RIGOL DM3068 - Manual (Page 96)

RIGOL Chapter 2 Front Panel Operations
User’s Guide for DM3068 2-54
dBm
dBm represents the absolute value of the power. The dBm operation calculates the
power of the reference resistance according to the measured voltage.
dBm = 10 x Log
10
[ (Reading 2 / R
REF
) / 1 mW ]
Wherein, Reading denotes the measured voltage and R
REF
denotes the reference
resistance.
Press dBm to enter the following interface, from which you can use the direction
keys to specify a reference resistance within 2 Ω and 8000 Ω. The setting is stored
in volatile memory and will be cleared automatically at power-off.
Default: restore the reference resistance to 600 Ω.
On: enable dBm operation. The multimeter then automatically goes to the
measurement main interface, as shown in the figure below.
 The status bar displays “dBm”.
 The dBm operation result is displayed at the center of the screen.
 The current measurement reading and the reference resistance are displayed
at the lower left corner and lower right corner of the screen respectively.