Resistivity
Standard Test Method for Specific Resistance (Resistivity), ASTM D1169
Dissipation Factor, or Liquid Power Factor, is a measure of the dielectric losses in an insulating liquid when used in an alternating current electric field.
Specific Resistance (Resistivity) can be measured in the same device, but with a direct current instead of alternating current. This is an electrical property of the oil, related to its function. High resistivity reflects a low content of charge carrying contaminants. In the U.S., it is most often run on new oil and is not as widely used as power factor. There are in-service standards for resistivity that are widely used overseas.
Dissipation Factor, or Liquid Power Factor, is a measure of the dielectric losses in an insulating liquid when used in an alternating current electric field.
Specific Resistance (Resistivity) can be measured in the same device, but with a direct current instead of alternating current. This is an electrical property of the oil, related to its function. High resistivity reflects a low content of charge carrying contaminants. In the U.S., it is most often run on new oil and is not as widely used as power factor. There are in-service standards for resistivity that are widely used overseas.