R&S FSH
Power measurements on TDMA signals
1145.5973.12 4.43
E-14
Setting the measurement time
The measurement time (MEAS TIME) is the time over which the R&S FSH performs a power
measurement. A value less than or equal to the sweep time can be selected.
Press the MEAS TIME softkey.
The value entry box displaying the current
measurement time opens.
Using the number keys, enter a new measurement
time and terminate the entry with the appropriate
unit, or
Using the rotary knob or the cursor keys change
the measurement time and confirm with the
ENTER key or the MEAS TIME softkey.
If the measurement time you have entered is greater
than the sweep time, the R&S FSH outputs the
message "Maximum reached" and sets a
measurement time equal to the sweep time. If you
want to set a longer measurement time, you must
increase the sweep time first.
The minimum measurement time is the time
corresponding to one trace pixel (= sweep time /301).
Optimizing the reference level
To obtain the greatest possible dynamic range for burst signals, the lowest reference level possible
must be set. If this is not done, the R&S FSH will be overdriven by the measurement signal, if its
maximum level exceeds the maximum reference level. Because the R&S FSH’s resolution bandwidths
are implemented digitally after the A/D converter, depending on the resolution bandwidth selected, the
signal level at the A/D converter can be higher than the level indicated by the trace. To prevent the A/D
converter from being overdriven, the signal must be measured at the widest resolution bandwidth
(1 MHz) and video bandwidth (1 MHz) with the peak detector. The trace maximum then determines the
optimal reference level.
The R&S FSH’s LEVEL ADJUST routine will automatically determine the optimal reference level for
you.
Press the LEVEL ADJUST softkey.
The R&S FSH starts the measurement to determine
the optimal reference level, using a resolution
bandwidth of 1 MHz, a video bandwidth of 1 MHz and
the peak detector. While the measurement is in
progress, the R&S
FSH outputs the message
“Adjusting level for TDMA power measurement, please
wait... ".
The optimal reference level is then set.
深圳市盛腾仪器仪表有限公司
Tel:0755-83589391
Fax:0755-83539691
Website: www.Sengt.com
