What is an amplifier, PGA or PGIA? | LabJack
 
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What is an amplifier, PGA or PGIA?

A PGA (Programmable Gain Amplifier) provides variable gain which is controlled in software. It is used to amplify low voltages on analog inputs. Most LabJacks have an internal PGA that can be used to provide small gains in some situations, but for larger gains an external amplifier must be used.