

Revision: 22-Nov-16

3

Document Number: 57057

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

Note

• Nothing stated herein shall be construed as a guarantee of

quality or durability.

POWER RATING CHART

(Ratings for cup No. 1. Additional cups 75 % of values

shown)

MECHANICAL SPECIFICATIONS

PARAMETER

Rotation

360° (continuous)

Bearing type

Servo and screw mount: ball

Bushing mount: sleeve

Ganging

6 sections maximum, terminal alignment, added sections, within ± 10° of section 1 terminals

Torque (maximums)



Servo and screw (1 section)



Bushing (1 section)



Each added section

STARTING

1.0 oz. - in (72.00 g - cm)

1.7 oz. - in (122.42 g - cm)

0.6 oz. - in (43.21 g - cm)

RUNNING

0.5 oz. - in (36.00 g - cm)

1.0 oz. - in (72.00 g - cm)

0.4 oz. - in (28.80 g - cm)

Mechanical runouts (maximums)



Shaft (TIR/in)



Pilot dia. (TIR)



Lateral (TIR)



Shaft end play



Shaft radial play

SERVO AND SCREWING

0.002" (0.05 cm)

0.002" (0.05 cm)

0.003" (0.08 cm)

0.005" (0.13 cm)

0.002" (0.05 cm)

BUSHING

0.002" (0.05 cm)

0.002" (0.05 cm)

0.005" (0.13 cm)

0.005" (0.13 cm)

0.003" (0.08 cm)

Moment of inertia

Weight (maximums)



Single section:



Each additional section:

4.0 oz. (113.40 g)

1.2 oz. (34.02 g)

MATERIAL SPECIFICATIONS

Housing and lids

Aluminum, anodized

Shaft and clamp rings

Stainless steel, non-magnetic

non-passivated

Terminals

Brass, plated for solderability

Bushing mount hardware



Lockwasher internal tooth:



Panel nut:

Steel, nickel plated

Brass, nickel plated

ENVIRONMENTAL SPECIFICATIONS

Vibration

15 g thru 2000 Hz

Shock

50 g

Salt spray

96 h

Rotational life

1 million shaft revolutions

Temperature range

-55 °C to +125 °C

MARKING

Unit identification

Units shall be marked with Vishay Spectrol name, model no and date code, and on each section,

resistance, resistance tolerance, linearity and terminal identification.



Example of a marking for a standard part: 302-11202

AMBIENT TEMPERATURE IN °C

20

40

60

80

100

120

140

160

0

2

4

6

8

SPECIAL 150 °C

STANDARD 125 °C

RESISTANCE ELEMENT DATA

RESISTANCE

VALUES

(

)

RESO-

LUTION

(%)

OHMS

PER

TURN

MAXIMUM

CURRENT

AT 40 °C

AMBIENT

(mA)

MAXIMUM

VOLTAGE

ACROSS

COIL

(V)

WIRE

TEMP.

COEF.

(ppm/°C)

5

0.320

0.016

893

4.48

800

10

0.200

0.020

633

6.32

800

20

0.165

0.033

447

8.95

800

50

0.148

0.074

283

14.1

800

100

0.151

0.151

200

20.0

20

200

0.126

0.252

141

28.4

20

500

0.115

0.573

89.4

44.7

20

1K

0.098

0.981

63.3

63.2

20

2K

0.085

1.70

44.7

89.5

20

5K

0.059

2.93

28.3

141

20

10K

0.051

5.16

20.0

200

20

20K

0.043

8.55

14.1

284

20

50K

0.032

15.80

8.94

447

20