深圳市朗普电子科技有限公司
Operating Instructions
15
Measuring
Power in dBm
Operation of the forward and reflected dBm modes is
identical to the forward and reflected CW power modes,
except that the resulting reading is converted to dB above 1
milliwatt before it is displayed. It should be noted that in
doing this conversion, the range set on the slide switches is
assumed to be watts rather than kilowatts or milliwatts. If it
is not, 30.0 must be added to all dBm readings when the
range is in kilowatts, or subtracted from all readings when it
is in milliwatts. An error message is displayed if CW power
is more than 24 dB below, or peak power is more than 6 dB
above the nominal element range. Refer to Table 4.
Table 4
Watts/dBm
Equivalents
Measuring
Return Loss
The measurement of return loss is the same as that of SWR
except that the result is displayed in dB. In other words a
reading of 21.65 indicates that reflected power is 21.6 dB
down from forward power.
Figure 11
CW Power in
dBm
Power
dBm
Power
dBm
1 milliwatt
0
4 watts
36
10 milliwatts
10
10 watts
40
100 milliwatts
20
20 watts
43
1 watt
30
40 watts
46
2 watts
33
100 watts
50
Figure 12
Return Loss,
Insertion
Loss, or
Attenuation
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FAX:0755-88850158
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深圳市朗普电子科技有限公司
TEL:0755-88851600
FAX:0755-88850158
