Anritsu MS8608A, Operation Manual, Page: 118 / 338

Section 6 Performance Tests
6-6
Performance Test
The warm-up time depends on the test item. For test item other than oscillator frequency,
warm-up the equipment for at least for thirty minutes and test the performance after the
MS8608A/MS8609A stabilizes completely. Also, begin measurement after taking the
warm-up time of the calibration instrument into full consideration. In addition, the test
must be conducted at room temperature; there must be little AC power supply voltage
fluctuation, and no noise, vibration, dust, humidity, etc.
Reference oscillator frequency stability
The 10 MHz reference oscillator is tested for frequency stability.
Stability is determined by measuring frequency variation after 24 hours and after 48
hours of power on at ambient temperature of 25
°
C, and frequency variation at ambient
temperatures of 0
°
C and 50
°
C.
(1) Specifications
■
Reference oscillator
• Frequency: 10 MHz
• Aging rate:
≤
2
×
10 -8 /day
After 24 hour warm-up at 25
°
C
±
5
°
C
• Temperature stability:
±
5
×
10
-8
at 0 and 50
°
C referred to frequency at 25
°
C
(2) Test instruments
• Frequency counter: MF1601A
• Frequency standard: with accuracy of
≤ ±
5
×
10
-13
/day