BOURNS 3680 Service Manual
*RoHS Directive 2002/95/EC Jan 27 2003 including Annex
Specifications are subject to change without notice.
Customers should verify actual device performance in their specific applications.
3680 Family - Precision Potentiometer
Features
■ Repeatable settings
■ Resolution to 0.001 %
■ Digital display provides excellent
readability
■ Snap-in panel mount
Electrical Characteristics
1
Standard Resistance Range .............................................................................10 ohms to 1 megohm
Total Resistance Tolerance ...........................................................................................................±3 %
Dielectric Withstanding Voltage (MIL-STD-202, Method 301)
Sea Level ..........................................................................................................1,000 VAC minimum
Power Rating (Voltage Limited By Power Dissipation or 500 VAC, Whichever is Less)
+25 °C ...................................................................................................................................2 watts
+85 °C......................................................................................................................................0 watt
Insulation Resistance (500 VDC)..................................................................1,000 megohms minimum
Resolution
3681 ..........................................................................................................................................10 %
3682 ............................................................................................................................................1 %
3683 .........................................................................................................................................0.1 %
3684 .......................................................................................................................................0.01 %
3685 .....................................................................................................................................0.001 %
Absolute Minimum Resistance...............................3 ohms or 0.2 % maximum (whichever is greater)
Accuracy (Dial Reading to Output Ratio)....................................................................±1.0 % full scale
Environmental Characteristics
1
Operating Temperature Range ...................................................................................-25 °C to +85 °C
Storage Temperature Range.......................................................................................-25 °C to +85 °C
Temperature Coefficient Over Storage Temperature Range...........................±100 ppm/°C maximum
Vibration .........................................................................................................................................10 G
Wiper Bounce...........................................................................................0.1 millisecond maximum
Total Resistance Shift ..............................................................................................±1 % maximum
Voltage Ratio Shift ................................................................................................±0.2 % maximum
Shock .............................................................................................................................................50 G
Wiper Bounce...........................................................................................0.1 millisecond maximum
Total Resistance Shift ..............................................................................................±1 % maximum
Voltage Ratio Shift ................................................................................................±0.2 % maximum
Load Life ...............................................................................................................1,000 hours, 2 watts
Total Resistance Shift ..............................................................................................±2 % maximum
Rotational Life .........................................................................75,000 button operations each decade
Total Resistance Shift ..............................................................................................±2 % maximum
IP Rating ........................................................................................................................................IP 40
Mechanical Characteristics
1
Weight....................................3681 (9 gm); 3682 (16 gm); 3683 (23 gm); 3684 (30 gm); 3685 (37 gm)
Terminals.....2.79 mm (0.11 in.) wide x .41 mm (.016 in.) thick, tinned solder lugs for 3 #20 AWG wires
Soldering Condition........................Recommended hand soldering using Sn95/Ag5 no clean solder,
0.025 ” wire diameter. Maximum temperature 399 °C (750 °F) for 3 seconds.
No wash process to be used with no clean flux.
Marking...............................Manufacturer’s name and part number, resistance value and date code.
Ganging (Multiple Section Potentiometers) ...............................................Up to 5 decades maximum
Readout Marking ........................................................................................................10 positions, 0-9
Actuating Force...................................................................................19 to 29 oz. on detent decades
Actuating Force Variation..............................................................................................4 oz. maximum
1
At room ambient: +25 °C nominal and 50 % relative humidity nominal, except as noted.
NOTE: Terminals 1 & 3 are reversed from illustration for models 3682 and 3684.
3680
7.77 ± .38
(.306 ± .015)
1 2 3
2
3
1
a
c d
b
PANEL
e
8.38 ± .38
(.33 ± .015)
1
3
INCR.
2
WIPER
7.87
(.31)
20.57
(.810)
23.62
(.93)
3.18
(.125)
MIN.
.81
(.032)
MAX.
3.18
(.125)
26.67
(1.050)
TOLERANCES: EXCEPT WHERE NOTED
.38 .13
DECIMALS: .XX ±
(.015)
.XXX ±
(.005)
FRACTIONS: ±1/64
MM
DIMENSIONS:
(IN.)
Product Dimensions
Product Dimensions
Dimensions Weight (Approx.)
Model
a b c d e –.381 (–.015) oz. gms.
3681 16.51 (.650) 14.99 (.590) — 9.91 (.39) 4.19 (.165) .336 9.5
3682 26.67 (1.05) 25.15 (.99) 10.67 (.42) 11.94 (.47) 8.38 (.330) .576 16.5
3683 37.08 (1.46) 35.31 (1.39) 18.54 (.73) 11.94 (.47) 4.19 (.165) .824 23.5
3684 47.50 (1.87) 45.47 (1.79) 30.73 (1.21) 11.94 (.47) 8.38 (.330) 1.072 30.5
3685 57.66 (2.270) 55.63 (2.190) 39.12 (1.540) 11.94 (.47) 4.19 (.165) 1.320 37.5
Dimensions
Model
f –.010 (–.254) g –.010 (–.254)
3681 21.08 (.830) 15.75 (.620)
3682 21.08 (.830) 25.91 (1.020)
3683 21.08 (.830) 36.07 (1.420)
3684 21.08 (.830) 46.23 (1.820)
3685 21.08 (.830) 56.39 (2.220)
RECOMMENDED
PANEL CUTOUT
f
g
.76
(.03)
R MAX.
*RoHS COMPLIANT
VERSIONS
AVAILABLE
Specifications are subject to change without notice.
Customers should verify actual device performance in their specific applications.
3680 Family - Precision Potentiometer
Resistance
3681S-1 3682S-1 3683S-1 3684S-1 3685S-1
(Ω)
123 45
Decade Decade Decade Decade Decade
50 -500L
100 -101L
200 -201L
500 -501L -501L
1,000 -102L -102L -102L
2,000 -202L -202L -202L
5,000 -502L -502L -502L
10 K -103L -103L -103L -103L
20 K -203L -203L -203L
50 K -503L -503L -503L
100 K -104L -104L -104L -104L -104L
500 K -504L -504L -504L
1 Meg -105L -105L -105L -105L
Recommended Part Numbers
BOLDFACE LISTINGS ARE IN STOCK AND READILY
AVAILABLE THROUGH DISTRIBUTION.
FOR OTHER OPTIONS CONSULT FACTORY.
TERMINALS:
L = RoHS COMPLIANT
BLANK = STANDARD
REV. 06/06
Loading...