Atec Agilent-N5183A - Manual (Page 14)

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Internal analog modulation source
(Option UNT)
Waveform
Sine
Rate range 0.1 Hz to 2 MHz (tunable to 3 MHz)
Resolution 0.1 Hz
Frequency accuracy Same as RF reference source (nom)
External modulation inputs
(Requires Option UNT)
Modulation types FM, AM, phase mod, pulse mod
Input impedance 50 Ω (nom)
Simultaneous modulation 1
All modulation types (FM, AM, φM and pulse modulation) may be simultaneously
enabled except: FM and phase modulation can not be combined; two modulation types
can not be simultaneously generated using the same modulation source. For example,
AM and FM can run concurrently and will modulate the output RF. This is useful for
simulating signal impairments.
1. If AM or pulse modulation are on, then phase and FM specifications do not apply.