Measuring Impedance
1‐Port Reflection Measurement (Port 1)
Description:
The measurement of low impedances can be difficult due to the limitations of various measurement techniques. The one‐port reflection method is simple and allows the measurement of impedance above approximately 100m ohms up to over 2k ohms.
Instrument: Bode 100 Vector Network Analyzer
PI Class Parts Kit Components: 50 ohm Calibrator Load Resistor, 1 ohm Resistor, Polymer Capacitor, 470uF Tantalum and 0.1uF COG Ceramic (Shunt) Capacitors
Injectors: N/A
Probes: N/A
Demo Board: N/A
Setup File: 1_port_reflection.bode3
1‐Port Reflection ‐ Voltage Reference Output Impedance
Description:
The output impedance of a voltage regulator is a critical parameter in most distributed systems. Low noise depends on a flat impedance profile with a magnitude consistent with the needs of the circuitry being powered. As many circuits do not offer control loop access to assess stability, the output impedance offers a method of assessing stability as well. This test measures the output impedance of the REF03 voltage reference with and without an output capacitor using the 1‐port reflection method.
Impedance Adapters: Capacitor ESR
Description:
The ESR of a capacitor is an important parameter that has a significant influence on the behavior of power supplies. The impedance adapter allows for easy impedance (ESR, ESL, DCR, etc.) measurement of components. This test measures the ESR and capacitance of a capacitor over a frequency range and then explores the different plotting formats available in the Bode 100.
Demo Board: N/A
Setup File: Impedance Adapters.bode3
