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Mình đang dịch tài liệu về máy đo của Bird Elec. Có 2 chỗ mình chưa hiểu thật kỹ:
"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"
Trong đoạn trên mình chưa hiểu nghĩa của down from là gì, các bạn ai hiểu giúp mình nhé!
Attenuation or insertion loss can be measured directly using an external single port line section (P/N 4230-006-1), a dc feed-in adapter (P/N 4381-050), and a dc cable (P/N 3170-058-6). The Model 4391A is inserted at the source end of the device being measured. The second line section is inserted at the load end and its dc output is routed by the dc cable to the adapter inserted in the REFLECTED socket of the Model4391A. Both elements are in this case pointed in the direction of forward power flow. If the two elements do not have a ten to one ratio, a correction factor must be added to or subtracted from the “return loss” reading see Table 6, depending on the ratio of the elements
Các bạn ai biết xin giúp mình dịch đúng đoạn này, mình ko hiểu đúng được đoạn này. Xin cảm ơn các bạn đã xem qua.
"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"
Trong đoạn trên mình chưa hiểu nghĩa của down from là gì, các bạn ai hiểu giúp mình nhé!
Attenuation or insertion loss can be measured directly using an external single port line section (P/N 4230-006-1), a dc feed-in adapter (P/N 4381-050), and a dc cable (P/N 3170-058-6). The Model 4391A is inserted at the source end of the device being measured. The second line section is inserted at the load end and its dc output is routed by the dc cable to the adapter inserted in the REFLECTED socket of the Model4391A. Both elements are in this case pointed in the direction of forward power flow. If the two elements do not have a ten to one ratio, a correction factor must be added to or subtracted from the “return loss” reading see Table 6, depending on the ratio of the elements
Các bạn ai biết xin giúp mình dịch đúng đoạn này, mình ko hiểu đúng được đoạn này. Xin cảm ơn các bạn đã xem qua.
