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HP 8590 E & L Series Spectrum Analyzers and HP 8591C Cable TV ...

HP 8590 E & L Series Spectrum Analyzers and HP 8591C Cable TV ...

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TM<br />

Trigger Mode<br />

Selects a trigger mode: free, line, video, <strong>TV</strong>, or external.<br />

Syntax<br />

Equivalent Softkeys: The keys accessed by L‘TRIG).<br />

Related Comm<strong>and</strong>s: DL.<br />

Example<br />

OUTPUT 718;"TM EXT;" Activates the extol trigger mode.<br />

Description<br />

The conditions of the four trigger modes are as follows:<br />

FREE<br />

VID<br />

LINE<br />

EXT<br />

<strong>TV</strong><br />

allows the next sweep to start as soon as possible after the last sweep. The functions<br />

of TM FREE <strong>and</strong> FIZZ RUN are identical.<br />

allows the next sweep to start if the trace data rises across a level set by the display<br />

line. The functions of TM VID <strong>and</strong> BIDED are identical.<br />

allows the next sweep to start when the line voltage passes through zero, going<br />

positive. The functions of TM LINE <strong>and</strong> LIYE are identical.<br />

allows the next sweep to start when an external voltage level passes through<br />

approximately 1.5 V, going positive. The external trigger signal level must be between<br />

0 V <strong>and</strong> + 5 V. Connect the external trigger to the EXT TRIG INPUT. The functions of<br />

TM EXT <strong>and</strong> l%l’ERl?AL are identical.<br />

allows <strong>TV</strong> triggering if Options 101 <strong>and</strong> 102, or Option 301 is installed. The functions<br />

of TM <strong>TV</strong> <strong>and</strong> <strong>TV</strong> TftIG are similar. TM <strong>TV</strong> does not select the <strong>TV</strong> line number, set up<br />

the amplitude level, change the span, change the b<strong>and</strong>width, or change the sweep<br />

time.<br />

Note Some spectrum analyzer functions are not performed until the spectrum<br />

analyzer is triggered.<br />

5-554 Programming Comm<strong>and</strong>s<br />

XTM

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