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phymath7
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- TL;DR Summary
- Why post office box can't be used to measure high or low resistance?
Why meter bridge is chosen over post office box to measure low resistance?
https://en.m.wikipedia.org/wiki/Post_office_box_(electricity)gneill said:What is "post office box" (or "vox")?
Who says it can't be used to measure high or low resistance ?phymath7 said:TL;DR Summary: Why post office box can't be used to measure high or low resistance?
Why meter bridge is chosen over post office box to measure low resistance?
I think the measurement range will be limited by the available ratio arms and standard resistances. In addition, a bridge does not make best use of the meter sensitivity because it is shunted by the bridge components. There is a sensitive method for low resistances where we first pass a current through the meter to give full scale deflection and then measure the drop in reading when the meter is shunted by the unknown low resistance.phymath7 said:TL;DR Summary: Why post office box can't be used to measure high or low resistance?
Why meter bridge is chosen over post office box to measure low resistance?
Low resistance refers to the electrical resistance of a material or component that is below a certain threshold. It is important to measure low resistance because it can indicate the quality and functionality of the material or component, and can also help identify any potential faults or defects.
Low resistance is typically measured using a meter bridge, which is a type of electrical circuit that uses a known resistance and a variable resistance to determine the unknown resistance of a material or component.
The meter bridge is the preferred choice for measuring low resistance because it is a simple, accurate, and cost-effective method. It also allows for a wide range of resistances to be measured, making it versatile for various applications.
A meter bridge typically consists of a known resistance, a variable resistance, a galvanometer, and a power source. The known resistance and variable resistance are connected in series, while the galvanometer is connected in parallel to the variable resistance.
Yes, there are some limitations to using a meter bridge for measuring low resistance. The accuracy of the measurement can be affected by factors such as temperature, contact resistance, and the quality of the connections. Additionally, the meter bridge may not be suitable for measuring extremely low resistances or resistances that are constantly changing.