This section introduces an example of how to detect the location of a mismatch that occurs in a cable by using the time domain function.
In this example, a DUT is evaluated according to the steps.
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Step |
Description |
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Set the measurement conditions. |
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Execute calibration. |
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Connect the DUT. |
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4. Auto Scale |
Execute auto scale. |
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Set the time domain function. |
Follow these steps to set the measurement conditions:
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Setting Description |
Key Operation |
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Presetting |
Preset > OK |
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Stop frequency: 3 GHz |
Stop > 3 > G/n |
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Number of points: 201 |
Sweep Setup > Points > 2 > 0 > 1 > x1 |
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Specifying the low-pass mode sweep condition |
Analysis > Transform > Set Freq Low Pass |
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Measurement parameter: S11 |
Meas > S11 |
By following 1-Port Calibration (reflection test), execute 1-port calibration on port 1.
Connect the DUT as shown below.
Execute the auto scale function.
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Setting Description |
Key Operation |
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Executing auto scale |
Scale > Auto Scale |
Set the conversion function to display the response in the time domain. If you enable this setting, the response in time domain is displayed as shown figure below. A peak indicating a small mismatch appears at the location of the connector.
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Setting Description |
Key Operation |
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Data format: real |
Format > Real |
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Setting the transformation type to low-pass impulse |
Analysis > Transform > Type > Lowpass Imp |
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Setting the window type to maximum. |
Window > Maximum |
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Setting the display range: from 0 s to 20 ns |
Start > 0 > x1 |
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Stop > 2 > 0 > G/n |
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Enabling the transformation function |
Transform (set to ON) |
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Executing auto scale |
Scale > Auto Scale |
