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Resistors in seriesRunning
Equation balance. Second resistor at 12.8 Ω. Loop resistance 80.8 Ω, Target resistance 150 Ω. Currently loop resistance is short by 69.2 Ω.TUNINGLOOP RESISTANCETARGET RESISTANCE12.8 Ω
t = 0.0s

Loop resistance

80.8Ω

Target resistance

150Ω

12.8 Ω

Equation balance. Second resistor at 12.8 Ω. Loop resistance 80.8 Ω, Target resistance 150 Ω. Currently loop resistance is short by 69.2 Ω.

What has to balanceRT=R1+R2R_T = R_1 + R_2

What is happening

You are called to a lab bench dropping a supply down to a safe test voltage.

The meter is reading the wrong total. It must show 150 Ω, a 68 Ω resistor is already in the loop, and the second one pulled from the drawer is the wrong value.