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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?