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
6
"