Temperature Effects
Temperature can have a large impact on the DUT impedance. Usually, capacitors have large temperature coefficients (5% to 80% variation over the entire temperature range, depending upon the capacitor used) except for ceramic COG capacitors, which can exhibit only a 0.003%/°C variation. Inductors, especially those with non-air cores, may vary largely with temperature. Ambient and DUT temperature drifts (due to handling, for instance) may introduce error into the measurement. Control ambient temperature changes to reduce errors.