Evaluation system and evaluation method

An evaluation system comprising:

• an analog-to-digital converting section configured to convert an analog signal to a digital signal, the analog signal being acquired by a physical quantity acquiring section and indicative of a time-series change of at least one of (i) welding current, welding voltage, or load applied to pieces to be welded during welding and (ii) a displacement, during welding, of a welding head of a welding apparatus that is configured to apply the welding current, welding voltage, or load to the pieces to be welded;
• and
• an evaluating section configured to acquire the digital signal and determine, based on the digital signal, whether or not at least one of (i) the welding current, welding voltage or load applied during welding and (ii) the displacement satisfies a predetermined condition, wherein
• the analog-to-digital converting section is comprised of a programmable circuit, and
• configuration data for configuring the programmable circuit is arranged to be changeable by a user.