Input range: -100mV to +60mV
Voltage supplies to the op-amp= ±15V
how do we find the input offset voltage?
The max. Input offset voltage(Vos) is
specified by the Manufacturer and is
listed on the spec. sheet.
To find the input offset voltage of an operational amplifier (op-amp), you can follow these steps:
1. Ensure that the voltage supplies to the op-amp are properly connected to ±15V, as you mentioned.
2. Connect the non-inverting input terminal of the op-amp to the virtual ground, which is typically achieved by connecting a resistor (usually in the kilo-ohm range) between the inverting and non-inverting input terminals.
3. Apply a zero voltage (short circuit) at the input terminals of the op-amp. This means you connect the inverting and non-inverting input terminals together.
4. Measure the output voltage of the op-amp using a voltmeter. The output voltage is ideally zero when the inputs are shorted together. However, due to input offset voltage, there may still be a residual output voltage.
5. The measured output voltage, under the assumption that it is due to the input offset voltage, represents the input offset voltage of the op-amp.
Note that the accuracy of your measurement (the resolution of your voltmeter) will affect the precision with which you can determine the input offset voltage.