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

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HNLOCK Harmonic Number Lock<br />

Once HNLOCK is set, only frequencies <strong>and</strong> spans that fall within the frequency b<strong>and</strong> of the<br />

current harmonic may be entered. The span is reduced automatically to accommodate a center<br />

frequency specified near the end of the b<strong>and</strong> range.<br />

Note Before changing the frequency range to another harmonic, unlock the b<strong>and</strong><br />

with the harmonic unlock comm<strong>and</strong>, “HNLOCK OFF;” or “HNUNLK; “.<br />

BAND LOCK ON (HNLOCK ON)<br />

Start Frequency<br />

If a start frequency is entered that is outside of the current b<strong>and</strong> boundaries, it will be set<br />

to the nearest b<strong>and</strong> edge instead. If a start frequency that is greater than the current stop<br />

frequency is entered, the (possibly modified) start frequency is used for both the start <strong>and</strong> the<br />

stop frequency; therefore, the span will be set to zero. If the start <strong>and</strong> stop frequencies specify<br />

too large a span, they will be modified. (Also see “FA.“)<br />

Stop Frequency<br />

If a stop frequency is entered that is outside of the current b<strong>and</strong> boundaries, it will be set to<br />

the nearest b<strong>and</strong> edge instead. If a stop frequency that is less than the current start frequency<br />

is entered, the (possibly modified) stop frequency will be used for both the start <strong>and</strong> stop<br />

frequency; therefore, the span will be set to zero. (Also see “FB.“)<br />

Center Frequency<br />

The span will be modified if necessary to get the center frequency specified without crossing<br />

the b<strong>and</strong> edges. (Also see “CF.“)<br />

Span<br />

The span will be limited as necessary to keep the start <strong>and</strong> stop frequencies within the b<strong>and</strong><br />

edges without changing the center frequency. The maximum span allowed is 2.943 GHz in b<strong>and</strong><br />

0, 3.600 GHz in b<strong>and</strong> 1, 6.957 GHz in b<strong>and</strong> 2, <strong>and</strong> 7 GHz in higher b<strong>and</strong>s. (Also see “SP.“)<br />

BAND LOCK OFF (HNLOCK OFF)<br />

The start <strong>and</strong> stop frequencies are bounded by the range of the instrument.<br />

The frequency not specified will be bounded by the following scheme:<br />

Continuous Sweep Mode: If the specified frequency is in b<strong>and</strong> 0, the values will be contained<br />

by the bounds of b<strong>and</strong> 0. If the value is in the harmonic b<strong>and</strong> range, the values will<br />

be bounded by the top of the instrument range <strong>and</strong> the lower end of b<strong>and</strong> 1. (Also see<br />

“CONTS. “)<br />

Single Sweep Mode: The values are bounded by the instrument range only; therefore, b<strong>and</strong> 0<br />

can be included in a multib<strong>and</strong> sweep in single mode. (Also see “SNGLS.“)<br />

Programming Comm<strong>and</strong>s 5-231

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