To Make Dbm Measurements - HP 34401A User Manual

Chapter 2 Front-Panel Menu Operation

To Make dBm Measurements

To Make dBm Measurements
The dBm operation calculates the power delivered to a resistance
referenced to 1 milliwatt.
dBm = 10 Log ( reading
10
Enables dBm operation;
Press again to disable.
Select or
DC V AC V
The factory setting for the reference resistance is 600 . To select a
different value, press
operations. This takes you to the "
(only if dBm is enabled).
MATH MENU
Go down to the "parameter" level, and then select a value: 50, 75,
93, 110, 124, 125, 135, 150, 250, 300, 500, 600, 800, 900, 1000,
1200, or 8000 ohms.
The reference resistance is stored in non-volatile memory, and does not
change when power has been off or after a remote interface reset.
2
/
reference resistance
To read / edit the dBm reference resistance,
use the MATH menu.
.
(Menu Recall) after enabling dBm
Shift >
" command in the
dBm REF R
/
1 mW )
Math annunciator is on when
dBm operation is enabled.
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