Measuring spectral features using a cursor and a marker

Details Measuring spectral features using a cursor and a marker Measuring spectral features using a cursor and a marker

1989-12-26

1992-06-02

Weldon, Ulysses

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

340722, 324 77B, 324 77R, G09G 302, G09G 106

Patent

active

051190761

ABSTRACT:
An improved marker and cursor system for spectral waveform measurement permits the operator to link or unlink a cursor and a marker, allowing them to be used separately or in coordination to make bandwidth measurements. A second reference marker permits measurement of the frequency and amplitude differneces between it and the marker at the same time that the marker is being used control the linked cursor. The cursor can be fixed or linked in a constant positive or negative delta-amplitude relationship to the marker. The points on the cursor where the cursor and spectral waveform intersect are intensified for identification and a readout is provided of the difference in frequency values between these points. Measurements continue even during unstable conditions of the instrument or spectral waveform and fluctuations show up as only minor movements of the intensified points along the cursor. If there is no intersection of the cursor and spectral waveform in one direction, the absolute frequency value of the other intersection is displayed instead of a delta-frequency value.

REFERENCES:
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patent: 4890099 (1989-12-01), Takano
Tektronix, Inc., 2782 Spectrum Analyzer Operator's Manual (P/N 070-6794-00), 1989, pp. 4-9 tp 4-15.
Advantest Corp., R3261/3361 Series Spectrum Analyzer Instruction Manual, 1988, pp. 4-33 and 4-31 to 4-42.
Hewlett-Packard, HP 8593A/8593A Spectrum Analyzer, Jun. 1989, pp. 6-12 to 6-15, 7-9, 7-26, and 7-29 to 7-33.
Tektronix, 2710 Spectrum Analyzer Operator's Manual and User's Guide, 1989, pp. 3-4, 3-5, 4-20, 4-21 and 3-25 to 3-33 and 4-59 to 4-60.
Tektronix 2755/2755P, 2755A/2755AP Spectrum Analyzer Operator's Manual, 1986, pp. 4-7 to 4-9.
Tektronix, 495/495P Spectrum Analyzer Programmer's Manual, Oct. 1987, pp. 5-10 and 5-11.

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