1
1-51 Model 68
ELECTRICAL
Standard Resistance Range, Ohms 10 to 2Meg
Standard Resistance Tolerance ±10% (<100 Ohms = ±20%)
Input Voltage, Maximum 200 Vdc or rms not to exceed power rating
Slider Current, Maximum 100mA or within rated power, whichever is less
Power Rating, Watts 0.5 at 85°C derating to 0 at 125°C
End Resistance, Maximum 2 Ohms
Actual Electrical Travel, Turns, Nominal 20
Dielectric Strength 900 Vrms
Insulation Resistance, Minimum 1,000 Megohms
Resolution Essentially infinite
Contact Resistance Variation, Maximum 1% or 1 Ohm, whichever is greater
ENVIRONMENTAL
Seal 85°C Fluorinert® (No Leaks)
Temperature Coefficient, Maximum ±100ppm/°C
Temperature Range –55°C to +125°C
Thermal Shock 5 cycles, –55°C to +125°C (1% ∆RT, 1% ∆VR)
Moisture Resistance Ten 24 hour cycles (1% ∆RT, IR 1,000 Megohms min.)
Shock, 6ms Sawtooth 100G’s (1% ∆RT, 1% ∆VR)
Vibration 20G’s, 10 to 2,000 Hz (1% ∆RT, 1% ∆VR)
High Temperature Exposure 250 hours at 125°C (2% ∆RT, 2% ∆VR)
Rotational Life 200 cycles (3% ∆RT)
Load Life at 0.5 Watts 1,000 hours at 70°C (2% ∆RT)
Resistance to Solder Heat 260°C for 10 sec. (1% ∆RT)
MECHANICAL
Mechanical Stops Clutch Action, both ends
Torque, Starting Maximum 5 oz.-in. (0.035 N-m)
Weight, Nominal .04 oz. (1.13 grams)
MODEL 68
3/8” Square
Multiturn
Cermet Trimming
Potentiometer
Fluorinert® is a registered trademark of 3M Company.
Specifications subject to change without notice.
Schematic Diagram
This Surface
Metal Adjustment Screw
.090/2.29 Dia. With
.020/0.51 Wide X
.025/0.64 Min. Depth
Max.
(1)
(2)
(3)
Meniscus
(Typ)
.19 ± .02
4.8 ± 0.5
.03
0.8
.245
6.22
Max.
.18
4.6
Min.
Terminal Pins (3)
Dia.
.020 ± .003
0.51 ± 0.08
Standard Marking
This Surface
Min.
Standoff .015 ± .002
0.38 ± 0.05
.187 ± .015
4.75 ± 0.38
.375 ± .015
9.53 ± 0.38
.12 ± .02
3.1 ± 0.5
(2)
(1)
(3)
.060 ± .015
1.524 ± 0.38
.10
2.5
.187 ± .015
4.75 ± 0.38
.10
2.5 .375 ± .015
9.53 ± 0.38
.10
2.5
TOP ADJUSTMENT (Inch/mm)
Schematic Diagram
This Surface
Max.
Standard Marking This Surface
.15 ± .02
3.8 ± 0.5
Metal Adjustment Screw
.090/2.29 Dia. With
.020/0.51 Wide X
.025/0.64 Min. Depth
.375 ± .015
9.53 ± 0.38
.062 ± .015
1.58 ± 0.38
.060 ± .015
1.52 ± 0.38
.12 ± .02
3.1 ± 0.5
.245
6.22
Terminal Pins (3)
Dia. (3) (2) (1)
Min.
.18
4.6
.015
0.38
.375 ± .015
9.53 ± 0.38
.020 ± .003
0.51 ± 0.08
.187 ± .015
4.75 ± 0.38
.045 ± .015
1.14 ± 0.38
.10
2.5
.10
2.5
Model 68W
SIDE ADJUSTMENT (Inch/mm)
Model 68
1-52
Model 68P
1
1-53 Model 68
CIRCUIT DIAGRAM
(1)
(2)
(3)
CW
NOTES
mm
INCH
Metric equivalents, based on 1 inch = 25.4mm are
rounded to the same number of significant figures
as in the original English units and are provided for
general information only.
Tolerances unless otherwise specified:
Linear = ± .01 inches (.25mm)
Angular = ± 2 degrees
SIDE ADJUSTMENT (Inch/mm)
Schematic Diagram This Surface
Standard Marking This Surface
Max.
.245
6.22
Metal Adjustment Screw
.090/2.29 Dia. With
.020/0.51 Wide X
.025/0.64 Min. Depth
.375 ± .015
9.53 ± 0.38
.15 ± .02
3.8 ± 0.5
Terminal Pins (3)
Dia. (3) (2) (1)
Min.
.32 ± .02
8.1 ± 0.5
.18
4.6
.375 ± .015
9.53 ± 0.38
.020 ± .003
0.51 ± 0.08
.060 ± .015
1.524 ± 0.38
.187 ± .015
4.75 ± 0.38
.045 ± .015
1.14 ± 0.38
.10
2.5
.10
2.5
Model 68X
STANDARD RESISTANCE VALUES, OHMS
10 200 5K 50K 500K
20 500 10K 100K 1Meg
50 1K 20K 200K 2Meg
100 2K 25K 250K
Model 68
1-54
PACKAGING
ORDERING INFORMATION
68 P R 10K LF
Model Series
Pin Style
RoHS Compliant Product Code - Optional
Resistance Value
Resistance Prefix
68 W R 10K LF TB
Pin Style Packaging Option:
TB = Tubes
(Pin styles P, W, X)
68 W F R 10K LF TR
Pin Style
Pin Style Suffix:
(Used with AP and TR packaging options.
Applicable to pin styles W & X only.
"F" designates 0.70" lead length.)
Packaging Option:
AP = Ammo pack
TR = Tape & Reel
(Pin styles W, X only)
Standard:
Option:
Standard: Boxes
Capacity = 100 Units (68W)
=50 Units (All other styles)
Option: Tubes
All units oriented with #1 pin to same side.
Pin Style P W X
Magazine Width = 0.57” 0.33” 0.33”
Height = 0.66” 0.90” 0.90”
Length = 20.9” 20.4” 24.4”
Capacity = 50 Units 50 Units 50 Units
Option: Tape & Reel, Ammo Pack (Available only for 68W and 68X)
All units oriented with #1 pin to the right of the direction of feed.
Seat Plane to
Centerline of
Sprocket Hole = .71” (18.03 mm)
Tape Width = 18 mm
Sprocket = Single Hole .50” spacing
Capacity = 1,000 Units
Reel Diameter = 14” (356 mm)
Ammo Tape Fold = 12” (305 mm)
Box = 1.8” x 13” x 10”
(46mm x 330mm x 254mm)
Option:
