Features
■ Non-standard features and
specifications available
■ 7/8 ” (22 mm) diameter single-turn
conductive plastic
■ Bushing mount
■ Excellent resolution
■ High rotational life – ball bearing
shaft support
6638 - Precision Potentiometer
Electrical Characteristics1
Product Dimensions
Standard Resistance Range....................................................................................1 K to 100 K ohms
Total Resistance Tolerance ......................................................................................................... 10 ꢀ
Independent Linearity ................................................................................................................... 1 ꢀ
Effective Electrical Angle.......................................................................................................340 ° 3 °
End Voltage .................................................................................................................0.5 ꢀ maximum
Output Smoothness ....................................................................................................0.1 ꢀ maximum
Dielectric Withstanding Voltage (MIL-STD-202, Method 301)
6638
7/8 " (22 mm) DIA.
2
5.08
(.20)
R
CW
3
1
Sea Level .............................................................................................................750 VAC minimum
Power Rating (Voltage Limited By Power Dissipation or 300 VAC, Whichever is Less)
+70 °C......................................................................................................................................1 watt
+125 °C....................................................................................................................................0 watt
Insulation Resistance (500 VDC)..................................................................1,000 megohms minimum
Resolution..................................................................................................................Essentially infinite
45 ° ± 5 °
1.57
(.062)
7.14 + .00/- .05
(.281+.000/-.002)
1/4"-32 UNEF-THD
13.64 ± .38
(.537 ± .015)
DIA.
Environmental Characteristics1
Operating Temperature Range...................................................................................+1 °C to +125 °C
Storage Temperature Range.....................................................................................-65 °C to +125 °C
Temperature Coefficient Over Storage Temperature Range........................... 500 ppmꢁ°C maximum
Vibration .........................................................................................................................................15 G
Wiper Bounce...........................................................................................0.1 millisecond maximum
Total Resistance Shift .............................................................................................. 5 ꢀ maximum
Voltage Ratio Shift ................................................................................................ 0.5 ꢀ maximum
Shock .............................................................................................................................................50 G
Wiper Bounce...........................................................................................0.1 millisecond maximum
Total Resistance Shift .............................................................................................. 5 ꢀ maximum
Voltage Ratio Shift ................................................................................................ 0.5 ꢀ maximum
Load Life.................................................................................................................1,000 hours, 1 watt
Total Resistance Shift ............................................................................................ 10 ꢀ maximum
Rotational Life (No Load) .........................................................................20,000,000 shaft revolutions
Total Resistance Shift ............................................................................................ 10 ꢀ maximum
Moisture Resistance (MIL-STD-202, Method 106)
3.170 + .000/-.008
DIA.
(.1248+.0000/.0003)
.25
45 ° ± 5° X
(.010)
CHAMFER
22.23
(7/8)
DIA.
9.53
(3/8)
3.18
(1/8)
22.23
(7/8)
.38
(.015)
SHAFT SLOT
.81
(.032)
.81
WIDE X
DEEP
(.032)
Total Resistance Shift ............................................................................................ 10 ꢀ maximum
IP Rating........................................................................................................................................IP 40
TOLERANCES: EXCEPT WHERE NOTED
.51
(.02),
.127
(.005)
DECIMALS: .XX ±
FRACTIONS: ±1/64
.XXX ±
Mechanical Characteristics1
MM
(IN.)
Mechanical Angle ................................................................................................................Continuous
Torque (Starting & Running)............................................................0.18 N-cm (0.25 oz.-in.) maximum
Mounting.............................................................................170-200 N-cm (15-18 lb.-in.) maximum
Shaft Runout................................................................................................0.025 mm (0.001 in.) T.I.R.
Shaft End Play...............................................................................................0.13 mm (0.005 in.) T.I.R.
Shaft Radial Play ...........................................................................................0.08 mm (0.003 in.) T.I.R.
Backlash........................................................................................................................0.1 º maximum
Weight..........................................................................................................................................18 gm
Terminals.......................................................................................................................Rear turret type
Soldering Condition....................Recommended hand soldering using Sn95ꢁAg5 no clean solder,
0.025 ” wire diameter. Maximum temperature 399 °C (750 °F) for 3 seconds.
DIMENSIONS:
WIPER
2
CW
CCW
3
1
CLOCKWISE
No wash process to be used with no clean flux.
Marking ................................Manufacturer’s name and part number, resistance value and tolerance,
linearity tolerance, wiring diagram, and date code
Recommended Part Numbers
Ganging (Multiple Section Potentiometers).................................................................1 cup maximum
Hardware ...................................................One lockwasher (H-37-1) and one mounting unit (H-38-1)
is shipped with each potentiometer.
Resistance
Part Numbers
(Ω)
1At room ambient: +25 °C nominal and 50 % relative humidity, except as noted.
6638S-1-102
6638S-1-502
6638S-1-103
1,000
5,000
10,000
BOLDFACE LISTINGS ARE IN STOCK AND READILY
AVAILABLE THROUGH DISTRIBUTION.
FOR OTHER OPTIONS CONSULT FACTORY.
REV. 06/06
*RoHS Directive 2002/95/EC Jan 27 2003 including Annex
Specifications are subject to change without notice.
Customers should verify actual device performance in their specific applications.
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