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Text excerpt from page 189 (click to view)
To change the value of a limit variable
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Use the MOV command to move the new value for a limit into the variable for the limit. 05
w Use the VARDEF command to move the new value for a limit into the variable for the limit. The CTB-CA1 measurements personality uses a �limit� to decide if the measurement results failed or passed. For example, if a signal is above the intermodulation attenuation limit, the unit under test will fail the intermodulation attenuation measurement. You can change a limit by changing the value of the limit variable. See �Ihble 5-2 in Chapter 5 for a list of all the limit variables. There are two ways to move a value to a limit variable: with the MOV command or with the VARDEF command.
lf you use the MOV command:
The limit variable will be reset to the default value for the limit variable if an instrument preset (IP) is executed or the spectrum analyzer is turned off. Example of the MOV command OUTPUT 718; �MOV -IMDX, -50; " Changes the limit for intermodulation products from the default value of -54 dBm to -50 dBm.
If you use VARDEF command: The value for the limit variable is retained by the limit variable even if an instrument preset (IP) is executed or the spectrum analyzer is turned off. Example for the VARDEF command
OUTPUT 718;"VARDEF -IMDX,-50;"
Changes the limit for intermodulation products from the default value of -54 dBm to -50 dBm.
The VARDEF command changes the CTB-CA1 measurements personality that is currently in spectrum analyzer memory; the VARDEF command does not change the program on the HP 85717A memory card. If you reload the CTB-CA1 measurements personality from the HP 85717A memory card, all the limit variables are set to their default values.
