I would like to capture a high voltage AC signal on an oscilloscope.
Input signal: 160V @ 400Hz
Output signal: ~40V @ 400Hz
I intend to use a voltage divider: 100k ohm (1/2 watt) resistor and 27k ohm (unknown power rating).
My calculations: I = V/R = 160V / (127k ohm) = 1.26 mA Vout = Vin * R2 / (R1 + R2) = 160V * 27k ohm / (100 k ohm + 27 k ohm) = 34.0 V P_r1 = I^2 * R1 = (1.26 mA)^2 * 100k ohm = 159 mW P_r2 = I^2 * R2 = (1.26 mA)^2 * 27k ohm = 43 mW
Is using this voltage divider a good method to view the 160V (400Hz) signal?
If not, what do you recommend?