Operating instructions

CALCulate:LIMit Subsystem R&S ESCI
1166.6004.12 6.18 E-1
CALCulate:LIMit Subsystem
The CALCulate:LIMit subsystem consists of the limit lines and the corresponding limit checks. In
receiver mode, upper limit lines can be defined. In analyzer mode, limit lines can be defined as upper or
lower limit lines. The individual Y values of the limit lines correspond to the values of the X axis
(CONTrol). The number of X and Y values must be identical.
8 limit lines can be active at the same time (marked by LIMIT1 to LIMIT8) in screen A and/or screen B.
The measurement windows is selected via CALCulate 1 (screen A) or 2 (screen B).
The limit check can be switched on separately for each measurement screen and limit line. WINDow1
corresponds to screen A, WINDow2 to screen B.
Each limit line can be assigned a name (max. 8 letters) under which the line is stored in the instrument.
An explanatory comment can also be given for each line (max. 40 characters).
Example (analyzer mode):
Definition and use of a new limit line 5 for trace 2 in screen A and trace 1 in screen B with the following
features:
• upper limit line
• absolute X axis in the frequency domain
• 5 ref. values: 126 MHz/-40 dB, 127 MHz/-40 dB, 128 MHz/-20 dB, 129 MHz/-40 dB,
130 MHz/-40 dB
• relative Y axis with unit dB
• absolute threshold value at -35 dBm
• no safety margin
Definition of the line:
1. Defining the name: CALC:LIM5:NAME 'TEST1'
2. Entering the comment: CALC:LIM5:COMM 'Upper limit line'
3. Associated trace in screen A: CALC1:LIM5:TRAC 2
4. Associated trace in screen B: CALC2:LIM5:TRAC 1
5. Defining the X axis range: CALC:LIM5:CONT:DOM FREQ
6. Defining the X axis scaling: CALC:LIM5:CONT:MODE ABS
7. Defining the Y axis unit: CALC:LIM5:UNIT DB
8. Defining the Y axis scaling: CALC:LIM5:UPP:MODE REL
9. Defining the X axis values: CALC:LIM5:CONT 126MHZ, 127MHZ, 128MHZ,
129 MHZ, 130MHZ
10. Defining the y values: CALC:LIM5:UPP -40, -40, -30, -40, -40
11. Defining the y threshold value: CALC:LIM5:UPP:THR -35DBM
The definition of the safety margin and shifting in X and/or Y direction can take place as from here (see
commands below).
Switching on and evaluating the line in screen A:
1. Switching on the line in screen A: CALC1:LIM5:UPP:STAT ON
2. Switching on the limit check in screen A: CALC1:LIM5:STAT ON
3. Starting a new measurement with synchronization: INIT;*WAI
4. Querying the limit check result: CALC1:LIM5:FAIL?
Switching on and evaluating the line in screen B is performed in the same way by using CALC2
instead of CALC1.