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Specifications are subject to change without notice.
228
3851/3852/3856 - 3/4” Diameter Panel Control
FOR ORDERING INFORMATION SEE PAGE 229.
Initial Electrical Characteristics
1
3851
Conductive Plastic Element
3852/3856
Cermet Element
Standard Resistance Range
Linear Tapers (A, B, E, and H)..................................1K to 1 megohm ......................................................100 ohms to 1 megohm
Audio Tapers (C, D, F, and G) ..................................1K to 1 megohm ......................................................1K ohms to 1 megohm
Resistance Tolerance..................................................±20% ........................................................................±10%
Zero Base Linearity ....................................................(B, D, & G tapers) ±20% ..........................................(A, C, & F tapers) ±10%
(E taper) ±10%
Independent Linearity ................................................±10% ........................................................................(A & H tapers) ±5%
Absolute Minimum Resistance ..................................2 ohms maximum .................................................... 2 ohms maximum
Continuity....................................................................Maintained for full mechanical angle........................Maintained for full mechanical angle
Effective Electrical Angle ............................................250° ±5°....................................................................250° ±5°
Contact Resistance Variation......................................±1% ..........................................................................±3% of total resistance or 3 ohms
(H taper) ±5%
(whichever is greater)
Dielectric Withstanding Voltage..................................MIL-STD-202, Method 301 ......................................MIL-STD-202, Method 301
Sea Level ................................................................900 VAC minimum....................................................900 VAC minimum
70,000 Feet..............................................................350 VAC minimum....................................................350 VAC minimum
Insulation Resistance (500 VDC) ................................1,000 megohms minimum........................................1,000 megohms minimum
Power Rating (Voltage Limited By Power
Dissipation or 316 VAC, Whichever Is Less)
+70°C ......................................................................(B & E tapers) 1 watt ................................................(A & H tapers) 2 watts
(D & G tapers) 0.5 watt..............................................(C & F tapers) 1 watt
+125°C ....................................................................0 watt
+150°C ......................................................................................................................................................0 watt
Theoretical Resolution................................................Essentially infinite......................................................Essentially infinite
Environmental Characteristics
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Operating Temperature..................................................................................................................................-1°C to +125°C
Storage Temperature Range ......................................-65°C to +125°C ......................................................-65°C to +150°C
Temperature Coefficient
Over Storage Temperature Range..............................±1,000PPM/°C ..........................................................±150PPM/°C
Vibration ....................................................................20G ..........................................................................20G
Total Resistance Shift ..............................................±2% maximum ........................................................±2% maximum
Voltage Ratio Shift ..................................................±5% maximum ........................................................±6% maximum
Shock ........................................................................100G ........................................................................100G
Total Resistance Shift ..............................................±2% maximum ........................................................±2% maximum
Voltage Ratio Shift ..................................................±5% maximum ........................................................±6% maximum
Load Life ....................................................................1,000 hours ..............................................................1,000 hours
Total Resistance Shift ..............................................±10% maximum ......................................................±3% maximum
Rotational Life (No Load)............................................100,000 cycles..........................................................50,000 cycles
Total Resistance Shift ..............................................±15% maximum ......................................................±5% or 5 ohms (whichever is greater)
Moisture Resistance ..................................................MIL-STD-202, Method 103, Condition B..................MIL-STD-202, Method 103, Condition B
Total Resistance Shift ..............................................±10% maximum ......................................................±2% maximum
Insulation Resistance (500 VDC)..............................100 megohms minimum ..........................................100 megohms minimum
Mechanical Characteristics
1
Shaft Torque................................................................(A & B bushings) .05 to 6.0 oz.-in. ............................3852 (A & B bushings) 0.5 to 6.0 oz.-in.
(0.35 to 4.23 Ncm)
(C & E bushings) 0.3 to 6.0 oz.-in.
(0.21 to 4.23 Ncm)
(0.35 to 4.23 Ncm)
(C & E bushings) 0.3 to 6.0 oz.-in.
(0.21 to 4.23 Ncm)
3856 — 0.15 to 3.0 oz.-in.
(0.11 to 2.12 Ncm)
Stop Strength..............................................................5 in.-lb. (56.5 Ncm) ..................................................5 in.-lb. (56.5 Ncm)
Mechanical Angle ......................................................280° ±5°....................................................................3852 — 280° ±5
3856 — 1350° ±50°
Weight ........................................................................30 grams maximum..................................................30 grams maximum
Terminals ....................................................................Printed circuit terminals or solder lugs ....................Printed circuit terminals or solder lugs
Marking ......................................................................Manufacturer’s trademark, wiring diagram,..............Manufacturer’s trademark, wiring diagram,
date code, resistance, manufacturer’s
part number
date code, resistance, manufacturer’s
part number
1
AT ROOM AMBIENT: +25°C NOMINAL AND 50% RELATIVE HUMIDITY NOMINAL, EXCEPT AS NOTED.
Features
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Single-turn (3851 and 3852)
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Linear and audio tapers
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3-3/4-turn (3856)
I
Wide resistance range
I
Minimal depth package
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Good resolution