dB/dBm
The dB and dBm scaling functions only apply to ACV and DCV measurements. The
functions allow you to scale measurements relative to a reference value.
Press the front panel key, press the dB/dBm softkey to access the menu.
Press the dB/dBm softkey to enable or disable the function.
Press the dB/dBm softkey to
dBm Function
dBm function represents the absolute value of the power. The function calculates the
power of the reference resistance according to the measured voltage, relative to 1 mW:
dBm = 10 x log
10
( reading
2
/ reference resistance / 1 mW )
Press the Ref R softkey to select the reference resistance. The value may be 50, 75, 93,
110, 124, 125, 135, 150, 250, 300, 500, 600 (default), 800, 900, 1000, 1200, or 8000 Ω.
dB Function
dB represents the relative value which is used in the relative operation of dBm value.
When enabled, the multimeter calculates the dBm value of the reading and subtracts the
preset dB from this value and then displays the result:
dB = 10 x Log
10
( reading
2
/ reference resistance / 1 mW) - dB preset
Press the Ref R softkey to select the reference resistance. The value may be 50, 75, 93,
110, 124, 125, 135, 150, 250, 300, 500, 600 (default), 800, 900, 1000, 1200, or 8000 Ω.
Press the dB Ref Value softkey to select the relative value. The relative value must be
from -120 to +120 dBm (default 0).
Relative Value
When the relative operation is turned on, the reading displayed on the screen in relative
operation is the difference between measured and preset values. The value is specific to
the present function and will persist even if you leave this function and return to it later.
Reading = Measured value – Preset value
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