Engineer's Mini-Notebook – OpAmp IC Circuits; Forrest Mims III; Radio Shack; 49 pages; 1985; ASIN B000DZG196.
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But testing is not confined to DC (zero frequency); often an operational amplifier will also have its PSRR given at various frequencies (in which case the ratio is one of RMS amplitudes of sinewaves present at a power supply compared with the output, with gain taken into account).