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

LOG Logarithm
Prerequisite Commands: TRDEF when using a user-defined trace. ACTDEF or VARDEF when
using a user-defined variable. TS when using trace data.
Related Commands: EXP.
Example 1
OUTPUT 718~"IP~"
OUTPUT 718;"VAIiDEF P,OWER,O;"
Initializes spectrum analyzer
Dt$nes a user-de$ned variable, called P-OWE& and sets
it equal to 0.
OUTPUT 718;"LOG P,OWER,S,lO;" P-OWER = 10x LOG(5)
OUTPUT 718;"P,OWER?;" Returns value to computer:
ENTER 718;N Assigns value to computer variable.
DISP USING "D.DD,K";N;" dB" Displays value on the computer screen.
Example 2
This example finds the natural exponential of a number and uses the LOG function to return
the original source value of the EXP function.
10 OUTPUT 718;"VARDEF E-XP,O;"
20 OUTPUT 718;"EXP E,XP,2,2.30259;"
30 OUTPUT 718;"E_XP?;"
40 ENTER 718;Value
50 PRINT Value
60 OUTPUT 718;"LOG EmXP,E-XP,2.30259;"
70 OUTPUT 718*"E XP'."
, - *,
80 ENTER 718;Logvalue
90 PRINT Logvalue
100 OUTPUT 718;"VARDEF E-XPY,O;"
110 OUTPUT 718;"EXP E,XPY,-5,2.30259;"
120 OUTPUT 718;"E_XPY?;"
130 ENTER 718;Value2
140 PRINT Value2
150 OUTPUT 718;"LOG E-XPY,E-XPY,2.30259;"
160 OUTPUT 718;"E,XPY?;"
170 ENTER 718;Logval
180 PRINT Logval
190 END
Dt$lnes a variable called E-XI!
Fino!s the natural exponential of 2.
Returns the natural exponential of 2.
I?+& the value of the exponential.
Uses the log function on the exponential
value.
The log of the exponential value is approximately
2.
Declares a variable called E-XPk:
Finds the natural exponential of -5.
Returns the value of the natural exponential
of -5.
FVints the value of the exponential.
Uses the log fan&ion on the exponential
value.
The log of the exponential value is approximately
-5.
Programming Commands 5-299