Table of Contents
- 1 What is meant by Wagner ground connection?
- 2 Why Wagner’s ground connection does not affect the balance condition?
- 3 Which bridge can be used to measure frequency?
- 4 What is meant by stray capacitance?
- 5 How do you get rid of stray capacitance?
- 6 Which are the disadvantages of Anderson bridge from the following?
- 7 What is the purpose of the Wagner earthing device?
- 8 Why is Wagner’s Earth device used in AC bridge measurement?
What is meant by Wagner ground connection?
[′wag·nər ‚grau̇nd] (electricity) A ground connection used with an alternating-current bridge to minimize stray capacitance errors when measuring high impedances; a potentiometer is connected across the bridge supply oscillator, with its movable tap grounded. Also known as Wagner earth connection.
Why Wagner’s ground connection does not affect the balance condition?
The addition of the Wagner ground connection does not affect the balance conditions, since the procedure for measurement remains unaltered.
Which conditions must be satisfied for AC bridge circuit balance?
1. Two balance equations are always obtained for an ac bridge circuit. This follows from the fact that for balance in an ac bridge, both magnitude and phase relationships must be satisfied. This requires that real and imaginary terms must be separated, which give two equations to be satisfied for balance.
Which is the guarding arm of the Wagner earth device?
Which is the guarding arm? Explanation: The series combination of R and C in a Wagner earth device forms a potential divider across the ratio arms. It is also known as the guard arm.
Which bridge can be used to measure frequency?
Wien’s bridge is used for precision measurement of capacitance in terms of resistance and frequency. It was also used to measure audio frequencies.
What is meant by stray capacitance?
From Wikipedia, the free encyclopedia. Parasitic capacitance, or stray capacitance is an unavoidable and usually unwanted capacitance that exists between the parts of an electronic component or circuit simply because of their proximity to each other.
What are the detectors used in AC bridges?
Commonly used balance detectors for AC bridges are headphones, tuned amplifiers and vibration galvanometers. Explanation: Headphones, tuned amplifier circuits and vibration galvanometers are used for detecting the balance condition in AC bridges.
Why do you get two conditions for balance in an AC bridge?
In AC bridges, there are two conditions to get bridge balance condition. These two are independent conditions for balance and both of them must be satisfied for the bridge to be balanced.
How do you get rid of stray capacitance?
How To Reduce Stray Capacitance
- Place conductors further apart. Whether it’s the traces on the PCB or cables running alongside each other, you can reduce stray capacitance by increasing the distances among them.
- Shield the conductor.
- Decrease trace width.
- Remove inner-layer ground plane.
Which are the disadvantages of Anderson bridge from the following?
Disadvantages of Andersons Bridge It is very complicated than other bridges in terms of the number of components used. Balance equations are also complicated to derive. The bridge cannot be easily shielded due to the additional junction point, to avoid the effects of stray capacitances.
What do voltmeters do?
voltmeter, instrument that measures voltages of either direct or alternating electric current on a scale usually graduated in volts, millivolts (0.001 volt), or kilovolts (1,000 volts). Many voltmeters are digital, giving readings as numerical displays.
Which bridge is frequency sensitive?
Important Points
| Type of Bridge | Name of Bridge | Important |
|---|---|---|
| AC Bridges | Campbell’s modification of Heaviside bridge | |
| De-Sauty’s bridge | Suitable for perfect capacitor | |
| Schering bridge | Used to measure relative permittivity | |
| Wein’s bridge | Harmonic distortion analyzer, used as a notch filter, used in audio and high-frequency applications |
What is the purpose of the Wagner earthing device?
Wagner Earthing Device Definition: The Wagner earthing device is used for removing the earth capacitance from the bridges. It is a type of voltage divider circuit used to reduces the error which occurs because of stray capacitance. The Wagner Earth device provides high accuracy to the bridge.
Why is Wagner’s Earth device used in AC bridge measurement?
In AC bridge measurement system, due to electrostatic effects a capacitance is formed between every node and earth. In order to nullify the effect of these earth-node capacitance “Wagner’s Earth Device” Is used. What is the most popular ADC/load balancer in the market?
What kind of circuit is Wagner Earth circuit?
The Wagner earth circuit is nothing more than a voltage divider, designed to have the voltage ratio and phase shift as each side of the bridge.
Why is the midpoint of the Wagner divider grounded?
Because the midpoint of the Wagner divider is directly grounded, any other divider circuit (including either side of the bridge) having the same voltage proportions and phases as the Wagner divider, and powered by the same AC voltage source, will be at ground potential as well.