Get waveform from TDS2012

Hello,
the attachment is an example whose function is to acquire the waveform from an oscilloscope from a reference book. Now I'm wondering whether the waveform displayed in the waveform graph is just the waveform the oscilloscope acquires. My oscilloscope is TDS2012. I connect the oscilloscoe probe to the channel 1 input connctor.Attach the probe tip and ground lead to the PROBE COMP connectors.The PROBE COMP signal is a square wave with a frequency of 1KHz and a peak voltage of 5V. If I choose channel 1 as the trig source, and let the programme run for 1000 times,it will take more than 1minute to complete this task. I just want to know whether the waveforms refreshed in the waveform graph are generated by the source during the 1 second since the programme starts.
Attachments:
get waveform from an oscilloscope with VISA function.vi ‏17 KB

Hi yaoyao,
Your question all depends on the behavior of the CURVE? command. If it generates a new acquisition each time it is called, then you should be seeing 1000 different waveforms. If CURVE? simply transfers the existing waveform without initiating a new one, you will be transferring the same waveform 1000 times. The programming manual should have more details about the behavior. You may need to call
You should look at the LabVIEW instrument driver that we have for this instrument:
http://sine.ni.com/apps/utf8/niid_web_display.download_page?p_id_guid=047216EC20B66FABE0440003BA7CCD...
The instrument driver should simplify programming and you can look at the block diagrams to see which instrument commands are being sent.

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Error getting waveform from LT264 by GPIB

Hello,
I installed the lclvxxxx driver for LeCroy scope LT264. I tried the example which came with the instrument driver. When I run it I get an error saying
Error -1074126845 occurred at lcltxxxx Read Waveform.vi
Possible reason(s):
Driver Status: (Hex 0xBFFA2003) Maximum time exceeded.
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It seems that the example works fine until the moment that the waveform will actually be read.
Anyone familiar with this problem?
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Hi Srinivasa,
What is the error you are getting?Did you try setting in all the values required for the Input paramater fields and structures?
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How is dt from "Get Waveform Components" calculated?

I am acquiring data, making waveforms, and writing to TDMS.
I physically took data for 2 hours and did timed events.
When I "Get Waveform Components" and determine array size of components I get the following result for data length:
dt = 0.002 sec/sample (500 hz)
Array Size of waveform components = 129350 samples
0.002 x 129350 = 258.7 sec = 4.3 min of total data length
When I view the waveform in Labview, I see an accurate representation of my timed events.
It looks like the full 2 hours of data is captured to some degree.
If I am losing data, does that mean my dt isn't always equal to 0.002 like "Get Waveform Components" says?
Any other ideas?
Thanks!

Waveforms assume a constant dt with each sample occuring every dt. If you are missing data, then the waveform will show a shorter acquisition time and what you actually took. Since you claim your times look right, then it is safe to assume you had no data loss.
DAQmx will give you warnings if you miss data from the DAQ card's buffer (data overwritten). So if you didn't get a warning about that, then you didn't miss any data.
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Derivate a waveform from a Function generator

I want to use the derivate of a waveform from a Function generator in a Formula node, but unfortunatelly I dont no how can i do this. I need the exact value of the derivate ("qpg" input variable) to use in the equation in the Formula Node.
I found a Derivate sub VI, but it gives me the derivate as a vector so i cant wire it as an input to the Formula node.
I attached pictures about my VI.

As I understand it, you are using a Waveform Generator VI, and want (in addition to the Waveform) an additional output that is (an estimate of) the derivative of the Waveform.
If you consider the Waveform Generator as a "black box", something whose internals you don't know, but something that produces a new output every delta-t time increment (I'm going to call this "dt"), then you really do need to estimate the derivative. Note that since you cannot "predict the future", to estimate the derivative, you need the current data and previous data. One very common estimate for the derivative x'(t) at time t is (x(t) - x(t-dt))/dt, that is, the difference between the current point and the previous point, divided by the time increment. For a waveform generator, this will probably be a pretty good estimate, as the data should be relatively "smooth" and noise-free. Do note, however, that this estimate is really over the time interval t-dt and t, so you could consider it shifted backward in time by dt/2.
If you want a more accurate estimate of the derivative, one "centered" on the current time, t, then your formula needs to take into account not only the current value and past values but also future values. This is the reason many "derivative functions" use vectors, as this contains past and present values (with some worry about what to do at the beginning and end of the data).
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Bob Schor

Get waveform subset vi lagging

Hello all,
I'm running into an issue with a Get Waveform Subset.vi taking an awfully long time to run (~15s). I'm working with a large-ish data set (5431296 data points). I double checked with the Performance and Memory tool and it's defiantly something with this VI.
The program is suppose to grab a new subset from the waveform and look for a trigger, record where the event happens, then move onto the next subset and repeat.
Am I doing something wrong with the VI to make it lag so much? Or better yet, is there a better way to do what I'm trying to accomplish?
Attachments:
Problem with GetWaveformSubset.JPG ‏66 KB

Hi Lynn,
What values are you using for Start samples and Duration?
Start: 333131 initially then it increments depending on where the triggered edge is
Duration: 55 samples
Do you get any errors?
None that I could see. The Get Waveform Subset vi rounded my duration and start sample values which I was fine with.
How many iterations does it run.
The current code runs ~800 - 900 iteration.
So since it last posted, I removed the Get Waveform Subset vi and replaced it with a ArraySubset thinking it would speed things up. Turns out the Get Waveform Subset vi is fairly optimized already...go figure.I also decimated my waveform using the Resample Waveform vi to reduce the number of samples in each subset. By playing with my re sampling interval, I was able to reduce the run time to ~ 3 seconds.
So here's what I'm actually trying to do and for full disclosure, yes, it is for a school assignment.
I have a signal from a NOAA satellite that I'm trying to convert into a image. The data is sent using APT format and is not real time, rather just an audio file. I have managed to demodulate the signal and removed the carrier wave and filtered the signal appropriately. What I'm having issues with is detecting synchronization pulses in my signal. Right now, my sync pulse detection scheme involves running a FIR bandpass filter at the sync pulse frequency and then using trigger detection to find where my sync pulses start.
Am I going about this the wrong way? Is there a more efficient method I should be looking at.
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Missing Audio waveforms from Project window

I'm hoping anyone can help me. I'm trying to customize volume within a range of a song. I've dragged the audio into my project timeline, however no matter what I try I cannot get the waveform to appear. I've tried absolutely everything I can think of including reverting layout of the project window.
I've worked with audio in projects before and feel I have a fair bit of experience with it but this one has really baffled me.
As you can see from the image attached, waveforms from other audio clips are showing up just fine but the song running along the bottom, no workie.
Any help would be greatly appreciated.
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Karsten Schlüter wrote:
•you should re-name it (before importing to FCPX) - that "." could cause issues.
(avoid any characters that have a 'function' in Unix, such as . : / )
A period only has a UNIX function if it is the FIRST character in the name! (hide file from Finder view), so that is not the issue here. ;-)
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"Get Waveform Subset": version incompatibility

Hello everybody!
I was studing an already developped software and there was something relative to waveform uses that I didn't get it (concretly it was that I didn't know very well what I have to put in the Duration input when I was using the Get Waveform Subset function in the Relative Time mode. Should the duration be "T0 + sth" or just "sth"?)
Then, to understand it, I tried to simulated it. I was working at the same time with 2 computers with 2 different versions of Labview (7.1 and 8.6). The funny thing is that I created exactly the same VI for the oldest version and the new one, however it only works for the oldest one. When I try to run the new version I get that mistake message:
"Error -1801 occurred at Start value too large in Get Waveform Subset.VI.
Possible reason(s):
LabVIEW: (Hex 0xFFFFF8F7) Duration input is not an integer multiple of dt. Value was coerced to nearest integer multiple of dt."
What's wrong with my new Labview version subvi?
Thank you!!
Attachments:
8.6 version.JPG ‏18 KB
7.1 version.JPG ‏41 KB

GovBob,
Thanks a lot for your solution. Writing zero in the start input it does work. However there are 2 things I don't understand:
1-.Why does it work in the oldest version using the elapsed second function?Is the output of this function a longer number now? I think it should also work for the newest versions.
2-.If we can't write a time stamp, what do we have to do to skip the samples of a period of time? If we use like a starting time zero, what is the difference now between the relative time mode and the sample one?
I have wondered that, and I have been doing some tests and now I am more confused that before I was. :s
First of all, I was thinking: If we don't want to skip the first samples is logical that it does work for zero. I imagined that if for instance our wave starts in the second number 1000, so if we write a number below 1000, we are going to get always samples from the first positions (we could also get samples from other position but the first one would be always in the output wave).However when I wrote a signal, using as a t0 the elapsed second function and dt:1. Then I used "get waveform subset" in the relative time mode, and I set start:1 and duration:1, I got the second sample instead of the first one. (I was expecting the first one for the reason I have already explained)
Also, thinking about the behaviour of the function in the relative time mode I have done some test, in order to get a pattern, but I haven't successed. I will attached a file with the ideas got from the tests.
Attachments:
subwaveform.txt ‏3 KB

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sunshinecowgill wrote:
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Is there another way of getting apps from the appstore without putting your credit card number in, ive heard about the itunes gift card thing can anybody just give me more info about that and how i can buy free things free things from the appstorepls help

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Thank you in advance.
The following is my application
import java.util.Vector;
import java.awt.event.*;
import java.awt.*;
import java.awt.event.*;
public class UserConnection extends javax.swing.JFrame {
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private final String password = "labmanage";
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private Vector<String>colUserNames = new Vector<String>();
* Creates new form UserConnection
public UserConnection() {
initComponents();
/** This method is called from within the constructor to
* initialize the form.
* WARNING: Do NOT modify this code. The content of this method is
* always regenerated by the Form Editor.
// <editor-fold defaultstate="collapsed" desc=" Generated Code ">
private void initComponents() {
userLabel = new javax.swing.JLabel();
pwdLabel = new javax.swing.JLabel();
userTextField = new javax.swing.JTextField();
passwordField = new javax.swing.JPasswordField();
submitButton = new javax.swing.JButton();
statusLabel = new javax.swing.JLabel();
jScrollPane1 = new javax.swing.JScrollPane();
statusTextArea = new javax.swing.JTextArea();
changePwdButton = new javax.swing.JButton();
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setTitle("User's Connection");
setBackground(new java.awt.Color(153, 204, 255));
setCursor(new java.awt.Cursor(java.awt.Cursor.DEFAULT_CURSOR));
setFont(new java.awt.Font("aakar", 1, 12));
userLabel.setText("User Name:");
pwdLabel.setText("Password:");
submitButton.setText("Submit");
submitButton.addMouseListener(new java.awt.event.MouseAdapter() {
public void mouseClicked(java.awt.event.MouseEvent evt) {
submitButtonMouseClicked(evt);
submitButton.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
submitButtonActionPerformed(evt);
submitButton.addKeyListener(new java.awt.event.KeyAdapter() {
public void keyTyped(java.awt.event.KeyEvent evt) {
submitButtonKeyTyped(evt);
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statusTextArea.setEditable(false);
statusTextArea.setLineWrap(true);
statusTextArea.setRows(3);
statusTextArea.setText("Initial assigned password is \"dime\".");
statusTextArea.setWrapStyleWord(true);
jScrollPane1.setViewportView(statusTextArea);
changePwdButton.setText("Change password");
changePwdButton.addActionListener(new java.awt.event.ActionListener() {
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changePwdButtonActionPerformed(evt);
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layout.createParallelGroup(org.jdesktop.layout.GroupLayout.LEADING)
.add(layout.createSequentialGroup()
.addContainerGap()
.add(layout.createParallelGroup(org.jdesktop.layout.GroupLayout.LEADING)
.add(userLabel)
.add(pwdLabel)
.add(statusLabel))
.add(35, 35, 35)
.add(layout.createParallelGroup(org.jdesktop.layout.GroupLayout.LEADING)
.add(layout.createSequentialGroup()
.add(submitButton)
.addPreferredGap(org.jdesktop.layout.LayoutStyle.RELATED)
.add(changePwdButton))
.add(passwordField, org.jdesktop.layout.GroupLayout.DEFAULT_SIZE, 230, Short.MAX_VALUE)
.add(userTextField, org.jdesktop.layout.GroupLayout.DEFAULT_SIZE, 230, Short.MAX_VALUE)
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layout.createParallelGroup(org.jdesktop.layout.GroupLayout.LEADING)
.add(layout.createSequentialGroup()
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.addPreferredGap(org.jdesktop.layout.LayoutStyle.RELATED)
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.add(pwdLabel)
.add(passwordField, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE, org.jdesktop.layout.GroupLayout.DEFAULT_SIZE, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE))
.addPreferredGap(org.jdesktop.layout.LayoutStyle.RELATED)
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.add(statusLabel)
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.add(submitButton)
.add(changePwdButton))
.addContainerGap(27, Short.MAX_VALUE))
pack();
}// </editor-fold>
private void submitButtonKeyTyped(java.awt.event.KeyEvent evt) {
if(evt.getKeyCode() == KeyEvent.VK_ENTER) {
submitButton.doClick();
submitButton.requestFocus();
changePwdButton.requestFocus();
private void changePwdButtonActionPerformed(java.awt.event.ActionEvent evt) {
String command = evt.getActionCommand();
if(command.equals("Change password")) {
passwordField.setText("");
//Get connection to the changing password panel
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
new ChangePassword().setVisible(true);
private void submitButtonActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
String command = evt.getActionCommand();
if(command.equals("Submit")) {
user = getUser();
pwd = getPwd();
data = new JDBCAdapter(server, driver, userName, password);
data.executeQuery("SELECT * FROM USERTABLE");
colUserNames = data.getColumnNames();
userTable = data.getDataTable();
if(colUserNames.elementAt(0).equals("")) {
statusTextArea.setText("Can not connect to database");
boolean checkUser = false;
int i = 0;
while(!checkUser && i<userTable.size()) {
if(user.equalsIgnoreCase((String) userTable.elementAt(i).elementAt(0))) {
//Find the user in database
checkUser = true;
//Check user's password
if(pwd.equals((String)userTable.elementAt(i).elementAt(1))) {
//Check for initial default password. The user is requested
//to change his password
if(pwd.equals((String) "dime")) {
statusTextArea.setText("You are requested to change your " +
"initial assigned password. Click 'Change password' please.");
else {
//Set UserConnection Panel to invisible
setVisible(false);
dispose();
//Get connection to the table
if(userTable.elementAt(i).elementAt(2).equals("0")) {
//Get connection to non-editable table
javax.swing.SwingUtilities.invokeLater(new Runnable() {
public void run() {
PVRackReportNonEdit rackReport = new PVRackReportNonEdit();
rackReport.createAndShowDialog();
else {
if(userTable.elementAt(i).elementAt(2).equals("1")) {
//Get connection to editable table
javax.swing.SwingUtilities.invokeLater(new Runnable() {
public void run() {
PVRackReport rackReport = new PVRackReport(user);
rackReport.createAndShowDialog();
//PVRackReport rackReport = new PVRackReport();
else statusTextArea.setText("You do not get approval for viewing data. " +
"Please contact the administrator for details.");
else {
passwordField.setText("");
statusTextArea.setText("Please enter corrected password or" +
"the administrator for details.");
i++;
if(!checkUser) {
passwordField.setText("");
statusTextArea.setText("Not find such user's name." +
"contact the admistrator for details.");
private void submitButtonMouseClicked(java.awt.event.MouseEvent evt) {
// TODO add your handling code here:
* @param args the command line arguments
public static void main(String args[]) {
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
new UserConnection().setVisible(true);
public String getUser() {
return userTextField.getText();
public String getPwd() {
return passwordField.getText();
// Variables declaration - do not modify
private javax.swing.JButton changePwdButton;
private javax.swing.JScrollPane jScrollPane1;
private javax.swing.JPasswordField passwordField;
private javax.swing.JLabel pwdLabel;
private javax.swing.JLabel statusLabel;
private javax.swing.JTextArea statusTextArea;
private javax.swing.JButton submitButton;
private javax.swing.JLabel userLabel;
private javax.swing.JTextField userTextField;
// End of variables declaration
Here is my JDBCAdapter
package rackdemo2;
* This is an adaptor which transforms the JDBC interface
* to the PVRackTableDialogue
import java.util.Vector;
import java.sql.*;
import javax.swing.table.AbstractTableModel;
import javax.swing.event.TableModelEvent;
public class JDBCAdapter {
Connection connection;
Statement statement;
ResultSet resultSet;
Vector<String> columnNames = new Vector<String>();
Vector<Vector<String>> rows = new Vector<Vector<String>>();
ResultSetMetaData metaData;
public JDBCAdapter(String url, String driverName,
String user, String passwd) {
try {
Class.forName(driverName);
connection = DriverManager.getConnection(url, user, passwd);
statement = connection.createStatement();
catch (ClassNotFoundException ex) {
System.err.println("Cannot find the database driver classes.");
System.err.println(ex);
catch (SQLException ex) {
System.err.println("Cannot connect to this database.");
System.err.println(ex);
public void executeQuery(String query) {
if (connection == null || statement == null) {
System.err.println("There is no database to execute the query.");
return;
try {
resultSet = statement.executeQuery(query);
metaData = resultSet.getMetaData();
int numberOfColumns = metaData.getColumnCount();
// Get the column names and cache them.
// Then we can close the connection.
for(int column = 0; column < numberOfColumns; column++) {
columnNames.addElement(metaData.getColumnLabel(column+1));
// Get all rows.
while (resultSet.next()) {
Vector<String> newRow = new Vector<String>();
for (int i = 1; i <= columnNames.size(); i++) {
String tempString = resultSet.getString(i);
if(!tempString.equals("null")) {
newRow.addElement(tempString);
else {
newRow.addElement("");
rows.addElement(newRow);
//Modify dataTable to add empty row to separate chassis
if(numberOfColumns>1) {
int nRow = rows.size();
Vector<String> row = new Vector<String>();
for(int i=0; i<numberOfColumns; i++){
row.add("");
if(nRow>0 || numberOfColumns>0) {
//Adding blank row to separate chassis
int i = 0;
while(i<nRow) {
if(!rows.elementAt(i).elementAt(0).equals("")) {
if(i>0) {
rows.add(i, row);
i++;
nRow = rows.size();
i++;
close();
catch (SQLException ex) {
System.err.println(ex);
public void close() throws SQLException {
resultSet.close();
statement.close();
connection.close();
// MetaData
public Vector<String> getColumnNames() {
return columnNames;
public Vector<Vector<String>> getDataTable() {
return rows;
public int getColumnCount() {
return columnNames.size();
// Data methods
public int getRowCount() {
return rows.size();
}

Thank you for your answer.
I'm very new to mySql as server. When I was assigned
to write the application, the administrator has set
up mySql database in the company web server for my
application. My program runs very when using my
workplace desktop with java web start or with java
web start in netbeans (all paths should be link to my
desktop hard disk, i.e. users/application/). I can
not run the application at home because I can not
access to the company intranet server (for security
purpose). The problem happens when I post the
application in the company web page (I have to modify
all paths in jnlp file to the company web address).
The program then runs without exception except it
seems that it gets no data from the database (for
example, when I type my username, it returns that
"There is no such user name. contact.." as what I
code in the application for not correcting user name)
It happens for not only using my company desktop but
also for others.
Please help me.
Thank you in advance.And all this could have been answered yesterday, in your other thread, when I asked you "Is the DB configured to allow that user to connect to the DB from where that user is attempting to connect from?"
Seeing as how you get that error, the obvious answer was, "No." At which point we could have continued.
Configure the needed users into the DB, without forgetting to allow them access from the machines from which they are going to access from.
Although, I agree with Rene, that you should set up a server of some sort, located on the same machine as the DB, for communicating with the DB.

Trouble capturing waveform from PXI-4472

I'm really a very green newbie at this stuff, so bear with me...
I've got a PXI-4472 data acquisition board and a PXI-5411 waveform generator. I've connected the arbitrary out of the 5411 to the channel 0 in on the 4472. An external oscilloscope shows a 1v-amplitude sine wave being generated.
I created a very simple VI to show what the 4472 is capturing. It connects a NI-DAQ channel I generated to the standard "AI Acquire Waveform.vi", then out to a Waveform Chart, all within a while loop with a Stop button. Problem is, all the waveform chart seems to be showing is the running average of the waveform instead of the form itself (solid line, a tad above zero).
I can hook the 4472 input channel up to a DC-out power supply, a
nd when I vary the voltage, the waveform chart changes as well.
So my question (whew!): What's wrong here that's not allowing me to capture a waveform from the 4472 (in turn from the 5411) and display it on my waveform chart?
Thanks in advance for the help.

Never mind.... it was a sample rate problem. I upped the sample rate and it came out ok.

No matter what acct I send an email from it gets sent from my gmail

I only have 2 accts set up on my iPhone: gmail (personal) and bethelmaine.org I can receive email into both accts with no problem, but when I try to reply from my bethelmaine acct the recipient gets it from my gmail acct. I know for a fact the Cc/Bcc, From: line is bethelmaine.org and I also know that the recepient gets it as gmail because I tested it several times by sending to my wife's yahoo acct. This happens when the primary server (under settings: mail, contacts, calendars: accounts) is turned off.
The bethelmaine acct outgoing server is set up in Outlook as smtp.megalink.net. When that is set up as the primary server and turned on I get a message that says "the recipient was rejected by the server" no matter who I try to send to.
Not sure what to do!

It seems pretty clear to me.
When you turn off your primary account the only active account the phone can send via is your Gmail account, and that's what you're seeing.
The question is why do you need to turn off the primary account.. which you answer:
When that is set up as the primary server and turned on I get a message that says "the recipient was rejected by the server
That's because your ISP (megalink) is using access controls to manage who sends mail through their mail server. The first thing they're probably doing is using IP address restrictions - essentially saying they'll only relay mail from any machine on their network (including dialup/DSL/etc. customers), but you're not on their network, you're on an AT&T (or Verizon) 3G connection which isn't in their IP address range, and therefore not valid as far as their mail server is concerned.
The typical solution to this is authentication - by authenticating to their server (via username and password) you identify yourself as a customer and they should relay your messages. So check your phone to ensure that you have authentication enabled for your primary mail account.
If that fails (e.g. they don't support authenticated SMTP) the next option would be to relay the message through your cell provider's mail server - as an AT&T wireless customer you should be able to relay through AT&T's mail server... likewise for Verizon (or whatever national carrier your iPhone is on). You'll need to check with your carrier's site for the specifics of the mail server address to use.

Get waveform from TDS2012

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