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annotate fsp7_phasenoise.py @ 82:6ce8ed5ba76d default tip

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Disable phasenoise measurement before doing wide sweeps.
author Daniel O'Connor <doconnor@gsoft.com.au>
date Fri, 27 Sep 2024 17:50:10 +0930
parents 1947d10f9395
children
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1 #!/usr/bin/env python
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2
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3 # Copyright (c) 2024
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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 argparse
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29 import math
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30 import misc
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31 import numpy
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32 import os
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33 import PIL
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34 import rsib
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35 import scipy
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36 import scpi
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37 import sys
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38 import time
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39
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40 def setupsweep(r, rbw, vbw, centre = None, span = None, start = None, stop = None):
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41 '''Helper function to set various sweep parameters'''
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42 if centre is not None:
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43 r.write('SENSE1:FREQ:CENT %f Hz' % (centre))
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44 if span is not None:
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45 r.write('SENSE1:FREQ:SPAN %f Hz' % (span))
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46 if start is not None:
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47 r.write('SENSE1:FREQ:START %f Hz' % (start))
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48 if stop is not None:
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49 r.write('SENSE1:FREQ:STOP %f Hz' % (stop))
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50 if rbw is not None:
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51 # Need to use FFT filters below 10Hz BW
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52 if rbw < 10:
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53 r.write('BAND:TYPE FFT')
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54 else:
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55 r.write('BAND:TYPE NORM')
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56 r.write('SENS1:BAND:RES %f Hz' % (rbw))
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57 if vbw is not None:
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58 r.write('SENS1:BAND:VID %f Hz' % (vbw))
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59
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60 def dosweep(r, sweeps):
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61 '''Helper function to trigger a sweep and wait for it to finish'''
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62 tout = getsweeptime(r) * 5 * sweeps
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63 if tout < 1:
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64 tout = 1
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65 #print('Sweep time', swt)
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66
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67 # Trigger the sweep
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68 r.write('INIT;*WAI')
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69
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70 # Wait for it to be done
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71 opc = int(r.ask('*OPC?', timeout = tout))
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72 assert(opc == 1)
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74 def findpeaks(r, maxpeak = 5, minpwr = None):
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75 '''Ask instrument to find maxpeaks peaks and return a list of frequencies and powers'''
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76 peaks_f = []
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77 peaks_pwr = []
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78 r.write('CALC:MARK1:MAX')
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79 for i in range(maxpeak):
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80 frq = float(r.ask('CALC:MARK1:X?'))
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81 pwr = float(r.ask('CALC:MARK1:Y?'))
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82 if minpwr is not None and pwr < minpwr:
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83 break
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84 if i > 0:
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85 if frq == peaks_f[i - 1]:
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86 break
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87 peaks_f.append(frq)
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88 peaks_pwr.append(pwr)
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89 r.write('CALC:MARK1:MAX:NEXT')
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90
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91 return peaks_f, peaks_pwr
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92
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93 def getsweeptime(r):
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94 '''Return sweep time in seconds'''
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95 # According to the manual SWE:TIME works for both normal and FFT filters
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96 # however in practise it doesn't get a response for FFT ones so we fake it
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97
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98 if r.ask('BAND:TYPE?').decode('ascii') == 'FFT':
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99 return 5
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100 else:
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101 return float(r.ask('SWE:TIME?'))
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102
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103 def phasenoise(r, nominal, sweeps, atten, rlev, yscale, ssprefix):
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104 '''Main function to find a signal, do some phase noise measurements and wideband sweeps'''
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105 cpwrlim = -30
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106 measurements = (
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107 { 'offset' : 10, 'span' : 100, 'rbw' : 1, 'vbw' : 3 },
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108 { 'offset' : 100, 'span' : 250, 'rbw' : 1, 'vbw' : 3 },
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109 { 'offset' : 1e3, 'span' : 2.5e3, 'rbw' : 1, 'vbw' : 3 },
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110 { 'offset' : 10e3, 'span' : 25e3, 'rbw' : 100, 'vbw' : 300 },
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111 { 'offset' : 100e3, 'span' : 250e3, 'rbw' : 100, 'vbw' : 300 },
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112 { 'offset' : 1e6, 'span' : 2.1e6, 'rbw' : 1e3, 'vbw' : 3e3 },
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113 )
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114 # Reset to defaults
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115 r.write('*RST')
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116 r.write('*CLS')
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117
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118 # Set to single sweep mode
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119 r.write('INIT:CONT OFF')
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120
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121 # Enable display updates
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122 r.write('SYST:DISP:UPD ON')
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123
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124 # Set attenuation
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125 if atten is None:
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126 r.write('INP:ATT AUTO')
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127 else:
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128 r.write('INP:ATT %s' % atten)
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129
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130 # Set Y scale
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131 if yscale is not None:
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132 r.write('DISP:TRAC:Y %s dB' % (yscale))
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diff changeset
133
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diff changeset
134 # Set reference level
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135 if rlev is None:
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Daniel O'Connor <doconnor@gsoft.com.au>
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diff changeset
136 r.write('DISP:WIND:TRAC:Y:RLEV AUTO')
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Daniel O'Connor <doconnor@gsoft.com.au>
parents: 74
diff changeset
137 else:
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Daniel O'Connor <doconnor@gsoft.com.au>
parents: 74
diff changeset
138 r.write('DISP:WIND:TRAC:Y:RLEV %f' % (rlev))
74
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diff changeset
139
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Daniel O'Connor <doconnor@gsoft.com.au>
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diff changeset
140 #
81
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diff changeset
141 # Look from 100kHz down to 100Hz to narrow down the exact frequency
74
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diff changeset
142 #
81
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diff changeset
143 found = False
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Daniel O'Connor <doconnor@gsoft.com.au>
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144 cmeas = nominal
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parents: 77
diff changeset
145 for idx, span in enumerate((100e3, 10e3, 1e3, 100)):
1947d10f9395 - Search for signal frequency iteratively to improve accuracy.
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parents: 77
diff changeset
146 setupsweep(r, span / 50, span / 50 * 3, centre = cmeas, span = span)
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parents: 77
diff changeset
147 print('Looking for signal at %s+/-%s (%.1f seconds)' % (
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Daniel O'Connor <doconnor@gsoft.com.au>
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diff changeset
148 misc.sifmt(nominal), misc.sifmt(span, dp = 1),
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Daniel O'Connor <doconnor@gsoft.com.au>
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diff changeset
149 getsweeptime(r)))
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diff changeset
150 # Do the sweep
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diff changeset
151 dosweep(r, 1)
74
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diff changeset
152
81
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diff changeset
153 # Check the instrument is happy
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diff changeset
154 status = int(r.ask('STAT:QUES:COND?'))
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155 pwrstat = int(r.ask('STAT:QUES:POW:COND?'))
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parents: 77
diff changeset
156 if status != 0 or pwrstat != 0:
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Daniel O'Connor <doconnor@gsoft.com.au>
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diff changeset
157 # Dump a screenshot for debugging
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diff changeset
158 screenshot(r, '%s-sweep-inst-warnings.png' % (ssprefix))
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parents: 77
diff changeset
159 raise Exception('Instrument warning, status %s power status %s' %
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diff changeset
160 (bin(status), bin(pwrstat)))
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diff changeset
161 # Find the peak
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162 r.write('CALC:MARK1 ON')
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diff changeset
163 r.write('CALC:MARK1:MAX')
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diff changeset
164 cpwr = float(r.ask('CALC:MARK1:Y?'))
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Daniel O'Connor <doconnor@gsoft.com.au>
parents: 77
diff changeset
165 if cpwr < cpwrlim:
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diff changeset
166 # Dump a screenshot for debugging
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parents: 77
diff changeset
167 screenshot(r, '%s-sweep-no-power.png' % (ssprefix))
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diff changeset
168 raise Exception('Power too low / not found: %.1f dBm vs %.1f dBm' % (cpwr, cpwrlim))
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diff changeset
169 else:
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170 found = True
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diff changeset
171 cmeas = float(r.ask('CALC:MARK1:X?'))
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172 print('Found signal at %s with power %.1f dBm' % (misc.sifmt(cmeas, dp = 6), cpwr))
74
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diff changeset
173
81
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diff changeset
174 if not found:
1947d10f9395 - Search for signal frequency iteratively to improve accuracy.
Daniel O'Connor <doconnor@gsoft.com.au>
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diff changeset
175 print('Unable to find signal')
76
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176 # Centre peak
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diff changeset
177 r.write('CALC:MARK1:FUNC:CENT')
74
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parents:
diff changeset
178
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diff changeset
179 # Set number of sweeps
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180 r.write('SWE:COUN %d' % (sweeps))
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parents:
diff changeset
181
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parents:
diff changeset
182 # Enable phase noise measurement
76
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diff changeset
183 r.write('CALC:MARK:AOFF')
74
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Daniel O'Connor <doconnor@gsoft.com.au>
parents:
diff changeset
184 r.write('CALC:DELT1:FUNC:PNO')
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parents:
diff changeset
185
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Daniel O'Connor <doconnor@gsoft.com.au>
parents:
diff changeset
186 for idx, m in enumerate(measurements):
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parents:
diff changeset
187 # Setup measurement
76
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diff changeset
188 setupsweep(r, m['rbw'], m['vbw'], span = m['span'])
74
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diff changeset
189 # Do the sweep
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parents:
diff changeset
190 dosweep(r, sweeps)
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Daniel O'Connor <doconnor@gsoft.com.au>
parents:
diff changeset
191
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Daniel O'Connor <doconnor@gsoft.com.au>
parents:
diff changeset
192 # Set offset of phase noise measurement
76
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diff changeset
193 r.write('CALC:MARK1:MAX')
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parents: 74
diff changeset
194 r.write('CALC:DELT1:MOD REL')
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diff changeset
195 r.write('CALC:DELT1:X %f Hz' % (m['offset']))
74
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196 meas = float(r.ask('CALC:DELT:FUNC:PNO:RES?'))
81
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diff changeset
197 print('Offset %7s %7.2f dBc/Hz' % (misc.sifmt(m['offset'], dp = 0), meas))
76
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diff changeset
198
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diff changeset
199 # Take screen shot and save it
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diff changeset
200 if ssprefix is not None:
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Daniel O'Connor <doconnor@gsoft.com.au>
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diff changeset
201 screenshot(r, '%s-%d_%s_offset.png' % (
81
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diff changeset
202 ssprefix, idx, misc.sifmt(m['offset'], dp = 0, sp = '')))
74
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parents:
diff changeset
203
82
6ce8ed5ba76d Disable phasenoise measurement before doing wide sweeps.
Daniel O'Connor <doconnor@gsoft.com.au>
parents: 81
diff changeset
204 # Turn off markers (disables phasenoise mode)
6ce8ed5ba76d Disable phasenoise measurement before doing wide sweeps.
Daniel O'Connor <doconnor@gsoft.com.au>
parents: 81
diff changeset
205 r.write('CALC:MARK:AOFF')
6ce8ed5ba76d Disable phasenoise measurement before doing wide sweeps.
Daniel O'Connor <doconnor@gsoft.com.au>
parents: 81
diff changeset
206
76
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parents: 74
diff changeset
207 # Do a wide band scan
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diff changeset
208 if ssprefix is not None:
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Daniel O'Connor <doconnor@gsoft.com.au>
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diff changeset
209 start = 1e6
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diff changeset
210 stop = 100e6
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diff changeset
211 setupsweep(r, 1e3, 3e3, start = start, stop = stop)
81
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parents: 77
diff changeset
212 print('Scanning %s - %s (%.1f seconds)' % (misc.sifmt(start, dp = 0), misc.sifmt(stop, dp = 0),
1947d10f9395 - Search for signal frequency iteratively to improve accuracy.
Daniel O'Connor <doconnor@gsoft.com.au>
parents: 77
diff changeset
213 getsweeptime(r)))
76
e2bb136bd2ed Add script to use FSP7 to perform phasenoise measurements.
Daniel O'Connor <doconnor@gsoft.com.au>
parents: 74
diff changeset
214 dosweep(r, sweeps)
e2bb136bd2ed Add script to use FSP7 to perform phasenoise measurements.
Daniel O'Connor <doconnor@gsoft.com.au>
parents: 74
diff changeset
215 # Show peaks
e2bb136bd2ed Add script to use FSP7 to perform phasenoise measurements.
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parents: 74
diff changeset
216 r.write('CALC:MARK:AOFF')
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Daniel O'Connor <doconnor@gsoft.com.au>
parents: 74
diff changeset
217 for i, (f, p) in enumerate(zip(*findpeaks(r, 4))):
e2bb136bd2ed Add script to use FSP7 to perform phasenoise measurements.
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parents: 74
diff changeset
218 r.write('CALC:MARK%d:X %f Hz' % (i + 1, f))
e2bb136bd2ed Add script to use FSP7 to perform phasenoise measurements.
Daniel O'Connor <doconnor@gsoft.com.au>
parents: 74
diff changeset
219 screenshot(r, '%s-sweep-%.1f-%.1fMHz.png' % (
e2bb136bd2ed Add script to use FSP7 to perform phasenoise measurements.
Daniel O'Connor <doconnor@gsoft.com.au>
parents: 74
diff changeset
220 ssprefix, start / 1e6, stop / 1e6))
74
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Daniel O'Connor <doconnor@gsoft.com.au>
parents:
diff changeset
221
76
e2bb136bd2ed Add script to use FSP7 to perform phasenoise measurements.
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parents: 74
diff changeset
222 # Look from just before signal to just after second harmonic
e2bb136bd2ed Add script to use FSP7 to perform phasenoise measurements.
Daniel O'Connor <doconnor@gsoft.com.au>
parents: 74
diff changeset
223 start = nominal * 0.9
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Daniel O'Connor <doconnor@gsoft.com.au>
parents: 74
diff changeset
224 stop = 2 * nominal + nominal * 0.1
e2bb136bd2ed Add script to use FSP7 to perform phasenoise measurements.
Daniel O'Connor <doconnor@gsoft.com.au>
parents: 74
diff changeset
225 setupsweep(r, 1e3, 3e3, start = start, stop = stop)
81
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parents: 77
diff changeset
226 print('Scanning %s - %s (%.1f seconds)' % (misc.sifmt(start, dp = 0), misc.sifmt(stop, dp = 0),
1947d10f9395 - Search for signal frequency iteratively to improve accuracy.
Daniel O'Connor <doconnor@gsoft.com.au>
parents: 77
diff changeset
227 getsweeptime(r)))
76
e2bb136bd2ed Add script to use FSP7 to perform phasenoise measurements.
Daniel O'Connor <doconnor@gsoft.com.au>
parents: 74
diff changeset
228 dosweep(r, sweeps)
e2bb136bd2ed Add script to use FSP7 to perform phasenoise measurements.
Daniel O'Connor <doconnor@gsoft.com.au>
parents: 74
diff changeset
229 # Show peaks
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diff changeset
230 r.write('CALC:MARK:AOFF')
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Daniel O'Connor <doconnor@gsoft.com.au>
parents: 74
diff changeset
231 for i, (f, p) in enumerate(zip(*findpeaks(r, 4))):
e2bb136bd2ed Add script to use FSP7 to perform phasenoise measurements.
Daniel O'Connor <doconnor@gsoft.com.au>
parents: 74
diff changeset
232 r.write('CALC:MARK%d:X %f Hz' % (i + 1, f))
e2bb136bd2ed Add script to use FSP7 to perform phasenoise measurements.
Daniel O'Connor <doconnor@gsoft.com.au>
parents: 74
diff changeset
233 screenshot(r, '%s-sweep-%.1f-%.1fMHz.png' % (
e2bb136bd2ed Add script to use FSP7 to perform phasenoise measurements.
Daniel O'Connor <doconnor@gsoft.com.au>
parents: 74
diff changeset
234 ssprefix, start / 1e6, stop / 1e6))
74
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Daniel O'Connor <doconnor@gsoft.com.au>
parents:
diff changeset
235
76
e2bb136bd2ed Add script to use FSP7 to perform phasenoise measurements.
Daniel O'Connor <doconnor@gsoft.com.au>
parents: 74
diff changeset
236 def screenshot(r, ssname, sapath = '\'c:\\temp\\pntmp.bmp\''):
e2bb136bd2ed Add script to use FSP7 to perform phasenoise measurements.
Daniel O'Connor <doconnor@gsoft.com.au>
parents: 74
diff changeset
237 # Setup & take screen shot
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Daniel O'Connor <doconnor@gsoft.com.au>
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diff changeset
238 r.write('HCOPY:DEV:LANG1 BMP')
e2bb136bd2ed Add script to use FSP7 to perform phasenoise measurements.
Daniel O'Connor <doconnor@gsoft.com.au>
parents: 74
diff changeset
239 r.write('HCOPY:DEST1 MMEM')
e2bb136bd2ed Add script to use FSP7 to perform phasenoise measurements.
Daniel O'Connor <doconnor@gsoft.com.au>
parents: 74
diff changeset
240 r.write('HCOPY:CMAP:DEF2')
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Daniel O'Connor <doconnor@gsoft.com.au>
parents: 74
diff changeset
241 r.write('HCOPY:ITEM:ALL')
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Daniel O'Connor <doconnor@gsoft.com.au>
parents: 74
diff changeset
242 r.write('MMEM:NAME %s' % (sapath,))
e2bb136bd2ed Add script to use FSP7 to perform phasenoise measurements.
Daniel O'Connor <doconnor@gsoft.com.au>
parents: 74
diff changeset
243 r.write('HCOPY:IMM1')
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Daniel O'Connor <doconnor@gsoft.com.au>
parents: 74
diff changeset
244 time.sleep(5)
74
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Daniel O'Connor <doconnor@gsoft.com.au>
parents:
diff changeset
245
76
e2bb136bd2ed Add script to use FSP7 to perform phasenoise measurements.
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diff changeset
246 # Grab it
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Daniel O'Connor <doconnor@gsoft.com.au>
parents: 74
diff changeset
247 r.write('MMEM:DATA? %s' % (sapath,))
e2bb136bd2ed Add script to use FSP7 to perform phasenoise measurements.
Daniel O'Connor <doconnor@gsoft.com.au>
parents: 74
diff changeset
248 bmpdat = scpi.getbin(r.read())
e2bb136bd2ed Add script to use FSP7 to perform phasenoise measurements.
Daniel O'Connor <doconnor@gsoft.com.au>
parents: 74
diff changeset
249 bmpname = ssname[0:-4] + '.bmp'
74
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Daniel O'Connor <doconnor@gsoft.com.au>
parents:
diff changeset
250
76
e2bb136bd2ed Add script to use FSP7 to perform phasenoise measurements.
Daniel O'Connor <doconnor@gsoft.com.au>
parents: 74
diff changeset
251 # Convert to whatever format
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Daniel O'Connor <doconnor@gsoft.com.au>
parents: 74
diff changeset
252 open(bmpname, 'wb').write(bmpdat)
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Daniel O'Connor <doconnor@gsoft.com.au>
parents: 74
diff changeset
253 img = PIL.Image.open(bmpname)
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Daniel O'Connor <doconnor@gsoft.com.au>
parents: 74
diff changeset
254 img.save(ssname)
e2bb136bd2ed Add script to use FSP7 to perform phasenoise measurements.
Daniel O'Connor <doconnor@gsoft.com.au>
parents: 74
diff changeset
255 os.unlink(bmpname)
e2bb136bd2ed Add script to use FSP7 to perform phasenoise measurements.
Daniel O'Connor <doconnor@gsoft.com.au>
parents: 74
diff changeset
256 r.write('MMEM:DEL %s' % (sapath,))
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257
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258 if __name__ == '__main__':
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259 parser = argparse.ArgumentParser(description = 'Configures a Rohde Schwarz FSP7 spectrum analyser to do a phase noise measurement')
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260 parser.add_argument('-a', '--atten', default = None, help = 'Attenuation level (default: autoamatic)')
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261 parser.add_argument('-r', '--rlevel', default = 10, help = 'Reference level (default: %default dBm)', type = float)
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262 parser.add_argument('-s', '--ssprefix', default = None, help = 'Path name to save screenshots to (default: none)', type = str)
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263 parser.add_argument('-w', '--sweeps', default = 1, help = 'Number of sweeps (default: %default)', type = int)
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264 parser.add_argument('-y', '--yscale', default = 120, help = 'Y-scale extent (default: %default dB)', type = float)
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265 parser.add_argument('address', help = 'Address of analyser', type = str)
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266 parser.add_argument('nominal', help = 'Nominal frequency of measurement (Hz)', type = float)
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267
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268 args = parser.parse_args()
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269
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270 # Connect to the analyser
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271 r = rsib.RSIBDevice(args.address)
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272
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273 # ID instrument
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274 print('Device ID is', r.ask('*IDN?').decode('ascii'))
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275
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276 # Do measurements
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277 phasenoise(r, args.nominal, args.sweeps, args.atten, args.rlevel, args.yscale, args.ssprefix)