annotate rs_fsp7_noisetest.py @ 51:03b06d71f0fd

Allow bandwith to be set (maintains a 10:1 ratio of vid:res BW)
author Daniel O'Connor <doconnor@gsoft.com.au>
date Thu, 21 Mar 2013 11:11:10 +1030
parents d143ef509fb7
children c1891d9074c1
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1 #!/usr/bin/env python
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2
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3 # Copyright (c) 2012
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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 math
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29 import numpy
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30 import optparse
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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 findenr(frq):
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37 # ENR values from the noise source
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38 enrdb = numpy.array([15.55, 15.96, 15.68, 15.11, 15.07, 14.84, 14.77, 14.82, 14.86, 14.79, 14.83, 14.93, 14.93, 15.07, 15.19, 15.08, 15.14, 14.87, 14.97, 14.59])
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39 enrfrq = numpy.array([0.01e9, 0.1e9, 1.0e9, 2.0e9, 3.0e9, 4.0e9, 5.0e9, 6.0e9, 7.0e9, 8.0e9, 9.0e9, 10.0e9, 11.0e9, 12.0e9, 13.0e9, 14.0e9, 15.0e9, 16.0e9, 17.0e9, 18.0e9])
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40
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41 # Convert back to linear values
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42 enr = 10 ** (enrdb / 10)
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43
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44 # Interpolate
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45 rtn = scipy.interp([frq], enrfrq, enr)
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46
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47 # Convert to dB
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48 rtndb = 10 * math.log10(rtn)
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49
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50 return rtndb
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51
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52 def setup(r, freq, span, sweeps, bw):
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53 # Reset to defaults
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54 r.write("*RST")
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55
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56 # Set to single sweep mode
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57 r.write("INIT:CONT OFF")
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58
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59 # Enable display updates
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60 r.write("SYST:DISP:UPD ON")
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61
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62 # Set frequency range
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63 r.write("SENSE1:FREQ:CENT %f Hz" % (freq))
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64 r.write("SENSE1:FREQ:SPAN %f Hz" % (span))
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65
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66 # Switch marker 1 on in screen A
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67 r.write("CALC:MARK1 ON")
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68
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69 # Enable noise measurement
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70 r.write("CALC:MARK1:FUNC:NOIS ON")
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71
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72 # Turn averaging on
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73 r.write("AVER:STAT ON")
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74
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75 # Set number of sweeps
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76 r.write("SWE:COUN %d" % (sweeps))
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77
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78 # Set resolution bandwidth
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79 r.write("SENS1:BAND:RES %f Hz" % (bw))
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80
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81 # Set video bandwidth (10x res BW)
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82 r.write("SENS1:BAND:VID %f Hz" % (bw * 10))
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83
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84 def getnoise(r):
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85 # Trigger the sweep
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86 r.write("INIT;*WAI")
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87
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88 # Wait for it to be done
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89 r.write("*OPC?")
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90 opc = scpi.getdata(r.read(None), int)
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91 #print "OPC - %d" % (opc)
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92 assert(opc == 1)
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93
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94 # Set data format
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95 r.write("FORM:DATA ASC")
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96
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97 # Read noise value
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98 r.write("CALC:MARK1:FUNC:NOIS:RES?")
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99 data = r.read(10)
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100 #print "Data - " + data
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101
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102 return float(data)
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103
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104 def setnoise(r, en):
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105 if en:
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106 val = "ON"
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107 else:
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108 val = "OFF"
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109 r.write("DIAG:SERV:NSO " + val)
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110
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111 def calcnf(enrdb, offdb, ondb):
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112 # Not possible but noisy results may result in it happening
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113 if ondb <= offdb:
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114 return 0
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115 ydb = ondb - offdb
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116 y = 10 ** (ydb / 10)
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117 enr = 10 ** (enrdb / 10)
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118 nf = 10 * math.log10(enr / (y - 1))
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119 return nf
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120
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121 def donoisetest(r, enr):
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122 print "Acquiring with noise off.."
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123 setnoise(r, False)
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124 off = getnoise(r)
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125 print "Acquiring with noise on.."
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126 setnoise(r, True)
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127 on = getnoise(r)
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128 return off, on, calcnf(enr, off, on)
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129
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130 if __name__ == '__main__':
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131 parser = optparse.OptionParser(usage = '%prog [options] address frequency')
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132 parser.add_option('-s', '--span', dest = 'span', default = 1e6, help = 'Span frequency (Hz)', type = float)
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133 parser.add_option('-i', '--input', dest = 'input', default = None, help = 'Input frequency (Hz) for down converters', type = float)
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134 parser.add_option('-w', '--sweeps', dest = 'sweeps', default = 20, help = 'Number of sweeps', type = int)
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135 parser.add_option('-b', '--bw', dest = 'bw', default = 1000, help = 'Bandwidth (Hz)', type = float)
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136
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137 (options, args) = parser.parse_args()
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138
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139 if len(args) != 2:
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140 parser.error('Must supply the specan address and centre frequency')
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141
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142 addr = args[0]
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143 try:
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144 freq = float(args[1])
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145 except ValueError:
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146 parser.error('Unable to parse frequency')
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147
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148 if options.input == None:
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149 options.input = freq
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150
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151 # Compute ENR at frequency of interest
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152 enr = findenr(options.input)
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153
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154 # Connect to the analyser
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155 r = rsib.RSIBDevice(addr)
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156
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157 # ID instrument
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158 r.write('*IDN?')
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159 print "ID is " + r.read(5)
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160
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161 # Setup parameters
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162 setup(r, freq, options.span, options.sweeps, options.bw)
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163
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164 r.write("INIT:CONT OFF")
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165
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166 print "Centre: %.1f Mhz, Span %.1f Mhz, Input %.1f MHz, BW %.1f kHz, %d sweeps, ENR %.2f dB" % (freq / 1e6, options.span / 1e6, options.input / 1e6, options.bw / 1e3, options.sweeps, enr)
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167 while True:
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168 off, on, nf = donoisetest(r, enr)
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169 print "Off %.3f dBm/Hz, on %.3f dBm/Hz, NF %.2f dB" % (off, on, nf)
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170 print "Press enter to perform a new measurement"
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171 sys.stdin.readline()
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172