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Measuring
t0:
If the shutter is closed, opening must be triggered by setting the "do_open_shutter" bit in the
FPM command byte.
t1:
If the "shutter_is_open" flag is set in the FPM status word (status of the power module), this has
happened and the device is ready for measurement. "Do_open_shutter" can then be deleted.
t2:
To initialize the measurement, the "start" bit must be set in the FPM command byte.
t3:
As confirmation that the start command has been received, the measuring device sets the flag in
the FPM status word "acknowledge" and "idle" is deleted.
t4:
The "start" command in the FPM command byte must then be deleted.
t5:
When "start" has been deleted again, "acknowledge" is deleted.
t6:
When the device is ready for measurement, "measurement finished" in the FPM status word is
deleted and "ready" is set.
The focus module is now addressed. The command bits and status flags described below are those
contained in the focus module part (not FPM).
t7:
The measurement parameters (Setup No. or detailed measurement parameter) must be set
before the "start" flag is set.
t8:
By analogy with the handshake at the start of power measurement, the "start" bit is then set in
the command field for initialization.
t9:
As confirmation that the start command and the measurement parameters have been received,
the "acknowledge" flag is set, "idle" and "finished" are deleted. The results registers, error flags
and error identifiers are also deleted.
t10:
The "start" flag may then be deleted.
t11:
When "start" has been deleted again, "acknowledge" is deleted and "measurement running" is
set.
t12:
When "acknowledge" has been deleted again, this confirms that the measurement parameters
have been read in; they can then be changed as required (e.g. In preparation for the next mea-
surement).
t13:
When the device is ready for measurement, "ready" is set as a signal that the laser should now be
switched on.
t14:
The laser pulse can then be triggered ("Laser on" - fire at the absorber for the calculated time or
pulse duration measurement option). The laser pulse triggers the actual measurement.
t15:
When this has been completed, "measurement running" and "ready" are deleted.
Revision 06 EN 02/2023
73
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