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annotate tek2024b_example.py @ 79:84f96c5fe791

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Use different message ID that does not result in "Query UNTERMINATE" messages in the error log. Fix testsrq. Rename queryrsb to querystb as that matches the operating manual.
author Daniel O'Connor <doconnor@gsoft.com.au>
date Fri, 27 Sep 2024 16:53:43 +0930
parents 91b476ebc0f2
children
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1 #!/usr/bin/env python
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2
7
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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 matplotlib.pylab as pylab
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29 import numpy
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30 import scpi
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31 import time
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32 import usb488
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33
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34 def test(u):
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35 u.write("*IDN?")
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36 print("IDN reports " + u.read())
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38 # Set data format to 16 bit big endian signed
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39 u.write("DATA:ENC RIB")
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40 u.write("DATA:WIDTH 2")
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41
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42 # Turn channel 1 on
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43 u.write("SELECT:CH1 ON")
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44
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45 # Set the curve source to channel 1
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46 u.write("DATA:SOURCE CH1")
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47
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48 # Fetch channel scale
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49 u.write("CH1:SCALE?")
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50 vscale = float(u.read(1).split()[1])
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51 print("Channel 1 scale is %.2f volts/div" % (vscale))
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52
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53 # Fetch horizontal scale
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54 u.write("HOR:MAIN:SCALE?")
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55 hscale = scpi.getdata(u.read())
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56 print("Horizontal scale is %f nsec/div" % (hscale * 1e9))
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58 # Make sure the previous commands have been executed
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59 u.write("*WAI")
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60
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61 # Fetch curve data (wait up to 1 second) since the read takes a little while
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62 u.write("CURVE?")
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63 then = time.time()
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64 result = u.read(1.0)
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65 now = time.time()
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66 print("CURVE read took %f milliseconds" % ((now - then) * 1000.0))
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68 # Parse data
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69 ary = scpi.bindecode(result, dtype = numpy.dtype('>h'))
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71 # Convert to volts
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72 ary = ary / 32768.0 * vscale
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74 # Plot data
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75 pylab.plot(ary)
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76 pylab.show()
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78 if __name__ == "__main__":
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79 u = usb488.USB488Device()
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80 print("Found device")
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82 test(u)