External and auxiliary triggering is used to synchronize the triggering of the analyzer with other equipment.
Note: When an External Source is configured as an External Device, the PNA automatically controls all trigger settings. Do NOT make additional trigger settings. Learn more.
How to make Trigger Settings:
Controlling a Handler
Pulse Triggering (separate topic)
A 'Ready for Trigger' signal is different from a Trigger signal. The ready signal indicates that the instrument sending the signal is ready for measurement. The instrument receiving the ready signal would then send a trigger signal, indicating that the measurement will be, or has been, made. Usually the slower instrument sends the trigger signal.
Learn more about each type of triggering signal:
Meas Trig RDY and Meas Trig IN - This pair of signals is easy to use and limited in ability to configure.
AUX TRIG OUT and AUX TRIG IN - These two pair of connectors and signals are highly configurable. Use them to synchronize with any number of devices and equipment.
The MEAS TRIG connectors are located on the VNA rear-panel.
See how to access the Trigger Dialog Dialog SettingsTo cause the VNA to respond to Meas Trig IN or Handler I/O signals, select External on the Trigger Setup tab, Source setting. Note: You must select External when you use any external triggers. Also on the Trigger Setup tab, Scope setting, choose whether one external trigger signal will apply to ALL channels (Global) or one trigger signal per Channel. The following settings apply accordingly. Main Trigger Input Global / Channel Trigger Delay After an external trigger is received, the start of the sweep is held off for this specified amount of time plus any inherent latency.
Source The VNA accepts Trigger IN signals through the following connectors:
Level / Edge High Level The VNA is triggered when it is armed (ready for trigger) and the TTL signal at the select input is HIGH. Low Level The VNA is triggered when it is armed (ready for trigger) and the TTL signal at the select input is LOW. Positive Edge After the VNA arms, it will trigger on the next positive edge. If Accept Trigger Before Armed is set, the VNA will trigger as soon as it arms if a positive edge was received since the last data was taken. Negative Edge After the VNA arms, it will trigger on the next negative edge. If Accept Trigger Before Armed is set, the VNA will trigger as soon as it arms if a negative edge was received since the last data was taken. Accept Trigger Before Armed When checked, as the VNA becomes armed (ready to be triggered), the VNA will immediately trigger if any triggers were received since the last taking of data. The VNA remembers only one trigger signal. All others are ignored.
Ready for Trigger Indicator (Trigger Ready)On the VNA, when External is selected on the Trigger Setup tab, then both Meas Trig IN and Meas Trig Ready are enabled. Note: The Ready for trigger is available only when the trigger source is set at External. Choose a connector to send the VNA Ready OUT signal: Choose Polarity of the 'Ready OUT' signal.
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See how to access the Trigger Dialog Note: When an External Source is configured as an External Device, the VNA automatically controls all trigger settings. Do NOT make additional trigger settings. Learn more. AUX TRIG OUT and AUX TRIG INSee the AUX TRIG (1&2) connectors on the VNA rear-panel. These signals are highly configurable. They can be used with all types of external devices to send and receive signals. However, it is important to note that either Aux Trig INPUT does NOT trigger the VNA. That signal must be selected. See step 2 in the following procedure.
Dialog SettingsThe Aux Trig 1 and Aux Trig 2 tabs are identical. Two pair of connectors are available to allow two external devices to be controlled simultaneously. Enable Check to use the Aux1 or Aux2 connectors to output signals to an external device. Channel: This setting is controlled by a VNA Preference setting.
AUX TRIG OUT (To Device)The following settings control the properties of the signals sent out the rear panel AUX TRIG OUT (1&2) connectors: Polarity Positive Pulse Outgoing pulse is positive. Negative Pulse Outgoing pulse is negative. Position Before Acquisition Pulse is sent immediately before data acquisition begins. After Acquisition Pulse is sent immediately after data acquisition is complete. Per Point Check to cause a trigger output to be sent for each data point. Clear to send a trigger output for each sweep. When the Aux Trig - "Global" VNA Preference is selected, then the Point setting is made on the Trigger Setup tab. It then applies to ALL channels. When more than one channel is present, the channel setting that was made last is used. Pulse Duration Specifies the duration of the positive or negative output trigger pulse. Enable Wait-for-Device HandshakeWhen checked, the VNA waits indefinitely for the input line at the rear panel AUX TRIG IN (1&2) connectors to change to the specified level before acquiring data. This signal indicates that the external device is ready for VNA data acquisition. If the signal arrives before the VNA is ready to acquire data, it is latched (remembered). When NOT checked, the VNA does not wait, but outputs trigger signals when the VNA is ready. This signal does NOT trigger the VNA. The trigger signal is generated from Trigger Sources: Internal, Manual, or External. IN (READY) Positive Edge VNA responds to the leading edge of a pulse on the Aux1 or Aux2 In connector. Negative Edge VNA responds to the trailing edge of a pulse on the Aux1 or Aux2 In connector. Delay Time that the VNA waits after receiving the Handshake input before data acquisition begins.
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Note: Guided and Unguided Calibration CAN be performed in External Trigger mode. With this optional behavior, while Trigger Source is set to External, trigger signals must be sent for Calibration sweeps. This behavior does not apply to FCA calibrations. You can set a Preference to calibrate using Internal trigger signals while Trigger Source is set to External. The following dialog box appears on the screen while waiting for an External trigger signal. Click Abort to cancel the wait for a trigger signal. |