HP Cable Box 8591C User Manual

Making Measurements Using Spectrum Analyzer Mode

4. To check the gate control function, press 

 Gate Control ,

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

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I

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When the GATE CTL EDGE LVL 

 function is set to edge, triggering

occurs at the edge of the trigger input. When the GATE CTL EDGE LVL

 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

 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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