When performing an ASTM D877 dielectric breakdown test, is the fluid continuously stirred?

In an ASTM D877 dielectric breakdown test, the fluid is not continuously stirred during the test. This is important because the dielectric breakdown voltage of a fluid is measured under controlled conditions to assess its insulating properties. Continuous stirring could introduce unwanted air bubbles or turbulence that may affect the measurement, leading to inaccurate results.

The test involves applying a voltage across two electrodes submerged in the fluid, and it is crucial that the fluid remains stable to ensure that the dielectric strength is evaluated accurately. At rest, the fluid allows for a consistent electric field to develop, providing reliable data regarding the breakdown voltage. Therefore, the correct understanding is that the fluid should not be stirred throughout the testing process to maintain the validity of the measurement.