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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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67:98b9258c75b6 68:f95db5ea2fe1
1 #!/usr/bin/env python
2
3 # Copyright (c) 2021
4 # Daniel O'Connor <darius@dons.net.au>. All rights reserved.
5 #
6 # Redistribution and use in source and binary forms, with or without
7 # modification, are permitted provided that the following conditions
8 # are met:
9 # 1. Redistributions of source code must retain the above copyright
10 # notice, this list of conditions and the following disclaimer.
11 # 2. Redistributions in binary form must reproduce the above copyright
12 # notice, this list of conditions and the following disclaimer in the
13 # documentation and/or other materials provided with the distribution.
14 #
15 # THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS ``AS IS'' AND
16 # ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 # IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18 # ARE DISCLAIMED. IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE
19 # FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 # DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21 # OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22 # HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23 # LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24 # OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
25 # SUCH DAMAGE.
26 #
27
28 import usb
29 import usb488
30
31 #
32 # Tested with a Rigol DSG815 connected via USB
33 #
34
35 def main():
36 u = usb488.USB488Device()
37 print('Found device')
38
39 setup(u)
40
41 def freqsetup(u, swstart, swstop, swpoints, swoffset, swlevel):
42 '''Setup a frequency sweep'''
43
44 res = u.ask('*IDN?')
45 print('Device ID: ' + res)
46
47 # Output off
48 wrcheck(u, ':OUTP:STATE', 'OFF')
49 # XXX: Most of these work with :SOUR prefixed but :SWE:POIN:TRIG:TYPE does not
50 # Single sweep
51 wrcheck(u, ':SWE:MODE', 'SING')
52 # Frequency sweep
53 wrcheck(u, ':SWE:STATE', 'FREQ')
54 # Step (not list)
55 wrcheck(u, ':SWE:TYPE', 'STEP')
56 # In single sweep so it starts when SOU:SWE:EXE is sent
57 wrcheck(u, ':SWE:SWE:TRIG:TYPE', 'AUTO')
58 # Sweep a point every external trigger
59 wrcheck(u, ':SWE:POIN:TRIG:TYPE', 'EXT')
60 # Sweep up
61 wrcheck(u, ':SWE:DIR', 'FWD')
62 # Ramp (vs triangle)
63 wrcheck(u, ':SWE:STEP:SHAP', 'RAMP')
64 # Linear sweep
65 wrcheck(u, ':SWE:STEP:SPAC', 'LIN')
66 # Start/stop/points in sweep
67 wrcheck(u, ':SWE:STEP:STAR:FREQ', '%fHz' % (swstart + swoffset,))
68 wrcheck(u, ':SWE:STEP:STOP:FREQ', '%fHz' % (swstop + swoffset,))
69 wrcheck(u, ':SWE:STEP:POIN', '%d' % (swpoints,))
70 # Output level
71 wrcheck(u, ':SWE:STEP:STAR:LEV', '%fdBm' % (swlevel,))
72 wrcheck(u, ':SWE:STEP:STOP:LEV', '%fdBm' % (swlevel,))
73 wrcheck(u, ':LEV', '%fdBm' % (swlevel,))
74
75 def arm(u):
76 # Output on
77 wrcheck(u, ':OUTP:STATE', 'ON')
78 # Arm it
79 u.chkcmd(':SWE:EXEC')
80
81 def wrcheck(u, name, value):
82 '''Helper function to set a value then read it back and print it out'''
83 u.chkcmd(name + ' ' + value)
84 readval = u.ask(name + '?')
85 print(name + ' -> ' + readval + ' (' + value + ')')
86
87 if __name__ == '__main__':
88 main()