I'm guessing that you don't actually have a PEB, and your usage of the word retain vs. attain, was a grammatical impasse.
Where I attended technical school, they had bolted the test instruments together, using metal bars. This defeated the isolation called for in the building/testing of the AM/FM Radio kit. For those whom did not over-drain the supplied HI-WATT, carbon battery, most measurements were nearly in-range, and they were able to complete the labs successfully. For those whom used a brand-new replacement alkaline battery, and took a bit longer to complete the test, a smoked resistor defeated their efforts. The teacher suggested that I was wrong about the isolation issue. After I showed that the continuity between the instruments normally isolated grounding terminals was ZERO Ohms, he argued that I was wrong, stating, "you can't use one Multimeter to test another" ...the class of course agreed... and all laughed at me. When I showed the potential between the two separately grounded test points, he claimed it was caused by a shorted transistor. Though when I repaired the circuit by replacing the predicted resistor, with my own, well, at least the tune on the radio changed.
Fairly certain that the designers wishes, in no way impinge on my sovereign right to except as much monies as you are willing to pay me in compensation for my expertise! The true issue being that I have neither the time nor the resources. Sorry.