Lascar usb data logger voltage lascar el usb 3 the lascar el usb 3 is a voltage data logger that will collect up to 32 510 voltage readings over a 0 to 30v dc range the collected data is simply downloaded to a pc via a usb port where it can be analysed printed or exported to other programs using the included purpose designed software the unit may also be set up via the software so that logger name measurement rate high and low alarms and start date and time may be adjusted to the requ