Annex
NRP2
389User Manual 1173.9140.02 ─ 07
ual operation, a trigger event is not expected in the "ContAv" mode. Since the mea-
surement is to be performed continuously, the trigger source (TRIGger:SOURce
) is
set to IMMediate.
If triggering needs to occur in response to a rising signal edge, the trigger system has
to be configured with TRIG:SOUR INT and TRIG:SLOP POS:
Example
*RST
TRIG:SOUR INT 'triggering in response to a signal edge
TRIG:SLOP POS 'triggering in response to a rising signal edge
INIT
FETCh?
The settings of commands TRIG:SOUR and TRIG:SLOP are ignored in the "BurstAv"
mode. In this mode the beginning and the end of the power pulse are automatically
recognized. For this reason, the instrument always triggers INTernal even if
TRIG:SOUR has a different setting.
If a trigger signal is to be routed to the instrument rear panel via the external trigger
connector, the trigger source has to be configured with TRIG:SOUR EXT
.
Example
*RST
TRIG:SOUR EXT 'triggering in response to the edge of an external signal
TRIG:SLOP POS 'triggering in response to a rising signal edge
INIT
FETCh?
TRIG:SOUR BUS can be set if measurements are to be started with *TRG or GET. This
procedure is provided by standard IEEE 488.2, which stipulates that *TRG or GET can
also be used to perform complete measurements. This includes the generation of an
answer, the measurement result. In the R&S NRP2, *TRG does not have this meaning:
*TRG only executes a trigger event and thus only causes the status transitions from
WAIT_FOR_TRG to MEASURING. *TRG delivers no measurement result and has no
effect if TRIG:SOUR is not set to BUS or if the instrument is not in the state
WAIT_FOR_TRG. The latter situation applies, for example, if the R&S NRP2 is IDLE,
i.e. INIT:CONT ON is not set nor was INIT executed.
Delay, Holdoff
Normally, the measurement immediately starts after the trigger event has been execu-
ted. This may not be desirable if the measurement is to be started before or after the
trigger point. The start of the measurement with reference to the trigger point can be
offset using the TRIG:DEL command. A negative sign means that the measurement
begins before the trigger point. This is possible because the sensors store sampling
values for a while and can use past values when the measurement is started. The
command is also used when overshoots are to be ignored at the beginning of a power
pulse.
Programming Measurements
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