DCalibratorInit | 57
MeasurementTime
is the number of microseconds over which
the sample is taken in
DCalibratorMeasure
(page 59). This
parameter must be greater than 17 and less than 1,179,630.
When measuring a periodic source such as a display, sample
at an integer number of periods. Setting the proper integration
time for a display at a specific frequency is essential to
obtaining accurate, repeatable measurements. Each value
set in
MeasurementTime
is equal to one (1) microsecond.
Use this equation to find the integration time:
Multiply the integration time by the number of cycles you
want to measure (31 cycles are recommended). For example,
with a 75 Hz display, use this calculation:
Thus, the integration time is:
413,333 microseconds = .413 seconds
ReadTimeout
is the number of milliseconds to wait for data
when reading from the calibrator port.
You can still use Version 1 (one) of the structure, which does
not include
ReadTimeout
. If you do use Version 1 (one), the
ReadTimeout
value defaults to 2000 (2 seconds), and you
must set
Version
to 1 (one).
00010
6
00
-------------------- =
period of
integration time for one cycle
one cycle
1
75
------
10
6
×
31
×
413333
=
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