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annotate example.py @ 3:62ffab79227e

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Add example.py with pylab plotting example. Tested with the Tek 2024B.
author Daniel O'Connor <darius@dons.net.au>
date Wed, 13 May 2009 17:08:41 +0930
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children 51d1fc44a753
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62ffab79227e Add example.py with pylab plotting example.
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1 #!/usr/bin/env python
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2
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3 import usb488
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4 import matplotlib.pylab as pylab
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5 import numpy
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6 import time
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7
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8 def main():
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9 u = usb488.USB488Device()
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10 print "Found device"
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12 u.write("*IDN?")
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13 print "ID is..",
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14 print u.read()
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16 u.write("DATA:ENC RIB") # Big endian signed
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17 u.write("DATA:WIDTH 2") # 2 bytes wide
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18 u.write("SELECT:CH1 ON") # Turn channel 1 on
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19 u.write("DATA:SOURCE CH1") # Set the curve source to channel 1
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20 u.write("CURVE?") # Ask for the curve data
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21 time.sleep(1) # Wait for the data..
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22 # XXX: need some way of polling
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23 result = u.read()
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24 data = result[13:] # Chop off the header
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25 dattype = numpy.dtype('>h') # Big endian 16 bit quantity
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26 ary = numpy.fromstring(data, dtype = dattype)
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27 pylab.plot(ary)
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28 pylab.show()
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30 if __name__ == "__main__":
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31 main()