You're using an active load to test amplifiers or why do you bring the THD meter's input next to it?
Hi, the connection point for the Keithley 2015 was added due to the need to place this meter on the other side of the work site (due to its depth). When measuring distortion, I don't need to run connecting wires all over the workplace, just a short jumper between this added point and the load. The connection between the measuring input and the rear input 2015 is made by a massive shielded cable which is routed outside the route of the power line for safety. If I need an accurate measurement, I connect directly to the 2015 with a cable
Edit:The load is a passive 2x300W with active cooling - my own production - a Tektronix oscilloscope is connected to special rear outputs - the output has the possibility of a range of 1:1 and 1:10 when it is switched, the ratio will change and at the same time the voltage levels on the oscilloscope will automatically change.
The BNC in the front is used to connect, for example, an analyzer or a digital oscilloscope, just as with measuring devices, only one output - front or rear - is always active, so that they cannot influence each other
Nice day 🙂 Tom