Value and Type of Capacitor required?

[mhs100]

Hi all

I have a Daq card whose input voltage range is +/- 10 Volts. I want to measure a signal
which consists a Dc offset of 8 Volts and on this DC offset a sine wave of +10 V pk-pk
is riding having the frequency of 125 Hz. My question is that i want to eliminate the DC offset
and only want to measure the sinusoidal wave. For this reason, i have decided to use the capacitor
but can anyone tell me that what type and value of capacitor should i use in series? Should i use polar or non polar?
and what value? such that impedance is very low.

Any help will be greatly appreciated

[Henrik_Volkers]

Another important value is the input impedance of your analog input. and the max error...   GOhm or 10kOhm makes a difference 😉

Draw the schematic and you can calculate the range you need. ( Nowadays you simulate these with ??SPice to get nice charts)

Short:  1µ poly is a good starting point 😉