Dedicated Controls
2715 User Manual
4–27
marker mode is turned off, the spot on the display indicates either the center or
starting frequency of the display. When a single marker is turned on, it can be
moved to any point along the displayed waveform using the FREQ/MKRS knob.
The corresponding signal amplitude and frequency are displayed on screen. The
marker amplitude readout represents the most accurate method for determining
signal amplitude with the 2715 (unless a separate, extremely precise signal is
used for direct comparison). In general, amplitude accuracy is further enhanced if
the signal being measured is first moved to within one division of the top
graticule line using the REF LEVEL controls.
In delta (
D
) marker mode, two markers designate the points on the waveform
between which the differences in signal amplitudes and frequencies are measured
and displayed. It is not possible to display one marker on a particular trace while
displaying the second marker on another trace. More than one register can be
displayed, but the markers appear only on the highest priority waveform.
1. Press [MKR/
/OFF] to activate the marker.
The sweep does not change, but the RF attenuation and video filter readouts
have been replaced by approximate marker frequency and amplitude readouts
such as the following:
M 100.0MHZ
M 18.8DBMV
The M preceding the readouts represent the amplitude and frequency of the
signal at the marker position.
2. Turn the FREQ/MKRS knob several clicks clockwise.
The marker moves to the right and the readout tracks it. The knob now
controls the marker position rather than the center frequency.
3. Turn the FREQ/MKRS knob to move the marker into the noise.
Notice that the marker actually moves up and down between the max and
min noise values on alternate clicks of the knob. This is because each click
of the knob moves the marker to the next bit in the digital waveform
memory, thus tracking the stored max and min values.
4. Turn the FREQ/MKRS knob counterclockwise and the marker moves left.
Again, the readout tracks the signal amplitude and frequency at the marker
position.
Be aware that the marker frequency accuracy is not as good as the center
frequency accuracy because it includes a span nonlinearity component (see
CTR-MEAS/TRKG on page 4–29 for a discussion of frequency measurement
accuracies).
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Страница 25: ...Getting Started ...
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Страница 47: ...Operating Basics ...
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Страница 71: ...Dedicated Controls ...
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Страница 109: ...CATV Measurements ...
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Страница 181: ...Spectrum Analyzer Menus ...
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Страница 275: ...Appendices ...
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Страница 302: ...Appendix B Broadcast AM FM and TV Signal Sources B 2 2715 User Manual ...
Страница 318: ...Appendix C System Messages C 16 2715 User Manual ...
Страница 334: ...Appendix E External Input and Output E 12 2715 User Manual ...
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