The Spectrum Application
R&S
®
FPC
105
User Manual 1178.4130.02 ─ 07
ers. Two transducers can be switched on at a time. The second transducer must be
assigned the unit dB. The R&S
FPC adds the two transducers to a total transducer.
Units supported for transducer factors:
●
dB
●
dBμV/m
●
dBμA/m
●
W/m2
The unit dB does not change the unit set on the R&S
FPC. It can be used, for example,
to compensate for frequency-dependent loss and gain at the input of the R&S
FPC.
The units dBμV/m and dBμA/m convert the output power of an antenna into electric or
magnetic field strength. The unit W/m2 is used to calculate and display the power flux
density.
For example, to compensate for the cable loss between the transducer and the RF
input, the R&S
FPC can use two transducers at the same time. One of them must have
the unit dB, however, i.e. it must correspond to one loss or gain value.
Selecting transducer factors
1. Press the "Ampt" key to open the amplitude menu.
2. Select the "Transducer" menu item to open the transducer menu.
Note:
You can select two transducer factors, a primary transducer and a secondary
transducer.
3. Select the "Select Primary" menu item.
The R&S
FPC opens a submenu where you can select the transducer factor you
need.
4. Select the transducer factor you need and confirm the selection with the "Load"
menu item.
The R&S
FPC applies the correction values to the measurement results.
An example would be the transducer factor of the R&S
HL223 antenna that is defined
between 200
MHz and 1300
MHz. The R&S
FPC therefore displays the noise in this
frequency range as a function of frequency incremented by the transducer factor. Out-
side the transducer range, the R&S
FPC sets the transducer factor at zero, i.e. mea-
surements in this range do not yield conclusive results.
You can select a second transducer factor with the "Select Secondary" menu item. The
secondary transducer factor in that case is added to the first. The unit of the second
transducer factor must always be the relative unit dB as otherwise an addition would
not be useful. When you select a secondary transducer factor, the dialog box shows
only those transducer factors that have dB as their unit.
Setting the unit for measurements with transducers
If the unit of the transducer is dB, the units dBm, dBmV or dBμV remain unchanged.
The linear units volt and watt are not allowed. They are deactivated in the units menu.
Amplitude Configuration
