9.2 Calibration
9-25
9.2 Calibration
9.2.1 Purpose and implementation timing
Perform calibration periodically to prevent MT8820A from deteriorating. Perform
calibration once or twice a year. If the specifications are not satisfied even after the
calibration, contact the Anritsu service department.
9.2.2 Required measurement device
Measurement devices required for the performance test are shown in Table 9-2-2-1.
CAUTION
Warm-up the equipment to be measured and measurement
equipment for at least 30 minutes unless specifically
mentioned and wait until it become stable enough before
starting the performance test. To demonstrate the highest
measurement accuracy, implementation of the test is
required at room temperature, little change in AC power
voltage, and no troubles with noise, oscillation, dust or
humidity.
Table 9-2-2-1 Device list for calibration
Calibration item
Recommended device name
(Anritsu model name)
Performance required for the
device*
Frequency counter (MF2412B) Set range: 100 kHz to 3 GHz
Resolution: 0.1 Hz
External reference input: 10 MHz
Frequency standard device Frequency: 10 MHz
Stability: ±1×10
-9
or less
Calibration for reference
oscillator frequency
PC Ability for controlling GPIB
command
*:
Some parts of the performance covering the measurement range of the cali-
bration items are extracted.
9.2.3 Calibration of reference oscillator frequency
The calibration method of the reference oscillator frequency using the frequency
counter is explained. 10 MHz reference oscillator stability of MT8820A is ±2×10
-8
/
day. As a frequency standard device, use a standard signal generator that receives
standard radio waves or sub-carrier (signal locked to the rubidium atom standard de-
vice) of higher stability and generates a signal locked to the radio waves or sub-
carrier.
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