I set the gen at 1 Khz, calibrated the PT analog output signal to 1.228 V. I guesss this would be my +4dBu reference.
I fed that signal to the AD input, and calibrated the AD section to -20dBfs. on the PSX, (lowest possible LED).
Then I re-routed the same calibrated signal (in PT) to the S/PDIF output, and sequentially to the PSX S/PDIF input, thus sending the same calibrated signal of the AD section to the input of the DA section of the PSX.
I then used the meter to measure the output of the DA section, and trimmed the output until the meter read 1.228 V.
Is this correct?