berger.h
Member level 5
I need measure current on high side,
max voltage 50V
max current 30A
shunt 3mOhm
Gain min 20 max 50
Bandwith about 100kHz
I tried ina168 with Gain 10 (25k resistor), but this amp. have input offset +-2mV and in real was PROBLEM on low current.
For current under 500mA was output unstable for example for 400mA current, 1,5mV on shunt was on output senseless 600mV, for 600mA 68mV, for 700mA 10,6mV. 600mV for low current .
The problem is high voltage (600mV) for low current (under 400mA)
I thing I need amplifier with lower input offset.
max voltage 50V
max current 30A
shunt 3mOhm
Gain min 20 max 50
Bandwith about 100kHz
I tried ina168 with Gain 10 (25k resistor), but this amp. have input offset +-2mV and in real was PROBLEM on low current.
For current under 500mA was output unstable for example for 400mA current, 1,5mV on shunt was on output senseless 600mV, for 600mA 68mV, for 700mA 10,6mV. 600mV for low current .
The problem is high voltage (600mV) for low current (under 400mA)
I thing I need amplifier with lower input offset.