Fluke DDS Function Generator 271, User Manual, Page: 27 / 132

Connections
Rear Panel Connections
3
Caution
To avoid risk of damage to the instrument, do not apply
external voltages exc7.5 V or -2.5 V to this input.
VCA IN
VCA IN
is the input socket for external voltage controlled amplitude (VCA). The input
impedance is nominally 6 k Ω . Apply 2
.
5 V for 100% level change at maximum output.
Caution
To avoid risk of damage to the instrument, do not apply
external voltages exceeding ±10 V to this input.
SYNC OUT
When two or more generators are synchronized the
SYNC OUT
socket on the master
generator is connected to the
EXT TRIG
inputs of slave generators.
SYNC OUT
logic levels are nominally 0 V and 5 V from typically 50 Ω .
SYNC OUT
will withstand a short-circuit.
Caution
To avoid risk of damage to the instrument, do not apply
external voltages to this output.
TRIG/SWEEP OUT
The function of this output is automatically determined by the generator's operating
mode.
Except in sweep and hop modes the output is that of the internal trigger generator, a fixed
amplitude square wave whose frequency is set on the
TRIG
or
GATE
menus. The
rising edge of the trigger generator initiates trigger, burst, gate, etc.
In sweep mode the output is a 3-level waveform, changing from high (4 V) to low (0 V)
at start of sweep, with narrow 1 V pulses at each marker point.
In hop mode the output goes low on entry to each waveform step and high after the new
frequency and wave shape of that step have been set.
Output levels are nominally 0 V and 4 V from 1 k
Ω .
TRIG/SWEEP OUT
will withstand
a short-circuit.
Caution
To avoid risk of damage to the instrument, do not apply
external voltages to this output.
3-3
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