The Arbitrary Waveform Generator ETC M631 is a hardware and software package that turns your PC to a dual channel generator featuring a generation of analog signals and also digital events defined maximally by 262 144 points. The resolution of a voltage waveform is 8 bit and a width of a digital word is 16 bit. The feature of the digital event generation is available only with the use of the A631 digital adapter, which is not contained the basic package.
Software
The software, included in the package, changes your PC screen into a control panel of a virtual generator and allows an easy access to all its functions by a mouse. It is possible to generate standard waveforms such as sinus, saw, triangle, rectangular and noise that are predefined. There is also an option for a user-defined waveform generation. There are several editors that you can use to define a continuous waveform. The graphical editor, where you can simply draw a signal waveform; the harmonic editor, which synthesizes a signal from harmonic components and the mathematical editor, where you can define a signal as a time function, are parts of a basic package. It is possible to set the signal waveform, level and magnitude of a superponated voltage (an one-directional shift) for each channel independently. An external voltage using external modulation inputs can set amplitude of the output signal. The frequency of a periodical signal of the B channel can be set as an integer multiplication of the channel A frequency. A phase shift between an output voltage of channel A and B can be set too. The editor of digital signals, which is a part of the basic package, defines the sequences of digital words.

The analog and digital signals can be generated in one of the following modes:
- periodical –output signals are generated periodically and they are not influenced by a synchronization input
- synchronized –output signals are synchronizes with a leading or trailing edge of an external synchronization input
- triggered – generates a single period of a defined waveform after a trigger event (a defined part of a synchronization input) occurs
- single – generates a single period after a manual click on a control button on the PC screen
There is an option to buy the development kit - M631 Development Kit which allows users to write own applications for the generator hardware.
Connecting to PC via EPP port
The ETC M631 Generator belongs to the ETC Measuring Lab II (EML II) family. It is connected to PC via parallel port (LPT) working in EPP mode (ver. 1.9) or EPP+ECP. It is possible to connect up to 15 devices of the EML II family while a possibility to connect a printer persists. The M631 is available in two modifications. The internal modification (M631/I) is mounted into PC as if 5¼\" disk mechanics. The power supply is gained using the same connector as for disk mechanics. The external modification (M631/E) is a stand-alone device connected to PC via standard parallel cable with its own power adaptor. Minimum recommended computer requirements are PC486, EPP (V 1.9) or EPP+ECP, 8MB RAM, HD, CD ROM, VGA 800x600, mouse or other pointing device, MS Windows 95/98/ME or NT/2000/XP.
USB Adaptor
USB adapter EC602 offers ability to connect up to 15 devices of ETC Measuring Lab II (EML II) family. Adapter is connected to PC via USB, and its output is connected to EML II device. This solution enables all users of EML II family to connect their devices either via EPP or via USB. Drivers for operating systems Windows 98, Windows ME, Windows 2000 and Windows XP are part of supply.
Basic package M631/E contains:
- EM631/E – external modification of generator
- Power adaptor
- PC connecting cable
- CD ROM containing GENERATOR software
- User’s Guide
Accessories (not included in a package)
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