鈻?/div>
Non-standard features and
specifications available
6638 - Precision Potentiometer
Electrical Characteristics
1
Standard Resistance Range....................................................................................1 K to 100 K ohms
Total Resistance Tolerance .........................................................................................................鹵10 %
Independent Linearity ...................................................................................................................鹵1 %
Effective Electrical Angle .......................................................................................................340 擄 鹵3 擄
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 擄C......................................................................................................................................1 watt
+125 擄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 擄C to +125 擄C
Storage Temperature Range.....................................................................................-65 擄C to +125 擄C
Temperature Coefficient Over Storage Temperature Range ...........................鹵500 ppm/擄C maximum
Vibration .........................................................................................................................................15 G
Wiper Bounce ...........................................................................................0.1 millisecond maximum
Total Resistance Shift ..............................................................................................鹵5 % maximum
Voltage Ratio Shift ................................................................................................鹵0.5 % maximum
Shock .............................................................................................................................................50 G
Wiper Bounce ...........................................................................................0.1 millisecond maximum
Total Resistance Shift ..............................................................................................鹵5 % maximum
Voltage Ratio Shift ................................................................................................鹵0.5 % maximum
Load Life .................................................................................................................1,000 hours, 1 watt
Total Resistance Shift ............................................................................................鹵10 % maximum
Rotational Life (No Load) .........................................................................20,000,000 shaft revolutions
Total Resistance Shift ............................................................................................鹵10 % maximum
Moisture Resistance (MIL-STD-202, Method 106)
Total Resistance Shift ............................................................................................鹵10 % maximum
IP Rating ........................................................................................................................................IP 40
13.64
鹵
.38
(.537
鹵
.015)
1.57
(.062)
45
擄 鹵
5
擄
7.14 + .00/- .05
DIA.
(.281+.000/-.002)
1/4"-32 UNEF-THD
3.170 + .000/-.008
DIA.
(.1248+.0000/.0003)
.25
45
擄 鹵
5擄 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 潞 maximum
Weight ..........................................................................................................................................18 gm
Terminals.......................................................................................................................Rear turret type
Soldering Condition....................Recommended hand soldering using Sn95/Ag5 no clean solder,
0.025 鈥?wire diameter. Maximum temperature 399 擄C (750 擄F) for 3 seconds.
No wash process to be used with no clean flux.
Marking ................................Manufacturer鈥檚 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.
1
TOLERANCES: EXCEPT WHERE NOTED
.51
.127
DECIMALS: .XX
鹵
.XXX
鹵
(.02),
(.005)
FRACTIONS:
鹵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
(鈩?
1,000
5,000
10,000
At room ambient: +25 擄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. 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.
1
