Section 9 Maintenance
9-14
7. Set the frequency for MT8820A to30 MHz and the power sensor correcti-
on coefficient in the measurement frequency for the power meter.
8. Measure the output level using power meter and record the result.
9. Change the frequency and repeat the operations in steps 7. to 8.
(4) Output level accuracy test
[Procedure]
1. Setup the equipment as shown in Fig. 9-1-8-2.
2. Connect MT8820A 10 MHz Buff Out connector to the external reference
input of receiver for calibration and perform the frequency synchroniza-
tion.
3. Set the resolution band width of the receiver for calibration to 1 Hz and
perform the calibration (error between the ranges) for receiver on each
measurement frequency beforehand.
4. Set the frequency of MT8820A and receiver for calibration to 30 MHz.
5. Set the MT8820A output level to −10 dB and measure the level using the
measurement device for calibration.
6. Add the variation with level measurement value when output level of
MT8820A is −10 dBm to the value recorded in the output level frequency
characteristics test.
[Level error] = [Level measurement value] − [Level measurement
value at −10 dBm]+ [Recorded value in the above-mentioned output
level frequency characteristics test at identical frequency]
7. Change the output level and repeat the operations in steps 5. to 6.
8. Change the frequency and repeat the operations in steps 3. to 6.
Note:
On the performance test for AUX1; change the connection destination to
AUX1, and RF Output of MT8820A to AUX using System Config. Then, per-
form the frequency characteristics measurement, and output level accuracy
measurement.
At that time, set the initial value of MT8820A output level to 0 dBm.
Calculation formula is as follows:
[Level error] = [Level measurement value] − [Level measurement
value at 0 dBm] + [Recorded value of output level frequency char-
acteristics test at identical frequency]
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