HEIDENHAIN iTNC 530 HSCI - Page 99

10 – 100 HEIDENHAIN Service Manual iTNC 530 HSCI
Trigger 8 Set the trigger:
• Free run
The recording is started and ended by soft key. When you press the STOP soft key, the last
4096 points are saved.
• Single shot
When you press the START soft key, the next 4096 points are stored.
• Channel 1 to channel 6:
Recording begins when the triggering threshold of the selected channel is exceeded.
Trigger threshold
8 Enter the trigger threshold.
Edge 8 Define whether recording will be triggered with the rising (positive) or falling (negative) edge.
Pre-trigger The setting of the pre-trigger defines the duration of the recording after the trigger threshold is
reached.
 Pre-trigger = 0%:
4096 grid points are recorded beginning from the fulfilled trigger condition.
The trigger threshold reached first is on the left edge of the record (position of cursor 1).
 Pre-trigger = 25% (or 50% or 75%)
75% (or 50% or 25%) of the 4096 grid points beginning from the fulfilled trigger condition are
recorded.
The trigger threshold reached first is at 25%, in the middle or at 75% of the record (position of
cursor 1).
 Pre-trigger = 100%:
Recording is stopped. The last 4096 grid points before the fulfilled trigger condition are saved.
The trigger threshold reached first is on the right edge of the record (position of cursor 1).
Delta trigger You can specify a second trigger threshold in the oscilloscope, which enables you to use a value range
to define the event triggering a recording. Depending on the trigger edge and the first trigger value,
you can determine whether a trigger signal is output when the value range is reached or exceeded.
The inverse of the edge of the first trigger value is always selected as the active trigger edge of the
delta trigger. The delta trigger is given as a value relative to the first trigger threshold. If a value of zero
(0) is entered for the delta trigger (default setting), then the delta trigger is off.
8 Enter the second trigger threshold for a value range if needed.
Note
The height of the threshold depends on the expected signal amplitude.
The units of measure result from the signal type.
For the PLC signals M, I, O, enter a threshold of 1 or 0.
Note
If the trigger condition is fulfilled before the corresponding number of grid points have been stored
when the pre-trigger is set to 25, 50, 75 or 100%, then correspondingly fewer grid points are
recorded.