Anritsu MS8608A, Operation Manual, Page: 119 / 338

Section 6 Performance Tests
6-7
(3) Setup
OUTPUT
Frequency standard
FREQ STD
10 MHz IN
INPUT
Frequency counter
MF1601A
10 MHz STD
Buff Out
Reference Oscillator Frequency Stability Test
(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 front panel to On.
3
Measure the frequency using the counter after 24 hours has passed after turning the power
ON.
(Sample rate of the counter:
≥
20 sec, read out 0.1 mHz resolution)
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)