Mercurial > ~darius > hgwebdir.cgi > pyinst
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> |
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date | Wed, 10 Aug 2011 12:51:07 +0930 |
parents | example.py@813e183cfd49 |
children | 9bb8a9f3df6b |
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--- /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)