Series 389 Modular Potentiometer
Cermet—1/2" square
|
|
| Description |
The Series 389 combine up to 8 stackable modules. Single or concentric metal shafts are available with cermet potentiometers and switch modules. Vernier drive is avaiable, as well as a trimmer configuration.
For equivalent units using conductive plastic elements, see Series 388
|
|
|
|
|
| Features: |
| • |
Small size - 1/2 in. square. Stackable - up to 8 modules
|
| • |
Switches - rotary, push-pull, and momentary.
|
| • |
Shafts - 1/4" or 1/8" diameter shafts available in single, dual-concentric, or trimmer configurations. |
| • |
Versatile - Wide range of options: shafts, bushings, terminal styles, resistance values, tapers and tolerances
|
|
|
| Options: |
| • |
Detents - up to 16 positions in mechanical rotation |
| • |
Seals - mounting and shaft seals |
| • |
Medium torque - 1 to 6 oz. in. |
| • |
Center tap - extra terminal |
| • |
Tracking - laser trimming for two or more sections |
| • |
Phasing modules - electrically, mechanically, or both |
| • |
Multi-turns - 3 1/2 and 5-turn vernier drive |
| • |
Clutch drive - for adjustment of two modules, single shaft |
| • |
Push drive - shaft must be pushed to engage shaft |
| • |
Return to center - automatic return to center point |
|
|
|
|
|
Electrical Specifications
|
Resistance Range
|
Linear: 5 ohms to 5 Megohms
Tapered: 100 ohms to 2 Megohms
|
Resistance Tolerance
|
Linear: ±10% (±20% special)
Tapered: ±10% (under 20 ohms is ±20%)
|
Non-linear Tapers
|
Linear: Right or left-hand available.
Non-Linear: Log or reverse Log.
See data sheet for available special tapers.
|
Taper Tolerance
|
±20% of nominal resistance @ 50%
|
Independent Linearity
|
±5% standard. Specials available
|
End Resistance
|
2 ohms max. each end 5 ohms to 2.5Kohms
4 ohms max. each end above 2.5K
|
Tracking
|
10% voltage ratio tracking between sections is standard. Specials available.
|
Working Voltage
|
350 VDC across end terminals
(power not to exceed rating)
|
Power Rating
|
1.0 watt @ 85°C bushing mount
0.5 watt @ 85°C PC mount
Derate linearly to zero watts at 150°C
Derate non-linear taper units by 50%
Derate tapered units or additional section units by 50% of panel unit
|
Dynamic Noise (C.R.V.)
|
3% of total R, standard linear
1.5% of total R, special linear (500 ohms and above)
6% of total R, tapered
|
Static Noise
|
Up to 100 ohms - 30 db; 10K ohms - 15 db; 100K ohms - 10 db
|
Electrical Rotation
|
295° ±5°
|
Effective Rotation
|
265° ±5°
|
|
|
|
Mechanical Specifications
|
Shafts
|
Single, Dual-Concentric, or Trimmer configurations are available.
|
Switches
|
Rotary, Push-Pull, or Momentary Switches are available
|
Bushing Styles
|
Plain, Locking, or Trimmer
|
Bushing Diameters
|
Supplied in 1/4"-32 NEF 2A thread (6.35mm)
and 3.8"-32 NEF 2A thread (9.53mm)
|
Bushing Lengths
|
Plain: 1/4 in.(6.35mm) or 3/8 in.(9.53mm) Split-locking style: 3/8 in. (9.35mm)
|
Terminals
|
PC pins fit .100 grid spacing
See pdf data sheet for other terminal mounting options available
|
Hardware Supplied
|
Hex mounting nut 1/4 in. (6.35mm) x 32 thread standard; Jam hex nut 5/16 in. (7.94mm) for locking type bushings
External rotary shaft seal mounting nut 1/4 in.
|
Mechanical Rotation
|
295° ±5° |
Rotational Life
|
Life under load is 50,000 cycles (10% maximum resistance change)
Trimmer life under load is 5,000 cycles
|
Torque Range
|
.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.
|
Stop Torque
|
3 lb. in. single shaft
2 lb. in. dual concentric shaft
|
Anti-turn Device
|
Location 1 supplied unless otherwise specified (see pdf data sheet)
Anti-turn Device radius is 6.35mm.
|
Housing Material
|
Molded Thermoplastic
|
Marking
|
Consisting of customer part number and State Electronics part number
|
|
|
|
|
|
|
|
|
|
|