Teledyne LeCroy QPHY-USB - Manual (Page 11)

QPHY-USB Software Option
QPHY-USB Operator’s Manual Rev F
11
The fixture requires a 5 V power supply for operation. The fixture can be supplied from either a DC adapter or
USB port and is selectable from a jumper on the fixture. When the jumper is placed over pins 2 and 3, the power
is supplied from the USB port (default setting); when placed over pins 1 and 2, the power is supplied from the DC
adapter. The following figure shows the jumper set so the board receives power from the USB port.
Figure 3. TF-USB-B Showing Power Supply Selection Jumper
The USB test fixture has square pins that provide connection points for differential and single-ended probes. The
pins are connected to the “+” and “-“ signal lines and a pair of ground pins are also provided.
Note: Use probes as indicated. All unnecessary probes for a given test must be removed.
Ground Pins
Figure 4. Probe Connection Pins Showing Grounds