RIGOL DM3058 - Manual (Page 103)

RIGOL
User’s Guide for DM3058/DM3058E 3-5
Example 4: dB Measurement
As a common measuring unit, dB has been widely used in electrical engineering,
radio science, mechanics, shock and vibration, mechanical power and acoustics
areas. Next, we will show you how to measure dB between two circuits.
Operating Steps:
Method1:
Measure dBm
1
and dBm
2
existing in two circuits separately refers to Example 3, and
then dB could be got:
dB = dBm
1
-dBm
2
Method2:
1. Press
button to start AC Voltage Measurement and choose an appropriate
voltage range.
2. Connect test leads as Figure 2-8.
3. Set up dBm
2
according to Example 3.
4. Press  dB, set parameters of dB operation (dBm
1
).
Figure 3-7 Set the set value of dB
5. Press
 ON to open dB measurement function. At this time, the reading
shown on the screen is the Power difference between two circuits.
Figure 3-8 Operation result