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