HP 8590 E & L Series Spectrum Analyzers and HP 8591C Cable TV ...

Example
IF TEEN ELSE ENDIF If Then Else Endif
The following example uses the IF/THEN/ELSE/ENDIF command to pick a center frequency.
10 OUTPUT 718; “IP; ”
20 OUTPUT 718;“TH -35DM;”
30 OUTPUT 718;“TS;MKPK HI;MA;”
40 OUTPUT 718;“IF MA,GT,TH THEN;”
50 OUTPUT 7 18 ; “CF 20MHZ ; ”
60 OUTPUT 718; “ELSE; ”
70 OUTPUT 718;“CF 100MHZ;TS;MKPK HI;”
80 OUTPUT 718; “ENDIF; ”
90 END
Initializes spectrum analyzxx
Sets threshold level.
Finds highest peak.
Compares peak to threshold.
Changes center frequency to 20 MHz if peak
amplitude is greater than the threshold.
This line is executed if peak is less than or
equal to the threshold level.
End of IF/THEN/EUE/ENDIF
The example below does not include the ELSE portion of the IF/THEN/ELSE/ENDIF command.
This example lowers any signal positioned above the spectrum analyzer screen.
10 OUTPUT 718; “IP; ” Initializes spectrum analyzer
20 OUTPUT 718 ; “SNGLS ; TS ; MKPK HI ; MA ; ‘I Finds peak of trace.
30 OUTPUT 718;“IF MA,GT,RL THEN;” Compares peak amplitude and reference level.
40 OUTPUT 7 18 ; “MKRL ; ” rt?rfrms line 40 if the marker amplitude is
50 OUTPUT 718; “ENDIF; ”
60 END
Description
greater than the reference level.
Ends IF/THEN/EN/ENDIF structure.
The IF portion compares operands 1 and 2 with the operators shown in the following table.
Operator Description
GT
LT
EQ
NE
GE
LE
Greater than.
Less than.
Equal to.
Not equal to.
Greater than or equal to.
Less than or equal to.
If the condition is true, the command list following the IF statement is executed and commands
between ELSE and ENDIF are skipped. If the condition is false, the commands after the ELSE
statement are executed. If there is no ELSE statement, program execution resumes after the
ENDIF statement.
Programming Commands 5-237