Operational Characteristisc of AMT 2 (Figure 254). The ZR II mechanism does not control the switching of plate and heater supply to the "T" component amplifier tubes, since the battery has much longer life than the AT 2 component of AMT 1.

The acoustic component is normally actuated first and switches on the "T" component when actuated. However, the "T" component is blocked by cam switch 6 until 1.5 se-conds after "M" actuation. The mine is then active for "T" firing from 1.5 seconds to 25 seconds after "M" actuation. As in AMT 1, the interval from 90-177 seconds is allowed for resetting of the M 4 unit.

Figure 254 – AMT 1 and AMT 2 Characteristics