This compact PC-driven sampler
monitors voltage changes over periods ranging from milliseconds
to months. It can also be used as a simple low frequency digital
scope to examine audio and other signals up to 5KHz. No batteries
are required as it is powered from the computer's parallel port.
Specifications:
Connects to the PC parallel port.
Will sample 0-2V or 0-20V at intervals of once per hour, down
to once every 100uS.
Entire circuit is contained in an extended D-Shell case (included).
Includes Windows software.
Resolution is 10mV on the 2V scale, and 100mV on the 20V scale.
Records one channel of data.