Rigol RSA3000E Series - Page 241

Chapter 4 Functions of the Front Panel of EMI RIGOL
RSA3000E User Guide 4-7
Table 4-7 Att(Meter)
Parameter
Remarks
Default
0 dB
Range
0 dB to 50 dB
Unit
dB
Knob Step
preamp off, step = 1 dB
Left/Right Arrow Key Step
Up/Down Arrow Key Step
5 dB
RF Preamp(Meter)
Sets the meter preamplifier to be on or off. When the signal under test is a low-level
signal, turning on the preamplifier can reduce the displayed average noise level, so
that you can distinguish low-level signals from the noise. By default, the preamp gain
is 20 dB.
Y Axis Unit
Sets the unit of the Y-axis to dBm, dBmV, dBμV, Volts, or Watts. Wherein, dBm, dBmV,
and dBμV are for Log scale; Volts and Watts are for Linear scale. The default unit is
dBuV.
Remarks:
The conversion relations between units are as follows:










×=
0.001W
1
R
2
Volts
10lgdBm
(4-3)








=
V1
Volts
20lgVdB
µ
µ
(4-4)








=
1mV
Volts
20lgdBmV
(4-5)
R
2
Volts
Watts =
(4-6)
Wherein,
R
denotes the reference resistance.