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Trigger
Periodic Timer (Frame Trigger)
Pressing this key, when it is not selected, selects the internal periodic timer signal as the trigger.
Triggering occurrences are set by the Period parameter, which is modified by the Sync Source and
Offset. Pressing this key, when it is already selected, accesses the periodic timer trigger setup functions.
If you do not have a sync source selected (it is Off), then the internal timer will not be synchronized with
any external timing events.
Periodic Timer Triggering:
This feature selects the internal periodic timer signal as the trigger. Trigger occurrences are set by the
Periodic Timer parameter, which is modified by the Sync Source and Offset.
The figure below shows the action of the periodic timer trigger. Before reviewing the figure, we’ll
explain some uses for the periodic trigger.
A common application is measuring periodic burst RF signals for which a trigger signal is not easily
available. For example, we might be measuring a TDMA radio which bursts every 20 ms. Let’s assume
that the 20 ms period is very consistent. Let’s also assume that we do not have an external trigger source
available that is synchronized with the period, and that the signal-to-noise ratio of the signal is not high
enough to provide a clean RF burst trigger at all of the analysis frequencies. For example, we might want
to measure spurious transmissions at an offset from the carrier that is larger than the bandwidth of the RF
Dependencies: No effect except in zero-span, but not locked out in nonzero spans.
Blanked in modes that do not support zero-span measurements. If the SCPI
command is sent when the key is blanked, an error is returned: –221,
“Settings conflict; Feature not supported for this measurement”
In analyzers shipping N9060A, this feature requires N9060A–7FP.
Preset: OFF
State Saved: Saved in instrument state
Initial S/W Revision: A.11.00
Key Path:
Trigger
Example: TRIG:SOUR FRAM Swept SA measurement
TRIG:<meas>:SOUR FRAM Measurements other than Swept SA
State Saved: Saved in instrument state
Readback: [Sync: <value of Sync Source>], for example, [Sync: External 1]
Status Bits/OPC dependencies: The Status Operation Register bit 5 "Waiting for Trigger" is set at the same
time as the Sweeping or Measuring bit is set. It is cleared when the trigger
actually occurs (that is, after the trigger event occurs and all the applicable
trigger criteria have been met). A corresponding pop-up message ("Waiting
for trigger") is generated if no trigger signal appears after approximately 2 sec.
This message goes away when a trigger signal appears.
Initial S/W Revision: Prior to A.02.00