Determining capacitive reactance with a Wien measuring bridge

VP3.6.4.1
Determining capacitive reactance with a Wien measuring bridge
Determining capacitive reactance with a Wien measuring bridge Schematic circuit diagram: Wien measuring bridge (left) - Maxwell measuring bridge (right) (P3.6.4.1-4)
Determining capacitive reactance with a Wien measuring bridge

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Description

The experiment P3.6.4.1 investigates the principle of a Wien measuring bridge for measuring a capacitive reactance Z1. In this configuration, Z2 is a fixed capacitive reactance, Z3 is a fixed ohmic resistance and Z4 is a variable ohmic resistance. For zero compensation, the following applies regardless of the frequency of the AC voltage:

An oscilloscope can be used as a zero indicator.

Components of equipment sets

2 57681  4  Plug-in board safety socket, 20/10 LD
1 57732  4  Resistor 100 Ohm, STE 2/19 LD
1 57793  4  Potentiometer, 1 kΩ, 10-turn, STE 4/50 LD
1 57815  4  Capacitor, 1 µF, bipol., STE 2/19 LD
1 57816  4  Capacitor, 4.7 µF, bipol., STE 2/19 LD
1 575302 Oscilloscope 30 MHz, digital, PT1265 LD
1 57524  4  Screened cable, BNC/4 mm Plug LD
1 522621  4  Function generator S 12 LD
1 50148  4  Bridging plugs STE 2/19, set of 10 LD
1 500621  4  Safety experiment cable, 50 cm, red LD
1 500622  4  Safety experiment cable, 50 cm, blue LD

Experiment Instructions

PDF (Experiment description) PDF (Experiment description) P3.6.4.1 Determining capacitive reactance with a Wien measuring bridge
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