RS SGS100A driver (#817)

* SGS100A Driver

Adding parameter to SGS100A driver to allow on/off of IQ modulation.

* Change parameter name

Forgot to change a few lines in previous commit.

* Strip trailing whitespace

* remove .DS_Store files

* Ignore DS_Store

.gitignore

@@ -79,4 +79,7 @@ tmp/
 
 docs/examples/data/*
 
-.idea/
+.idea/
+
+# Mac files
+.DS_Store

qcodes/instrument_drivers/rohde_schwarz/SGS100A.py

@@ -56,6 +56,11 @@ def __init__(self, name, address, **kwargs):
  set_cmd=self.set_status,
  get_parser=self.parse_on_off,
  vals=vals.Strings())
+ self.add_parameter('IQ_state',
+ get_cmd=':IQ:STAT?',
+ set_cmd=self.set_IQ_state,
+ get_parser=self.parse_on_off,
+ vals=vals.Strings())
  self.add_parameter('pulsemod_state',
  get_cmd=':SOUR:PULM:STAT?',
  set_cmd=self.set_pulsemod_state,
@@ -102,6 +107,13 @@ def set_status(self, stat):
  raise ValueError('Unable to set status to %s, ' % stat +
  'expected "ON" or "OFF"')
 
+ def set_IQ_state(self, stat):
+ if stat.upper() in ('ON', 'OFF'):
+ self.write(':IQ:STAT %s' % stat)
+ else:
+ raise ValueError('Unable to set status to %s, ' % stat +
+ 'expected "ON" or "OFF"')
+
  def set_pulsemod_state(self, stat):
  if stat.upper() in ('ON', 'OFF'):
  self.write(':PULM:SOUR EXT')