R&S NRP2, User Manual

Page: 86 / 437

Instrument Functions
R&S
®
NRP2
68 User Manual 1173.9157.02 ─ 03
4.2.1.3 Measuring the average power of burst signals
The "Burst Av" mode is the simplest way of measuring the average burst power. It is
available with the multipath power sensors (R&S
NRP-Z11/21/22/23/24/28/31/32) and
the R&S NRP-Z8x wideband power sensors.
When this mode is selected, the sensor itself detects the start and end of the burst; no
external trigger signal is required. The parameter "Dropout" for detecting the falling edge
and the parameters of the trigger menu, see
​
chapter 4.2.6, "Trigger settings" ,
on page 85, are different ways of providing a stable measurement. By using the param-
eters "Excluded from Start" and "Excluded from End", the start and end of bursts can be
excluded from the measurement. This means that signal overshoots can be omitted from
measurements, for example.
Find some background information in sections
​
"Dropout tolerance" on page 74 and
​
"Timing diagram of burst signals" on page 74).
For the most common mobile radio standards, the required settings can directly be loaded
via the "Recall Standard" dialog box in the "File" menu see
​
chapter 4.6.4, "Loading set-
tings for mobile radio standards" , on page 141.
► Select "Burst Av" in the "Mode..." dialog box opened via the "Sensor" menu.
Fig. 4-6: Mode dialog box / Burst Av
Dropout
Defines the end of the burst. If power keeps low for at least this time, the end of the burst
is assumed. Modulation-specific power drops that are shorter than the set value are
ignored.
Note: The "Dropout" parameter must not be longer than the interval between the end of
the burst and the start of the next burst.
SCPI command:
​
[SENSe<[1]..4>][:
​
POWer]:
​
BURSt:
​
DTOLerance
​
on page 272
Data acquisition and parameters