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ManualsBrandsRIGOL ManualsLaboratory Test EquipmentDSA815Spectrum analyzer, spectrum analyzerBandwidth (RBW) 100 Hz - 1 MHz
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User’s Guide for DSA800 Series
Chapter 2 Front Panel Operation RIGOL
2-79
The readout resolution of the X-axis (frequency or time) is related to the span.
For higher readout resolution, reduce the span.
Delta
One of the marker types. It is used to measure the delta values of X (Frequency or
Time) and Y (Amplitude) between the reference point and a certain point on the
trace. When selected, a pair of markers appears on the trace: Reference Marker
(marked by a combination of the marker number and letter “R”, such as “1R”) and
the Delta Marker (marked by the marker number, such as “1”).
Key Points:
The reference marker will be activated at the position of the current marker if
an active marker currently exists, or else both the reference marker and delta
marker will be simultaneously activated at the center frequency.
The location of the reference marker is always fixed (both on the X-axis and
the Y-axis), while the Delta Marker is active. You can use the numeric keys,
knob or direction keys to change the location of the Delta Marker.
The delta of both the frequency (or time) and amplitude between the two
markers are displayed at the upper right corner of the screen.
There are two methods for defining a point as the reference point:
a) Open a “Normal” marker and locate it onto a point and then switch the
marker type to “Delta”. Then, you can modify the location of the delta
point to achieve delta measurement.
b) Open a “Delta” marker and locate it onto a point, then reselect the Delta
menu to locate the reference marker onto this point. Then, you can
modify the location of the delta point to achieve delta measurement.
When the Noise Mkr function under the Marker Fctn menu is activated, the
result of the noise measurement will be corrected automatically and be
normalized to 1 Hz.
The application of “Delta” marker
Measure the signal-noise ratio of single spectrum signal:
separately place the reference and delta Markers onto the signal and noise, the
amplitude in the measurement result is the signal-noise ratio.