FHR 2-3025 2-3818 4-4618 4-3825 4-3825H • High Power • Extremly Low-Ohm • High Stability • Kelvin Connection • Low Temperature Coefficient • Low Inductance SPECIFICATIONS ELECTRICAL FHR 2-3025/2-3818 FHR 4-3825H 4-3825/4-4618 R001...100R Resistance Range : R010...100R Power Rating : 3 W (70°C) without heatsink (5 W for FHR4-3825H) 40 W 50 W with heatsink Thermal Resistance Rthj-c : 2.0 K/W 1.6 K/W Tolerances from R001 from R005 from R010 from R020 : : : : : 0.5%, 1%, 2%, 5% 0.25%, 0.5%, 1%, 2%, 5% Stability : 0.1%, 0.2%, 0.5% (depends on stress) 1.0%, 0.5%, 0.1%, 0.1%, 2%, 5% 1%, 2%, 5% 0.25%, 0.5%, 1%, 2%, 5% 0.25%, 0.5%, 1%, 2%, 5% Temperature Coefficient : ±15 ppm/K (20 ... 60)°C ±25 ppm/K (20 ... 60)°C with contact F FHR 2-3025/3818 TCR Shift (see table next page) Voltage Proof : 500 VDC Thermal EMF : 1 µV/K Max. Current : 150 A / 200 A (contact F) ENVIRONMENTAL Operating Temperature Range : MECHANICAL Resistor Material Substrate Housing Connector Material Max. torque backplate : : : : : -40°C...130°C Metalfoil CuNiMn (nach DIN 17471) anodized aluminium Epoxy Cu tinned, 2- and 4-pin 1Nm Willow Technologies Ltd. Shawlands Court, Newchapel Road, Lingfield, Surrey, RH7 6BL, UK Tel. + 44 (0) 1342 835234, Fax. + 44 (0) 1342 834306, e-mail [email protected] web www.willow.co.uk FHR 2-3025 2-2818 4-4618 4-3825 4-3825H TEMPERATURE COEFFICIENT ( FHR 2-3025/3818) 2000 250 + 15 ppm/K 1000 200 -1000 - 15 ppm/K -2000 -3000 Limit 2 (3σ) -4000 -5000 Nominal dR/R TCR - Shift (ppm/K) dR/R (ppm ) 0 150 100 50 -6000 Limit 1 (3σ) DERATING CURVE 120 0 140 Temperature (°C) Resistance Value (mOhm) Power ( % from nominal power) 120 100 0,5% 80 0,2% % 0,1% 60 40 20 0 25 DIMENSIONS 50 200 100 80 100 60 50 40 20 20 5 0 10 -20 2 -7000 -40 85 100 115 130 Tem perature of the backplate (°C) FHR 4-3825 FHR 2-3025 FHR 4-4618 FHR 2-3818 Willow Technologies Ltd. Shawlands Court, Newchapel Road, Lingfield, Surrey, RH7 6BL, UK Tel. + 44 (0) 1342 835234, Fax. + 44 (0) 1342 834306, e-mail [email protected] web www.willow.co.uk FHR 2-3025 2-2818 4-4618 4-3825 4-3825H lead K >10mOhm / 50A lead A <10mOhm / 150A lead F 200A SPECIAL HOUSINGS FHR 4-3825 F FHR 4-3825H Dimensions in mm HOW TO ORDER FHR 4-3825 10R0 K 0.25% FHR 4-3825H R010 A 0.5% FHR 4-3825 R001 F 1% FHR 4-4618 R050 A 1% Willow Technologies Ltd. Shawlands Court, Newchapel Road, Lingfield, Surrey, RH7 6BL, UK Tel. + 44 (0) 1342 835234, Fax. + 44 (0) 1342 834306, e-mail [email protected] web www.willow.co.uk