Stimulus Functions

S T I M U L U S W

pg61 17d

Figure 6-5. Stimulus Function Block

The stimulus function block keys are used to define the source RF output signal to the test device by providing control of the following parameters:

nswept frequency ranges

ntime domain start and stop times (Option 010 Only)

npower sweep start and stop values

nRF power level and power ranges

nsweep time

nsweep trigger

nnumber of data points

nchannel and test port coupling

nCW frequency

w sweep type

Defining Ranges with Stimulus Keys

The ml, IstopJ, (Center), and&ZJ keys are used to dellne the swept frequency range, time domain range (Option OlO), or power sweep range. The range can be expressed as either start/stop or center/span. When one of these keys is pressed, its function becomes the active function. The value is displayed in the active entry area and can be changed with the knob, step keys, or numeric keypad. Current stimulus values for the active channel are also displayed along the bottom of the graticule. Frequency values can be blanked for security purposes, using the display menus.

The preset stimulus mode is frequency, and the start and stop stimulus values are set to

30 kHz and 3 GHz (or 6 GHz with Option 006) respectively. In the time domain (Option 010) or in CW time mode, the stimulus keys refer to time (with certain exceptions). In power sweep, the stimulus value is in dBm. Because the primary channels are independent, their stimulus signals can be uncoupled and their values set independently. The values are then displayed separately if the instrument is in multiple channel display mode. In the uncoupled mode with dual channel display the instrument takes alternate sweeps to measure the two sets of data. Channel stimulus coupling is explained in the “Stimulus Menu” section, and dual channel display capabilities are explained in the “Display Menu” section located later in this chapter.

6-12 Application and Operation Concepts

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HP 8753E manual Stimulus Functions, Defining Ranges with Stimulus Keys