Series 3850—3/4" Diameter Panel Control
Single-Turn or 3-3/4-Turn |
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| Features: |
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Conductive Plastic or Cermet element |
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Single Turn or 3 3/4 Turn Controls |
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Linear and Audio Tapers |
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RoHS compliant version available
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Series
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Model 3851
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Conductive Plastic 3/4" Dia. Single-Turn |
Model 3852
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Cermet 3/4" Dia. Single-Turn Control |
Model 3856
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Cermet 3/4" Dia. 3-3/4-Turn Control |
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Electrical Specifications
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Resistance
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Conductive Plastic: 1K ohms to 1.0M ohms
Cermet Linear Taper: 100 ohms to 1.0M ohms
Cermet Linear Taper: 1K ohms to 1.0M ohms
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Resistance Tolerance
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Conductive Plastic: ±10% or ±20%
Cermet: ±5% or ±10%
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Independent Linearity
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Conductive Plastic: ±10%
Cermet: ±5% |
Absolute Minimum Resistance
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2 ohms maximum |
Effective Electrical Angle
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250° ±5°
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Contact Resistance Variation
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Conductive Plastic: ±1%
Cermet: ±3% of Total Resistance or 3 ohms
(whichever is greater)
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Dielectric Withstanding Voltage
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Sea Level: 900 VAC minimum
70,000 Feet: 350 VAC minimum
(MIL-STD-202—Method 301)
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| Insulation Resistance |
1,000 megohms minimum (500VDC)
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Power Rating @ 70°C
(Voltage Limited By Power Dissipation or 200 VAC, whichever is less) |
Conductive Plastic: +70° (Linear): 1 watt; +70° (Audio): 0.5 watt; +125°: 0 watt
Cermet: +70° (Linear): 2 watts;
+70° (Audio): 1 watt; +150°: 0 watt
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Theoretical Resolution
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Essentially infinite
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Mechanical Specifications
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Mechanical Angle
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280° ±5°
3856: 1350° ±50° |
Stop Strength
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3851 & 3852: 56.5 N-cm (5 lb.-in.)
3856: Continuous turn |
Starting and Running Torque
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3/8" Bushings: 0.05 to 6.0 oz.-in.
1/4" Bushings: 0.3 to 6.0 oz.-in.
3856: 0.15 to 3.0 oz.-in. |
Mounting (Torque on Bushing)
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1.7-2.0 N-m (15-18 lb.-in.) maximum |
Weight
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30 grams maximum |
Terminals
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Printed circuit terminals or solder lugs |
Soldering Condition
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Recommended hand soldering using Sn85/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.
Part can be wave soldered at 260°C (500°F) for 5 seconds. No wash process with no clean flux. |
Marking
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Manufacturer’s trademark, wiring diagram, date code,
resistance, manufacturer’s part number |
Ganging
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1 module maximum |
Hardware
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One lockwasher and one mounting nut is shipped with each potentiometer,
except where noted in the part number. |
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Environmental Specifications
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Operating Temperature Range
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-1°C to +125°C |
Storage Temperature Range
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Conductive Plastic: -65°C to +125°C
Cermet: -65°C to +150°C |
| Temperature Coefficient |
Conductive Plastic: ±1000 ppm/°C
Cermet: ±150 ppm/°C
over Storage Temperature Range |
Vibration—20 G
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Total Resistance Shift: ±2% maximum
Voltage Ratio Shift:
Conductive Plastic: ±5% maximum
Cermet: ±6% maximum |
Shock—100 G
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Total Resistance Shift: ±2% maximum
Voltage Ratio Shift:
Conductive Plastic: ±5% maximum
Cermet: ±6% maximum |
Load Life—1,000 Hours
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Total Resistance Shift:
Conductive Plastic: ±10% maximum
Cermet: ±3% maximum |
Rotational Life (No Load)
Conductive Plastic |
100,000 cycles
Total Resistance Shift: ±15% TRS maximum
Contact Resistance Variation:±3% |
Rotational Life (No Load)
Cermet |
50,000 cycles
Total Resistance Shift: ±5% or 5 ohms TRS
(whichever is greater)
Contact Resistance Variation:±3% |
Moisture Resistance
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Total Resistance Shift: ±2% TRS maximum
Insulation Resistance (500 VDC):
100 megohms minimum
MIL-STD-202, Method 103, Condition B |
Salt Spray
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MIL-STD-202, Method 101, Condition A |
IP Rating
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IP40 |
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