Chapter 15 291
Functional Tests
Before Performing a Functional Test
Before Performing a Functional Test
1. Ensure that you have the proper test equipment.
2. Switch on the unit under test (UUT) and let it warm up (in accordance with 
warm-up requirements in the instrument specifications).
3. Allow sufficient warm-up time for the required test equipment (refer to 
individual instrument documentation for warm-up specifications).
4. Ensure that the analyzer’s frequency reference is set to Internal:
a. Press the 
Input/Output, More, Freq Ref In keys. 
b. If the 
Freq Ref In softkey does not show Internal, press the Freq Ref In 
softkey and select 
Internal.
5. Following instrument warm-up, perform the auto align routine:
Press 
System, Alignments, Align Now, All.
NOTE Functional test accuracy depends on the precision of the test equipment used. 
Ensure that all of the test equipment is calibrated before running a functional test.