#### Step 3 - Define Ports

The example described in this documentation has a PA25-SH insert in Port 1(left), NO INSERT in Port 2 (middle), and a PA25-20 insert in Port 3 (right).

To define the ports of your FCR25 Probe Changer, follow these steps:

1. Select TYPE=FCR25 from the Active Probe Changer list.

2. In the Number of Slots box, specify in multiples of three the number of ports your FCR25 probe changer(s) will have. PC-DMIS then lists the specified number of ports as "slots" (for example Slot 1, Slot 2, Slot 3, and so forth). Until you define the ports these "slot" entries will display "UNDEFINED".

Probe Changer dialog box - Slots tab showing undefined slots

3. Select a slot from the list and click Edit Slot Data. This opens the Probe Changer Slot Data dialog box.

Probe Changer Slot Data dialog box

4. Select NO INSERT, PA25-SH, or PA25-20 from the Slot Type list.

5. You may specify the XYZ values for the center position of the port or leave those values empty. In any case, PC-DMIS will automatically populate these values upon successful calibration. See "Step 9 - Review Calibration Results".

6. Click OK to save changes to slot data. Repeat steps 3 through 5 for all ports in your changer.

Probe Changer dialog box - Slots tab

7. Click Apply to save your changes.

You are now ready to begin calibration. In the next step you will start the calibration procedure.

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