SIGLENT SDM3045X - Example 4: Db Measurement

SIGLENT
84 SDM3045X Digital Multimeter
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. The following will introduce you how to measure dB
between two circuits.
Operating Steps:
Method 1:
Measure dBm
1
and dBm
2
existing in two circuits separately according to
Example 3, and then dB could be got:.
dB = dBm
1
-dBm
2
Method 2:
1. Press on the front panel to select AC Voltage measurement
function and choose a proper voltage range.
2. Connect the red lead to terminal Input-HI and black lead to terminal
Input-LO as Diagram 2-9.
3. Measure dBm
1
according to Example 3.
4. Press →【 dB/dBm】to turn on the dB function and Set parameters
of dB Ref Value (dBm
2
). At this time, the reading shown on the screen is
the power difference between two circuits.
Diagram 3- 7 Set the Parameters of dB Ref Value