Series 388 and 389 Special Order0 pages

Series 388 Potentiometer

1/2 in. sq., .5 Watt

Series 389 Potentiometer

1/2 in. sq., 1 Watt

Features

• Small size - 1/2 in. square

• Stackable - up to 8 modules

• Switches - rotary, push-pull, push-momentary, multi

position and schadow.

• Versatility - various shaft, bushings, terminal styles,

resistance values, tapers and tolerances

Description

The 388 and 389 series are 1/2 in. square, modular,

stackable potentiometers. The basic construction suits

the series for countless design options; over a billion

configurations are available. The 388 and 389 series can

be found in a wide range of sophisticated systems in a

broad scope of industries.

Special Features

• Detents - single position or up to 16 positions in

mechanical rotation; special detents available

• Seals - mounting and shaft seals

• Medium torque - 1 to 6 oz. in.

• Center tap - extra terminal

• Tracking - laser trimming to keep two or more

sections within a certain relational tolerance.

• Phasing modules - electrically, mechanically, or both

• Multi-turns - 3 1/2 and 5-turn styles

• Clutch drive - independent adjustment of two

modules, single shaft

• Push drive - shaft depressed to actuate pot.

• Return to center - after shaft rotation (clockwise or

counter clockwise), automatic return to center point

Resistance Range

Resistance Tolerance

Taper

Taper Tolerance

Independent Linearity

Series 388 Electrical Specifications

Linear: 100£2 to 5 Megohms

Tapered: 500Q to 2 Megohms

Linear: thru 500KQ ±10%;

above 500KX2 ±20%.

Tapered: thru 100KQ ± 1 0%;

above IOOK£2±20%.

See Charts A and B, page 9 for standard

and special tapers available.

±20% of nominal resistance at 50%

±3% mechanical rotation

±5% standard with specials available

Series 389 Electrical Specifications

Linear: 5Q to 5 Megohms

Tapered: I00£2 to 2 Megohms

Linear: ±10% standard; ±5% special.

Tapered: ±10%.

Under 20ft ±20%.

See Charts A and B, page 9 for standard

and special tapers available.

±20% of nominal resistance at ±50%

mechanical rotation

±5% standard with specials available

End Resistance 4£2 maximum each end linear and low side 2il maximum each end 5Q to 2.5KQ.

of taper. \c/< of total R. high side of taper. 4fi maximum each end above 2.5K

Electrical Specifications continued, next page

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