SHORT GUIDE TO WEBLAB

You’ll need to register before using WebLab.

Affiliation = Student

Requested Group = Guest Users

You can give our course number and refer to PSU in the notes section.

They will email you when the account is set-up.

GETTING TO WEBLAB

On the lab computers it will run under Mozilla Firefox if pop-ups are disabled. (May already be done on your machine.)

If you are doing it from home you need to have Java version 1.4.2 or higher.

Go to http://ilab.mit.edu

Documentation is available there.

You can use the links to weblab or the documentation from WebCT, however you probably need to enter WebCT from Mozilla for it to work.

LOGIN

DEVICE: choose the right device.

SETUP

Set up your SMUs. See manual for details. It does give you good error messages, so it is easy to get it set up by playing with it a bit. Tips:

Click on each SMU to set it up.

Just moving your mouse over the SMU shows the settings.

You have to name the variables, even if you aren’t going to use them.

VAR1 will be your main sweep variable, or in other words your x axis.

You will need to check the box to download the variables of interest.

If you want to set something to ground, or another constant set your “Mode” to COMM.

MEASUREMENT

Run measurement.

It will automatically display the graph. Play with the variables until you have the output you desire.

Save the set-up if desired.

For your final data output you want a fairly fine grid so as to not cause discontinuities in curve fitting.

RESULTS

Download data.

CURVE FITTING: Load the data into MATLAB for curve fitting. It is possible to use Excel, but more difficult.

Request an account on MIT Weblab

Betsy Natter

2006-01-24T17:31:00