HP 120A - Page 23

Sect. II Page 7
AC COUPLING — BALANCED INPUT
1. Set VERTICAL SENSITIVITY control to 10
millivolts/cm.
2. Set AC-DC switch to AC.
3. Disconnect shorting strap.
4. Connect 0.1 microfarad capacitor to bottom
Figure
red terminal.
5. Connect input signal to A and B.
6. Connect common return to black terminal.
The capacitor must be used to block any de which
would unbalance the input amplifier.
2-5