Setting the Amplitude Parameters R&S FSH
1309.6275.12 4.10 E-2
Entering the RF preamplification
T
o increase the input sensitivity of the R&S FSH, the device has an integrated 20 dB preamplifier
upstream of the input mixer. This is switched off in the default state and can be switched on for
measuring low power signals.
Press the AMPT key.
Press the RF ATT / AMP / IMP softkey.
The R&S FSH opens a sub-menu, to select RF
ATTENUATION, RF PREAMPLIFIER and
RF IMPEDANCE.
Using the rotary knob or the cursor keys to select
PREAMP ON or PREAMP OFF and confirm with the
ENTER key.
Entering the input impedance
Press the AMPT key.
Press the RF ATT / AMP / IMP softkey.
A submenu opens. The two input impedance options
“50 ” and “75 ” are displayed.
Select the input impedance you want using the
rotary knob or the cursor keys and confirm by
pressing the ENTER key.
Note: If you have selected 75
, and do not
incorrect level readings will be obtained.
Selecting a transducer factor
In many cases, the R&S FSH is not connected directly with the output of the device under test, but the
input signal is fed to the device via a cable, amplifiers or antennas, or a combination of these.
The R&S FSH can account for the frequency shifts of up to 2 connecting components in the measured
results. For this purpose, so-called transducer factors have been defined. These can be loaded into the
device with the R&S FSH4View software. Each transducer factor consists of a list of frequency/level
pairs, which describe the frequency shift of the measuring accessory. For antennas, the unit of the
measured electrical or magnetic field strength is included, for isotropic antennas in each case the
frequency stage for the x-, y- and z-directions.
You can enable two inputs (Primary/ Secondary Transducer) from the list of transducer factors loaded
in the instrument, so that, for example, the device can take a cable and antenna or cable and amplifier
combination into account. Note that only one of the two transducers selected can have a unit differing
from “dB”.
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