41. GDT Operation & Characteristics

Question.3

The datasheet for the Littelfuse SL1010A090SM GDT (DigiKey part no: F6741TR-ND)specifies:
Nominal Impulse Discharge Current = 5 kA (8/20 µs), 10 shots
What does (8/20 µs) mean?

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The GDT can handle 5 kA for a continuous duration of 8 to 20 microseconds
The surge pulse rises to peak in 8 µs and decays to 50% of peak in 20 µs
The GDT must cool for 8 µs between surges, with a maximum of 20 µs total conduction time
The test uses 8 pulses of 20 µs duration each