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3.5.5.
Bandwidth Test
The bandwidth test function is mainly used to test the bandwidth of the band pass filter.
The signal peak within the pass band can be found in the bandwidth test. Two points are respectively located at the specific amplitude
on both side of the pass band. The amplitude amplitude is lower than the signal peak and can be adjusted by setting the NdB point
(default setting: 3dB). The frequency range between the two points is the bandwidth of the tested filter.
The minimum bandwidth and maximum bandwidth allowed by the user can be set before the bandwidth test. The actual bandwidth will
be automatically compared with the above two values. In case of nonconformity, the FAIL information will be provided on the screen or
the sound will be utters, so that the user can intuitively check whether the properties of the tested device conforms to the
requirements.
3.5.5.1.
Enabling and Setting of Bandwidth Test
Set the bandwidth threshold (NdB point), maximum bandwidth and minimum bandwidth before the bandwidth test. Several tracks can
be set.
1) Menu path: [Analysis] > [Test] > [BW test]. The test dialog box will appear.
2) Tick the [Bandwidth test on/OFF] check box in the dialog box to enable the bandwidth test.
3) Tick the [Bandwidth Value on/OFF] check box in the dialog box to display the tested bandwidth on the screen.
4) Tick the [Bandwidth Marker on/OFF] check box in the dialog box. The bandwidth location mark will be displayed on the screen.
5) Click the [NdB point] box to set the bandwidth threshold.
6) Click the [Min bandwidth] box to set the minimum bandwidth.
7) Click the [Max bandwidth] box to set the maximum bandwidth.
8) Tick the [Sound ON Fail on/OFF] check box in the dialog box. The sound prompt will be provided in case of failure of the
bandwidth test.
9) Tick the [FAIL sign on/OFF] check box in the dialog box. The FAIL prompt will be provided in case of failure of the bandwidth test.
10) Click [OK]. Thus the bandwidth test setting is completed.
Fig. 3.53 Dialog Box of Bandwidth Test
3.5.5.2.
Display of Bandwidth Test Results
Bandwidth test results will be displayed in the upper left corner of the trace. If the test results are acceptable, "ASS" will be displayed.
