Agilent Technologies HP 70910A Guide de l'utilisateur télécharger pdf (Page 55)

Chapter 3 55

Operation

Operating Hints

Operation

Remote Location of an 11974

In cases where the device-under-test (DUT) is farther away than the 1 meter LO and IF

cables can accommodate, place the 11974 close to the DUT, but place the host spectrum

analyzer the desired distance away. In order to preserve the excellent amplitude accuracy

of the 11974, the +14.5 to 16 dBm LO power must be supplied even though the LO cables

may become quite long.

To supply the LO power, insert an 11975A Amplifier at the 11974 location. (Refer to Figure

3-4. on page 56.) To provide the proper input power level for the 11975A Amplifier, a coax

attenuator is also required at the input of the 11975A such that the sum of the loss of the

extended LO cable and the attenuator value add up to a range of 9–11 dB at 6 GHz. Set the

OUTPUT POWER LEVEL on the 11975A for +16 dBm. The extra IF cable loss at 321 MHz

should be added to the conversion loss value of the 11974. Perform the Frequency Tracking

Calibration procedure after connection of all cables.

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Agilent Technologies HP 70910A Guide de l'utilisateur Page 55