To ensure low leakage current and low dielectric absorption, the feed back capacitor should be made of a suitable dielectric material such as poly styrene, polypropylene, or Teflon.
Applications for Measuring Voltage from High Resistance Sources: Capacitor dielectric absorption and electrochemical measurements.
各种高阻源电压测量的应用：电容器的介电吸收和电化学测量等。
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When an infrared heater is used, please pay attention to the extent of heating since the absorption rate of infrared will vary due to difference in the color and size of the capacitor.