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Dynamically-Delayed Pulse Mode
The dynamic delay is the LC880’s
piece de resistance
. First, it measures the time difference between two pulses, like
a counter. Next, it scales that difference by a user-defined factor. It subtracts an offset value, waits the duration of the
dynamically calculated delay, then sends a pulse to the channel output.
NOTE:
The dynamic delay is particularly useful for ballistics or gas dynamics
experiments, in which the velocity of a projectile or wave must be calculated
and used to time the triggering of an experimental device.
The Dynamically Delayed pulse includes several properties tabs.
Scaling
In the calculation of the delay, the measured delay between two pulses is scaled by a factor of 2
N
, where –16 < N <
16, or N/16, where 0< N < 256. The former scaling is faster and a scaling of 1:1 is fastest. Scaling can typically be
done at rates > 50 kHz.
The maximum delay between input pulses is 52 ms in hi-res mode (100 MHz) and 3.3 s in low-res mode (100/64).
The maximum delay resulting from the scaling and offset calculations is respectively 21.47 s and 1374 s in hi-res and
low-res modes. Negative calculated delays work correctly only in acausal universes.
Summary of Contents for LC880
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