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SECTION 8 CALIBRATION
8-2
8.3 Calibration
For the MG3641A/MG3642A, calibrate the frequency of the built-in Reference oscillator once a half year.
The stability of the MG3641A/MG3642A 10 MHz reference crystal oscillator is ±5 × 10
-9
per day. Therefore, as the
frequency standard, use a standard signal generator that receives the typical radio wave and subcarrier of the color
telecasting (signal locked to the rubidium atomic standard) and issues a signal locked to it.
(1) Calibration specifications
• Reference oscillator (standard)
– Frequency 10 MHz
– Aging rate ±5 × 10
-9
/day
– Activation characteristics 1 × 10
-7
/10 min. (reference after 24 hour operation)
– Temperature characteristics ±3 × 10
-8
(0 to 50°C)
• Reference oscillator (Opt 01)
– Frequency 10 MHz
– Aging rate 5 × 10
-10
/day
– Temperature characteristics ±5 × 10
-9
(0 to 50°C)
(2) Measuring instruments for calibration
• Oscilloscope
• Frequency standard