#!/usr/bin/env python
import numpy
import matplotlib.pyplot as plot
from pyusbtmc import RigolScope
""" Example program to plot the Y-T data from Channel 1"""
# Initialize our scope
test = RigolScope("/dev/usbtmc0")
# Stop data acquisition
test.write(":STOP")
# Grab the data from channel 1
test.write(":WAV:POIN:MODE NOR")
test.write(":WAV:DATA? CHAN1")
rawdata = test.read(9000)
data = numpy.frombuffer(rawdata, dtype='B', offset=10)
# Get the voltage scale
test.write(":CHAN1:SCAL?")
voltscale = float(test.read(20))
# And the voltage offset
test.write(":CHAN1:OFFS?")
voltoffset = float(test.read(20))
# Walk through the data, and map it to actual voltages
# First invert the data (ya rly)
# tUnit = "uS"
# elif (time[599] < 1):
# time = time * 1e3
# tUnit = "mS"
# else:
# tUnit = "S"
return [time, data]
# Initialize our scope
test = RigolScope("/dev/usbtmc0")
plot.ion()
while 1:
t1, d1 = getChannelData(1)
t2, d2 = getChannelData(2)
# Start data acquisition again, and put the scope back in local mode
test.write(":KEY:FORC")
# Plot the data
plot.clf()
plot.plot(t1, d1)
plot.plot(t2, d2)
plot.title("Oscilloscope data")
plot.ylabel("Voltage (V)")
plot.xlabel("Time (s)")
plot.xlim(t1[0], t1[599])
plot.draw()
