Mercurial > ~darius > hgwebdir.cgi > pyinst

annotate fsp7_phasenoise.py @ 80:b280fe3b696a

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author Daniel O'Connor <doconnor@gsoft.com.au>
date Fri, 27 Sep 2024 16:55:01 +0930
parents 23c96322cfb6
children 1947d10f9395
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1 #!/usr/bin/env python
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2
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3 # Copyright (c) 2024
74
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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 numpy
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31 import os
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32 import PIL
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33 import rsib
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34 import scipy
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35 import scpi
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36 import sys
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37 import time
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38
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39 def sifmt(_v, dp = 3, unit = 'Hz', sp = ' '):
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40 '''Format a number using SI prefixes'''
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41 si_prefixes = ('T', 'G', 'M', 'k', '', 'm', 'ยต', 'n', 'p')
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42 scale = 10 ** 12
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43 v = abs(_v)
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44 if v == 0:
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45 sip = ""
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46 scale = 0
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47 for i, sip in enumerate(si_prefixes):
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48 if v >= scale:
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49 break
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50 scale /= 1e3
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51 return ('%.' + str(dp) + 'f%s%s%s') % (_v / scale, sp, si_prefixes[i], unit)
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52
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53 def setupsweep(r, rbw, vbw, centre = None, span = None, start = None, stop = None):
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54 '''Helper function to set various sweep parameters'''
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55 if centre is not None:
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56 r.write('SENSE1:FREQ:CENT %f Hz' % (centre))
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57 if span is not None:
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58 r.write('SENSE1:FREQ:SPAN %f Hz' % (span))
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59 if start is not None:
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60 r.write('SENSE1:FREQ:START %f Hz' % (start))
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61 if stop is not None:
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62 r.write('SENSE1:FREQ:STOP %f Hz' % (stop))
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63 if rbw is not None:
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64 r.write('SENS1:BAND:RES %f Hz' % (rbw))
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65 if vbw is not None:
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66 r.write('SENS1:BAND:VID %f Hz' % (vbw))
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67
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68 def dosweep(r, sweeps):
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69 '''Helper function to trigger a sweep and wait for it to finish'''
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70 swt = float(r.ask('SWE:TIME?'))
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71 tout = swt * 5 * sweeps
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72 if tout < 1:
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73 tout = 1
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74 #print('Sweep time', swt)
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75
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76 # Trigger the sweep
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77 r.write('INIT;*WAI')
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78
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79 # Wait for it to be done
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80 opc = int(r.ask('*OPC?', timeout = tout))
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81 assert(opc == 1)
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82
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83 def findpeaks(r, maxpeak = 5, minpwr = None):
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84 '''Ask instrument to find maxpeaks peaks and return a list of frequencies and powers'''
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85 peaks_f = []
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86 peaks_pwr = []
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87 r.write('CALC:MARK1:MAX')
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88 for i in range(maxpeak):
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89 frq = float(r.ask('CALC:MARK1:X?'))
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90 pwr = float(r.ask('CALC:MARK1:Y?'))
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91 if minpwr is not None and pwr < minpwr:
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92 break
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93 if i > 0:
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94 if frq == peaks_f[i - 1]:
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95 break
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96 peaks_f.append(frq)
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97 peaks_pwr.append(pwr)
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98 r.write('CALC:MARK1:MAX:NEXT')
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99
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100 return peaks_f, peaks_pwr
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101
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102 def phasenoise(r, nominal, sweeps, atten, rlev, yscale, ssprefix):
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103 '''Main function to find a signal, do some phase noise measurements and wideband sweeps'''
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104 cpwrlim = -30
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105 measurements = (
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106 { 'offset' : 10, 'span' : 100, 'rbw' : 10, 'vbw' : 10 },
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107 { 'offset' : 100, 'span' : 250, 'rbw' : 10, 'vbw' : 10 },
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108 { 'offset' : 1e3, 'span' : 2.5e3, 'rbw' : 10, 'vbw' : 30 },
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109 { 'offset' : 10e3, 'span' : 25e3, 'rbw' : 100, 'vbw' : 300 },
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110 { 'offset' : 100e3, 'span' : 250e3, 'rbw' : 100, 'vbw' : 300 },
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111 { 'offset' : 1e6, 'span' : 2.1e6, 'rbw' : 1e3, 'vbw' : 3e3 },
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112 )
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113 # Reset to defaults
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114 r.write('*RST')
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115
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116 # Set to single sweep mode
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117 r.write('INIT:CONT OFF')
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118
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119 # Enable display updates
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120 r.write('SYST:DISP:UPD ON')
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121
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122 # Set attenuation
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123 if atten is None:
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124 r.write('INP:ATT AUTO')
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125 else:
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126 r.write('INP:ATT %s' % atten)
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127
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128 # Set Y scale
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129 if yscale is not None:
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130 r.write('DISP:TRAC:Y %s dB' % (yscale))
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131
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132 # Set reference level
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133 if rlev is None:
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134 r.write('DISP:WIND:TRAC:Y:RLEV AUTO')
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135 else:
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136 r.write('DISP:WIND:TRAC:Y:RLEV %f' % (rlev))
74
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137
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138 #
76
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139 # Look for signal
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140 #
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141 # Set frequency range etc
76
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142 setupsweep(r, 10, 30, centre = nominal, span = 1e3)
74
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143
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144 # Switch marker 1 on in screen A
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145 r.write('CALC:MARK1 ON')
76
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146 print('Looking for signal (%.1f seconds)' % (float(r.ask('SWE:TIME?'))))
74
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147
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148 # Do the sweep
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149 dosweep(r, 1)
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150
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151 # Check the instrument is happy
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152 status = int(r.ask('STAT:QUES:COND?'))
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153 pwrstat = int(r.ask('STAT:QUES:POW:COND?'))
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154 if status != 0 or pwrstat != 0:
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155 print('Instrument warning, status %s power status %s' %
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156 (bin(status), bin(pwrstat)))
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157 # Find the peak
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158 r.write('CALC:MARK1:MAX')
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159 cpwr = float(r.ask('CALC:MARK1:Y?'))
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160 if cpwr < cpwrlim:
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161 Exception('Power too low / not found: %.1f dBm vs %.1f dBm' % (cpwr, cpwrlim))
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162 cmeas = float(r.ask('CALC:MARK1:X?'))
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163 print('Found signal at %s with power %.1f dBm' % (sifmt(cmeas, dp = 6), cpwr))
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164
76
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165 # Centre peak
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166 r.write('CALC:MARK1:FUNC:CENT')
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167
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168 # Set number of sweeps
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169 r.write('SWE:COUN %d' % (sweeps))
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170
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171 # Enable phase noise measurement
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172 r.write('CALC:MARK:AOFF')
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173 r.write('CALC:DELT1:FUNC:PNO')
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174
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175 for idx, m in enumerate(measurements):
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176 # Setup measurement
76
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177 setupsweep(r, m['rbw'], m['vbw'], span = m['span'])
74
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178
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179 # Do the sweep
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180 dosweep(r, sweeps)
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181
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182 # Set offset of phase noise measurement
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183 r.write('CALC:MARK1:MAX')
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184 r.write('CALC:DELT1:MOD REL')
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185 r.write('CALC:DELT1:X %f Hz' % (m['offset']))
74
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186 meas = float(r.ask('CALC:DELT:FUNC:PNO:RES?'))
76
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187 print('Offset %7s %7.2f dBc/Hz' % (sifmt(m['offset'], dp = 0), meas))
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188
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189 # Take screen shot and save it
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190 if ssprefix is not None:
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diff changeset
191 screenshot(r, '%s-%d_%s_offset.png' % (
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diff changeset
192 ssprefix, idx, sifmt(m['offset'], dp = 0, sp = '')))
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193
76
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194 # Do a wide band scan
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195 if ssprefix is not None:
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196 start = 1e6
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197 stop = 100e6
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198 setupsweep(r, 1e3, 3e3, start = start, stop = stop)
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199 print('Scanning %s - %s (%.1f seconds)' % (sifmt(start, dp = 0), sifmt(stop, dp = 0),
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200 float(r.ask('SWE:TIME?'))))
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diff changeset
201 dosweep(r, sweeps)
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202 # Show peaks
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203 r.write('CALC:MARK:AOFF')
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204 for i, (f, p) in enumerate(zip(*findpeaks(r, 4))):
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205 r.write('CALC:MARK%d:X %f Hz' % (i + 1, f))
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diff changeset
206 screenshot(r, '%s-sweep-%.1f-%.1fMHz.png' % (
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diff changeset
207 ssprefix, start / 1e6, stop / 1e6))
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208
76
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209 # Look from just before signal to just after second harmonic
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210 start = nominal * 0.9
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211 stop = 2 * nominal + nominal * 0.1
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diff changeset
212 setupsweep(r, 1e3, 3e3, start = start, stop = stop)
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213 print('Scanning %s - %s (%.1f seconds)' % (sifmt(start, dp = 0), sifmt(stop, dp = 0),
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diff changeset
214 float(r.ask('SWE:TIME?'))))
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diff changeset
215 dosweep(r, sweeps)
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216 # Show peaks
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217 r.write('CALC:MARK:AOFF')
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diff changeset
218 for i, (f, p) in enumerate(zip(*findpeaks(r, 4))):
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diff changeset
219 r.write('CALC:MARK%d:X %f Hz' % (i + 1, f))
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parents: 74
diff changeset
220 screenshot(r, '%s-sweep-%.1f-%.1fMHz.png' % (
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diff changeset
221 ssprefix, start / 1e6, stop / 1e6))
74
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222
76
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diff changeset
223 def screenshot(r, ssname, sapath = '\'c:\\temp\\pntmp.bmp\''):
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224 # Setup & take screen shot
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225 r.write('HCOPY:DEV:LANG1 BMP')
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diff changeset
226 r.write('HCOPY:DEST1 MMEM')
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diff changeset
227 r.write('HCOPY:CMAP:DEF2')
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diff changeset
228 r.write('HCOPY:ITEM:ALL')
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diff changeset
229 r.write('MMEM:NAME %s' % (sapath,))
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diff changeset
230 r.write('HCOPY:IMM1')
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diff changeset
231 time.sleep(5)
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232
76
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233 # Grab it
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234 r.write('MMEM:DATA? %s' % (sapath,))
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diff changeset
235 bmpdat = scpi.getbin(r.read())
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236 bmpname = ssname[0:-4] + '.bmp'
74
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237
76
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238 # Convert to whatever format
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diff changeset
239 open(bmpname, 'wb').write(bmpdat)
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diff changeset
240 img = PIL.Image.open(bmpname)
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Daniel O'Connor <doconnor@gsoft.com.au>
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diff changeset
241 img.save(ssname)
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Daniel O'Connor <doconnor@gsoft.com.au>
parents: 74
diff changeset
242 os.unlink(bmpname)
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diff changeset
243 r.write('MMEM:DEL %s' % (sapath,))
74
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parents:
diff changeset
244
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diff changeset
245 if __name__ == '__main__':
77
23c96322cfb6 Spell Rohde Schwarz correctly.
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diff changeset
246 parser = argparse.ArgumentParser(description = 'Configures a Rohde Schwarz FSP7 spectrum analyser to do a phase noise measurement')
76
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diff changeset
247 parser.add_argument('-a', '--atten', default = None, help = 'Attenuation level (default: autoamatic)')
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diff changeset
248 parser.add_argument('-r', '--rlevel', default = 10, help = 'Reference level (default: %default dBm)', type = float)
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diff changeset
249 parser.add_argument('-s', '--ssprefix', default = None, help = 'Path name to save screenshots to (default: none)', type = str)
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parents: 74
diff changeset
250 parser.add_argument('-w', '--sweeps', default = 1, help = 'Number of sweeps (default: %default)', type = int)
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diff changeset
251 parser.add_argument('-y', '--yscale', default = 120, help = 'Y-scale extent (default: %default dB)', type = float)
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252 parser.add_argument('address', help = 'Address of analyser', type = str)
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253 parser.add_argument('nominal', help = 'Nominal frequency of measurement (Hz)', type = float)
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254
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255 args = parser.parse_args()
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256
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257 # Connect to the analyser
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258 r = rsib.RSIBDevice(args.address)
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259
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260 # ID instrument
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261 print('Device ID is', r.ask('*IDN?').decode('ascii'))
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262
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263 # Do measurements
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264 phasenoise(r, args.nominal, args.sweeps, args.atten, args.rlevel, args.yscale, args.ssprefix)