Features
■ Multiturn / Wirewound / Industrial /
Sealed
■ Listed on the QPL for style RT26 per
MIL-R-27208
3260/RT26 - 1/4” Square Trimming Potentiometer
Electrical Characteristics
Physical Characteristics
3260W/RT26
1.27
(.050)
Standard Resistance Range
Torque..................................3.0 oz-in. max.
3260 .................................10 to 25K ohms
RT26 ..................................10 to 5K ohms
(see standard resistance table)
Mechanical Stops......................Wiper idles
Terminals
3260 ..........Solderable printed circuit pins
1
2
3
Resistance Tolerance ...................±5% std.
(tighter tolerance available)
Absolute Minimum Resistance
RT26...............MIL-STD-202; Method 208
Weight ..........................................0.015 oz.
Marking
6.35 ± .51
(.250 ± .020)
4.32 ± .38
1.27
(.050)
(.170 ± .015)
3260..........................0.1% or 1 ohm max.
(whichever is greater)
3260 ................Manufacturer’s trademark,
resistance code, wiring diagram,
RT26 .......................0.25% or 1 ohm max.
(whichever is greater)
date code, manufacturer’s model
number and style
.89
(.035)
Noise ..........................100 ohms ENR max.
Resolution...................See resistance table
Insulation Resistance ....................500 vdc.
.................................1,000 megohms min.
Dielectric Strength
Sea Level ......................................600 vac
80,000 Feet...................................250 vac
Adjustment Angle..................11 turns nom.
RT26 .......................Mil-spec part number
Wiper ...................................Set at CW end
Flammability.................................UL 94V-0
Standard Packaging .........50 pcs. per tube
Adjustment Tool ..................................H-90
WIPER
2
How To Order
CW
CCW
3
1
CLOCKWISE
3260 H - 1 - 502
Model
Style
Environmental Characteristics
TOLERANCES: ± 0.25 (.010) EXCEPT WHERE NOTED
Power Rating
85°C ...........................................0.25 watt
150°C ..............................................0 watt
Temperature Range
3260................................-65°C to +150°C
RT26 ...............................-55°C to +150°C
Temperature Coefficient
Standard or Modified
Product Indicator
METRIC
(INCHES)
DIMENSIONS ARE:
-1 = Standard Product
Resistance Code
See page 81 for RT26 ordering information.
Consult factory for other available options.
Standard Resistance Table
3260........................................±70ppm/°C
RT26 .......................................±50ppm/°C
Seal Test ............................85°C Fluorinert*
Humidity............MIL-STD-202 Method 106
3260..............(2% ∆TR, 100 Megohms IR)
RT26 ...............(1% ∆TR, 10 Megohms IR)
Vibration
3260.............................30G (1% ∆TR; 1%
+ resolution ∆VR)
RT26 ............................20G (1% ∆TR; 1%
+ resolution ∆VR)
Nominal
3260H/RT26 "X" Style
Common Dimensions
Resistance
(Ohms)
Resistance
Code
Resolution
(Percent)
10
20
50
100
200
500
1,000
2,000
5,000
10,000
20,000
25,000
100
200
500
101
201
501
102
202
502
103
203
1.90
1.50
1.23
1.00
0.94
0.58
0.50
0.45
0.34
0.29
0.28
6.35 ± .51
(.250 ± .020)
.89
(.035)
1
2 3
6.35 ± .51
(.250 ± .020)
4.78 ± .38
(.188 ± .015)
Shock .................................................100G
(1% ∆TR; 1% + resolution ∆VR)
.76
(.030)
2.54
(.100)
253
0.23
Popular values listed in boldface. Special
resistances available.
2.54
(.100)
Load Life ....1,000 hours 0.25 watt @ 85°C
3260 .................(2% ∆TR; 500 ohms ENR)
RT26 ......(2% ∆TR; 2% + resolution ∆VR)
Rotational Life ............................200 cycles
3260 .................(2% ∆TR; 500 ohms ENR)
RT26...........................................(2% ∆TR)
1.02 ± .38
(.040 ± .015)
SHADED AREAS TYPICALLY NOT STOCKED BY
DISTRIBUTORS AND NOT RECOMMENDED FOR NEW
DESIGNS.
2.54
(.100)
4.32 ± .38
(.170 ± .015)
1.27
(.050)
1.27
(.050)
ADJ. SLOT
1.78
(.070)
DIA.
.41 ± .03
DIA.
.51
(.020)
(.016 ± .001)
WIDE
X
X
.51
DEEP
(.020)
*”FLUORINERT” IS A REGISTERED TRADEMARK OF 3M CO.
Specifications are subject to change without notice.
18
BOURNS [ BOURNS ELECTRONIC SOLUTIONS ]
