SECTION 6 PERFORMANCE TESTS
6-8
(4) Procedure
Aging rate/day: Test this at the ambient temperature ±2˚C in a vibration-free place.
Step Procedure
1 Set the change over switch (FREQ STD: INT/EXT) on the MF1601A counter rear panel to
EXT.
2 Set the power supply switch on the spectrum analyzer rear panel to On and then the Power
switch on the spectrum analyzer front panel to On.
3 Measure the frequency using the counter with 0.1 Hz resolution after 24 hours have passed
after turning the power ON.
4 Measure the frequency using the counter after 24 more hours have passed from the step 3
measurement.
5 Calculate the stability by using the following equation.
Frequency stability =
(2nd reading of the counter) – (1st reading of the counter)
(1st reading of the counter )
Temperature stability: Test this performance in a vibration-free constant-temperature chamber.
Step Procedure
1 Set up the spectrum analyzer in a constant-temperature chamber at 25˚C in the same setup.
2 Set the LINE and Power switches on the spectrum analyzer to On and wait until the spectrum
analyzer internal temperature stabilizes (approx. 1.5 hours after the chamber temperature
stabilizes).
3 When the internal temperature stabilizes, measure the frequency by using the counter with 0.1
Hz resolution.
4 Change the chamber temperature to 50˚C.
5 When the chamber temperature and the spectrum analyzer internal temperature re-stabilize,
measure the frequency by using the counter.
6 Calculate the stability by using the following equation.
Te mpe ra ture sta bility =
(counter reading at 50˚C) – (counter reading at 25˚C)
(counter reading at 25˚C)
7 Change the chamber temperature to 0˚C and repeat steps 5 and 6.
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