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Selecting Measurement Time
Select measurement time according to the purpose. Five modes are available for
measurement time.
Measurement
Operation explanation
time mode
In this mode, integration time
between 0.005s and 20s according to the
brightness of the measurement subject.
This mode emphasizes performance
when measuring low luminances.
NORMAL
In this mode, integration time is adjusted
between 0.005s and 6s according to the
FAST
brightness of the measurement subject.
This mode emphasizes measurement
time when measuring low luminances.
In this mode, several cycles of the
integration time for NORMAL mode are
taken and averaged. Under luminance
conditions which require an integration
time longer than the set luminance, the
MULTI
integration time will be the same as for
INTEG-
normal measurement.
NORMAL
This mode can be used when the
synchronization time for measurement is
unknown or when the synchronization
time is known but the frequency is
unstable. In such case, the sync mode
should be set to NO SYNC.
In this mode, several cycles of the
integration time for FAST mode are taken
and averaged. Under luminance
conditions which require an integration
time longer than the set luminance, the
MULTI
integration time will be the same as for
INTEG-
FAST measurement.
FAST
This mode can be used when the
synchronization time for measurement is
unknown or when the synchronization
time is known but the frequency is
unstable. In such case, the sync mode
should be set to NO SYNC.
This mode can be used when you want to set a
MANUAL
fixed integration time for measurements.
Integration time: 0.005s to 20s
* Time for sensor to measure light indicating "exposure time". On the other hand, measurement time shows time for
integration × 2 +Time to open/close shutter + Time for calculation), indicating time needed for actual measurement.
* Factory default setting : MULTI INTEG-NORMAL, IN-ND : AUTO
Feature
*
is adjusted
Improved accuracy
and repeatability for
luminances below
approx. 4 cd/m
2
(measurement angle: °)
Shorter measuring
times for luminances
below approx. 4 cd/m
(measurement angle: °)
Measurements which do
not depend on the
synchronization
frequency of the
measurement subject
can be taken.
Improved accuracy and
repeatability for
luminances below
approx. 4 cd/m
2
(measurement angle: °)
Measurements which do
not depend on the
synchronization
frequency of the
measurement subject
can be taken.
Shorter measuring times
for luminances below
approx. 4 cd/m
2
(measurement angle: °)
The desired fixed integration
time can be set.
29
Cautions
When measuring low luminances,
since the total measurement
time can be as long as 4
minutes, if the brightness of the
measurement subject changes,
the measurement results will
be the average luminance.
In addition, be careful to not
move the instrument during
measurement. When measuring
periodic light sources, MULTI
INTEG-NORMAL mode or
MULTI INTEG-FAST mode may
be more suitable, for example,
when the synchronization
frequency is unknown.
When higher accuracy and
repeatability are required
2
at low luminances, the
NORMAL mode should
be used if necessary.
Even for high luminances,
the set integration time (s or
longer) will be used.
Even for high luminances,
the set integration time (s or
longer) will be used
Be careful that the "OVER" error
message does not occur and that the
measurement accuracy is not reduced.
Examples of
measurement subjects
Constant light
sources (halogen
lamps, etc.)
Periodic light
sources (whose are
stable and whose
synchronization
frequency is
known)
Same as above
Periodic light
sources (whose
synchronization
frequency is
unknown or
unstable)
Periodic light
sources (whose
synchronization
frequency is
unknown or
unstable)
All light sources
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