BIRD Thruline 4304A, Руководство по эксплуатации

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RF Directional Thruline® Wattmeter 4304A
20
2. Connect the calibration equipment as shown in
Figure 10
.
3. Set the range switch to 15 and adjust the RF source to apply 12.5 watts at
100 MHz.
4. Adjust R9 (
Figure 11
) until the 4304A meter indicates 12.5.
5. Measure the actual power for a meter reading of “12.5” for the following
frequencies: 25 MHz, 50 MHz, 80 MHz, 150 MHz, 225 MHz, 400 MHz, 400
MHz, 800 MHz, and 1000 MHz.
6. Calculate the average value of the measurements in Step 5. (Add the
highest and lowest values then divide by 2.)
7. Divide 156.25 by the average value calculated in Step 6 then set the RF
source to this value at a frequency of 100 MHz.
8. Adjust R9 until the 4304A meter indicates 12.5 then wait several minutes
before proceeding to Step 9.
Figure 10 Calibrating the 4304A-1 Element
9. Set the 4304A range switch to 5.
10. Divide 50 by the average value calculated in Step 6 then set the RF source
to this value at a frequency of 100 MHz.
11. Adjust R10 until the 4304A meter indicates 4.0.
12. Set the 4304A range switch to 50.
13. Divide 500 by the average value calculated in Step 6 then set the RF source
to this value at a frequency of 100 MHz.
14. Adjust R8 until the 4304A meter indicates 40.0.
15. Adjust the RF source until the 4304A meter indicates 40.0 at a frequency of
405MHz then record the actual power level at the RF source. This
information will be used in a later step.
16. Set the 4304A range switch to 150.
17. Divide 1562.5 by the average value calculated in Step 6 then set the RF
source to this value at a frequency of 100 MHz.
18. Adjust R7 until the 4304A meter indicates 125.
19. Set the 4304A range switch to 500.
20. Multiply by 10 the actual RF source power recorded in Step 15 (the reading
at “40” taken at 405 MHz). Set the RF source to this calculated value and
the frequency to 405 MHz.