- #1
ranju
- 223
- 3
in determining resistance R1 & R2 in an ohmmeter... the resistance at half scale deflection is used...why particularly this resistance is being used.. why not the resistances at deflection of other current values...?? Is this for convenience??
Also , Rh (resistance at half scale deflection ) is regarded as internal resistance of ohmmeter looking into terminals A & B.. how..?? Is thevenin's is being used over here.that's why such calculations are there..( Rh=R1+R2Rm/R2+Rm) where Rm=meter resistance
Also , Rh (resistance at half scale deflection ) is regarded as internal resistance of ohmmeter looking into terminals A & B.. how..?? Is thevenin's is being used over here.that's why such calculations are there..( Rh=R1+R2Rm/R2+Rm) where Rm=meter resistance