Agilent Technologies N9340A Guide de l'utilisateur télécharger pdf (Page 74)

4 Making Measurements

68 N9340A User’s Guide

2 Connect the tracking generator output of the

analyzer to the directional bridge or coupler.

3 Connect the analyzer input to the coupled port

of the directional bridge or coupler.

4 Press [Preset] to perform a factory preset.

5 Turn on the tracking generator and if necessary,

set the output power to –10 dBm:

Press [Mode] > {Track Generator} > {Amplitude (On)} >

–10 > {dBm}

6 Set the start and stop frequencies and resolution

bandwidth:

• Press [FREQ] > {Start Freq} > 100 > {MHz}

• Press [FREQ] > {Stop Freq} > 1 > {GHz}

• Press [BW/Avg] > {RBW} > 1 > MHz

7 Replace the DUT with a short circuit.

8 Normalize the trace:

Press [MEAS] > {Normalize} > {Store Ref (1-> 4)}>

{Normalize (On)}

This activates the trace 1 minus trace 4 function

and displays the result in trace 1.

The normalized trace or flat line represents 0

dB return loss. Normalization occurs with each

sweep. Replace the short (cal device) with the

DUT.

CAU-CAUTION

Excessive signal input may damage the DUT. Do not

exceed the maximum power that the device under test can

tolerate.

NOTE

Since the reference trace is stored in trace 4, changing

trace 4 to Clear Write invalidates the normalization.

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Agilent Technologies N9340A Guide de l'utilisateur Page 74