1
1-71 Model 89
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 0.75 at 85°C derating to 0 at 125°C
End Resistance, Maximum 2 Ohms
Actual Electrical Travel, Turns, Nominal 20
Dielectric Strength 1,000 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
Operating 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 100 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 .05 oz. (1.4 grams)
MODEL 89
3/4” Rectangular
Multiturn
Cermet Trimming
Potentiometer
Fluorinert® is a registered trademark of 3M Company.
Specifications subject to change without notice.
Model 89
1-72
LOW PROFILE (Inch/mm)
.75
19.05
.20
5.08
.50
12.70
.015
0.381
Standoff
2 Places
Model No. And
Resistance Value
Marked On This
Or Opposite
Surface
.175
4.445
.060 ± .015
1.524 ± 0.381
.015 ± .005
0.381 ± 0.254
.125 ± .015
3.175 ± 0.381
.025 ± .005
0.635 ± 0.127 Wide X
Min.
Deep Slot
.185 ± .015
4.669 ± 0.381
(3)(2)(1)
.031 ± .005
0.787 ± 0.127
Metal Adjustment Screw: Dia. With
.093 ± .01
2.36 ± 0.25
.25
6.35
C
L
.19
4.83
Solderable
Terminal Pins (3)
.10
2.54
.021 ± .003
0.533 ± 0.076
.050 ± .015
1.270 ± 0.381
Dia.
Typ.
Model 89P and 90P
.20
5.08
.50
12.70
.20
5.08
.125 ± .015
3.175 ± 0.381
.100 ± .015
2.540 ± 0.381
(3)(2)(1)
Model 89W
.30
7.62
0.25
0.635
.70
17.78
(3)(2)(1)
.10
2.54
.050 ± .015
1.270 ± 0.381
Model 89X
Model 89P dimensions applicable to all other models except as noted.
Pin Dimensions Same For 89X And 89XH
.34
8.64
.275
6.985
(3)(2)(1)
.03
0.76
.02
0.51
Standoff
2 Places
1
1-73 Model 89
HIGH PROFILE (Inch/mm)
Pin Dimensions Same For 89P And 89PH
.34
8.64
.275
6.985
(3)(2)(1)
.03
0.76
.02
0.51
Standoff
2 Places
Housing:
Molded Plastic
(All Models)
Circuit Diagram Marked
On This Surface
Model 89PH
Model 89XH
Pin Dimensions Same For 89W And 89WH
.34
8.64
.275
6.985
(3)(2)(1)
.03
0.76
.02
0.51
Standoff
2 Places
Model 89WH
PACKAGING
Standard: Boxes
Capacity = 100 Units (89P)
50 Units (All other styles)
Option: Tubes (Models 89P, 89PH, 89X, 89XH and 90P only.)
All units oriented with #1 pin to same side.
Magazine Width = 0.28”
Height = 0.65”
Length = 21.5”
Capacity = 25 Units
Model 89
1-74
.30 ± .01
7.62 ± 0.25
.91 ± .01
23.11 ± 0.25
Circuit Diagram
Marked On This
Surface
Material:
Molded
Plastic 5/16-32 UNEF Thread
.375 ± .010
9.525 ± 0.254
.155
2.921
Screwdriver Hole
Dia. Min.
.375 ± .010
9.525 ± 0.254
.187 ± .010
4.750 ± 0.254
.187 ± .010
4.750 ± 0.254
Model 89B
PANEL MOUNT ADAPTER (Inch/mm)
STANDARD RESISTANCE VALUES, OHMS
10 200 5K 50K 500K
20 500 10K 100K 1Meg
50 1K 20K 200K 2Meg
100 2K 25K 250K
1
1-75 Model 89
ORDERING INFORMATION
89 P R 10K
Model Series
(Use Model 90 to order
with transparent housing)
Pin Style
Resistance Value
Resistance Prefix
89 P R 10K TB
Pin Style Packaging Option:
TB = Tubes
(Models 89P, 89PH, 89X, 89H, 90P Only.)
89 P B R 10K
Pin Style Panel Mount Adapter
(Use 89B to order
Adapter without
Trimmer)
Standard:
Option:
Option:
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
