FHR
2-3025 3818
FHR
4-3825 3825H 4618
Precision Shunt Resistors
SPECIFICATIONS
(continued)
Temperature Coefficient
4000
250
2000
table A
+15ppm/K
200
0
-15ppm/K
Limit 2 (3σ)
Nominal ∆R/R
Limit 1 (3σ)
-2000
-4000
TCR - Shift (ppm/K)
∆R/R (ppm)
150
100
-6000
50
-8000
-40
-20
0
20
40
60
80
100
120
140
0
2
Temperature (°C)
Resistance Value (mOhm)
5
10
20
50
100
200
Derating
120
Power ( % from
nominal power)
Power Rating Notes -
100
80
60
40
20
0
25
0.5%
0.2%
0.1%
The FHR Series Resistors must be attached to a suitable heat-
sink. The maximum internal resistor temperature is 130°C.
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 )
50
85
100
115
130
Temperature of the backplate (°C)
Dimensions
FHR 4-3825 / FHR 4-3825H
Dimension
A
B
C
D
E
F
G
H
I
J (A-Contact)
J (K-Contact)
K
L
M
N
N (Variante H)
O
P
Q (A-Contact)
Q (K-Contact)
R
S (Variante H)
mm
24.00
38.00
1.40
4.00
34.00
17.50
1.5x45°
17.50
27.50
1.50
1.10
3.00
3.20
2.00
max.5.5
max.10.3
30.40
15.00
3.60
3.30
2.80
19.00
tol.
(±mm)
0.2
0.3
0.4
0.1
0.3
0.2
0.1
0.2
0.2
0.1
0.1
0.1
0.1
0.1
0.2
0.2
0.4
0.2
0.1
0.1
0.1
0.2
inches
0.94
1.50
0.06
0.16
1.34
0.69
0.06x45°
0.69
1.08
0.06
0.04
0.12
0.13
0.08
max.0.22
max.0.4
1.20
0.59
0.14
0.13
0.11
0.75
tol.
(±inches)
0.008
0.012
0.016
0.004
0.012
0.008
0.004
0.008
0.008
0.004
0.004
0.004
0.004
0.004
0.008
0.008
0.016
0.008
0.004
0.004
0.004
0.008
Powertron GmbH
Potsdamer Strasse 18a D-14513 Teltow
+49 (0)3328 3530-0
A Riedon Company
www.powertron.de
+49 (0)3328 3530-15
Page 19
rev. 03/2006A
RIEDON [ RIEDON POWERTRON ]
