merge with wip branch

frappy_psi/ls340res.py

@@ -0,0 +1,45 @@
+#!/usr/bin/env python
+#  -*- coding: utf-8 -*-
+# *****************************************************************************
+# This program is free software; you can redistribute it and/or modify it under
+# the terms of the GNU General Public License as published by the Free Software
+# Foundation; either version 2 of the License, or (at your option) any later
+# version.
+#
+# This program is distributed in the hope that it will be useful, but WITHOUT
+# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+# FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
+# details.
+#
+# You should have received a copy of the GNU General Public License along with
+# this program; if not, write to the Free Software Foundation, Inc.,
+# 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+#
+# Module authors:
+#   Markus Zolliker <markus.zolliker@psi.ch>
+# *****************************************************************************
+"""very simple LakeShore Model 340 driver, resistivity only"""
+
+import time
+
+from frappy.datatypes import StringType, FloatRange
+from frappy.modules import Parameter, Property, Readable
+from frappy.io import HasIO, StringIO
+
+
+class LscIO(StringIO):
+    identification = [('*IDN?', 'LSCI,MODEL340,.*')]
+    end_of_line = '\r'
+    wait_before = 0.05
+
+
+class ResChannel(HasIO, Readable):
+    """temperature channel on Lakeshore 340"""
+
+    ioClass = LscIO
+
+    value = Parameter(datatype=FloatRange(unit='Ohm'))
+    channel = Property('the channel A,B,C or D', StringType())
+
+    def read_value(self):
+        return float(self.communicate('SRDG?%s' % self.channel))