17
Clocked Pulse Stream Mode
In clock mode, the output of the channel is a steady stream of pulses. You control the pulse duration and the time
between pulses. The input to a clock channel does not affect its output.
The front panel LED
for a clock channel will glow green when the output is low or red when the output is high.
NOTE:
For a high-frequency clock the LED will alternate between red and green
so quickly that it will appear as a continuous pale green, yellow, or orange light.
As mentioned earlier, the LC880 can operate in two clock modes: hi-resolution and low-resolution (see
General
Settings: Clock
). In hi-res mode, the clock pulse and duration can range from 0.64 µs to 52.4 ms in increments of
160 ns. In low-res mode, pulse and duration can range from 30.1 µs to 3.35 s in increments of 10.24 µs. Trigger
automatically rounds entries to the nearest allowed setting.
To set the pulse duration, select the timing units (seconds, microseconds, milliseconds or nanoseconds) from the
pop-up, then enter the duration in the “Clock high duration” box.
To set the time between pulses, select the units, then enter the duration in the “Clock low duration” box.
A clock’s quiescent state is normally low (See
Channel Properties: Quiescent States
). Check the “Inverted output”
box if the quiescent state for the channel should be high instead.
NOTE:
In the normal clock state, a high input turns the clock on and a low input
turns it off. If the “Inverted output” box is checked, a low input turns the clock on
and a high input turns it off.
Содержание LC880
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