How to detect threshold voltage from xy graph?

I am making labview program for analysing VI characteristic of diode. I want to show forwardbiased breakdown voltage automatically in xy graph or textbox. Is there any method for detecting breakdown voltage either through graph or some mathematical coding???

Something like this?
There are only two ways to tell somebody thanks: Kudos and Marked Solutions
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Attachments:
Threshold.png ‏12 KB

Similar Messages

Peak detection (threshold detector) from spreadsheets.

Hello!
I am working on VI that reads two signals, detects peaks that are above a specific treshold and then estimates time difference between these peaks in samples and in seconds.
Recently I have obtained two waveforms using an oscilloscope in a laboratory. Then I saved these two graphs in a spreadsheet in Excel format (first number is time, second is amplitude). Time difference between them is really small, just a few nanoseconds according to the oscilloscope. I think treshold should be 0.3.
My question is how to make Threshold Detector.vi read values from two excel files? Or maybe I need to use another instrument for this purpose. I am quite confused.
I attached all materials I have.
Any help is highly appreciated!
Thank you.
Attachments:
Inception 2.vi ‏55 KB
position S1-S2a.jpg ‏3004 KB

I tried Read From Spreadsheet File.vi, but have not got any positive result. Probably it reads my spreadsheets, but peak detection does not work properly. When I set up any threshold in Threshold Detector.vi that is more than zero (for example, 0.01), final results turn to zero. The same occurs when indexes in Index Array are not zeroes.
I attached my vi saved for LV2009. Please, have a look.
Thanks.
Attachments:
Inception 2.vi ‏49 KB
Peak detection.jpg ‏108 KB

ANSWER: HOW TO DETECT Java Plugin from JavaScript

I created a new topic because the questions about
how to detect Java Plugin in browsers are scattered
thoughout this forum.
Basically you need to employ two approaches for IE and NS.
In IE you need to try to instantiate a small applet
(not your production applet) in order to see if browser
can do it. if the browser can do it, you can make a
call applet from JavaScript in order to find version of
JRE (as well as a host of other things).
In NS you can write a simple JavaScript which will
interrogate the browser for all plugins installed. Then
ypu can make a desicion whether to pass execution to
the next(or generated) page which hosts your applet,
or ask the user to download/install a plugin.
I ecourage everybody to host a plugin on your site
rather leave default link to it which is generated by
html converter.
In order to run sample,
Prerequisites:
Java Plugin 1.3.
If you have a different version of plugin,
substitute hardcoded plugin version in JavaScript for
value that you have.
1. compile java file
2. put class file in the same directory with html file
3. load html file into the browser.
4. press "Check Java Plugin.." button
5. see it work
6. examine code
7. uninstall plugin
8. repeat steps 1 - 4
9. see it work
10. install plugin.
Sample code follows:
**********************HTML FILE BEGIN***********
<HTML>
<HEAD>

<TITLE>Detect Java Runtime</TITLE>
</HEAD>
<SCRIPT LANGUAGE="JavaScript">
var browsername;
function doNetscape()
for (i=0; i < navigator.plugins.length; i++)
for (j = 0; j < navigator.plugins.length; j++)
if(navigator.plugins[i][j].type == "application/x-java-applet;version=1.3")
alert("You are running Netscape with Java Plugin 1.3.0 - OK");
return;
alert("You are running Netscape\nPlease, install Java Runtime Environment 1.3.0");
function doMicrosoft()
var applet = document.myApplet;
if(applet == null)
alert("You are running Microsoft Browser.\nPlease, install Java Runtime Environment 1.3.0");
return;
var version = applet.getJavaVersion();
if(version == "1.3.0")
alert("You are running IE, Java Plugin 1.3.0 installed - OK");
else
alert("You are running IE, other plugin installed - mybe OK if later that 1.3.0\nYour version: " + version);
function getJava()
var applet = document.myApplet;
if(applet == null)
alert("Please, install Java Runtime Environment");
return;
     alert("JRE Version: " + document.myApplet.getJavaVersion());
function checkJavaPlugin()
     browsername = navigator.appName;
     if(browsername.indexOf("Netscape")!= -1)
          browsername="NS";
          doNetscape();
     else
          if(browsername.indexOf("Microsoft")!=-1)
               browsername="MSIE";
               doMicrosoft();
          else
               browsername="N/A";
               alert("Unknown browser: " + browsername);
</SCRIPT>
<body>
<Strong>Check Java Plugin</strong>
<OBJECT id="myApplet" classid="clsid:8AD9C840-044E-11D1-B3E9-00805F499D93"
     WIDTH = 1
     HEIGHT = 1 >
     <PARAM NAME = CODE VALUE = "DetectPluginApplet.class" >
     <PARAM NAME="scriptable" VALUE="true" >
     <embed type="application/x-java-applet;version=1.3"
          code = DetectPluginApplet width = 2 height = 2 MAYSCRIPT = "true" >
     </embed>
     </EMBED>
</object>
<FORM>
     <INPUT TYPE="button" value="Get Plugin Version in IE" onClick="getJava()">
     <INPUT TYPE="button" value="Check Java Plugin in NS and IE" onClick="javascript:checkJavaPlugin()">
</FORM>
</BODY>
</HTML>
**********************HTML FILE END***********
***************APPLET FILE BEGIN***********
import java.awt.*;
public class DetectPluginApplet extends java.applet.Applet
     public void init()
          add(new Label("DetectPluginApplet"));
public String getJavaVersion()
return System.getProperty("java.version");
**************APPLLET FILE END************

Try following java script, it works on new browsers (NS 4+, IE5+). For IE you have to enable 'ActiveX objects creation' in security options.
var agt=navigator.userAgent.toLowerCase();
var is_major = parseInt(navigator.appVersion);
var is_nav = ((agt.indexOf('mozilla')!=-1) && (agt.indexOf('spoofer')==-1)
&& (agt.indexOf('compatible') == -1) && (agt.indexOf('opera')==-1)
&& (agt.indexOf('webtv')==-1) && (agt.indexOf('hotjava')==-1));
var is_nav4up = (is_nav && (is_major >= 4));
var is_ie = ((agt.indexOf("msie") != -1) && (agt.indexOf("opera") == -1));
var is_ie5 = (is_ie && (is_major == 4) && (agt.indexOf("msie 5.0")!=-1) );
var is_ie5_5 = (is_ie && (is_major == 4) && (agt.indexOf("msie 5.5") !=-1));
var is_ie6 = (is_ie && (is_major == 4) && (agt.indexOf("msie 6.0") !=-1));
var is_ie5up = (is_ie && (is_major == 4)
&& ( (agt.indexOf("msie 5.0")!=-1)
|| (agt.indexOf("msie 5.5")!=-1)
|| (agt.indexOf("msie 6.0")!=-1) ) );
var pluginDetected = false;
var activeXDisabled = false;
// we can check for plugin existence only when browser is 'is_ie5up' or 'is_nav4up'
if(is_nav4up) {
// Refresh 'navigator.plugins' to get newly installed plugins.
// Use 'navigator.plugins.refresh(false)' to refresh plugins
// without refreshing open documents (browser windows)
if(navigator.plugins) {
navigator.plugins.refresh(false);
// check for Java plugin in installed plugins
if(navigator.mimeTypes) {
for (i=0; i < navigator.mimeTypes.length; i++) {
if( (navigator.mimeTypes[ i].type != null)
&& (navigator.mimeTypes[ i].type.indexOf(
"application/x-java-applet;jpi-version=1.3") != -1) ) {
pluginDetected = true;
break;
} else if (is_ie5up) {
var javaVersion;
var shell;
try {
// Create WSH(WindowsScriptHost) shell, available on Windows only
shell = new ActiveXObject("WScript.Shell");
if (shell != null) {
// Read JRE version from Window Registry
try {
javaVersion = shell.regRead("HKEY_LOCAL_MACHINE\\Software\\JavaSoft\\Java Runtime Environment\\CurrentVersion");
} catch(e) {
// handle exceptions raised by 'shell.regRead(...)' here
// so that the outer try-catch block would receive only
// exceptions raised by 'shell = new ActiveXObject(...)'
} catch(e) {
// Creating ActiveX controls thru script is disabled
// in InternetExplorer security options
// To enable it:
// a. Go to the 'Tools --> Internet Options' menu
// b. Select the 'Security' tab
// c. Select zone (Internet/Intranet)
// d. Click the 'Custom Level..' button which will display the
// 'Security Settings' window.
// e. Enable the option 'Initialize and script ActiveX controls
// not marked as safe'
activeXDisabled = true;
// Check whether we got required (1.3+) Java Plugin
if ( (javaVersion != null) && (javaVersion.indexOf("1.3") != -1) ) {
pluginDetected = true;
if (pluginDetected) {
// show applet page
} else if (confirm("Java Plugin 1.3+ not found, Do you want to download it?")) {
// show install page
} else {
// show error page
}

How to read multiple voltages from DAQ at same time?

Hello all,
I am attempting to read multiple voltage inputs to my USB-6008 DAQ but when I try to read a second voltage, I get an error saying "Erorr 50103 the resource is reserved." Someone in another thread said:
"The reserved resource is your DAQ board. You should not be using two separate simultaneous tasks for the same DAQ board. You should use a single task with two channels configured."
So I made multiple channels in one task, but I don't want to read all the channels at once. Is there a way to specify which channel of the task to read? Or is it not possible to acquire multiple voltages from the DAQ at all?
So the question boils down to: if you have 3 different voltage inputs into your DAQ, all corresponding to different components, is there a way to be tracking and reading all of them at the same time?
Thanks a lot

shahidi124 wrote:
Hello all,
I am attempting to read multiple voltage inputs to my USB-6008 DAQ but when I try to read a second voltage, I get an error saying "Erorr 50103 the resource is reserved." Someone in another thread said:
"The reserved resource is your DAQ board. You should not be using two separate simultaneous tasks for the same DAQ board. You should use a single task with two channels configured."
So I made multiple channels in one task, but I don't want to read all the channels at once. Is there a way to specify which channel of the task to read? Or is it not possible to acquire multiple voltages from the DAQ at all?
So the question boils down to: if you have 3 different voltage inputs into your DAQ, all corresponding to different components, is there a way to be tracking and reading all of them at the same time?
Thanks a lot
I don't understand your question. You made a task to read all the channels at once, but you do not want to read all the channels at once? And you want to track and read all the channels at the same time?
You need to explain it a little bit better and add some code of what you have done so far. A task will read all the channels in the task and give you the results so you can track them. So I am confused.

How to detect concurrent updates from MS Access database

Hi...
I would like to know how can LV detect the MS Access database if there is any updates data from others application such as VB6 through the same database.. I do not want the LV to check from the database so oftenly. It will only do the checking / refreshing of data when there is a new data updated by other software (like VB) into the same database. THANKS!!......

222,
It sounds like you want MS Access to send an event or callback to your Labview program whenever it receives an update. I'm definitely no Access expert, and I'm not sure if the program can generate events like that (I've done some searches at Microsoft.com, with no luck so far). I would suggest going to Microsoft's website to either contact technical support with the question, or post to their forums. The first step would be figuring out if it's possible to generate such an event, and if so, we can go from there. If not, the polling method might be the only option. Here are some links that will help get you started:
Microsoft Access Home
Microsoft Office Access 2003 Help and Support
-Justin

How to detect an error from ajax get

Hi -- This is in a javascript function.
I have an object ajaxRequest defined as:
ajaxRequest = new htmldb_Get(null,&APP_ID.,'APPLICATION_PROCESS=LOOKUP_VALUE',0);
I call the app process as follows:
ajaxResponse = ajaxRequest.get();
The app process just looks up a value in the DB based on another. It works fine
when there's a match. When there's not a match, I can see that the ajaxResponse
contains "sqlerrm: ORA- ... ". And of course a json.parse fails.
How can I detect that the get returned an error? I can't just search
ajaxResponse for an string, right? (It doesn't appear that that object is
simply treated as a string... )
Thanks,
Carol

hi John -- Sounds good, but I guess I'm not sure how to go about it.
LOOKUP_VALUE is:
DECLARE
-- Set wwv_flow.g_x01, g_x02, g_x03, g_x04 and g_x05 in the
-- javascript part
p_source_item_value varchar2(1000) := wwv_flow.g_x01;
d_source_column_name varchar2(32) := wwv_flow.g_x02;
d_dest_column_name varchar2(32) := wwv_flow.g_x04;
d_lookup_table_name varchar2(32) := wwv_flow.g_x05;
BEGIN
--Use this to get a JSON string back in the javascript,
-- based on the SQL query
APEX_UTIL.JSON_FROM_SQL('SELECT '||d_dest_column_name||' RETURN_VAL FROM '||d_lookup_table_name||'@'||:DB_NAME||' WHERE '||d_source_column_name||' = '''|| p_source_item_value||'''');
END;
So, it's returning this JSON object to the javascript. As I said, it works fine when there's a match.
I'm not sure how to catch an error in the LOOKUP_VALUE process and get it back to the javascript. Ideas?
Also, even if I do get that going, I'm not sure how to check the returned object for some sort of problem.
The javascript function code is below. Look for #### for my comments. Essentially, right now, if
there is an error in the json object (it's showing up as a numeric or value error), the parse fails. So I
need to detect the problem before the parse. OR, if I can just modify LOOKUP_VALUE to plug in
something like 'NO MATCH' when there's a problem or no value is found, then I think json.parse will work
and my page item can just be set to NO MATCH. Does this make sense?
Here's the function.
Thanks for your help!
Carol
function jsLookupValue(source_item_value, source_column_name, dest_item_name, dest_column_name, lookup_table_name){
// Continue only if there are valid values
if (valueOf(source_column_name)&&valueOf(dest_item_name)&&valueOf(dest_column_name)&&valueOf(lookup_table_name)){
//Check to see if the source_item_value is null (either all spaces or empty
//If it is, set the dest item to null, but only if it's not already --
//otherwise we get into a loop.
source_item_value = trim(source_item_value);
dest_item_value = trim($v(dest_item_name));
if (source_item_value.length==0) {
if (dest_item_value.length != 0) {
$s(dest_item_name, null);
}else{
//This is the AJAX call to the Application Process from step 1
ajaxRequest = new htmldb_Get(null,&APP_ID.,'APPLICATION_PROCESS=LOOKUP_VALUE',0);
//Here we are adding that x01 parameter we use in the app process with the value of the objecttype_name field
ajaxRequest.addParam('x01', source_item_value);
ajaxRequest.addParam('x02', source_column_name);
ajaxRequest.addParam('x03', dest_item_name);
ajaxRequest.addParam('x04', dest_column_name);
ajaxRequest.addParam('x05', lookup_table_name);
//Now do the actual AJAX call and put the result in ajaxResponse
ajaxResponse = ajaxRequest.get();
//Check if there is a response
if (ajaxResponse) {
// ######### When there's no row matching the query, this alert shows
// "sqlerrm: ORA-06502 PL/SQL: numeric or value error"
// Can I somehow check ajaxResponse for that string?
alert("Response from APP process: " + ajaxResponse);
//We need to format the JSON return string and put it in a JSON object
// the formatting is done by a function in the external JSON library
// the jsonobj can be used to retrieve the data returned by the App process
// ######### If there was an error, the parse fails
var jsonobj= ajaxResponse.parseJSON();
alert('Filtered returned value from APP process: ' + jsonobj.row[0].RETURN_VAL);
// And finally, we set the DNAME item with the value of the jsonobj.DNAME
// an array was created in the object with the name row, so that is why you have to include row[0] to retrieve the data
if (jsonobj.row[0].RETURN_VAL != $v(dest_item_name)) {
// ########## I'd like to just set the destination item w/ something like "NO MATCH"
// probably regardless of the error...
$s(dest_item_name, jsonobj.row[0].RETURN_VAL);
}else{
//alert ('NOT setting dest item');
} //not setting
}else{
alert('No response from app process');
} //no response
} //no source item value
} //no bad nulls
} //function

How to Detect System Availability from WD Application Integrator iView

Hey All -
I've created an WD ABAP iView using the wizard (SAP Web Dynpro iView template) to connect to SAP's SNC bolt-on module (Supplier Network Collaboration). The application is written in ABAP WD and I can connect to it rendering the application just fine by supplying the correct namespace and application name.
When I simulate SNC not being available for some reason (down), I do not get any kind of message - Just a blank iView. My user community would like a custom error message telling them that the "system is unavailable."
How do I accomplish this ?? In a nutshell - when I cannot access the application, how can I control what the user see's in the iView ? Do I need to create a custom template or what would be the best way to handle this. I assume this is a common question, but was unable to locate it.
Many thanks in Advance !!

Hi Christopher,
the WD ABAP iView will only display whatever the underlying system returns. Are you able to send back a message from the SNC system when it's unavailable? If not you would have to create a custom iView that can detect if the system is down and report it to the user. The iView could first check if the system us up and running and if so redirect the user to the application. If not it would display a message. Alternatively, you could have both in a page where the first one raises an event depending on the SNC system status. The WD app would subscribe to that event and react accordingly.
Hope this is of help.
Cheers,
Dion

How to obtain plot list from xy graph

Hi!
I have a XY Graph and I wnat to get the number of Plots in that Graph. There is no Property for this.
Anyone knows how to do this?
Bya
hmann

hi
i don't know, but try it with the "array size" function... a xy-graph is a 1d-array of clusters. in these clusters there are two 1d-array which represent x and y coords. the "array size" function should return the number of plots (clusters) of the xy-graph.... try it and let me know if it works..
ciao

How to detect client OS from SQL*Plus script

Sometimes in a SQL*Plus script I need to execute OS commands e.g.
host rm tempfile.bufHowever of course Windows has no "rm" command by default, so I have to edit the script to use
host del tempfile.bufNow if I could define &DELETE (for example, "cat"/"type" is another) as a substitution variable, I could just use
host &DELETE tempfile.bufMaybe I need more coffee but all I could come up with was something like this:
def rm=rm
def cat=cat
spool sqlplus_windows_defs.cmd
prompt echo def rm=del
prompt echo def cat=type
spool off
host .\sqlplus_windows_defs > sqlplus_windows_defs.sql
@sqlplus_windows_defs.sql
host &rm sqlplus_windows_defs.cmd
host &rm sqlplus_windows_defs.sqlthe idea being that you first define the variables for nix ("rm" and "cat"), then attempt to create and execute a Windows command file containing DOS versions ("dele" and "type"), which does not run under nix. Unfortunately the OS failure message (".sqlplus_windows_defs: not found" in Unix) appears on the screen despite SET TERM OFF, so I'm back where I started.
I know there are various ways to get the server OS, and you can get the SQL*Plus version with &_SQLPLUS_RELEASE and so on, but I can't see a way to determine the client OS. Any suggestions?

Thanks guys. This seems to work in Windows XP - will try on Unix when I get a chance:
col DELETE_COMMAND new_value DELETE_COMMAND
col LIST_COMMAND new_value LIST_COMMAND
def list_command = TYPE
def delete_command = DEL
SELECT DECODE(os,'MSWIN','TYPE','cat') AS list_command
     , DECODE(os,'MSWIN','DEL','rm')   AS delete_command
FROM   ( SELECT CASE WHEN UPPER(program) LIKE '%.EXE' THEN 'MSWIN' END AS os
         FROM   v$session
         WHERE audsid = SYS_CONTEXT('userenv','sessionid') );
host &LIST_COMMAND xplan_errors.lst
host &DELETE_COMMAND xplan_errors.lstIf the user doesn't have access to v$session it will just default to the Windows commands.
http://www.williamrobertson.net/code/xplan.sql

How to detect id3 tag from all type of songs

Hi Friends,
I am new to mac development and i have to develop one music processing related project.
First i have to detect id3 tag of all type of songs like mp3, aac, wav.
So is there any framework or class library is available for detecting id3 tag?.
Best Regards.

hey,
Nobody knows about it?

How to detect JBO Exception from within Apps Module Custom Method ?

Hi all,
I have a custom method in apps module (AM) to set "Status" attribute to "A' in an antity, this is for approval.
Also there is a rule that the transaction cannot be approved if it is already cancelled by another user (in multi user environment).
The problem is :
If the AM custom method fail (because it throws JBOException in the entity setter method), How can I know that it fails ?
and report it back to the backing beans that call the custom method ?
Thank you for your help,
xtanto
Below is the code :
1. create a custom method in AM to do : setStatus ("A") ;
public void approve(){
ViewObject bphVo = findViewObject("BpHView1");
BpHViewRowImpl vBphViewRow = (BpHViewRowImpl)bphVo.getCurrentRow();
vBphViewRow.setStatus("A");
2. Do a validation inside setStatus method of the entity :
public void setStatus(String value) {
if (! getCancel() == true )
setAttributeInternal(STATUS, value);
else
throw new JboException("Error ! transaction already cancelled");
3. On backing beans :
public String approveButton_action() {
BindingContainer bindings = getBindings();
OperationBinding operationBinding =
bindings.getOperationBinding("approve");
Object result = operationBinding.execute();
if (!operationBinding.getErrors().isEmpty()) {
System.out.println("There is JBO Error !!");
return null;
else{
commitButton_action();
return "back";
}

Try this code:
approveButtonAction() {
String navigationString = null;
try {
Object result = operationBinding.execute();
naviagionString = success;
catch (JboException e) {
navigationString = null;
(DCBindingContainer)bc.cacheException(e);
} finally {
if(navigationString != null)
return commitButtonAction();
else
return navigationString;
}

Measuring voltage from thermocouples

How do i measure voltage from a thermocouple which is joined to another one. Meaning that they have a common point. I have tried reading in a voltage from 1 point and then subtracting it with the other but it does not give me the reading the multimeter is showing

Hello,
For troubleshooting bad readings, probably the first thing to do would be to check the board's configuration.
Is it configured in differential mode? Differential mode is the most recommended mode for thermocouple readings. When using differential mode, just make sure to connect the positive lead of the thermocouple to ACH0 (for example), and the negative to ACH8.
Once you have all the signals connected to your DAQ board, try running a MAX Test Panel. I usually run it using Continuous Mode. Before starting the acquisition, check the input limits in MAX, adjust them according to the input signal so that the board applies the appropriate gain.
Finally, create a Virtual Channel (by taking into consideration the thermocouple type). Are you re
ading the correct temperature? Is the CJC in your terminal block enabled? It's always easier to compare the temperature than the millivolts readings.
I hope these tips help. Good luck with your application!

How to calculate rms voltage, rms current and frequency from real time data?

Hello,
I need to calculate the real time rms voltage, rms current and frequency of the received voltage and current graphs using visa read. Actually am trying to monitor the voltage and current parameters of AC load, in this case, am using a set of 4 light bulbs at the moment. Expected frequency is 50 Hz, and rms voltage close to 240v AC, current about 1A.
Attached is the vi picture of what I have been able to achieve so far, courtesy of labview forums. But I need to finally finish this vi by calculating the Vrms, Irms and frequecy. The front panel shows the voltage (Chart V) and current (Chart I) after scaling. Chart VI represents ADC value 0 ~ 1023 of received data. Aray V & I show the binary bits received up to 10 bits of useful data from ADC. Each sine wave from ADC is sampled at 25 samples for the ADC conversion, and sampling frequency of 1.28kH.
I have tried using the RMS vi, but seems I don't know how to configure it correctly to get desired results. Also when I make changes like switching of one of the bulbs so that their is current change, I need to refresh the SERIAL port first before changes show up on the VI. Any ideas on how to improve on this are highly appreciated.
Otherwise, I would appreciate if somebody helps me MODIFY my VI to read the rms values and frequency from received data. This is the last piece of my project, I do appreciate all the help rendered. Am currently using labview labview 2014, student version!
Gavin.
Attachments:
Test_revised1.vi ‏39 KB
Test_frontpanel.png ‏196 KB
Test_blockdiagram.png ‏187 KB

hello,
note that peak voltage (Vpeak) is (240 * 1.414) = 399 V and peak current about 1.414 if intended rms current is 1A.
Gavin.

How Can I configure the 6024E board for reading the voltage from a source?

Hi, I have a little problem, I want to use the 6024E board for reading voltage from a source and then display this on the monitor, and also I want to change the voltage from the output using the computer. I read the manual but I don't understand how to connect and configure the board. It is to proof that the board receive and send information.
Thanks, sorry for my english, I'm from Mexico, if you don't understand something about my explanation tell me.

Thank you, now I'm trying to do my project and I have another question, there are differents ways to connect the source and I choose the NRSE configuration because I'm going to use a grounded signal source... well in the manual says "The signal is then connected to the positive input of the PGIA, and the signal local ground reference is conenected to the negative input ot the PGIA. The ground point of the signal should, therefore, be connected to the AISENSE pin." I don't understand this because I only have two wires and here is talking about three connections, please help me, how do I connect the source to the board? I have the positive wire and the negative wire.... maybe is because I don't have a perfect english and I don't understand the sentence...

How to detect whether browser's java script disabled or not from server

How to detect whether browser's java script disabled or not from server side

I would use a hidden parameter created by a javascript. if this is null, javascript is disabled...

How to detect threshold voltage from xy graph?

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