Table Of Contents
Configure Trigger (Analog » Window) (G Dataflow)
Configures common properties for window triggering.
A window trigger occurs when a signal enters or leaves a window you specify with high level or low level.
trigger coupling
The method used to couple the trigger signal.
| Name | Value | Description |
|---|---|---|
| AC | 0 | Couples the trigger signal with an AC current. |
| DC | 1 | Couples the trigger signal with a DC current. |
| HF Reject | 3 | Couples the trigger signal with a high frequency reject filter. |
| LF Reject | 4 | Couples the trigger signal with a low frequency reject filter. |
| AC Plus HF Reject | 1001 | Couples the trigger signal with an AC current and a high frequency reject filter. |
Default: DC
trigger window mode
Specifies whether the trigger should occur when the signal is entering or leaving a window.
session in
Handle that identifies the NI-SCOPE instrument session as previously allocated by Initialize With Options.
error in
Error conditions that occur before this node runs.
The node responds to this input according to standard error behavior.
Standard Error Behavior
Many nodes provide an error in input and an error out output so that the node can respond to and communicate errors that occur while code is running. The value of error in specifies whether an error occurred before the node runs. Most nodes respond to values of error in in a standard, predictable way.
Default: No error
trigger source
The source you want the digitizer to monitor for a trigger.
| Name | Description |
|---|---|
| Channel 0 | Monitors Channel 0 for a trigger signal. |
| Channel 1 | Monitors Channel 1 for a trigger signal. |
| Channel 2 | Monitors Channel 2 for a trigger signal. |
| Channel 3 | Monitors Channel 3 for a trigger signal. |
| Channel 4 | Monitors Channel 4 for a trigger signal. |
| Channel 5 | Monitors Channel 5 for a trigger signal. |
| Channel 6 | Monitors Channel 6 for a trigger signal. |
| Channel 7 | Monitors Channel 7 for a trigger signal. |
| External TRIG | Monitors an external trigger input for a trigger signal. |
Default: Channel 0
low level
The voltage threshold for the digitizer to use for low triggering.
high level
The voltage threshold for the digitizer to use for high triggering.
trigger holdoff
The length of time the digitizer waits after detecting a trigger before enabling NI-SCOPE to detect another trigger.
Default: 0.00
trigger delay
The length of time the digitizer waits after it receives the trigger to start acquiring data.
session out
Reference to the NI-SCOPE instrument session to pass to the next node in the program.
error out
Error information.
The node produces this output according to standard error behavior.
Standard Error Behavior
Many nodes provide an error in input and an error out output so that the node can respond to and communicate errors that occur while code is running. The value of error in specifies whether an error occurred before the node runs. Most nodes respond to values of error in in a standard, predictable way.
Trigger System Operation
When you initiate an acquisition, the trigger system operates in the following manner:
- The digitizer waits for the start trigger, which is configured through the Start Trigger Source property. The default value is immediate.
- Upon receiving the start trigger, the digitizer begins sampling pretrigger points.
- After the digitizer finishes sampling pretrigger points, the digitizer waits for a reference (stop) trigger that you specify with an instance of Configure Trigger.
- Upon receiving the reference trigger and then after completing posttrigger sampling, the digitizer finishes the acquisition.
You specify configuration parameters such as the trigger source and trigger delay with each Configure Trigger instance. Additionally, you can adjust the amount of pretrigger and posttrigger samples using reference position in Configure Horizontal Timing. The default is half the record length.
For multirecord acquisitions, all records after the first record are started based on the setting of the Advance Trigger Source property. The default value is immediate.
