Anritsu MS8608A, Руководство по эксплуатации, Страница: 121 / 338

Section 6 Performance Tests
6-9
(2) Test instruments
• Frequency counter: MF1601A
• Frequency standard: with accuracy of
≤ ±
5
×
10
-13
/day
(3) Setup
OUTPUT
Frequency standard
FREQ STD
10 MHz IN
INPUT
Frequency counter
MF1601A
OPT 05 Out
(10 MHz)
Rubidium reference Oscillator Frequency Stability Test
(4) Procedure
Starting characteristic: 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 7 minutes 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 1 more hour have passed from the step 3
measurement.
5
Calculate the Starting characteristic by using the following equation.
Starting
characteristic
=
(reading of the counter after 7 minutes) – (reading of the counter after 1 hour)
(reading of the counter after 1 hour)