The following inputs have fixed amplifier parameters:

  • EA (External Arming) is fixed to 1 kΩ impedance and approx. 1.5 V trigger level;
  • ER (External Reference) is fixed to 50 Ω impedance and accepts signals with 0.1 to 5 Vrms amplitude;
  • C (Prescaler input) is fixed to 50 Ω impedance.