How do I count digital pulses and convert them to an x-axis unit?

I am a grad student in Chemistry and I have undertaken a project to switch an old spectroscopic instrument from a stepper motor chart recorder to a digital interface.
I am using Labview 7.1.
I just measured the signals coming from the instrument, so I know exactly what I am working with.
I have one constant, 100mV, digital pulse--which was used to drive the stepper motor a set # of wavenumbers for a given amount of pulse. I need to convert this signal to correlate with wavenumbers--on the x-axis of my final waveform graph.
The other signal is an analog signal, up to 250 mV, which is coming from a photomultiplier tube and represents my y-axis of my final waveform graph.
I am using the NI BNC-2110 DAQ board.
Should I design the program based from just the AI Aquire Waveform.vi? Add a Count Events or Time vi. for the digital pulse?
Could anyone give me some hints with my initial setup/layout?

Hints:
Figure out what is the modle number of your DAQ device. I think the model you cited is just a break-out box.
Depending on your hardware you may be able to use the step pulses to clock your A/D conversions.
The number of sample will be the number of steps so all you need is a conversion factor to convert sample count totoal to wavelength.
Others may offer better ideas so stand by.
Ben
Ben Rayner
I am currently active on.. MainStream Preppers
Rayner's Ridge is under construction

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