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annotate example.py @ 84:4b4ae555067b

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Use RMS detector and fix the sweep time for more accuracy. Add links to app notes discussing theory. Run forever without pause and print a summary on ctrl-c
author Daniel O'Connor <doconnor@gsoft.com.au>
date Thu, 03 Oct 2024 08:57:10 +0930
parents 4ca9fdf0795a
children
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1 #!/usr/bin/env python
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2
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3 # Copyright (c) 2009
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4 # Daniel O'Connor <darius@dons.net.au>. All rights reserved.
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5 #
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6 # Redistribution and use in source and binary forms, with or without
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7 # modification, are permitted provided that the following conditions
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8 # are met:
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9 # 1. Redistributions of source code must retain the above copyright
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10 # notice, this list of conditions and the following disclaimer.
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11 # 2. Redistributions in binary form must reproduce the above copyright
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12 # notice, this list of conditions and the following disclaimer in the
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13 # documentation and/or other materials provided with the distribution.
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14 #
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15 # THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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16 # ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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17 # IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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18 # ARE DISCLAIMED. IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE
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19 # FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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20 # DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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21 # OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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22 # HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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23 # LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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24 # OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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25 # SUCH DAMAGE.
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26 #
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27
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28 import usb488
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29 import matplotlib.pylab as pylab
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30 import numpy
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31 import time
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32
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33 def main():
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34 u = usb488.USB488Device()
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35 print("Found device")
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36
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37 u.write("*IDN?")
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38 print("IDN reports " + u.read())
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39
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40 u.write("DATA:ENC RIB") # Big endian signed
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41 u.write("DATA:WIDTH 2") # 2 bytes wide
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42 u.write("SELECT:CH1 ON") # Turn channel 1 on
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43 u.write("DATA:SOURCE CH1") # Set the curve source to channel 1
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44
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45 u.write("CH1:SCALE?")
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46 vscale = float(u.read(1).split()[1])
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47 print("Channel 1 scale is %.2f volts/div" % (vscale))
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48 u.write("HOR:MAIN:SCALE?")
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49 hscale = float(u.read(1).split()[1])
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50 print("Horizontal scale is %f sec/div" % (hscale))
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51
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52 u.write("*WAI") # Make sure the previous commands have been
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53 # executed
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54 u.write("CURVE?") # Ask for the curve data
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55 then = time.time()
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56 result = u.read(1.0) # Takes the CRO a while for this
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57 now = time.time()
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58 print("CURVE read took %f milliseconds" % ((now - then) * 1000.0))
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59 data = result[13:] # Chop off the header (should verify this really..)
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60 dattype = numpy.dtype('>h') # Big endian 16 bit quantity
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61 ary = numpy.fromstring(data, dtype = dattype)
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62 ary = ary / 32768.0 * vscale
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63 pylab.plot(ary)
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64 pylab.show()
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65
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66 if __name__ == "__main__":
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67 main()