Not exactly. The DELTA4000 measures the harmonic content of the signal in every test and, based on this information, calculates a Voltage Dependence Factor (VDF). If this value is too high (default > 0.5), the number turns red, indicating a voltage dependence of the test object. In this situation, a tip-up (step voltage) test should be performed to verify and quantify the voltage dependence. This feature gives reassurance that a voltage-sensitive dielectric problem doesn’t go missed, particularly in an asset that doesn’t have a proclivity for developing voltage-sensitive dielectric problems and, therefore, is not routinely subjected to tip-up tests.