AV
DI TH AIL
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Features
s
Multiturn/
s
s
Wirewound / Industrial / Sealed
Listed on the QPL for style RT24 per
MIL-R-27208 and RTR24 per
High-Rel MIL-R-39015
Panel mount option available
(see page 73 for details)
3290/RT24/RTR24 - 3/8” Square Trimming Potentiometer
Electrical Characteristics
Standard Resistance Range
3290.................................10 to 50K ohms
RT24 ................................10 to 10K ohms
RTR24 ............................500 to 10K ohms
(see standard resistance table)
Resistance Tolerance ...................±5% std.
(tighter tolerance available)
Absolute Minimum Resistance
..................................0.1% or 1 ohm max.
(whichever is greater)
Noise ..........................100 ohms ENR max.
Resolution
.................(see standard resistance table)
Insulation Resistance ....................500 vdc.
1,000 megohms min.
Dielectric Strength
Sea Level ...................................1,000 vac
80,000 Feet...................................350 vac
Adjustment Travel .................25 turns nom.
Physical Characteristics (cont.)
Marking
3290 ................Manufacturer’s trademark,
resistance code, wiring diagram,
date code, manufacturer’s model
number and style
RT24/RTR24 ...........Mil-spec part number
Wiper................Positioned at 50% nominal
Flammability ...............................U.L. 94V-0
Standard Packaging .........50 pcs. per tube
Adjustment Tool ..................................H-90
3290W/RT24/RTR24
3
2
1
1.19
(.075)
2.54
(.100)
2.54
(.100)
2
CCW
WIPER
How to Order
1
CLOCKWISE
3
CW
3290 H - 1 - 103 M
Model
Style
Standard or Modified
Product Indicator
-1 = Standard Product
Resistance Code
Optional Suffix Letter
M = Panel Mount
(Factory Installed)
See page 81 for RT24/RTR24 ordering
information.
Consult factory for other available options.
TOLERANCES: ± 0.25 (.010) EXCEPT WHERE NOTED
DIMENSIONS ARE:
METRIC
(INCHES)
Environmental Characteristics
Power Rating @ 85°C
3290 .............................................1.0 watt
RT24/RTR24...............................0.75 watt
Power Rating @ 150°C......................0 watt
Temperature Range ..........-65°C to +150°C
Temperature Coefficient ...........±50ppm/°C
Seal Test ............................85°C Fluorinert*
Humidity
3290 ................MIL-STD-202 Method 106
96 hours (2%
∆TR;
100 Megohms IR)
RT24 ...............(1%
∆TR;
10 Megohms IR)
RTR24...........(1%
∆TR;
100 Megohms IR)
Vibration
3290....................................................30G
(1%
∆TR;
0.5% + resolution
∆VR)
RT24/RTR24 .......................................20G
(1%
∆TR;
0.5% + resolution
∆VR)
Shock .................................................100G
(1%
∆TR;
0.5% + resolution
∆VR)
Load Life
3290 ...........1,000 hours 1.0 watt @ 85°C
(2%
∆TR;
500 ohms ENR)
RT24 .........1,000 hours 0.75 watt @ 85°C
(2%
∆TR;
2% + resolution
∆VR)
RTR24.....10,000 hours 0.75 watt @ 85°C
(3% + resolution
∆VR)
Rotational Life ............................200 cycles
3290 .................(2%
∆TR;
500 ohms ENR)
RT24/RTR24...............................(2%
∆TR)
Standard Resistance Table
Resistance
(Ohms)
10
20
50
100
200
500
1,000
2,000
5,000
10,000
20,000
25,000
50,000
Resistance
Code
100
200
500
101
201
501
102
202
502
103
203
253
503
Nominal
Resolution
(Percent)
1.11
0.93
0.62
0.60
0.54
0.42
0.33
0.26
0.20
0.17
0.14
0.13
0.11
3290H/RT24X/RTR24X
Common Dimensions
3.81
(.150)
1.27*
(.050)
1.52
*
(.060)
3 2 1
8.00
±
.38
(.315
±
.015)
TYP.*
1.91
(.075)
2.54
(.100)
4.75
(.187)
.51
±
.03
(.020
±
.001)
DIA. TYP.*
2.54
(.100)
1.02
(.040)
9.53
±
.38
*
(.375
±
.015)
9.53
±
.38*
(.375
±
.015)
Popular values listed in boldface. Special
resistances available.
SHADED AREAS TYPICALLY NOT STOCKED BY
DISTRIBUTORS AND NOT RECOMMENDED FOR NEW
DESIGNS.
ADJ. SLOT
1.52 DIA.
(.060)
.51
WIDE
X
(.020)
.64
DEEP
X
(.025)
3290P/RT24/RTR24
4.75
(.187)
1
4.75
(.187)
2.54
(.100)
2.54
(.100)
2
3
Physical Characteristics
Torque..................................5.0 oz-in. max.
Mechanical Stops......................Wiper idles
Terminals
3290 ..........Solderable printed circuit pins
RT24/RTR24...MIL-STD-202; Method 208
Weight ..........................................0.025 oz.
2.54
(.100)
*
Common dimensions
*”FLUORINERT” IS A REGISTERED TRADEMARK OF 3M CO.
24
Specifications are subject to change without notice.
BOURNS [ BOURNS ELECTRONIC SOLUTIONS ]
