Capacitor high and low temperature test fixture

What is a capacitor leakage test system?

Capacitor leakage test system In this test system, a single instrument, the Model 6517A, provides both the voltage sourcing and low current measurement functions. This instrument is particularly useful for this applica-tion because it can display either resistance or leakage current and will source up to 1000V DC.

What is a common unit for qualification of capacitor leakage?

This is because the resistance is proportional to the thickness of the dielectric, and inverse to the capacitive area. The capacitance is proportional to the area and inverse to the separation. Thus, a common unit for qualification of capacitor leakage is the product of its capacitance and leakage resistance, usually in megohm-microfarads (MΩ ·μF).

Which high resistance test fixture can be used with the 6517a?

For single capacitor testing, the Model 8002A High Resistance Test Fixture can be used with the 6517A. The Model 8002A has been specifically designed to minimize leakage Figure 6. Capacitance and IR measurement system currents that can become a significant portion of a high resistance measurement if not controlled.

How does a 6517a electrometer measure capacitor leakage?

The 6517A Electrometer offers several advantages when measuring capacitor leakage. The 6517A contains a low noise, variable 1kV voltage source for making high resistance measurements, with built-in current limiting. For a given capacitor, a larger applied voltage within the voltage rating of the capacitor, will give a larger leakage current.

What causes a capacitor to fall short of perfect?

In many cases, however, complex electrochemical interactions cause capacitors to fall short of perfect. One of the less ideal properties that a capacitor has is leakage, or insulation resistance (IR). For a given dielectric material, the effective parallel resistance is inversely proportional to the capacitance.

What is a low leakage capacitor?

Electrolytic capacitors such as tantalum or alumi-num have much lower leakage resistances, in the region from 1MΩ ·μF to 100MΩ ·μF. For example, a 4.7μF aluminum cap specified as 50MΩ ·μF is guaranteed to have at least 10.6MΩ insulation resistance. When measuring extremely low leakage capacitors, there are a number of things to keep in mind.