Anritsu MT8820A - Page 268

Section 9 Maintenance
9-6
(3) Activation characteristics test
Note:
Perform this test on a location where the ambient temperature change is
within±2°C and no oscillation occur.
[Procedure]
1. Set the frequency counter to use the external frequency standard device.
2. When 24 hours have passed after turning the MT8820A On, measure out-
put frequency from the 10 MHz Buff Out connector of MT8820A using
the frequency counter. The value is read to the 0.1 Hz digit (hereafter,
read the value in the same manner).
3. Turn the power Off after 12 hours, and restart MT8820A.
4. After 10 minutes, measure the output frequency from 10 MHz Buff Out
connector of MT8820A using the frequency counter.
5. Calculate the stability with the following formula.
(Second frequency counter value) − (First frequency counter value)
Frequency stability =
(First frequency counter value)
(4) Aging rate test
Note:
Perform this test on a location where the ambient temperature change is
within ±2°C and no oscillation occur.
[Procedure]
1. Set the frequency counter to use the external frequency standard device.
2. When 24 hours have passed MT8820A On, measure output frequency
from the 10 MHz Buff Out connector of MT8820A using the frequency
counter. The value is read to the 0.1 Hz digit (hereafter, read the value in
the same manner).
3. After 24 hours, measure the output frequency from 10 MHz Buff Out con-
nector of MT8820A using the frequency counter again.
4. Calculate the stability with the following formula.
(Second frequency counter value) − (First frequency counter value)
Frequency stability =
(First frequency counter value)