PL
IA
Features
■
■
■
■
NT
7/8 ” (22 mm) diameter single-turn
conductive plastic
Bushing mount
Excellent resolution
High rotational life – ball bearing
shaft support
*R
oH
S
CO
M
■
Non-standard features and
specifications available
6638 - Precision Potentiometer
Electrical Characteristics
1
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)
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
Product Dimensions
6638
7/8 " (22 mm) DIA.
5.08
R
(.20)
3
2
CW
1
Environmental Characteristics
1
Operating Temperature Range...................................................................................+1 °C to +125 °C
Storage Temperature Range.....................................................................................-65 °C to +125 °C
Temperature Coefficient Over Storage Temperature Range ...........................±500 ppm/°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)
Total Resistance Shift ............................................................................................±10 % maximum
IP Rating ........................................................................................................................................IP 40
13.64
±
.38
(.537
±
.015)
1.57
(.062)
45
° ±
5
°
7.14 + .00/- .05
DIA.
(.281+.000/-.002)
1/4"-32 UNEF-THD
3.170 + .000/-.008
DIA.
(.1248+.0000/.0003)
.25
45
° ±
5° X (.010)
CHAMFER
22.23
(7/8)
DIA.
3.18
(1/8)
.38
(.015)
9.53
(3/8)
22.23
(7/8)
SHAFT SLOT
.81
.81
(.032) WIDE X (.032) DEEP
Mechanical Characteristics
1
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
Manual Soldering................................96.5Sn/3.0Ag/0.5Cu solid wire or no-clean rosin cored wire
370 °C (700 °F) max. for 3 seconds
Wave Soldering ........................................................96.5Sn/3.0Ag/0.5Cu solder with no-clean flux
260 °C (500 °F) max. for 5 seconds
Wash processes ..................................................................................................Not recommended
Marking ................................Manufacturer’s name and part number, resistance value and tolerance,
linearity tolerance, wiring diagram, and date code
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.
TOLERANCES: EXCEPT WHERE NOTED
.51
.127
DECIMALS: .XX
±
.XXX
±
(.02),
(.005)
FRACTIONS:
±1/64
MM
DIMENSIONS:
(IN.)
2
CCW
WIPER
1
CLOCKWISE
3
CW
Recommended Part Numbers
Part Numbers
6638S-1-102
6638S-1-502
6638S-1-103
Resistance
(Ω)
1,000
5,000
10,000
1
At room ambient: +25 °C nominal and 50 % relative humidity, except as noted.
BOLDFACE
LISTINGS ARE IN STOCK AND READILY
AVAILABLE THROUGH DISTRIBUTION.
FOR OTHER OPTIONS CONSULT FACTORY.
REV. 10/08
*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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