Instructions

Chapter 2 Functions of the Front Panel of GPSA RIGOL
RSA3000E User Guide 2-11
Atten Auto
Selects "Manual" or "Auto" to be the current attenuation mode.
Remarks:
 To select "Manual" to be the attenuation mode, press Attenuation to set the
attenuation value, and the attenuation mode will be automatically switched to
"Manual".
 When you select "Auto" to be the attenuation mode, the attenuator will
automatically adjust the attenuation value to meet the current amplitude
setting.
RF Preamp
Sets the RF front-end 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, dBuV, Volts, or Watts. Wherein, dBm, dBmV,
and dBuV are for Log scale; Volts and Watts are for Linear scale. The default unit is
dBm.
Remarks:
The conversion relations between units are as follows:










×=
0.001W
1
R
2
Volts
10lgdBm
(2-4)








=
V1
Volts
20lgVdB
µ
µ
(2-5)








=
1mV
Volts
20lgdBmV
(2-6)
R
2
Volts
Watts =
(2-7)
Wherein,
R
denotes the reference resistance.