Inductive Free Precision Metal Foil Sampling Resistor

In high-precision electronic circuits, the accuracy of resistance values is critical. Traditional resistors with inductance can cause unwanted effects on circuit performance. The use of inductance-free resistors, such as metal foil sample resistors, eliminates these effects and improves circuit performance.

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Description

Inductance-Free Precision Metal Foil Sample Resistors

Metal foil resistors the thickness of the foil determines the resistor's value, which is typically very low, from fractions of an ohm to a few hundred ohms. These resistors are manufactured to extremely tight tolerances, ensuring high precision and reliability.

In addition to their inductance-free properties, metal foil sample resistors exhibit very low thermal EMF and low noise. This makes them ideal for use in precision circuits, such as amplifiers, filtering circuits, and measuring instruments.

One of the most significant advantages of metal foil sample resistors is their stability over time. They are not susceptible to drift or aging, ensuring that they maintain their accuracy and reliability over extended periods of time.

The use of metal foil sample resistors is not limited to precision circuits. They can also be used in high-frequency circuits, as their small size and low inductance make them suitable for high-speed applications.

In conclusion, metal foil sample resistors are an excellent choice for high-precision electronic circuits that require high accuracy, stability, and reliability. Their inductance-free properties, low noise, and thermal EMF make them ideal for use in amplifiers, measuring instruments, and high-speed circuits.

Metal foil sampling resistor RNG6040

Product features:

● Resistance ranges from 0.005Ω to 1000Ω

● Rated power up to 50W

● Resistance accuracy is ±0.01%

● Temperature coefficient is ±2ppm/K

● Non-inductive design

● Load stability up to 0.02%

● Load life stability: 0.02%

Table 1-Parameters
mode		RNG6040
Stopped value interval		From 0.005 to 1000Ω
power rating	The heat sink is not installed70℃	20w
	Add radiator	60w
accuracy		0.01%/ 0.025%/ 0.05%/ 0.1%
Thermal resistance		1.6KW
stability (2000h)		0.02%(Maximum variation)
temperature coefficient		±10ppm/K (20 to 60℃) ±5ppm/K (20 to 60℃) ±2ppm/K (20 to 60℃)
Pressure resistance value		500VDC
Maximum current		50A
Thermoelectric potential		<1μV/K
Operating temperature interval		-40 to 130℃
Resistance material		Manganese copper, nichrome foil
placode		Aluminium oxide
Protective layer		Epoxy resin
Electrode material		Tinned copper
Pin count		4
Maximum torque		1Nm

Table 1- Temperature coefficients

Product Temperature coefficient curve △R/RPPM

Figure2-The reduced power curve

product-391-280

Rated Power Note-

RNG6040 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)

Table 3 Line connection

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.