Encyclopedia Magnetica™

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===== Calculator of frequency and time =====

<box 100% #efffef>
|< 100% 10% 90% >|
|  {{/calculator/icon_calc.png?60&nolink}}  | //[[user/Stan Zurek]], Calculator of frequency and time, Encyclopedia Magnetica//, \\ @PAGEL@, {accessed: @YEAR@-@MONTH@-@DAY@} |
</box>


|  $f = 1 / t$ (Hz)  |  <HTML>
<!-- ==================== calculator starts here ============== -->
<HEAD>
<SCRIPT Language="JavaScript">

<!--
/**
 * Function that introduces calculator of a given function.
 **/
 
function getSelectedValue(selectList){
   return selectList[selectList.selectedIndex].value
}

function calculate_function(frm){
// set up variables
var freq          = frm.freq.value
var freq_unit     = getSelectedValue(frm.freq_unit)
var result1      = "1"
var result1_unit = getSelectedValue(frm.result1_unit)

// read values and convert to numbers
freq = parseFloat(freq)
freq_unit = parseFloat(freq_unit)
result1_unit = parseFloat(result1_unit)

// calculate the main function
result1 = 1 / freq / freq_unit / result1_unit

// format number to x digits precision, otherwise result will equal 5.611e+2
result1 = result1.toPrecision(4)

// display result
frm.result1.value = result1

}

//-->
</SCRIPT>
</HEAD>
<body>

<form method="post" action="">
 
frequency <i>f</i> = <input type="text" value="50" name="freq" size="6" maxlength="10" onChange="calculate_function(this.form)"> 

           <SELECT name="freq_unit" onChange="calculate_function(this.form)">
           <OPTION value="1e-3">(mHz)</OPTION>
           <OPTION value="1" selected>(Hz)</OPTION>
           <OPTION value="1e3">(kHz)</OPTION>
           <OPTION value="1e6">(MHz)</OPTION>
           <OPTION value="1e9">(GHz)</OPTION>
        </SELECT><br>

        <input type="button" name="Button" value="== Calculate ==" onClick="calculate_function(this.form)"><br>


period <i>t</i>= <input type="text" name="result1" size="6" maxlength="10"> 
            <SELECT name="result1_unit" onChange="calculate_function(this.form)">
           <OPTION value="1e-9">(ns)</OPTION>
           <OPTION value="1e-6">(us)</OPTION>
           <OPTION value="1e-3" selected>(ms)</OPTION>
           <OPTION value="1">(s)</OPTION>
        </SELECT>
        
 </form>
 
</BODY>
<!-- ==================== calculator ends here ============== -->
</HTML>  |

|  $t = 1 / f$ (s)  |  <HTML>
<!-- ==================== calculator starts here ============== -->
<HEAD>
<SCRIPT Language="JavaScript">

<!--
/**
 * Function that introduces calculator of a given function.
 **/
 
function getSelectedValue2(selectList){
   return selectList[selectList.selectedIndex].value
}

function calculate_function2(frm){
// set up variables
var time       = frm.time.value
var time_unit     = getSelectedValue2(frm.time_unit)
var result2      = "1"
var result2_unit = getSelectedValue2(frm.result2_unit)


// read values and convert to numbers
time = parseFloat(time)
time_unit = parseFloat(time_unit)
result2_unit = parseFloat(result2_unit)

// calculate the main function
result2 = 1 / time / time_unit / result2_unit

// format number to x digits precision, otherwise result will equal 5.611e+2
result2 = result2.toPrecision(4)

// display result
frm.result2.value = result2

}

//-->
</SCRIPT>
</HEAD>
<body>

<form method="post" action="">
          
       period <i>t</i> = <input type="text" value="20" name="time" size="6" maxlength="10" onChange="calculate_function(this.form)"> 
 
          <SELECT name="time_unit" onChange="calculate_function2(this.form)">
           <OPTION value="1e-9">(ns)</OPTION>
           <OPTION value="1e-6">(us)</OPTION>
           <OPTION value="1e-3" selected>(ms)</OPTION>
           <OPTION value="1">(s)</OPTION>
        </SELECT><br>
                
        <input type="button" name="Button2" value="== Calculate ==" onClick="calculate_function2(this.form)"><br>


frequency <i>f</i>= <input type="text" name="result2" size="6" maxlength="10"> 
 
           <SELECT name="result2_unit" onChange="calculate_function2(this.form)">
           <OPTION value="1e-3">(mHz)</OPTION>
           <OPTION value="1" selected>(Hz)</OPTION>
           <OPTION value="1e3">(kHz)</OPTION>
           <OPTION value="1e6">(MHz)</OPTION>
           <OPTION value="1e9">(GHz)</OPTION>
        </SELECT><br>
             
 </form>
 
</BODY>
<!-- ==================== calculator ends here ============== -->
</HTML>  |
 

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{{tag>Calculators Frequency Time Period Cycle}}