I
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I
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Making Measurements
Measuring Transmission Response
View
and
Interpret
the
Transmission
Measurement
Results
1. To view the entire measurement trace on the display, press
@iiEj
Azttoscale.
2. To interpret the transmission measurement, refer to Figure 3-6 or
your analyzer’s display if you are making this measurement on your
instrument.
a. The values shown on the horizontal axis are the frequencies in MHz.
The values shown on the vertical axis are the power ratios in decibels
(dB)
of the transmitted signal through the device divided by the
incident power. To display the result in logarithmic magnitude format
(designated by “Log Mag” at the top of the measurement screen), the
analyzer computes the measurement trace using the following formula:
Transmission
(dB)
= 10 log
where
Ptrans
=
the power transmitted through the device and
where
Pin=
= the incident power.
b. A level of 0
dB
would indicate a perfect through cable or device (no
loss or gain). Values greater than 0
dB
indicate that the DUT has gain.
Values less than 0
dB
indicate loss.
3. To quickly determine the filter’s minimum insertion loss, press
(MARKERI)
Marker
&arch
Max
Search Mkr
->
Max.
3-22
4. Note the marker readout in Figure 3-6 provides the frequency and
amplitude of the minimum insertion loss point.
深圳市盛腾仪器仪表有限公司 Tel:0755-83589391 Fax:0755-83539691 Website: www.Sengt.com
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