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Chapter 1 3
Signal Generator Overview
Signal Generator Models and Features
E8257C PSG Analog Signal Generator Features
An E8257C PSG analog signal generator provides all the functionality of an E8247C PSG CW signal
generator and adds the following features:
• open-loop or closed-loop AM
• dc-synthesized FM to 10 MHz rates; maximum deviation depends on the carrier frequency
• phase modulation (ΦM)
• pulse modulation
• external modulation inputs for AM, FM, ΦM, and pulse
• simultaneous modulation configurations (except: FM with ΦM or Linear AM with Exponential AM)
• an internal pulse generator that includes the following:
— selectable pulse modes: internal square, internal free-run, internal triggered, internal doublet, internal
gated, and external pulse; internal triggered, internal doublet, and internal gated require an
external trigger source
— adjustable pulse rate
— adjustable pulse period
— adjustable pulse width
— adjustable pulse delay
— selectable external pulse triggering: positive or negative
• dual function generators that includes the following:
—50Ω low frequency output, 0 to 3V
p
, available through LF OUTPUT
— selectable waveforms: sine, dual-sine, swept-sine, triangle, positive ramp, negative ramp, square,
uniform noise, Gaussian noise, and dc
— adjustable frequency modulation rates
— selectable triggering in list and step sweep modes: free run (auto), trigger key (single), bus (remote),
and external