PWRGRAPH ON OFF

PWR SWP ON OFF

Spectrum Analyzer Mode Key Descriptions

Spectrum Analyzer Mode Functions

turns the channel power graph ON or OFF. With the PWRGRAPH ON, the channel powergraph is calculated and displayed and the numeric results are not displayed. The value of the channel power is displayed at the selected marker frequency. This graph function is used after doing a channel power measurement with the CHANNEL POWER softkey.

Front-Panel Key Access (jMEAS/USER]

option 011 only.

activates (ON) or deactivates (OFF) the power-sweep function, which sweeps the output power of the tracking generator over the selected power-sweep range. The value of the power-sweep range is displayed in the active-function block when PWR SWP ON OFF is turned on. The available power-sweep range is a function of the source attenuator setting: For power sweeps, press SRC ATN MAN AUTO until (MAN) is underlined so the analyzer source attenuator is manually set (decoupled). For a given source attenuation setting, the maximum specified power-sweep range is given by the following:

Power Sweep Range for the HP 8591C cable TV analyzer is (34 dBmV minus the source attenuation setting) to (49 dBmV minus the source attenuation setting). For example, if the source attenuation setting is 20 dB, the maximum power sweep range is from 14 dBmV (34 dBmV - 20 dB) to 29 dBmV (49 dBmV - 20 dB). The starting power level is the source power setting. The ending power level is the sum of the source power setting plus the source power sweep setting. Source power sweep may be set as high as 20 dB, but performance is specified only up to 15 dB.

The output power of the tracking generator is swept according to the sweep rate of the analyzer. The output power is always swept from the source power setting to a higher power setting (negative source power sweep values are not allowed). Refer to the calibration guide for your instrument for more information regarding source power and source attenuation relationships.

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