Early on in my career, I saw a test system with multiple screw terminals and wires going all over the place. And then (inevitably), there'd be a problem with the system. The problem would be fixed once a loose wire was identified and then put back in place, but someone had to go through all of these wires to figure it out.
But if everything is connected to a circuit board, you will greatly reduce problems with wiring. In addition, recreating your test system or even just disconnecting a card for calibration is much easier. On this board, you can also add any additional components: load impedance, extra transistors/relays, signal conditioning, etc.
So before you start soldering things for a custom cable or wire harness for your test system, at least consider making a circuit board for the long term.
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