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281, 282, 284
Users Manual
1-8
Output signal level: TTL/CMOS logic levels from typically 50 Ω
Cursor/Marker Out
Adjustable output pulse for use as a marker in sweep mode or as a cursor in arbitrary
waveform
editing mode. Can be used to modulate the Z-axis of an oscilloscope or be
displayed on a second oscilloscope channel.
Output Signal Level: Adjustable from nominally 2 to 14 V, normal or inverted;
adjustable width as a cursor.
Output Impedance: 600 Ω
typical
Inputs
Trig In
Frequency range: DC to 1 MHz.
Signal range: Threshold nominally
TTL level; max input ±10 V
Minimum pulse width: 50 ns, for trigger and gate modes;
50 µs for sweep m
ode.
Polarity: Selectable as high/risin
g edge or low/falling edge.
Input impedance: 10 kΩ
Modulation In
Frequency range: DC to 100 kHz.
Signal range: VCA: Approximately 1 V
p-p for 100 % level change at
maximum output.
SCM: Approximately ± 1 V pk for maximum output.
Input impedance: Typically 1 kΩ
Sum In
Frequency range: DC to 8 MHz
Signal range: Approximately 2 V p-p input for 20 V p-p output.
Input impedance: Typically 1 kΩ
Hold
Holds an arbitrary waveform at its current position. A
TTL low level or switch closure
causes the waveform to stop at the current position and wait until a TTL high level or
switch opening which allows the waveform to continue. The front panel MAN HOLD
key
or a remote command may also be used to control the hold function. While held the
front panel MAN TRIG key or remote command may be used to return the waveform to
the start. The HOLD input may be enabled independently for each channel.
Input impedance: 10 kΩ
Ref Clock In/Out
Set to input: Input for an external 10MHz reference clock.
TTL/CMOS threshold level.
Set to output: Buffered version of the internal 10 MHz clock.
Output levels nom
inally 1 V and 4 V from 50 Ω
Set to phase lock:
Used together with SYNC OUT on a master and TRIG IN
on a slave to synchronize (phase lock) two separate
generators.
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