R&S FSH
Field-Strength Measurement with Isotropic Antenna
1145.5973.12 4.133
E-11
Changing the frequency span:
The frequency span set by the R&S FSH yields the most accurate measurement results. However,
signals near the measurement channel will no longer be detected. To provide an overview of the
spectrum outside the measurement channel, the frequency span can be changed up to a value ten
times the channel bandwidth during the channel power measurement.
Operation:
Press the SPAN key.
The AUTO SPAN softkey will have a green
background to indicate that the optimum frequency
range for the channel power measurement has been
set. MANUAL SPAN input will be activated for
immediately entering another frequency span.
Enter a new frequency span by using the numeric
keys and confirm the entry with the unit you want or
Change the frequency span by using the rotary knob
or cursor keys and confirm the entry with the
ENTER key or the MANUAL SPAN softkey.
The largest span that is permitted in the channel power measurement is ten times the channel
bandwidth. At larger spans, the result would be increasingly inaccurate, because not enough points of
the trace are located in the channel to be measured.
To reset the span to the optimum value, press the AUTO SPAN key.
To return to the menu for channel power measurement, press the MEAS key and then the Channel
Power softkey.
Measuring the maximum resultant field strength:
If signal levels fluctuate significantly, you can determine the maximum of the resultant field strength by
using the Max Hold function.
Operation:
Press the POWER DISPLAY softkey.
Select the MAX HOLD function by using the cursor
keys or the rotary knob and confirm with the
POWER DISPLAY softkey or the ENTER key. The
resultant field strength display will change from
"Level" to "Max Level".
To deactivate the MAX HOLD function, press the
POWER DISPLAY softkey.
Select the CLR/WRITE function by using the cursor
keys or rotary knob and confirm with the POWER
DISPLAY softkey or the ENTER key. The power
display will change from "Max Level" to "Level".
