Hello
I'm currently trying to make a current sensor using a 0.01 ohm resistor and an op amp with gain across the resistor.
Here is the schematic:
It says in the datasheet of the LM392 that it is suitable for sensing 'near or at ground' but I'm not getting any results.
With about 130 ma flowing through the rsense I get a 1.7 mV (should be 1.3mV) drop across the rsense if I measure it with a meter but the op amp gives me some -3mV on the output.
I also tried flipping the op amp inputs across the rsense around and I get a similar negative result.
Am I overlooking something obivous and/or important here?
Thanks in advance
I'm currently trying to make a current sensor using a 0.01 ohm resistor and an op amp with gain across the resistor.
Here is the schematic:
It says in the datasheet of the LM392 that it is suitable for sensing 'near or at ground' but I'm not getting any results.
With about 130 ma flowing through the rsense I get a 1.7 mV (should be 1.3mV) drop across the rsense if I measure it with a meter but the op amp gives me some -3mV on the output.
I also tried flipping the op amp inputs across the rsense around and I get a similar negative result.
Am I overlooking something obivous and/or important here?
Thanks in advance