Series 388 Modular Potentiometer
Conductive Plastic—1/2" square
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| Description |
 The Series 388 modules are 1/2" square, stackable conductive plastic potentiometers and switches. Combine up to 4 modules, with single or concentric metal shafts. Switch modules are available, as well as Vernier Drive. Trimmer configuration available.
For equivalent units using thick-film cermet elements, see Series 389
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| Features: |
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Small size - 1/2 in. square, with up to 8 modules
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Switches - rotary, push-pull, and momentary.
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Shafts - 1/4" or 1/8" diameter shafts available in single, dual-concentric, or trimmer configurations. |
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Versatile - Wide range of options: shafts, bushings, terminal styles, resistance values, tapers and tolerances
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RoHS Compliant
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| Options: |
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Detents - single position or up to 16 positions in mechanical rotation; special detents available |
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Seals - mounting and shaft seals |
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Medium torque - 1 to 6 oz. in. |
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Center tap terminal |
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Tracking - laser trimming to keep two or more sections within a certain relational tolerance |
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Phasing modules - electrically, mechanically, or both |
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Multi-turns - 3 1/2 and 5-turn styles available |
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Clutch drive - independent adjustment of two modules, single shaft |
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Push drive - shaft depressed to actuate pot. |
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Return to center - after shaft rotation (clockwise or counter clockwise), automatic return to center point. |
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Electrical Specifications
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Resistance Range
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Linear: 100 ohms to 5 Megohms
Tapered: 500 ohms to 2 Megohms
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Resistance Tolerance
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Linear: ±10% (above 500K ±20%)
Non-linear: ±10% (above 100K ±20%)
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Non-linear Tapers
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Linear: Right or left-hand available.
Non-Linear: Log or reverse log
See data sheet for available special tapers.
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Taper Tolerance
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±20% of nominal resistance @ 50%
±3% of mechanical rotation
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Independent Linearity
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±5% standard. Specials available
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End Resistance
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Linear: 4 ohms max. each end.
Tapered: low side 4 ohms max.; high side 1% of total resistance.
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Tracking
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10% voltage ratio tracking between sections is standard. Specials available.
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Linearity Tolerance
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±5% independent
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Working Voltage
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350 VDC across end terminals
(power not to exceed rating)
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Power Rating
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0.5 watt @ 70°C.
Derate linearly to zero watts at 120°C
Derate non-linear taper units by 50%
Derate tapered units or additional section units by 50%
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Dynamic Noise (C.R.V.)
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1.5% of total R, standard linear
1.0% of total R, special linear
2.2% of total R, taper.
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Static Noise
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Up to 30Kohms: -20db
100Kohms: -12 db
1 Megohms: +3db.
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Electrical Rotation
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295° ±5°
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Effective Rotation
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265° ±5°
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Mechanical Specifications
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Shafts
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Single, Dual-Concentric, or Trimmer configurations are available.
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Switches
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Rotary, Push-Pull, or Momentary Switches are available
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Bushing Styles
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Plain, Locking, or Trimmer
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Bushing Diameters
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Supplied in 1/4"-32 NEF 2A thread (6.35mm)
and 3.8"-32 NEF 2A thread (9.53mm)
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Bushing Lengths
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Plain: 1/4 in.(6.35mm) or 3/8 in.(9.53mm); Split-locking style: 3/8 in. (9.35mm)
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Terminals
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PC pins fit .100 grid spacing
See pdf data sheet for other terminal mounting options available
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Hardware Supplied
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Hex mounting nut 1/4"(6.35mm) x 32 thread standard; Jam hex nut 5/16"(7.94mm) for locking type bushings
External rotary shaft seal mounting nut 1/4"
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Mechanical Rotation
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295° ±5° |
Rotational Life
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Life under load is 50,000 cycles
(10% maximum resistance change)
Trimmer life under load is 5,000 cycles
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Torque Range
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.20 to 3.0 oz. in. (Single modules)
.3 to 3.5 oz. in. (Dual module)
.5 to 4.5 oz. in. (Triple)
.5 to 5.5 oz. in. (Quad)
Other torque options available.
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Stop Torque
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3 lb. in. single shaft
2 lb. in. dual concentric shaft
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Anti-turn Device
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Location 1 supplied unless otherwise specified (see pdf data sheet)
Anti-turn Device radius is 6.35 mm.
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Housing Material
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Molded Thermoplastic
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Marking
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Consisting of customer part number and State Electronics part number
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