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281, 282, 284
Users Manual
Introduction
This chapter describes the front- and rear-panel connections and their functions.
Front Panel Connections
MAIN OUT (1 per channel)
MAIN OUT is the 50 Ω output from the channel’s main generator. It provides up to 20 V
p-p into an open circuit or 10 V p-p into a matched 50 Ω load. It can tolerate a short
circuit for 60 seconds.
Caution
To avoid risk of damage to the instrument, do not apply
external voltages to these outputs.
SYNC OUT (1 per channel)
SYNC OUT provides a TTL/CMOS level output which may be set to any of the
following signals from the SYNC OUT screen.
waveform sync A sync marker phase-coincident with the MAIN OUT
waveform of that channel. For standard waveforms, (sine,
cosine, haversine/cosine, square, triangle, sin(x)/x and ramp),
the sync marker is a square wave with a 1:1 duty cycle, the
rising edge at the 0 º phase point and the falling edge at the
180 º phase point. For arbitrary waveforms the sync marker is
a positive pulse coincident with the first few points (addresses)
of the waveform.
position marker When pos’n marker is selected, the instrument generates
a pulse marker pattern for arbitrary waveforms. The pulse
pattern is programmable from the edit waveform menu
on the MODIFY screen.
When the MAIN OUT waveform is a standard waveform
pos'n marker automatically changes to phase zero
which is a narrow (1 clock) pulse output at the start of each
standard waveform cycle.
Burst done Provides a signal during gate or trigger modes which is low
while the waveform is active at the main output, high at all
other times.
Sequence sync Provides a signal which is low during the last cycle of the last
waveform in a sequence, high at all other times.
Trigger Provides a positive going version of the trigger signal.
Internal, external, manual and remote all produce a trigger
sync.
Sweep sync Goes high at the start of the sweep, goes low at the end of the
sweep.
Phase lock Produces a positive edge coincident with the start of the
current waveform. This is used for phase locking instruments.
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