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{
"metadata": {
"name": ""
},
"nbformat": 3,
"nbformat_minor": 0,
"worksheets": [
{
"cells": [
{
"cell_type": "heading",
"level": 1,
"metadata": {},
"source": [
"Chapter 13: Shielding And Grounding"
]
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example13_1,pg 405"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"# find diagnostic ratio\n",
"\n",
"import math\n",
"#Variable declaration\n",
"t1=0.1*10**-6 #time span for voltage\n",
"t2=1*10**-6 #time span for current\n",
"\n",
"#voltage switching\n",
"V1=0.5 #level-1\n",
"V2=5.0 #level-2\n",
"\n",
"#current switching\n",
"I1=0 #level-1\n",
"I2=10*10**-3 #level-2\n",
"\n",
"\n",
"#Calculations\n",
"DR=(((V2-V1)/t1)/((I2-I1)/t2))\n",
"\n",
"#Result\n",
"print(\"dissipation ratio:\")\n",
"print(\"DR = %.f ohm\\n\"%DR)\n",
"print(\"DR is quite large indicating noise interference by capacitive coupling.\")"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"dissipation ratio:\n",
"DR = 4500 ohm\n",
"\n",
"DR is quite large indicating noise interference by capacitive coupling.\n"
]
}
],
"prompt_number": 1
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example13_2,pg 509"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"# find diagnostic ratio\n",
"\n",
"import math\n",
"#variable declaration\n",
"t1=1*10**-6 #time span for voltage\n",
"t2=1*10**-6 #time span for current\n",
"\n",
"#voltage switching\n",
"V1=0.5 #level-1\n",
"V2=1.0 #level-2\n",
"\n",
"#current switching\n",
"I1=1*10**-3 #level-1\n",
"I2=10*10**-3 #level-2\n",
"\n",
"#Calculations\n",
"DR=(((V2-V1)/t1)/((I2-I1)/t2))\n",
"\n",
"#Result\n",
"print(\"pseudoimpedance:\")\n",
"print(\"DR = %.f ohm\\n\"%(math.floor(DR)))\n",
"print(\"DR is not quite large indicating noise interference by inductive coupling.\")\n"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"pseudoimpedance:\n",
"DR = 55 ohm\n",
"\n",
"DR is not quite large indicating noise interference by inductive coupling.\n"
]
}
],
"prompt_number": 4
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example13_3,pg 510"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"# find ground loop current\n",
"\n",
"import math\n",
"#Variable declaration\n",
"Vi=12.0 #input DC voltage\n",
"Vo=3.182 #output voltage\n",
"Rg=130*10**3 #grounding resistance \n",
"R2=1*10**3 #output resistance\n",
"R1=6.8*10**3 #divider chain\n",
"\n",
"#Calculations\n",
"Ig=(Vo-((2*R2*Vi)/(R1+R2)))/Rg\n",
"\n",
"#Result\n",
"print(\"grounding loop current:\")\n",
"print(\"Ig = %.1f micro-A\"%(Ig*10**6))"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"grounding loop current:\n",
"Ig = 0.8 micro-A\n"
]
}
],
"prompt_number": 8
}
],
"metadata": {}
}
]
}
|
