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Add example code to configure a Rigol DSG815 for a frequency sweep
author Daniel O'Connor <doconnor@gsoft.com.au>
date Tue, 19 Jan 2021 17:32:57 +1030
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children 7386f2888508
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1 #!/usr/bin/env python
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2
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3 # Copyright (c) 2021
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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 usb
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29 import usb488
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30
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31 #
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32 # Tested with a Rigol DSG815 connected via USB
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33 #
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34
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35 def main():
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36 u = usb488.USB488Device()
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37 print('Found device')
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38
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39 setup(u)
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40
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41 def freqsetup(u, swstart, swstop, swpoints, swoffset, swlevel):
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42 '''Setup a frequency sweep'''
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43
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44 res = u.ask('*IDN?')
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45 print('Device ID: ' + res)
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46
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47 # Output off
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48 wrcheck(u, ':OUTP:STATE', 'OFF')
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49 # XXX: Most of these work with :SOUR prefixed but :SWE:POIN:TRIG:TYPE does not
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50 # Single sweep
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51 wrcheck(u, ':SWE:MODE', 'SING')
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52 # Frequency sweep
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53 wrcheck(u, ':SWE:STATE', 'FREQ')
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54 # Step (not list)
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55 wrcheck(u, ':SWE:TYPE', 'STEP')
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56 # In single sweep so it starts when SOU:SWE:EXE is sent
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57 wrcheck(u, ':SWE:SWE:TRIG:TYPE', 'AUTO')
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58 # Sweep a point every external trigger
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59 wrcheck(u, ':SWE:POIN:TRIG:TYPE', 'EXT')
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60 # Sweep up
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61 wrcheck(u, ':SWE:DIR', 'FWD')
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62 # Ramp (vs triangle)
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63 wrcheck(u, ':SWE:STEP:SHAP', 'RAMP')
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64 # Linear sweep
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65 wrcheck(u, ':SWE:STEP:SPAC', 'LIN')
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66 # Start/stop/points in sweep
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67 wrcheck(u, ':SWE:STEP:STAR:FREQ', '%fHz' % (swstart + swoffset,))
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68 wrcheck(u, ':SWE:STEP:STOP:FREQ', '%fHz' % (swstop + swoffset,))
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69 wrcheck(u, ':SWE:STEP:POIN', '%d' % (swpoints,))
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70 # Output level
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71 wrcheck(u, ':SWE:STEP:STAR:LEV', '%fdBm' % (swlevel,))
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72 wrcheck(u, ':SWE:STEP:STOP:LEV', '%fdBm' % (swlevel,))
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73 wrcheck(u, ':LEV', '%fdBm' % (swlevel,))
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74
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75 def arm(u):
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76 # Output on
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77 wrcheck(u, ':OUTP:STATE', 'ON')
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78 # Arm it
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79 u.chkcmd(':SWE:EXEC')
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80
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81 def wrcheck(u, name, value):
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82 '''Helper function to set a value then read it back and print it out'''
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83 u.chkcmd(name + ' ' + value)
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84 readval = u.ask(name + '?')
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85 print(name + ' -> ' + readval + ' (' + value + ')')
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86
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87 if __name__ == '__main__':
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88 main()