Method For Verifying Short (Zero) Connection When Using Kelvin Klips

Kelvin Klips are four-terminal connector clips designed to provide rapid, precise connections to a device or unit under test (DUT/UUT). Used properly, Kelvin Klips eliminate measurement errors caused by lead resistance and/or improper connections.

Kelvin Klips Require Zero Verification

To ensure proper operation of an instrument with Kelvin Klips, a short (Zero) verification should be part of your standard work practices. This ensure that all four wires of a Kelvin Klip set are intact and firmly operational. Without this verification, you run the risk of significant measurement error.

Procedures for a Proper Short (Zero) Test

            Short (Zero) tests should be performed when:

  1. The test instrument/meter has not been used for a period of 6 hours or more.
  2. The test set-up has been changed.
  3. The DUT/UUT has changed significantly.
  4. Test procedures call for such verification.
  5. Uncertainty or change has been introduced into the test set-up or environment.

The basic procedures follow:

  1. Apply power to the instrument and allow adequate warm-up. In a temperature controlled lab, you should allow at least 20 minutes warm-up time for stable readings. If the instrument’s environment is not well controlled, allow 60 minutes for warn-up.
  2. Connect the leads of the Kelvin Klips to the input jacks.
  3. Establish instrument settings (Measurement function in lowest range)
  4. Short the Kelvin Klips together as figure below (Creating a 1/4 ~ 3/8 inch space between its jaws, Do not clamp Kelvins Klips directly together).
  5. Verify that the reading on the digital instrument display is within 5 counts of zero.

Source: TMC


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