Datasheet

9.4. Delta
Delta is one of marker type, used to measure the difference between “reference marker” and “certain
point on trace”: X value (frequency or time) and Y value (amplitude). When this type selected, a pair
of markers will appear on trace, Reference Marker (indicated with number and letter “R”, like “1R”)
and Delta Marker (indicated with number, like “1”).
Key points:
 If there is active marker, pressing this key will enalble a reference marker at the place of current
marker. Or else both the reference marker and Delta Marker will be activated together at the
position of center frequency.
 The position of Reference Marker is always fixed (X and Y), but the Delta Marker can be shifted
by numeric keys, knob and arrow keys if it is active.
 The differences of frequency (or time) and amplitude between two markers are shown at the
upper right of screen.
 The methods of making one point as reference:
a) Open a Normal Marker and place it on one point. Then switch the marker type to Delta and
this point becomes reference by changing the position.
b) Open a Delta Marker and place it on one point. Then select Delta menu again, so that
Reference Marker is located on this point and be available to measure the delta by changing
the position.
 Enable “Noise Marker” function under Marker Fctn menu, then the result of noise measurement
will be more accurate by auto correction and be normalized to 1Hz.
The application of Delta Marker: to measure the signal-noise ratio of single
spectrum signal. For example, place the Reference Marker at the position of
signal and Delta Marker at the position of Noise, the measuring amplitude is the
signal-noise ratio.
9.5. Delta Pair
Delta Pair is one of marker types. When selected, a pair of markers will appear on trace, which are
Reference Marker (indicated with number and letter “R”, like “1R”) and Delta Marker (indicated with
number and letter “D”, like “1D”).
Key points:
 You can adjust the position of reference marker (select “reference”) and Delta Marker by
numeric keys, knob and arrow keys.
 The difference between Delta Pair and Dalta: you just can modify the delta point in Delta type,
but you can modifiy both delta point (select Delta option) and reference point (select
“Reference” option) in Delta Pair type. Additioally, X and Y keeps unchanged during sweep in
Delta type, but the Y-axis change along with sweep while X-axis keeps unchanged in Delta Pair
type.
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