Aeroflex 3500A, Maintenance Manual, Page: 46 / 169

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S u b j e c t t o E x p o r t C o n t r o l , s e e C o v e r P a g e f o r d e t a i l s .
C. TCXO Verification
TEST EQUIPMENT: Frequency Counter
1. Press POWER Key to turn ON the Test Set. Allow Test Set to warm up before continuing
with Verification Procedure.
2. With the System Menu displayed, press the 2 Key to display the Receiver Test Screen.
3. Move the cursor to the MHz: field.
4. Press the F1 “Edit” Key to highlight the field. Press the 5 Key and 0 Key twice to set the
field to 500 MHz. Press the F1 “Done” Key to store the setting.
5. Move the cursor to the Port: field.
6. Press the F1 “Edit” Key to highlight the field. Using the Arrow Keys (   ), select SWR.
Press the F1 “Done” Key to store the setting.
7. Move the cursor to the Level: field.
8. Press the F1 “Edit” Key to highlight the field. Press the ± Key and 5 Key to set the field to
-5.0 dBm. Press the F1 “Done” Key to store the setting.
9. Connect the Frequency Counter to the SWR Connector.
10. Record the Frequency Counter reading.
11. Calculate the TCXO Error by subtracting 500 MHz from the Frequency Counter reading.

If error is > ± 500 Hz, the Test Set is out of specified limits and must be calibrated.
 If error is >
±
150 Hz, the Test Set should be calibrated to insure correct operation over
temperature.