R&S NRP2 - Page 405

Programming Measurements
R&S
®
NRP2
387User Manual 1173.9157.02 ─ 03
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 rec-
ognized. 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.
C.4.2.2 Delay, Holdoff
Normally, the measurement immediately starts after the trigger event has been executed.
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.
Example
*RST
TRIG:SOUR INT 'triggering in response to a signal edge
Measuring with low-level commands