Mircea,
You are correct in using a counter. However, there is a way to do what
you want--buffer the counter. The counter uses a 20 MHz clock for its
timing. What you can program the counter to do is every time it
receives a rising edge from the photomultiplier, it will put
the "count" of 20 MHz pulses in a buffer. Therefore, knowing that the
buffer counts are counts of a 20 MHz pulse, you can reconstruct when a
pulse occurred and the amount of time between pulses. From this, you
can generate the data you need.
Mark
In article <8il7cu$h1c$1@nnrp1.deja.com>,
mircea@creol.ucf.edu wrote:
> I want to read the signal from a photomultiplier (TTL signal 3V, 9ns
> wide pulses) and convert the reading into an analog waveform
> proportional to the intensity
of the light incident on the
> photomultiplier.
> The number of pulses given by the photomultiplier unit is directly
> proportional to the intensity of the incident light (which varies more
> or less sinusoidal with a frequency of about 50kHz).
> I have a DAQ PCI-MIO-16E-1, and LabView 5.1.
> I assume I have to use a counter input, to count the number of pulses,
> but I don't know how to convert the output of the counter.vi into an
> analog waveform.
>
> Anybody has a clue?
>
> Than you in advance.
> Mircea
>
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>
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