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annotate rs_fsp7_noisetest.py @ 56:91b476ebc0f2
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| author | Daniel O'Connor <doconnor@gsoft.com.au> |
|---|---|
| date | Tue, 08 Dec 2020 14:00:45 +1030 |
| parents | 42621291eb9b |
| children | 23c96322cfb6 |
| rev | line source |
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| 46 | 1 #!/usr/bin/env python |
| 2 | |
| 3 # Copyright (c) 2012 | |
| 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 math | |
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29 import numpy |
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30 import optparse |
| 46 | 31 import rsib |
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32 import scipy |
| 46 | 33 import scpi |
| 34 import sys | |
| 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): |
| 46 | 53 # Reset to defaults |
| 54 r.write("*RST") | |
| 55 | |
| 56 # Set to single sweep mode | |
| 57 r.write("INIT:CONT OFF") | |
| 58 | |
| 59 # Enable display updates | |
| 60 r.write("SYST:DISP:UPD ON") | |
| 61 | |
| 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)) |
| 46 | 65 |
| 66 # Switch marker 1 on in screen A | |
| 67 r.write("CALC:MARK1 ON") | |
| 68 | |
| 69 # Enable noise measurement | |
| 70 r.write("CALC:MARK1:FUNC:NOIS ON") | |
| 71 | |
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72 # Turn averaging on |
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73 r.write("AVER:STAT ON") |
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74 |
| 46 | 75 # Set number of sweeps |
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76 r.write("SWE:COUN %d" % (sweeps)) |
| 46 | 77 |
| 78 # Set resolution bandwidth | |
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79 r.write("SENS1:BAND:RES %f Hz" % (bw)) |
| 46 | 80 |
| 81 # Set video bandwidth (10x res BW) | |
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82 r.write("SENS1:BAND:VID %f Hz" % (bw * 10)) |
| 46 | 83 |
| 84 def getnoise(r): | |
| 85 # Trigger the sweep | |
| 86 r.write("INIT;*WAI") | |
| 87 | |
| 88 # Wait for it to be done | |
| 89 r.write("*OPC?") | |
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90 opc = scpi.getdata(r.read(None), int) |
| 46 | 91 #print "OPC - %d" % (opc) |
| 92 assert(opc == 1) | |
| 93 | |
| 94 # Set data format | |
| 95 r.write("FORM:DATA ASC") | |
| 96 | |
| 97 # Read noise value | |
| 98 r.write("CALC:MARK1:FUNC:NOIS:RES?") | |
| 99 data = r.read(10) | |
| 100 #print "Data - " + data | |
| 101 | |
| 102 return float(data) | |
| 103 | |
| 104 def setnoise(r, en): | |
| 105 if en: | |
| 106 val = "ON" | |
| 107 else: | |
| 108 val = "OFF" | |
| 109 r.write("DIAG:SERV:NSO " + val) | |
| 110 | |
| 111 def calcnf(enrdb, offdb, ondb): | |
| 48 | 112 # Not possible but noisy results may result in it happening |
| 46 | 113 if ondb <= offdb: |
| 114 return 0 | |
| 115 ydb = ondb - offdb | |
| 116 y = 10 ** (ydb / 10) | |
| 117 enr = 10 ** (enrdb / 10) | |
| 118 nf = 10 * math.log10(enr / (y - 1)) | |
| 119 return nf | |
| 120 | |
| 121 def donoisetest(r, enr): | |
| 56 | 122 print("Acquiring with noise off..") |
| 46 | 123 setnoise(r, False) |
| 124 off = getnoise(r) | |
| 56 | 125 print("Acquiring with noise on..") |
| 46 | 126 setnoise(r, True) |
| 127 on = getnoise(r) | |
| 128 return off, on, calcnf(enr, off, on) | |
| 129 | |
| 130 if __name__ == '__main__': | |
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131 parser = optparse.OptionParser(usage = '%prog [options] address frequency', |
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132 description = 'Configures a Rhode Schwartz FSP7 spectrum analyser to do a noise figure test', |
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133 epilog = 'video bandwidth is set to 10 times the resolution bandwidth') |
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134 parser.add_option('-s', '--span', dest = 'span', default = 1e6, help = 'Span frequency in Hz (default: %default)', type = float) |
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135 parser.add_option('-i', '--input', dest = 'input', default = None, help = 'Frequency used to compute ENR (defaults to frequency)', type = float) |
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136 parser.add_option('-w', '--sweeps', dest = 'sweeps', default = 20, help = 'Number of sweeps (default: %default)', type = int) |
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137 parser.add_option('-b', '--bw', dest = 'bw', default = 1000, help = 'Resolution bandwidth in Hz (default: %default)', type = float) |
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138 parser.add_option('-r', '--repeat', dest = 'repeat', help = 'Number of repetitions, if not specified do one and ask to continue', type = int) |
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139 |
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140 (options, args) = parser.parse_args() |
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141 |
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142 if len(args) != 2: |
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143 parser.error('Must supply the specan address and centre frequency') |
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144 |
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145 addr = args[0] |
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146 try: |
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147 freq = float(args[1]) |
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148 except ValueError: |
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149 parser.error('Unable to parse frequency') |
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150 |
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151 if options.input == None: |
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152 options.input = freq |
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153 |
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154 # Compute ENR at frequency of interest |
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155 enr = findenr(options.input) |
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156 |
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157 # Connect to the analyser |
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158 r = rsib.RSIBDevice(addr) |
| 46 | 159 |
| 160 # ID instrument | |
| 161 r.write('*IDN?') | |
| 56 | 162 print("ID is " + r.read(5)) |
| 46 | 163 |
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164 # Setup parameters |
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165 setup(r, freq, options.span, options.sweeps, options.bw) |
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166 |
| 46 | 167 r.write("INIT:CONT OFF") |
| 168 | |
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169 nfs = [] |
| 56 | 170 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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171 while options.repeat == None or options.repeat > 0: |
| 46 | 172 off, on, nf = donoisetest(r, enr) |
| 56 | 173 print("Off %.3f dBm/Hz, on %.3f dBm/Hz, NF %.2f dB" % (off, on, nf)) |
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174 nfs.append(nf) |
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175 if options.repeat == None: |
| 56 | 176 print("Press enter to perform a new measurement") |
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177 sys.stdin.readline() |
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178 else: |
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179 options.repeat -= 1 |
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180 |
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181 if len(nfs) > 1: |
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182 nfs = numpy.array(nfs) |
| 56 | 183 print("NF min: %.1f dBm/Hz, max: %.1f dBm/Hz, avg: %.1f dBm/hz, stddev: %.1f" % ( |
| 184 nfs.min(), nfs.max(), nfs.sum() / len(nfs), numpy.std(nfs))) |