Low Resistance Metal Foil Sampling Resistor
Low resistance values are a crucial aspect of electronic designs. Ensuring optimal electrical conductivity can mean the difference between a high-performing circuit and a poorly functioning one. In particular, when it comes to measuring resistance in electronic systems, it is important to use metal foil sample resistors.
Description
Low resistance values are a crucial aspect of electronic designs. Ensuring optimal electrical conductivity can mean the difference between a high-performing circuit and a poorly functioning one. In particular, when it comes to measuring resistance in electronic systems, it is important to use metal foil sample resistors. These resistors are made of thin metal foil, such as copper or nickel, which is then coated with a resistive material, allowing for a precise and stable resistance measurement.
Using metal foil sample resistors in circuit designs can provide several benefits, including low thermal drift, low potential for noise generation, and high accuracy. Additionally, their thin profile allows them to fit easily into compact designs and offers considerable flexibility when it comes to positioning them within the circuit. Moreover, their resistance values are more stable and reliable than traditional wire-wound resistors.
When compared to traditional wire-wound resistors, metal foil sample resistors offer superior performance in a number of crucial ways. Wire-wound resistors often have a high temperature coefficient which can lead to inaccuracies in resistance measurements. Additionally, their construction can lead to inductance and capacitance, which can further impede precise resistance measurement in the circuit. Finally, wire-wound resistors can be limited in terms of resistance values available, whereas metal foil sample resistors are typically available in a wider range of resistance values.
In summary, employing metal foil sample resistors in electronic circuit designs offers numerous advantages in terms of low resistance values. Their precision and stability make them ideal for high-performance applications, and their low profile and flexibility in positioning make them a versatile option for designers. By using metal foil sample resistors, designers can ensure the reliability and accuracy of their circuits and produce a product that performs at its highest potential.
RNG3825
Equivalent to VPG SHR 4-3825 and equivalent to ISA RHP
Product features:
● The resistance interval is 0.005Q to 1000 Ω
● Rated power of 50W
● The resistance value precision is 0.01%
● Temperature coefficient is ± 2ppm / K
● Very low sense of resistance
● Load stability is up to 0.02%
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Table 1-Parameters |
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Mode |
RNG3825 |
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Stopped value interval |
From 0.005 to 50Ω |
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power rating |
The heat sink is not installed70℃ |
3w |
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Add radiator |
50w |
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accuracy |
0.01%/ 0.02%/ 0.05%/ 0.1%/ 0.25%/ 0.5%/1% |
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Thermal resistance |
1.6KW |
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stability (2000h) |
0.01%/ 0.02%/ 0.05%/ 0.1%/ 0.2%/ 0.5% (It also depends on the pressure size) |
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temperature coefficient |
±10ppm/K (20 to 60℃) ±5ppm/K (20 to 60℃) ±2ppm/K (20 to 60℃) |
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Pressure resistance value |
500VDC |
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Maximum current |
50A |
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Thermoelectric potential |
<1μV/K |
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Operating temperature interval |
-40 to 130℃ |
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Resistance material |
Manganese copper, nichrome foil |
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placode |
Aluminium oxide, red copper |
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Protective layer |
Epoxy resin |
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Electrode material |
Tinned copper |
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Pin count |
4 |
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Maximum torque |
1Nm |
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Figure 2-The reduced power curve |
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Rated Power Note- SHR Series resistance connected to a suitable radiator for use. The maximum internal temperature is 130°C. Using the following formula: Where: RθH= thermal resistance of the radiator (K / W) RθR = electric resistance of thermal resistance (K / W) TMAx = maximum resistance maximum working temperature TA = Ambient temperature of radiator (℃) P = power of resistor (W) |
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Table 3- Temperature coefficients |
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Figure 4-Table 4 Line connection |
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For low resistance resistance (less than 10 Ω), the increase in the resistance and temperature coefficient of the copper pin exceeds the resistance itself. A four-legged Kelvin connection is recommended, as shown in the figure below. The load current on the V-pin will cause a measurement error.
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| Figure 5-Product size drawing |
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