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

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Description<br />

AMBPL Trace A Minus Trace B Plus Display Line<br />

The AMBPL comm<strong>and</strong> subtracts trace B from trace A (point by point), adds the display line<br />

value to the difference, <strong>and</strong> sends the result to trace A. The AMBPL function remains in effect<br />

until it is turned off by executing “AMBPL OFF;“.<br />

A common use of trace subtraction is to normalize one trace with respect to another. For<br />

example, traces are frequently subtracted to normalize the spectrum analyzer response when a<br />

tracking generator is used. In such applications, amplitude units in dBm should be subtracted.<br />

To accomplish this, the display line should be set to 0 dBm using DL as shown in the example.<br />

To compare how you would use the AMB comm<strong>and</strong> to do the same operation, see examples 2<br />

<strong>and</strong> 3 for the AMB comm<strong>and</strong>.<br />

Query Response<br />

ON<br />

OFF<br />

002<br />

Programming Comm<strong>and</strong>s 5-61

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