User Manual
E727T0005, valid for E-727
BRO, 2019-06-28
Physik Instrumente (PI) GmbH & Co. KG, Auf der Roemerstrasse 1, 76228 Karlsruhe, Germany Page 72 / 240
Phone +49 721 4846-0, Fax +49 721 4846-1019, Email info@pi.ws, www.pi.ws
Pulse length definition
The value of the Pos. Distance Trig. High Time Definition parameter (ID 0x18000400) determines
how the trigger pulse length is set (i.e., the time the trigger output line is set to high):
Parameter value = 0 (default setting): The trigger pulse length varies depending on
the position distance set with <TriggerStep> and on the current velocity of the axis.
The trigger output line changes its level each time the axis has covered half the
TriggerStep distance.
Parameter value = 1: The trigger pulse length is constant. The trigger high time is
adjustable using the Position Distance Trigger High Time parameter (ID
0x18000401)
Switch to command level 1 with CCL to have write access to the parameters. To set the
parameters, use SPA or SEP. Furthermore, you can use WPA to copy the current values from
volatile memory to non-volatile memory, where they become the power-on defaults. To read the
parameter values, you can query with the SPA? or SEP? commands.
Variable pulse length depending on <TriggerStep> setting and current axis velocity:
The Pos. Distance Trig. High Time Definition parameter has the value 0.
Example: If TriggerStep is 100 nm, a rising edge of the trigger signal (low -> high) will be followed
by a falling edge (high -> low) when the axis has covered a distance of 50 nm. The next rising edge
follows when the axis has covered another distance of 50 nm, and so on.
Figure 17: Position Distance" Trigger Mode, trigger pulse length depends on the axis velocity
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