Document ID: chunk:federal_register_of_legislation:F2024L01024:front:0:p151
Version: federal_register_of_legislation:F2024L01024
Segment Type: other
Provision Reference: 
Character Range: 441081–443702

to a spark gap, having all of the following characteristics:
1. Containing three or more electrodes;
2. Anode peak voltage rating of 2.5 kV or more;
3. Anode peak current rating of 100 A or more; and
4. Anode delay time of 10 µs or less;
Note: 3A228 includes gas krytron tubes and vacuum sprytron tubes.
3. A. 228. b. Triggered spark‑gaps having both of the following characteristics:
3. A. 228. b. 1. An anode delay time of 15 µs or less; and
2. Rated for a peak current of 500 A or more;
3. A. 228. c. Modules or assemblies with a fast switching function, other than those specified by 3A001.g. or 3A001.h., having all of the following characteristics:
1. Anode peak voltage rating greater than 2 kV;
2. Anode peak current rating of 500 A or more; and
3. Turn‑on time of 1 µs or less.
3. A. 229. High‑current pulse generators as follows:
N.B.: SEE ALSO MUNITIONS LIST.
N.B.: See 1A007.a. for explosive detonator firing sets.
a. Not used;
b. Modular electrical pulse generators (pulsers) having all of the following characteristics:
1. Designed for portable, mobile, or ruggedised‑use;
2. Not used;
3. Capable of delivering their energy in less than 15 µs into loads of less than 40 ohms;
4. Having an output greater than 100 A;
5. Not used;
6. No dimension greater than 300 mm;
7. Weight less than 30 kg; and
8. Specified for use over an extended temperature range 223 K (‑50oC) to 373 K (100oC) or specified as suitable for aerospace applications.
          c.  Micro‑firing units having all of the following characteristics:
1. No dimension greater than 35 mm;
2. Voltage rating of equal to or greater than 1 kV; and
3. Capacitance of equal to or greater than 100 nF.
Note: 3A229.b. includes xenon flash‑lamp drivers.
3. A. 230. High‑speed pulse generators and pulse heads therefor, having both of the following characteristics:
a. Output voltage greater than 6 V into a resistive load of less than 55 ohms; and
b. 'Pulse transition time' less than 500 ps.
Technical Notes:
1.  In 3A230.b. 'pulse transition time' is defined as the time interval between 10% and 90% voltage amplitude.
2.  Pulse heads are impulse forming networks designed to accept a voltage step function and shape it into a variety of pulse forms that can include rectangular, triangular, step, impulse, exponential, or monocycle types. Pulse heads can be an integral part of the pulse generator, they can be a plug‑in module to the device or they can be an externally connected device.
3. A. 231. Neutron generator systems, including tubes, having both of the following characteristics:
a. Designed for operation without an external vacuum system;