annotate specan.py @ 41:df1b4d7e988f

Reword text to be clearer.
author Daniel O'Connor <darius@dons.net.au>
date Wed, 28 Sep 2011 13:35:45 +0930
parents 182c42e7bf03
children c93d6d4cb04b
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1 import exceptions
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2 import numpy
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3 import scpi
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4
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5 class Traceinst(object):
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6 '''Generic class for a trace based instrument'''
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7 attrs = {}
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8 tracetypename = None
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9 tracedtype = None
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10 tracequery = None
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11
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12 def __init__(self, con):
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13 self.con = con
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14 # Set trace format
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15 self.con.write("FORM " + self.tracetypename)
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16
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17 def setconf(self, name, value):
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18 if name not in self.attrs:
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19 raise exceptions.KeyError(name + " not supported")
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20 # Check value is correct type
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21 tmp = self.attrs[name][1](value)
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22 # Run validation function (if necessary)
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23 if self.attrs[name][2] != None:
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24 self.attrs[name][2](value)
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25 #print "Setting %s to %s" % (self.attrs[name][0], str(value))
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26 self.con.write("%s %s" % (self.attrs[name][0], str(value)))
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27
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28 def getconf(self, name):
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29 if name not in self.attrs:
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30 raise exceptions.KeyError(name + " not supported")
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31 self.con.write("%s?" % (self.attrs[name][0]))
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32 r = self.con.read()
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33 return self.attrs[name][1](r)
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34
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35 def write(self, *args):
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36 return self.con.write(*args)
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37
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38 def read(self, *args):
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39 return self.con.read(*args)
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40
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41 def gettrace(self, timeout = 10):
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42 # Trigger the sweep
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43 self.con.write("INIT;*WAI")
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44
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45 # Wait for it to be done
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46 if False:
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47 self.con.write("*OPC?")
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48 opc = scpi.getdata(self.con.read(timeout), int)
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49 if opc != 1:
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50 return None
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51 else:
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52 while True:
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53 self.con.write(':STATus:OPERation?')
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54 i = scpi.getdata(self.con.read(timeout), int)
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55 if i & 256:
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56 break
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57
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58
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59 # Grab trace data
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60 self.con.write(self.tracequery)
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61 dat = self.con.read(10)
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62
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63 # Parse into array
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64 ary = scpi.bindecode(dat, dtype = self.tracedtype)
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65 return ary
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66
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67 def dumpconf(self):
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68 rtn = {}
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69 for k in self.attrs:
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70 self.con.write(self.attrs[k][0] + '?')
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71 res = self.con.read()
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72 #print "Getting " + k + " / " + self.attrs[k][0] + " = " + res
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73 rtn[k] = self.attrs[k][1](res)
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74 return rtn
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75
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76 class RSSPA(Traceinst):
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77 '''Rhode & Schwartz Spectrum Analyzer'''
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78
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79 attrs = { 'fstart' : ['FREQ:START', float, None], # Page 561
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80 'fstop' : ['FREQ:STOP', float, None],
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81 'atten' : ['INP:ATT', float, None], # Page 518
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82 'resbw' : ['SENSE:BANDWIDTH:RESOLUTION', float, None], # Page 539
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83 'vidbw' : ['SENSE:BANDWIDTH:VIDEO', float, None], # Page 541
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84 'sweept' : ['SENSE:SWEEP:TIME', float, None], # Page 599
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85 #'sweeppts' : ['SWEEP:POINTS', int, RSSPA.sweepptscheck],
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86 'sweeppts' : ['SWEEP:POINTS', int, None], # Page 599
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87 'sweepcnt' : ['SENSE1:AVERAGE:COUNT', int, None], # Page 595
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88 'reflev' : ['DISPLAY:WINDOW1:TRACE1:Y:SCALE:RLEVEL', float, None], # Page 506
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89 'detector' : ['SENSE1:DETECTOR1:FUNCTION', str, None] , # Page 552
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90 }
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91
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92 tracetypename = 'REAL,32'
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93 tracedtype = numpy.float32
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94 tracequery = 'TRAC1? TRACE1'
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95 swptslist = [125, 251, 501, 1001, 2001, 4001, 8001]
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96
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97 # def sweepptscheck(npts):
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98 # if x not in RSSPA.swptslist:
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99 # raise exceptions.ValueError("Sweep value not supported, must be one of " + str(RSSPA.swptslist))
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100
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101
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102 class AnSPA(Traceinst):
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103 '''Anritsu Spectrum Analyzer'''
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104 attrs = { 'fstart' : ['FREQ:START', float, None], # Page 26
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105 'fstop' : ['FREQ:STOP', float, None], # Page 26
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106 'atten' : ['SENSE:POWER:ATTENUATION', float, None], # Page 27
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107 'sweept' : ['SENSE:SWEEP:TIME', float, None], # Page 28
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108 'sweepcnt' : [':SENSe:AVERage:COUNt', int, None], # Page 21
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109 'tracemode' : [':SENSe:AVERage:TYPE', str, None], # Page 21
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110 'resbw' : ['SENSE:BANDWIDTH:RESOLUTION', float, None], # Page 22
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111 'vidbw' : ['SENSE:BANDWIDTH:VIDEO', float, None], # Page 23
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112 'reflev' : [':DISPLAY:WIND:TRACE:Y:SCALE:RLEVEL', float, None], # Page 15
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113 'detector' : [':SENSe:DETector:FUNCtion', str, None], # Page 24
31
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114 }
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115
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116 tracetypename = 'REAL,32'
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117 tracedtype = numpy.float32
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118 tracequery = 'TRACE:DATA?'
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119
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120 def getInst(inst):
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121 if inst == "RSSPA":
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122 return RSSPA
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123 elif inst == "AnSPA":
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124 return AnSPA
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125 else:
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126 raise exceptions.NotImplementedError("unknown instrument type " + inst)