\n",
" Requirements:
\n",
"
Example of use with an Agilent [90000 X Series](www.agilent.com/find/90000x-scope) Oscilloscope:
" ] }, { "cell_type": "code", "collapsed": false, "input": [ "from visa import instrument # Import the instrument function from the visa module\n", "scope = instrument(\"TCPIP0::130.30.240.155::inst0::INSTR\") # Connect to the scope using the VISA address (see below)\n", "scope.ask(\"*IDN?\") # Query the IDN properties of the scope" ], "language": "python", "metadata": {}, "outputs": [ { "metadata": {}, "output_type": "pyout", "prompt_number": 1, "text": [ "'Agilent Technologies,MSOX93204A,MY53240105,04.60.0016'" ] } ], "prompt_number": 1 }, { "cell_type": "markdown", "metadata": {}, "source": [ "The instrument's visa address can be found in the IO Libraries Connection Expert:![](\"files/IOLibs_visa_address.jpg\")
"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"Now let's do something more interesting..."
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"import numpy as np\n",
"import matplotlib.pyplot as plt\n",
"# Allow plots to appear inline with the IPython notebook\n",
"%pylab inline\n",
"scope.write(\":TIM:SCALE 600e-12\")\n",
"scope.write(\":DIG\") # Capture a single waveform\n",
"wfm_ascii = scope.ask(\":WAV:DATA?\") # Get the waveform data\n",
"wfm_ascii = wfm_ascii[:-1] # Remove a trailing ,\n",
"wfm = [float(s) for s in wfm_ascii.split(',')] # Convert the ascii list of strings to a list of floats\n",
"sa_rate = float(scope.ask(\":ACQ:SRAT:ANAL?\")) # Get the scope's sample rate\n",
"mem_depth = float(scope.ask(\":ACQ:POIN?\")) # Get the current memory depth\n",
"t = np.linspace(-mem_depth/sa_rate,mem_depth/sa_rate, len(wfm)) # Calculate the sample times of the waveform\n",
"plt.plot(t,wfm) # Plot the waveform vs sample times"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Populating the interactive namespace from numpy and matplotlib\n"
]
},
{
"metadata": {},
"output_type": "pyout",
"prompt_number": 12,
"text": [
"[| \n", " | Test ID | \n", "Test Name | \n", "Measured Item | \n", "Trial 1 Value | \n", "
|---|---|---|---|---|
| 0 | \n", "2301 | \n", "Add-in Card Tx, Un... | \n", "Data Lane | \n", "Lane0 | \n", "
| 1 | \n", "2301 | \n", "Add-in Card Tx, Un... | \n", "Note: | \n", "Non-SSC Limits Use... | \n", "
| 2 | \n", "2301 | \n", "Add-in Card Tx, Un... | \n", "Actual Value | \n", "401.7540 | \n", "
| 3 | \n", "2301 | \n", "Add-in Card Tx, Un... | \n", "#3500 UI Blocks Me... | \n", "992144 | \n", "
| 4 | \n", "2301 | \n", "Add-in Card Tx, Un... | \n", "Margin | \n", "-680.8 | \n", "
| 5 | \n", "2301 | \n", "Add-in Card Tx, Un... | \n", "Min UI | \n", "401.7430 | \n", "
| 6 | \n", "2301 | \n", "Add-in Card Tx, Un... | \n", "Max UI | \n", "401.7540 | \n", "
| 7 | \n", "2301 | \n", "Add-in Card Tx, Un... | \n", "Mean UI | \n", "401.7480 | \n", "
| 8 | \n", "2301 | \n", "Add-in Card Tx, Un... | \n", "Worst Case Data Rate | \n", "2489085360.693 | \n", "
| 9 | \n", "2301 | \n", "Add-in Card Tx, Un... | \n", "Mean Data Rate | \n", "2489122534.524 | \n", "
| 10 | \n", "2301 | \n", "Add-in Card Tx, Un... | \n", "Connection Type | \n", "Chan 1,3 - Direct ... | \n", "