China Electronics Technology Instruments AV3672 Series, User Manual

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6 Measurement Optimization
6.3 Increase of Dynamic Range
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➢
Insert one 10dB attenuator between the output of the DUT and the analyzer after one-port calibration.
➢
Directly connect the output of the DUT to the analyzer after 2-port measurement calibration.
6.3 Increase of Dynamic Range
The dynamic range refers to the difference between the maximum power allowed to be input into the analyzer and
the minimum power (base noise) which can be tested. To make the measurement correct and effective, the input
signal must be within the dynamic range. In order to greatly change the signal amplitude of measurement, such as
the filter passband and stop-band, it is important to increase the dynamic range. Fig. 6.3 is a typical dynamic range
of measurement.
Fig. 6.3 Dynamic Range
In order to reduce the instability of measurement, the dynamic range of the analyzer should be larger than the
response of the DUT. For example, the accuracy can be improved if the response of the DUT is at least 10dB more
than the base noise. The following methods can help to increase the dynamic range.
Attention
Dynamic range and measurement time
As some analyzers have the characteristics of alternating sweep, the dynamic range can be increased so as to
increase the measurement time.
6.3.1 Increase of Input Power of Device
1) The input power of the DUT can be increased so that the output power of the DUT can be accurately tested and
measured by the network analyzer.
2) If the input of the receiver is too high, compression distortion may be caused. If the input reaches to a certain
degree, the receiver may be damaged.
Warning
If the input level r15dBm, the receiver may be damaged.
Attention
Do not apply the maximum source output power.
If the test equipment has gain, the maximum source output power cannot be applied; otherwise, the receiver may be
damaged.
Menu path: [Stimulus] > [Power] . The power shortcut key is set on the auxiliary menu bar and front panel.
Input the power value directly in the input toolbar, or click [Power...] to set the power in the dialog box.
6.3.2 Reduction of Base Noise of Receiver