HP ESA-E Series Programmer's Manual page 168

Language Reference
CALCulate Subsystem
Define Limit Line Values
:CALCulate:LLINe[1]|2:DATA
<x-axis>,<ampl>,<connected>{,<x-axis>,<ampl>,<connected>}
:CALCulate:LLINe[1]|2:DATA?
Defines limit line values, and destroys all existing data. Up to 200
points may be defined for each limit. No units are allowed.
• <x-axis> – can be frequency or time values as specified by
:CALCulate:LLINe:CONTrol:DOMain. Frequencies are always in
Hz. Time is always in seconds. No unit is allowed in this parameter.
• <ampl> – amplitude values are always in units of dBm. Up to two
amplitude values can be provided for each x-axis value, by repeating
<x-axis> in the data list. No unit is allowed in this parameter.
• <connected> – connected values are either 0 or 1. A 1 means this
point should be connected to the previously defined point to define
the limit line. A 0 means that it is a point of discontinuity and is not
connected to the preceding point. The "connected" value is ignored
for the first point.
Example:
CALC:LLIN1:DATA
1000000000,–20,0,200000000,–30,1
Range: <x-axis> –30 Gs to +30 Gs for time limits
<fx-axis> –30 GHz to +30 GHz for frequency limits
<ampl> –120 dBm to +100 dBm
<connected> 0 or 1
Remarks: If two amplitude values are entered for the same
frequency, a single virtical line is the result. In this
case, if an upper line is chosen, the amplitude of lesser
frequency (amplitude 1) is tested. If a lower line is
chosen, the amplitude of greater frequency (amplitude
2) is tested.
For linear amplitude interpolation and linear frequency
interpolation, the interpolation is computed as:
For linear amplitude interpolation and log frequency
interpolation, the interpolation is computed as:
y =
5-14
y – y
i + 1 i (
y = --------------------- - f f –
f – f
i + 1 i
y – y
i + 1 i
(
-------------------------------------- - log f log f
log f – log f
i + 1 i
)
+ y
i i
)
– + y
i i
Chapter 5