Ken,
The 2-trace, unshielded ports, black unit is usually delivered uncalibrated and is not useable out of the box. The following usually gets it going:
First select "RESET" under the "CAL" menu and then perform the normal calibration procedure and save to location "0".
On a Windows PC you need to select a firmware with the .dfu extension for use with the flash utility when upgrading your device.
Herb
