Anritsu MS8608A, Operation Manual, Page: 120 / 338

Section 6 Performance Tests
6-8
Temperature stability: Test this performance in a vibration-free constant-temperature
chamber.
Step Procedure
1
Set up the MS8608A/MS8609A in a constant-temperature chamber at 25
°
C in the same setup.
2
Set the LINE and Power switches on the MS8608A/MS8609A to On and wait until the
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
mHz resolution.
4 Change the chamber temperature to 50
°
C.
5
When the chamber temperature and the MS8608A/MS8609A internal temperature re-stabi-
lize, measure the frequency by using the counter.
6 Calculate the stability by using the following equation.
(counter reading at 50
°
C) – (counter reading at 25
°
C)
(counter reading at 25
°
C)
Temperature stability =
7 Change the chamber temperature to 0
°
C and repeat steps 5 and 6.
Rubidium reference oscillator frequency stability (Option 05)
The 10 MHz Rubidium reference oscillator of Option 05 is tested for frequency stability.
Starting characteristic is determined by measuring frequency variation after 7 minutes
and then after 1 hour of power on at ambient temperature of 25
°
C, and also the frequency
variation (temperature stability) is measured at ambient temperature of 0
°
C and 45
°
C.
(1) Specifications
■
Rubidium reference oscillator (Option 05)
• Frequency: 10 MHz
• Aging rate:
≤
1
×
10
–10
/month
• Starting characteristic:
≤ ±
1
×
10
–9
/7 min. (referred to frequency at 25
°
C)
• Temperature stability:
±
5
×
10
–9
at 0 and 45
°
C (referred to frequency at 25
°
C)