Kelvin Electronics

Listing Results Kelvin Electronics

Frequently Asked Questions

• How are voltages measured with a Kelvin connection?

  Fig. 2 is an electrical block diagram that illustrates how PV current–voltage measurements are made. A four-wire (or Kelvin) connection to the device under test allows the voltage across the device to be measured by avoiding voltage drops along the wiring in the current measurement loop.

• When to use Kelvin connection with sense resistor?

  Kelvin connection of the −IN and +IN inputs to the sense resistor should be used in all but the lowest power applications. Solder connections and PC board interconnections that carry high current can cause significant error in measurement due to their relatively large resistances.

• Is the Kelvin bridge capable of measuring electrical resistance?

  Before we introduce Kelvin Bridge, it is very essential to know what is the need of this bridge, though we have Wheatstone bridge which is capable of measuring electrical resistance accurately (usually an accuracy of around 0.1%). To understand the need of Kelvin bridge we must first recognize 3 important ways to categorize electrical resistance:

• Why are Kelvin contacts important in a charger?

  In any high current, >1A, application, Kelvin contacts to the sense resistor are important to maintain accuracy. This simple illustration from a battery charger application shows two voltage-sensing traces added to the pads of the current sense resistor.