You just need to add the class to your Visual Basic project. With this class it becomes very easy to write your own applications for the VC-940 multimeter. So I started researching the information available, and I created my own Visual Basic. Voltcraft provides some information about the data protocol that is used for the data transfers, but the information is rather poor. Voltcraft provides some software to watch the data on your computer, but the RS-232 interface is even more interesting for people that want to write their own software. The multimeter also has an optical RS-232 interface to download the measured values to your computer. The meter has a very good price/quality ratio. This is a very complete 40000 count multimeter that even comes with a power adapter to perform power measurements (Watt). I recently bought a Voltcraft VC-940 multimeter.
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