First, an overview of what I'm doing: I've recently workedout
hardware-timed counting of ttl pulses (from a photon counter) with
short integration times (~1ms). Now I would like to include
raster-scanning of a 2-D piezo stage while collecting TTL pulses.
I did this a while back using software timing for >10ms integration
times, but now I would like to speed things up. I have a pair of
pci-6014's to work with, and am doing everything with DAQmx and
LabView.
The attached file raster_scan_ishapiro.vi is the scanning excerpt from
my full Labview vi, rasterscan_v3.vi. The full vi includes
synchronized hardware-timed buffered pulse counting. I use a
pulsetrain generated by dev1/ctr0 and physically routed to dev2/PFI0 to
time the counting by dev2/ctr0 and dev2/ctr1. To do the fast-axis
scanning, I am also using the pulsetrain to time Dev2/ao0.
Dev2/ao0 voltage output presently consists of a "Analog 1D DBL, 1Chan
NSamp", and the data is a 1-D array of linearly-spaced voltage values
(generated by the sub-vi create_fast_axis_waveform_ishapiro.vi).
When I run this vi I don't see any errors. The problem is that
the fast axis does not appear to scan. Even if I slow down the
dwell time so that the motion of the peizo stage will be visible
(through a microscope), I only see the slow axis stepping through
a series of points. All the images I've collected also indicate
that the fast axis is stationary. I've racked my brain over this
one for a while now and can't figure out the problem.
Can anyone tell me what's wrong with the way I've set up my hardware-timed analog output?
