Agilent Technologies E4445A User Manual

168 Chapter 3
Instrument Functions: M - O
Marker
Instrument Functions: M - O
Marker Units
• Normal markers - the display shows the value of the Y-axis position of the marker in the
current Y-axis units. (See
Amplitude, Y Axis Units.)
• Delta, Delta Pair, or Span Pair markers - the display shows the ratio (difference when
expressed in dB) between two markers. If the Y-axis units are logarithmic (dBm, dBmV,
dBuV) the ratio is express in dB. If the Y-axis units are linear (volts, watts) the ratio is
expressed in percent (where 100% is the same as 0 dB difference). Note that the value
when the Y-axis units are watts is the square of the value when the Y-axis units are
volts. For example, when the percent ratio with Y-axis units in volts is 20% (0.2), the
percent ratio with Y-axis units in watts will be 4% (0.2
2
= 0.04). When you read the
value out remotely you have to know whether you are in log (dB) or linear (percent).
• Marker functions (Marker Noise and Band/Intvl Power) - the display shows the values
with units that are dependent on the function and the Y-axis units. Refer to the
individual function descriptions for more details about the units used. When you read
the value out remotely you have to know what the expected units are.
Remote Command:
:CALCulate:MARKer[1]|2|3|4:MODE POSition|DELTa|BAND|SPAN|OFF
:CALCulate:MARKer[1]|2|3|4:MODE?
Sets or queries the marker control mode (see parameter list above).
:CALCulate:MARKer[1]|2|3|4:X <param>
Sets the marker X position to a specified point on the X axis in the current X-axis units
(frequency or time). If the frequency or time chosen would place the marker off screen, the
marker will be placed at the left or right side of the display, on the trace. This command
will have no effect if the marker is
OFF.
:CALCulate:MARKer[1]|2|3|4:X?
Queries the marker X position in the current x-axis units. The marker must be
ON for the
response to be valid.
[:SENSe]:MARKer[1]|2|3|4:X:POSition <param>
Sets the marker X position to a specified point on the X axis in display points (values of 0 to
600, or the current number of points in the sweep). The marker must already be on.
[:SENSe]:MARKer[1]|2|3|4:X:POSition?
Returns the current marker X position in display points.
:CALCulate:MARKer[1]|2|3|4:Y?
Queries the marker Y value or delta in the current y axis units. Can also be used to read
the results of marker functions such as
Marker Noise. The marker must be ON for the
response to be valid.

Agilent Technologies E4445A Specifications

General

Brand	Agilent Technologies
Model	E4445A
Category	Measuring Instruments
Language	English