RC Filter measured response differs from calculated transfer function
For an RC, the pole is at 1/RC rad/sec, or 1/2piRC Hz.  You'll be doing this calculation your whole career, so the thing to remember is:

1K 1uF 160Hz

Since they're linear, you can adjust any two...as above, 1/15K and 5uF makes for 15/5*160Hz, or 480Hz.  Multiply by 2pi to get rad/s.