current checking

Thread Starter

chrissyp

Joined Aug 25, 2008
82
I am building a test unit to monitor the current delivered by a wiring loom controlled by a current configured LM317.I am going to use a Lascar SP 400 lcd display for the readout.To get the reading i require the data sheet say's that the Rb shunt resistor should be 1R , i see that the sums are fine.My question is on the +v rail is a resistor (Ra) which states it should be 0R.Do i need to use an 0R resistor, if so why, does this afford some protection in the circuit or can i disregard it and just wire straight in.
 

mik3

Joined Feb 4, 2008
4,843
I am building a test unit to monitor the current delivered by a wiring loom controlled by a current configured LM317.I am going to use a Lascar SP 400 lcd display for the readout.To get the reading i require the data sheet say's that the Rb shunt resistor should be 1R , i see that the sums are fine.My question is on the +v rail is a resistor (Ra) which states it should be 0R.Do i need to use an 0R resistor, if so why, does this afford some protection in the circuit or can i disregard it and just wire straight in.
A schematic would be helpful but if a resistor has a value of zero (there is not such a think unless its a superconductor!) then you replace it by a wire.
 
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