#### Step 4 - Begin Calibration

Before you start calibration, you must specify/verify the probes that will be used.

Probe Changer dialog box - Calibrate tab

To specify the probes used in the calibration of your FCR25 Probe Changer, follow these steps:

1. Select the Calibrate tab from the Probe Changer dialog box.

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

3. Determine the type of calibration. Select either the Single Port Calibration option to calibrate one port or the Full Calibration option to calibrate all FCR25 ports. If you select the Single Port Calibration, you must also select the needed port from the Probe Changer Port list. This documentation describes the Full Calibration option.

4. Select the currently attached probe that defines the current probe configuration from the Active Probe File list, and select the current tip from the Active Tip list.

5. If any ports require a secondary probe file to pick up that type of stylus, select the required probe file that defines the secondary probe configuration from the Second Probe File list. Then select the needed tip from the Second Tip list. For example, a PA25-20 insert would require you to specify something like the SO25TP20_3 to accommodate the size of stylus used with the insert.

6. Click Calibrate when you are ready to begin calibration.

In the next step, you will prepare the probe changer for calibration.

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