Tektronix WCA200A, User Manual

Page: 255 / 454

Setting Amplitude
WCA230A & WCA280A User Manual
3- 129
RF Atten/Mixer. Input signals are attenuated through the attenuator and
converted to IF signals through the mixer in the down-converter (refer to
Architecture on page 1--6). The attenuation level and the mixer level are normally
set automatically. Select
RF Att
or
Mixer
to manually set either parameter, if
necessary. RF Atten/Mixer is unavailable in the baseband (DC to 20 MHz).
H
Auto. Sets the mixer level and the RF attenuation level automatically.
H
RF Att.
Sets the RF attenuation level with
RF Att
described below.
H
Mixer.
Sets the mixer level using the
Mixer Level
setting.
NOTE
. RF Atten/Mixer is set to Auto by default. In this setting, the mixer level is
fixed to --25 dBm.
RF Att.
Changes the RF attenuation level when
RF Att
is selected in
RF Atten/Mixer above.
Table 3- 19: RF attenuation level setting
Frequency band Attenuation level (dBm)
RF (WCA230A)
RF1 (WCA280A)
0 to 50 (2 dB step)
RF2, 3 (WCA280A) 0, 10, 20, 30, 40, or 50
Reducing the attenuation may increase the signal level compared to the noise
floor, because the noise is generated after the RF attenuator.
Mixer Level.
Selects the input level of the primary mixer when
Mixer
is
selected in RF Atten/Mixer .
Table 3- 20: Mixer level setting
Frequency band Mixer level (dBm)
1
RF (WCA230A)
RF1 (WCA280A)
--5, --10, --15, --20, or --25
RF2, 3 (WCA280A) --5, --15, or --25
1
- 25 dBm fixed when RF Atten/Mixer is set to Auto.
Select the level according to measurement type. The default value is --25 dBm.
Use the default value in most cases. This level can be increased up to --5 dBm
when a high dynamic range is required for measurements such as the ACPR
(Adjacent Channel Leakage Power Ratio) measurement.