1PPS Output

Signal: One pulse-per-second square wave (ext. reference connected to GNSS receiver)

Signal level: TTL compatible, 4.3 V minimum, base-to-peak into 50 Ω

Pulse width: Configurable pulse width (200 ms by default)

Pulse width range: 20 ns to 900 ms

Rise time: <10 ns

Accuracy: Positive edge within ±50 ns of UTC when locked to a valid 1PPS input reference

Connector: BNC female

1PPS output accuracies

Oscillator Type	Accuracy to UTC (1 sigma locked to GPS)	Holdover (constant temp. after 2 weeks of GPS lock)
		After 4 hours	After 24 hours
Low-phase noise Rubidium	±25 ns	0.2 μs	1μs
Rubidium	±25 ns	0.2 μs	1μs
Low-phase noise OCXO	±25 ns	0.5 μs	10 μs
OCXO	±50 ns	1μs	25 μs
TCXO	±50 ns	12 μs	450 μs