64 34410A/11A/L4411A User’s Guide
2 Features and Functions
dB Measurements
Applies to ac voltage and dc voltage measurements only.
Each dB measurement is the difference between the input signal and a stored relative
value, with both values converted to dBm.
dB = reading in dBm – relative value in dBm
• The relative value can take any value between 0 dBm and ± 200.0 dBm. The default
relative value is 0 dBm. You can either let the instrument automatically measure this
value, or you can enter a specified value.
• Front Panel Operation: Press
MATH > dB > dB RELATIVE
Select MEASURE or VALUE.
• Select MEASURE if you want the instrument to set the relative value
automatically by measurement. The Math annunciator will light and the reading
will be displayed in dB.
If the configured settings will result in a long measurement time or have the
multimeter waiting for an external trigger, the Math annunciator will flash until
the relative value measurement is taken.
• Select VALUE if you want to enter a specific relative value. Use the navigation
keypad to set the desired dB REL VALUE. The Math annunciator will light and
the reading will be displayed in dB.
You can also select VALUE to view a previously set or measured value.
• Remote Interface Operation: The following command sequence selects the dB
function, turns the function on, and sets a relative value.
CALCulate:FUNCtion DB
CALCulate:STATe ON
CALCulate:DB:REFerence <
value
>
Refer to the Keysight 34410A/11A/L4411A Programmer’s Reference Help for
a complete description and syntax for these commands.
dBm Measurements
Applies to ac voltage and dc voltage measurements only.
The dBm function is logarithmic, and is based on a calculation of power delivered to a
reference resistance, relative to 1 milliwatt.
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