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FT-1
The Fiber Transmitter FT-1 (shown in Figure 10) is used to provide signals from the user’s signal
generator or control system to trigger the NSP externally in Triggered or External mode.
The FT-1 is a single channel unit that has a 50 Ω terminated BNC input and a fiber optic output. The FT-1
requires a 5 V input gate signal from a source capable of driving the 50 Ω input load to 5 V. The FT-1 is
powered by a 5 V/1 A power supply provided by EHT.
The input trigger signal must be a clean smooth trigger, with no overshoots or oscillations and have a rise
time and fall time of less than 20 ns. Any noise spikes or oscillations on the input trigger may cause
unwanted output trigger signals to be generated, leading to potential false triggering of and damage to the
NSP.
Do not provide any signal to the FT-1 BNC input while the 5 V/1 A power supply is
unplugged, as doing so could damage the internal electronics of the FT-1.
The fiber optic output uses standard 2.2 mm jacketed plastic fiber. The fiber should be cut to length with a
sharp razor (not wire cutters or scissors), and it should have a smooth, clean end. To connect a fiber optic
cable to the Trigger Input on the NSP, loosen the black connector nut, insert the fiber all the way into the
connector, then tighten the black connector nut. Make sure the fiber is fully inserted to avoid
false/improper signaling. The user should feel an obvious stop as the fiber is fully inserted into the
connector. Insert the other end of the fiber into the blue connector nut of the FT-1in the same fashion. Do
not insert or remove fibers with AC power on.
The fiber optic outputs have rise and fall times of less than
5 ns, with a jitter of less than 2 ns. The input-to-output delay is ~30 ns, plus any delay due to the length of
the fiber optic cable. The FT-1 can provide output fiber gate pulses from 4 ns to DC.
More information about the FT-1 can be found at
http://www.eagleharbortech.com/products-new/fiber-
Figure 10.
EHT Fiber Transmitter FT-1
Summary of Contents for NSP Series
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