diff tek2024b_example.py @ 16:c2c13d804fce

Rename examples, rework them to be clearer and use helper functions.
author Daniel O'Connor <darius@dons.net.au>
date Wed, 10 Aug 2011 12:51:07 +0930
parents example.py@813e183cfd49
children 9bb8a9f3df6b
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line diff
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/tek2024b_example.py	Wed Aug 10 12:51:07 2011 +0930
@@ -0,0 +1,82 @@
+#!/usr/bin/env python
+
+# Copyright (c) 2009
+#      Daniel O'Connor <darius@dons.net.au>.  All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions
+# are met:
+# 1. Redistributions of source code must retain the above copyright
+#    notice, this list of conditions and the following disclaimer.
+# 2. Redistributions in binary form must reproduce the above copyright
+#    notice, this list of conditions and the following disclaimer in the
+#    documentation and/or other materials provided with the distribution.
+#
+# THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+# ARE DISCLAIMED.  IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE
+# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+# SUCH DAMAGE.
+#
+
+import matplotlib.pylab as pylab
+import numpy
+import scpi
+import time
+import usb488
+
+def test(u):
+    u.write("*IDN?")
+    print "IDN reports " + u.read()
+    
+    # Set data format to 16 bit big endian signed
+    u.write("DATA:ENC RIB")
+    u.write("DATA:WIDTH 2")
+
+    # Turn channel 1 on
+    u.write("SELECT:CH1 ON")
+
+    # Set the curve source to channel 1
+    u.write("DATA:SOURCE CH1")
+
+    # Fetch channel scale
+    u.write("CH1:SCALE?")
+    vscale = float(u.read(1).split()[1])
+    print "Channel 1 scale is %.2f volts/div" % (vscale)
+
+    # Fetch horizontal scale
+    u.write("HOR:MAIN:SCALE?")
+    hscale = float(u.read(1).split()[1])
+    print "Horizontal scale is %f sec/div" % (hscale)
+
+    # Make sure the previous commands have been executed
+    u.write("*WAI")
+
+    # Fetch curve data (wait up to 1 second)
+    u.write("CURVE?")
+    then = time.time()                            
+    result = u.read(1.0)
+    now = time.time()
+    print "CURVE read took %f milliseconds" % ((now - then) * 1000.0)
+
+    # Parse data
+    ary = scpi.bindecode(result, header = ':CURVE ', dtype = numpy.dtype('>h'))
+
+    # Convert to volts
+    ary = ary / 32768.0 * vscale
+
+    # Plot data
+    pylab.plot(ary)
+    pylab.show()
+    
+if __name__ == "__main__":
+    u = usb488.USB488Device()
+    print "Found device"
+
+    test(u)