The PRO8000 (-4) / PRO800 “ELCH” – macro functions
Pro8000 system / page
50
3.7.3.3 Number of measured values for every step
This defines how many different values depending on the chosen variable are to be
registered. If e.g. one wants to measure the dependency of laser power from laser
current (P-I) on has one dependent value (P) and thus n is set to1.
(The default setting for n is 1).
In maximum 8 dependent values can be registered.
Programming:
:ELCH:MEAS n
with 1
≤
n
≤
8
Reading:
:ELCH:MEAS?
3.7.4 Cascading several ELCH runs
It’s not necessary to read out the measured data immediately after an ELCH run. In
certain cases it might be useful to cascade several runs, e.g. to allow for a ‘nonius-
like’ scale spreading of certain regions in the measured characteristic.
Just start the next ELCH run (with changed parameters) when the preceding one has
stopped.
But care must be taken, not to exceed a maximum of 1001 measurement steps (each
with a maximum of 9 data, 1 independent and 8 dependent values).
n=1001 is the maximum number of measurement steps, which can be stored in the
PRO8.
If the total number of measurement steps exceeds 1001, the overhead will overwrite
the values measured at the beginning (ring memory architecture)!.
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