Toroidal rheostats and potentiometer model 718

· Power: 3 W
· Dimensions: 15 (Æ 36.5 mm)
· Resistive support for winding wire in plastic case
· 2 versions: S Standard / LL Long Life
· Other special versions are available on request

ELECTRICAL CHARACTERISTICS

· Range of ohm values from 1R0 to 100K
· Ohm value tolerance model 718 LL G (± 2 %), limited: F (± 1 %)
· Model 718 S J (± 5 %), limited: F (± 1 %)
· Independent linearity model 718 LL: ± 0.15 %
· Model 718 S: ± 0.4 %
· Angle of electric rotation standard: 340° ± 2°
· Available on request: 270° / 280° / 300° / 320° / 330° / 350° ± 2° and 357° - 358° or 359° with a short-circuit area
· Residual resistance model 718 LL: 0.1 %, minimum 0.5 W
· Model 718 S: 0.1 %, minimum 1 W
· Contact noise max.: 100 W ENR
· Power nominal: 3 W, otherwise according to the load reduction curve
· Multiple versions: 2.5 W / Section
· Insulation resistance: > 1000 MW a 500 VDC / 1 minute
· Electric rigidity: 1000 V AC / 50 Hz / 1 minute, at 1 bar
· Temperature coefficient of resistive wire: ≤ 50R = ± 20 ppm / °C, > 50R = ± 10 ppm / °C

MECHANICAL/PHYSICAL CHARACTERISTICS

· Angle of mechanical rotation: rotation capacity (360°) or in conformity with angle of electric rotation, with stoppage +4°/-0°
· Useful life model 718 LL: 1×106cycles at 40 U/min
· Model 718 S: 0.5×106cycles at 40 U/min
· Tested at room temperature, potentiometer without load
· Static torque standard: 0.4 Ncm, on request: 1.5 - 3 Ncm
· Operating torque standard: 0.2 Ncm, on request: 1.5 - 3 Ncm (+100% for each additional section)
· Tightening torque 340°: > 100 Ncm, other angles: > 50Ncm
· Ball bearing model 718 LL: 2 precision ball bearings
· Model 718 S: thrust bearing
· Terminals gold plated brass
· Assembly max. 5 sections, phase movement ± 0.5°
· Weight :20 g (standard model)
· Range of operating temperature: - 55 °C to + 125 °C
· Vibration test: 20 g from 10 to 2’000 Hz
· Test with saline spray 96 h without corrosion
· Humidity test (on request) 96 h at 80 up to 98 % Relative Humidity


 
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