I'm testing frequency response of my new Input Transformer (600R:600R) with Permalloy80 core and OCC Silver/Ag wire with QuantAsylum QA402.
Ideally I should have put 500R resistor in series on the input (QA402 has 100R in series already), and also load 600R Resistor on the output of the transformer to simulate a real 600:600 test. But as this test is only to do a quick check on the performance, so I just take whatever I have on my bin. So no additional load on the input (just 100R on the QA402) while the output is loaded with 1K5 and 100K (two tests done).