HP Cable Box 8591C manual Using the level Gate Control

Making Measurements Using Spectrum Analyzer Mode

Using the Time-Gated Spectrum Analyzer Capability Without the Gate Utility (Option 107 only)

4.To check the gate control function, press Cm], Gate Control ,

GATE CTL EDGE LVL so that LVL (level) is underlined. (See Figure 5-31.)

dB/

I I I I I I I ! ! IEDGE POL

SPAN 0 HZ

RES BW 3 0 MHZ “BW 1 MHZ #SWP 200 msec

Figure 5-31. Using the level Gate Control

When the GATE CTL EDGE LVL softkey function is set to edge, triggering

occurs at the edge of the trigger input. When the GATE CTL EDGE LVL softkey function is set to level, the gate is on whenever the trigger input is high. Because the trigger input for this example is the HI SWEEP IN/OUT signal, and HI SWEEP IN/OUT signal is high (+ 5 V) during every sweep, the level of the signal on screen is high.

Notice that the GATE DELAY , GATE TIME, and EDGE POL MEG POS softkeys are blanked when the gate control is set to level. When the gate control is set to level (LVL), the functions of gate delay, gate length, and edge trigger polarity no longer apply.

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