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For technical questions, contact: sfer@vishay.com

Document Number: 51026

74

Revision: 05-Aug-04

T93

Vishay Sfernice

3/8” Square Multi-Turn Cermet Trimmers

ELECTRICAL SPECIFICATIONS

Resistive Element

cermet

Electrical Travel

19 turns ± 2

Resistance Range

10

W to 2.2MW

Standard series E3

1 - 2.2 - 4.7 and on request 1 - 2 - 5

Tolerance

Standard

± 10%

On Request

± 5%

Power Rating

Linear

0.5W at + 70°C

Logarithmic

not applicable

Temperature Coefficient

See Standard Resistance Element Table

Limiting Element Voltage (Linear Law)

250V

Contact Resistance Variation

2% Rn or 2

W

End Resistance (Typical)

1

W

Dielectric Strength (RMS)

1000V

Insulation Resistance (500VDC)

W

MECHANICAL SPECIFICATIONS

Mechanical Travel

22 turns ± 5

Operating Torque (max. Ncm)

1.5

End Stop Torque

clutch action

Unit Weight (max. g)

1.2

ENVIRONMENTAL SPECIFICATIONS

Temperature Range

– 55°C to + 155°C

Climatic Category

55 / 125 / 56

Sealing

fully sealed

container IP67

POWER RATING CHART

0

50

100

155

0.5

0

AMBIENT TEMPERATURE IN DEGREES CELSIUS

85

70

25

PERFORMANCE

TESTS

CONDITIONS

TYPICAL VALUES AND DRIFTS

D

D

D

DRT

RT

(%)

D

D

D

(%)

Load Life

1000 hours at rated power

90’/30’ - ambient temp. 70°C

± 1%

± 2%

Contact res. variation: < 1% Rn

Climatic Sequence

Phase A dry heat 125°C - 30% Pr

Phase B damp heat

Phase C cold – 55°C

Phase D damp heat 5 cycles

± 0.5%

± 1%

Long Term Damp Heat

56 days

± 0.5%

± 1%

Dielectric strength: 1000V RMS

W

Rapid Temperature Change

5 cycles

– 55°C at + 125°C

± 0.5%

£ ± 1%

Shock

50 g at 11m secs

3 successive shocks

in 3 directions

± 0.1%

± 0.2%

Vibration

10-55 Hz

0.75mm or 10 g

during 6 hours

± 0.1%

£ ± 0.2%

Rotational Life

200 cycles

± 2%

Contact res. variation: < 1% Rn