All plots are 1.0 V/div vertical scale with 0.60 VDC trigger.

1) A look at 1PPS pulses and pulse width (50R impedance).

Receiver	1 pps (no trigger, 500 ms/div)	Pulse width (see scale)
58503B
CNS II
FireFly

2) A close look at 1PPS risetime (50R impedance).

Receiver	Edge (100 ns/div)	Edge (10 ns/div)
58503B
CNS II
FireFly

3) Same, but using 1M instead of 50R impedance.

Receiver	Edge 1M (100 ns/div)	Edge 1M (10 ns/div)
58503B
CNS II
FireFly