Features
■ Multiturn/ 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
3290W/RT24/RTR24
Electrical Characteristics
Physical Characteristics (cont.)
2.54
Standard Resistance Range
Marking
(.100)
3
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)
3290 ................Manufacturer’s trademark,
2
resistance code, wiring diagram,
date code, manufacturer’s model
1
number and style
2.54
1.19
RT24/RTR24 ...........Mil-spec part number
(.100)
(.075)
Wiper................Positioned at 50% nominal
Absolute Minimum Resistance
..................................0.1% or 1 ohm max.
(whichever is greater)
Flammability...............................U.L. 94V-0
Standard Packaging .........50 pcs. per tube
Adjustment Tool ..................................H-90
WIPER
2
Noise ..........................100 ohms ENR max.
Resolution
.................(see standard resistance table)
Insulation Resistance ....................500 vdc.
1,000 megohms min.
How to Order
CW
CCW
3
1
CLOCKWISE
3290 H - 1 - 103 M
Model
Style
Dielectric Strength
TOLERANCES: ± 0.25 (.010) EXCEPT WHERE NOTED
Sea Level ...................................1,000 vac
80,000 Feet...................................350 vac
Adjustment Travel .................25 turns nom.
METRIC
(INCHES)
Standard or Modified
Product Indicator
DIMENSIONS ARE:
-1 = Standard Product
Environmental Characteristics
Resistance Code
Optional Suffix Letter
Power Rating @ 85°C
M = Panel Mount
(Factory Installed)
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
Standard Resistance Table
Nominal
Resolution
(Percent)
Resistance
(Ohms)
Resistance
Code
See page 81 for RT24/RTR24 ordering
information.
Consult factory for other available options.
10
20
100
200
500
101
201
501
1.11
0.93
0.62
0.60
0.54
0.42
50
100
200
500
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)
3290H/RT24X/RTR24X
Common Dimensions
1,000
2,000
102
202
502
103
203
253
503
0.33
0.26
0.20
0.17
0.14
0.13
0.11
1.02
(.040)
3.81
1.27*
(.050)
(.150)
9.53 ± .38
*
5,000
(.375 ± .015)
10,000
20,000
25,000
50,000
9.53 ± .38
1.52
(.060)
*
*
(.375 ± .015)
3
2 1
8.00 ± .38
(.315 ± .015)
Popular values listed in boldface. Special
resistances available.
.51 ± .03
(.020 ± .001)
TYP.
*
SHADED AREAS TYPICALLY NOT STOCKED BY
DISTRIBUTORS AND NOT RECOMMENDED FOR NEW
DESIGNS.
1.91
(.075)
DIA. TYP.
*
ADJ. SLOT
2.54
(.100)
1.52
(.060)
.51
(.020)
.64
DIA.
2.54
(.100)
4.75
(.187)
WIDE
DEEP
X
X
(.025)
Rotational Life ............................200 cycles
3290 .................(2% ∆TR; 500 ohms ENR)
RT24/RTR24...............................(2% ∆TR)
3290P/RT24/RTR24
4.75
(.187)
1
Physical Characteristics
2
3
4.75
(.187)
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
2.54
(.100)
(.100)
2.54
(.100)
Common dimensions
*
*”FLUORINERT” IS A REGISTERED TRADEMARK OF 3M CO.
Specifications are subject to change without notice.
24
BOURNS [ BOURNS ELECTRONIC SOLUTIONS ]
