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riedon inc. 300 cypress avenue alhambra ca 91801 (626) 284-9901 (626) 284-1704 www.riedon.com 06/13 fhr 2-3025 3818 fhr 4-3825 3825h 4618 precision shunt resistors type fhr 2-3025 fhr 2-3818 fhr 4-3825 fhr 4-3825h fhr 4-4618 resistance range 0.010 to 100ohms 0.001 to 100ohms power rating free air 70c for 3825h with heatsink 3 w 40 w 3 w 5 w 50 w thermal resistance rthj-c 2.0 k/w 1.6 k/w tolerances from 0r001 from 0r005 from 0r01 from 0r02 0.5% / 1% / 2% / 5% 0.25% / 0.5% / 1% / 2% / 5% 1% / 2% / 5% 0.5% / 1% / 2% / 5% 0.1% / 0.25% / 0.5% / 1% / 2% / 5% 0.1% / 0.25% / 0.5% / 1% / 2% / 5% stability 0.1% / 0.2% / 0.5% (depends on stress) temperature coeffcient standard option 1 15ppm/k (20 to 60c) r 0r2 tcr see table a next page 15ppm/k (20 to 60c) 25ppm/k (20 to 60c) for contact f 10ppm/k (20 to 60c) (only contact a and k) max. current 150 a / 200 a for contact f voltage proof 500 vdc thermal emf < 0.1v/k operating temperature range -40 to 130c resistor material cunimn-foil substrate anodized aluminium housing epoxy connector material cu tinned terminals 2 4 max. torque 1 nm specifications part description: part type - resistance - contact - tolerance fhr 4-4618 0.050 ohms a 1% ordering information ? resistances from 0.001ohm to 100ohms ? power rating to 50watt ? resistance tolerances to 0.1% ? tcr to 10ppm/c ? very low inductance ? isolated back plate
riedon inc. 300 cypress avenue alhambra ca 91801 (626) 284-9901 (626) 284-1704 www.riedon.com 06/13 0 20 40 60 80 100 120 25 50 85 100 115 130 temperature of the backplate (c) power ( % from nominal power) 0.5% 0.1% 0.2% temperature coeffcient specifications (continued) fhr 2-3025 3818 fhr 4-3825 3825h 4618 dimensions derating precision shunt resistors -15ppm/k +15ppm/k nominal ?r/r limit 2 (3) limit 1 (3) temperature (c) ?r/r (ppm) 4000 2000 0 -2000 -4000 -6000 -8000 -20 0 -40 80 140 120 100 60 20 40 100 resistance value (mohm) 5 150 10 200 20 50 2 200 0 250 50 100 tcr - shift (ppm/k) table a fhr 4-3825 / fhr 4-3825h dimension mm tol. (mm) inches tol. (inches) a 24.00 0.2 0.94 0.008 b 38.00 0.3 1.50 0.012 c 1.40 0.4 0.06 0.016 d 4.00 0.1 0.16 0.004 e 17.50 0.2 0.69 0.008 f 1.5x45 0.1 0.06x45 0.004 g 27.50 0.2 1.08 0.008 h 17.50 0.2 0.69 0.008 i (a-contact) 1.50 0.1 0.06 0.004 i (k-contact) 1.10 0.1 0.04 0.004 j 3.00 0.1 0.12 0.004 k 3.20 0.1 0.13 0.004 l 2.00 0.1 0.08 0.004 m 6.00 0.2 0.24 0.008 m (variante h) 10.8 0.2 0.43 0.008 n 30.40 0.4 1.20 0.016 o 15.00 0.2 0.59 0.008 p (a-contact) 3.60 0.1 0.14 0.004 p (k-contact) 3.30 0.1 0.13 0.004 q 2.80 0.1 0.11 0.004 r 19.00 0.2 0.75 0.008 power rating notes - the fhr series resistors must be attached to a suitable heat - sink. the maximum internal resistor temperature is 130c. to specify an appropriate heatsink use the following formula : r qh = t max - ( p x r qr ) - t a p where: r qh = thermal resistance of heatsink ( k/w ) r qr = thermal resistance of resistor ( k/w ) t max = maximum temperature of resistor t a = ambient temperature of heatsink ( c ) p = power through resistor ( w )
riedon inc. 300 cypress avenue alhambra ca 91801 (626) 284-9901 (626) 284-1704 www.riedon.com 06/13 specifications (continued) fhr 2-3025 3818 fhr 4-3825 3825h 4618 precision shunt resistors dimension mm tol. (mm) inches tol. (inches) a 24.00 0.2 0.94 0.008 b 38.00 0.3 1.50 0.012 c 1.50 0.2 0.06 0.008 d 4.00 0.1 0.16 0.004 e 34.00 0.3 1.34 0.012 f 17.50 0.2 0.69 0.008 g 1.5x45 0.1 0.06x45 0.004 h 34.00 0.2 1.34 0.008 i 32.70 0.2 1.29 0.008 j 7.50 0.2 0.30 0.008 k 24.00 0.2 0.94 0.008 l 6.30 0.2 0.25 0.008 m 4.80 0.1 0.19 0.004 n 3.20 0.1 0.13 0.004 o 2.00 0.1 0.08 0.004 p 6.00 0.2 0.24 0.008 q 15.00 0.2 0.59 0.008 r 4.10 0.7 0.16 0.028 s 3.30 0.7 0.13 0.028 dimension mm tol. (mm) inches tol. (inches) a 17.00 0.1 0.67 0.004 b 46.00 0.3 1.81 0.012 c 1.40 0.4 0.06 0.016 d 8.50 0.2 0.33 0.008 e 40.00 0.3 1.57 0.012 f 34.00 0.3 1.34 0.012 g 1.5x45 0.1 0.06x45 0.004 h 17.50 0.2 0.69 0.008 i 27.50 0.2 1.08 0.008 j (a-contact) 1.50 0.1 0.06 0.004 j (k-contact) 1.10 0.1 0.04 0.004 k 3.00 0.1 0.12 0.004 l 3.20 0.1 0.13 0.004 m 2.00 0.1 0.08 0.004 n max.5.5 0.2 max.0.22 0.008 o 23.40 0.4 0.92 0.016 p 15.00 0.2 0.59 0.008 q (a-contact) 3.60 0.1 0.14 0.004 q (k-contact) 3.30 0.1 0.13 0.004 r 2.80 0.2 0.11 0.008 fhr 4-3825f fhr 4-4618
riedon inc. 300 cypress avenue alhambra ca 91801 (626) 284-9901 (626) 284-1704 www.riedon.com 06/13 specifications (continued) fhr 2-3025 3818 fhr 4-3825 3825h 4618 precision shunt resistors dimension mm tol. (mm) inches tol. (inches) a 24.00 0.2 0.94 0.008 b 30.00 0.2 1.18 0.008 c 1.40 0.4 0.06 0.016 d 4.00 0.1 0.16 0.004 e 27.00 0.2 1.06 0.008 f 15.00 0.2 0.59 0.008 g 1.5x45 0.1 0.06x45 0.004 h 20.32 0.2 0.80 0.008 i (a-contact) 1.50 0.1 0.06 0.004 i (k-contact) 1.10 0.1 0.04 0.004 j 1.10 0.1 0.04 0.004 k 3.20 0.1 0.13 0.004 l 2.00 0.1 0.08 0.004 m max.5.5 0.2 max.0.22 0.008 n 30.40 0.4 1.20 0.016 o 15.00 0.2 0.59 0.008 p (a-contact) 3.60 0.1 0.14 0.004 p (k-contact) 3.30 0.1 0.13 0.004 q 2.80 0.2 0.11 0.008 dimension mm tol. (mm) inches tol. (inches) a 17.00 0.2 0.67 0.008 b 38.00 0.3 1.50 0.012 c 1.40 0.4 0.06 0.016 d 8.50 0.2 0.33 0.008 e 32.00 0.3 1.26 0.012 f 27.00 0.2 1.06 0.008 g 1.5x45 0.1 0.06x45 0.004 h 20.32 0.2 0.80 0.008 i (a-contact) 1.50 0.1 0.06 0.004 i (k-contact) 1.10 0.1 0.04 0.004 j 1.10 0.1 0.04 0.004 k 3.20 0.1 0.13 0.004 l 2.00 0.1 0.08 0.004 m max.5.5 0.2 max.0.22 0.008 n 23.40 0.4 0.92 0.016 o 15.00 0.2 0.59 0.008 p (a-contact) 3.60 0.1 0.14 0.004 p (k-contact) 3.30 0.1 0.13 0.004 q 2.80 0.2 0.11 0.008 fhr 2-3818 fhr 2-3025

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