User`s manual

Interface
Characteristics
BNC Connector
Functions
TTL levels, except for analog output
Outputs
“Output 50/75 Ohm” - analog output 50 Ω or 75 Ω
nominal; or open
“Marker Out”
(This output is parallel-
terminated with 50 Ω nominal)
- marker bits stored with arbitrary
waveforms
- reference frequency
- waveform clock
- a pulse indicating each waveform
repetition
- a level change at the start and the
end of each burst of waveform
repetitions
- frequency change
- phase change
Inputs
“Ref/Sample In” - external reference frequency
(40 MHz maximum)
- trigger source
(i.e., the waveform clock)
“Start Arm In” - start arm (enables waveform
clock for a burst of waveform
repetitions
“Stop Trig/FSK/Gate In” - waveform clock stop (causes the
current waveform repetition to
be the last, until another Start
Arm)
- FSK Input
- waveform clock gate
NOTE: High impedance pulled up to +5 V through 4.7 KΩ resistor.
External source must be able to sink 1 Ma.
Appendix A Agilent E1445A Specifications 459