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annotate fsp7_phasenoise.py @ 74:b6ebe05f250f

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Add some commentry about what it works with
author Daniel O'Connor <doconnor@gsoft.com.au>
date Wed, 25 Sep 2024 21:10:01 +0930
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children e2bb136bd2ed
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74
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1 #!/usr/bin/env python
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2
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3 # Copyright (c) 2014
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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 rsib
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32 import scipy
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33 import scpi
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34 import sys
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35
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36 def setup2(r, centre, span, rbw, vbw):
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37 r.write('SENSE1:FREQ:CENT %f Hz' % (centre))
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38 r.write('SENSE1:FREQ:SPAN %f Hz' % (span))
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39 r.write('SENS1:BAND:RES %f Hz' % (rbw))
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40 r.write('SENS1:BAND:VID %f Hz' % (vbw))
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41
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42 def dosweep(r, sweeps):
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43 swt = float(r.ask('SWE:TIME?'))
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44 tout = swt * 5 * sweeps
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45 if tout < 1:
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46 tout = 1
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47 #print('Sweep time', swt)
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48
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49 # Trigger the sweep
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50 r.write('INIT;*WAI')
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51
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52 # Wait for it to be done
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53 opc = int(r.ask('*OPC?', timeout = tout))
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54 assert(opc == 1)
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55
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56
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57 def setup(r, carrier, sweeps, rbw, vbw, ofs, atten):
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58 cpwrlim = -30
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59 measurements = (
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60 { 'offset' : 10, 'rbw' : 10, 'vbw' : 10 },
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61 { 'offset' : 100, 'rbw' : 10, 'vbw' : 10 },
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62 { 'offset' : 1e3, 'rbw' : 300, 'vbw' : 300 },
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63 { 'offset' : 10e3, 'rbw' : 300, 'vbw' : 300 },
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64 { 'offset' : 100e3, 'rbw' : 300, 'vbw' : 300 },
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65 { 'offset' : 1e6, 'rbw' : 1e3, 'vbw' : 3e3 },
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66 )
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67 # Reset to defaults
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68 r.write('*RST')
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69
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70 # Set to single sweep mode
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71 r.write('INIT:CONT OFF')
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72
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73 # Enable display updates
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74 r.write('SYST:DISP:UPD ON')
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75
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76 # Set attenuation
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77 r.write('INP:ATT %f' % atten)
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78
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79 #
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80 # Look for carrier
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81 #
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82 print('Measuring carrier')
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83 # Set frequency range etc
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84 setup2(r, carrier, 1e3, 300, 300)
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85
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86 # Switch marker 1 on in screen A
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87 r.write('CALC:MARK1 ON')
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88
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89 # Do the sweep
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90 dosweep(r, 1)
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91
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92 # Check the instrument is happy
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93 status = int(r.ask('STAT:QUES:COND?'))
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94 pwrstat = int(r.ask('STAT:QUES:POW:COND?'))
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95 if status != 0 or pwrstat != 0:
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96 raise Exception('Instrument warning, status %s power status %s' %
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97 (bin(status), bin(pwrstat)))
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98 # Look for the carrier
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99 r.write('CALC:MARK1:MAX')
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100 cpwr = float(r.ask('CALC:MARK1:Y?'))
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101 if cpwr < cpwrlim:
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102 raise Exception('Carrier power too low / not found: %.1f dBm vs %.1f dBm' % (cpwr, cpwrlim))
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103 cmeas = float(r.ask('CALC:MARK1:X?'))
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104 print('Found carrier at %.7f MHz with power %.1f dBm' % (cmeas / 1e6, cpwr))
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105
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106 # Turn averaging on
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107 r.write('AVER:STAT ON')
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108
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109 # Set number of sweeps
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110 r.write('SWE:COUN %d' % (sweeps))
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111
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112 # Enable phase noise measurement
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113 r.write('CALC:DELT1:FUNC:PNO')
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114
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115 for idx, m in enumerate(measurements):
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116 # Setup measurement
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117 setup2(r, carrier, m['offset'] * 2.1, m['rbw'], m['vbw'])
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118
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119 # Do the sweep
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120 dosweep(r, sweeps)
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121
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122 # Set offset of phase noise measurement
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123 r.write('CALC:DELT2:FUNC:FIX:RPO:X %f Hz' % (m['offset']))
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124 meas = float(r.ask('CALC:DELT:FUNC:PNO:RES?'))
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125 print('Offset %.0fHz %.2f dBc/Hz' % (m['offset'], meas))
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126 return
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127
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128 def getphnoise(r):
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129 # Trigger the sweep
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130 r.write('INIT;*WAI')
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131
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132 # Wait for it to be done
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133 opc = int(r.ask('*OPC?', timeout = 1000))
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134 #print 'OPC - %d' % (opc)
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135 assert(opc == 1)
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136
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137 # Set data format
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138 r.write('FORM:DATA ASC')
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139
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140 # Read phase noise value
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141 data = r.ask('CALC:MARK2:FUNC:NOIS:RES?')
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142 #print 'Data - ' + data
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143
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144 return float(data)
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145
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146 if __name__ == '__main__':
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147 parser = argparse.ArgumentParser(description = 'Configures a Rhode Schwartz FSP7 spectrum analyser to do a phase noise measurement')
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148 parser.add_option('-s', '--span', dest = 'span', default = 1e6, help = 'Span frequency in Hz (default: %default)', type = float)
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149 parser.add_option('-w', '--sweeps', dest = 'sweeps', default = 20, help = 'Number of sweeps (default: %default)', type = int)
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150 parser.add_option('-r', '--rbw', dest = 'rbw', default = 1000, help = 'Resolution bandwidth in Hz (default: %default)', type = float)
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151 parser.add_option('-v', '--vbw', dest = 'vbw', default = 3000, help = 'Video bandwidth in Hz (default: %default)', type = float)
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152 parser.add_option('address', '--address', dest = 'address', help = 'Address of analyser', type = str)
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153 parser.add_option('centre', '--centre', dest = 'centreq', help = 'Centre frequency of measurement', type = float)
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154 parser.add_option('offset', '--offset', dest = 'offset', help = 'Offset frequency to take measurement at', type = float)
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155
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156 (options, args) = parser.parse_args()
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157
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158 # Connect to the analyser
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159 r = rsib.RSIBDevice(addr)
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160
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161 # ID instrument
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162 print('ID is', r.ask('*IDN?').decode('ascii'))
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163
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164 # Setup parameters
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165 setup(r, options.centre, options.span, options.sweeps, options.rbw, options.vbw, options.offset)
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166
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167 while True:
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168 print('Centre: %.1f Mhz, Span %.1f Mhz, RBW %.1f kHz, %d sweeps, Offset %.1fkHz: %.2f dBc/Hz' % (
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169 options.centre / 1e6, options.span / 1e6, options.rbw / 1e3, options.sweeps,
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170 options.offset / 1e3, getphnoise(r)))