Anritsu MD8470A, Operation Manual, Page: 90 / 114

(5) Temperature stability test
Note:
Perform this test in a constant temperature tank free from vibra-
tion.
[Procedure]
1. During setup, set only the MD8470A in the constant temperature
tank (see the connection diagram shown in Fig. 4.1.4-1). Set the
tank temperature to 25
°
C.
2. Turn on the MD8470A and wait until the temperature inside the
MD8470A is stabilized. (It takes about 1.5 hours until the tank
temperature becomes stable.)
3. After the temperature inside the MD8470A becomes stable, measure
the output frequency of the 10MHz Buff Output connector on the
MD8470A using the frequency counter. Read values to the 0.1 Hz
digit (same for other measurements below).
4. Set the tank temperature to 40
°
C.
5. When the temperatures inside the tank and for the MD8470A be-
come stable, measure the output frequency of the 10MHz Buff Output
connector on the MD8470A using the frequency counter.
6. Calculate stability using the equation below.
(Frequency counter value at 40
°
C) – (Frequency counter value at 25
°
C)
Frequency
stability
=
(Frequency counter value at 25
°
C)
7. Set the tank temperature to 5
°
C.
8. When the temperatures inside the tank and for the MD8470A be-
come stable, measure the output frequency of the 10MHz Buff Output
connector on the MD8470A using the frequency counter.
9. Calculate stability using the equation below.
(Frequency counter value at 5
°
C) – (Frequency counter value at 25
°
C)
Frequency
stability
=
(Frequency counter value at 25
°
C)
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