Agilent Technologies N9340A manual dBm, Press FREQ Start Freq 100 MHz, Press FREQ Stop Freq 1 GHz

3 Making Measurements

2Connect the tracking generator output of the analyzer to the directional bridge or coupler.

3Connect the analyzer input to the coupled port of the directional bridge or coupler.

4Press [Preset] to perform a factory preset.

5Turn on the tracking generator and if necessary, set the output power to –10 dBm:

		Press [Mode] > {Track Generator} > {Amplitude (On)} >
		–10 > {dBm}
	Excessive signal input may damage the DUT. Do not
C ACUATUI O- N
	exceed the maximum power that the device under test can
	tolerate.
	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 display the results in trace 1.

The normalized trace or flat line represents 0 dB return loss. Normalization occurs each sweep. Replace the short circuit with the DUT.

	Since the reference trace is stored in trace 4, changing
N O T E
	trace 4 to Clear Write invalidates the normalization.

52 N9340A User’s Guide