Re: I change dt, but should the frequency change???
Hi, first of all you don't need to create signals in loops like you did it in your example. You can use signal generation VIs, which will do all the job for you, from Functions->Analyze->Waveform generation or Functions->Analyze->Signal Processing->Signal Generation palettes. As for your question you need to use dt LESS then 1/(200*2)=2.5 ms. This is very simple. If frequency is 200 Hz then the period of signal is 5 ms. To generate this signal you need at least 2 points corresponding to its maximum and minimum so the minimal value of dt is 2.5 ms. If you want to generate goodlooking sin wave you need more then 10 points on one period. So if your waveform has N points and corresponds to K periods (N/K > 2) of the wave with frequency F then dt=(K/N)/F. Good luck. Oleg Chutko.
Re: write xy graph to png with labview 7
Hi, If you need to save the image of your control then look http://exchange.ni.com/servlet/ProcessRequest?RHIVEID=101&RPAGEID=137&HOID=506500050015010100&HTHREAD=65813&UCATEGORY_0=_49_%24_6_&UCATEGORY_S=0";>here, where I described how to do it. There is an example which saves the image of control to JPG file. To save image to PNG file you need to replace "Write JPG File.vi" with "Write PNG File.vi" from Functions->Graphics&Sound->Graphics Formats palette. Good luck. Oleg Chutko.
Re: Hi!!how can I build a vi with every number of inputs?
Hi, one of the typical solutions is to use clusters. You can create one cluster input for your vi with many elements inside. These elements colud be of different types. With such solution you can create inside cluster much more then 28 input elements. Good luck. Oleg Chutko.
Re: Y axis position
Hi, if you want to show Y scale at the right side of your graph instead of its ordinary position at the left you must do the following things: Right click on the title of the scale and select "swap sides" option from pop-up menu. Good luck. Oleg Chutko.
Re: What is anti-aliasing?
Hi, anti-aliasing is smoothing. This term is usually used in computer graphics. In graphics anti-aliasing is used to smooth some distortions on the pictures (for example big squares in zooming). As every smoothing anti-aliasing is some kind of lowpass filter. So I think that advise was to perform some filtering to remove highfrequensy components from your signal. Good luck. Oleg Chutko.
Re: subVI indicator initialize
Hi, look http://exchange.ni.com/servlet/ProcessRequest?RHIVEID=101&RPAGEID=135&HOID=5065000800C3D3&USEARCHCONTEXT_CATEGORY_0=_49_%24_6_&USEARCHCONTEXT_CATEGORY_S=0&UCATEGORY_0=_49_%24_6_&UCATEGORY_S=0";>here Good luck. Oleg Chutko.
Re: fake COM1 data
Hi, to do it you need a "serial loopback plug". This plug conects some COM port pins in a way which allows you to send data to this port and read them using the same port. Actually this is the loop which connects "receive" and "transmit" carriers of the same port. Such loops are usually used for port testing. You can buy this loop somewhere or you can make it yourself. Read more about loopback and how to make it http://www.passmark.com/support/loopback.htm";>here. Also there are many other places in internet where oyu can find information. Good luck. Oleg Chutko.
Re: Serial port with VISA
Hi, 1. You must setup VISA drivers first. It is ussual problem when someone tries to use VISA functions without installed driver. To install driver you must run your Labview install disc and check this option there. 2. Also check if your COM ports are enabled in BIOS and in Control Panel->System->Device manager. 3. And then check how VISA works in MAX. Good luck. Oleg Chutko.
Re: How can I automatically word wrap a string placed in a (multicolumn) listbox ?
Hi, To compute the sizes of text written using some font you can use "Functions->Graphics & Sound->Picture Functions->Get Text Rect.vi". In this function you can specify the font name, its size, and some options (italic, bold, etc.). Good luck. Oleg Chutko.
