How are the various quantities measured?
38
6,000- and 60,000-count digital multimeters
How are the various quantities measured? (continued)
11. dBm decibels in
power
(MTX3291,
only)
1. Press:
.
2. Press
again
.
3. Press
to select the reference resistance, 50, 75, 90, or 600 Ohm.
4. Connect the black lead to the “COM” terminal and the red lead to “V”.
5. Place the test probes on the terminals of the circuit to be measured.
*
Connect the instrument as for a voltage measurement.
6. Read the measurement value indicated on the display unit:
- the main display unit indicates the value in dBm
- the secondary display unit indicates the resistance measured on the
installation(50
Ω
, by default).
Reminder
R
0dBm (VRef) en
50
Ω
223.6mV
75
Ω
273.86mV
90
Ω
300mV
600
Ω
774.6mV
XdBm =
Vmeasured
20 Log
VRef
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