26
Setting
Selecting Measurement Speed
Select measurement speed according to the purpose. The following seven modes are available for
measurement speed.
Measurement
speed
Operation description
Dark
measurement
*2
Features Cautions
Example of
measurement
subjects
NORMAL
In this mode, integration time
*1
is
adjusted between 0.005 and 92
seconds (120 seconds for CS-2000Plus)
according to the brightness of the
measurement subject.
This mode emphasizes performance for
low luminance measurement.
[STANDARD
DARK]
Improved
accuracy and
repeatability for
luminance below
approx. 4 cd/m
2
(measurement
angle: 1°)
For low luminance measurement,
since the total measurement time can
be as long as 4 minutes, the
measurement results will be the
average luminance if the brightness of
the measurement subject changes. In
addition, take care not to move the
instrument during measurement.
When measuring flickering light
sources, the MULTI INTEG-NORMAL
mode or the MULTI INTEG-FAST
mode may be more suitable, for
example, when the synchronized
frequency is unknown.
Constant light
sources (halogen
lamps, etc.)
Flickering light
sources
(which are stable
and whose
synchronization
frequency is
known)
FAST
In this mode, integration time is
adjusted between 0.005 and 16
seconds according to the brightness of
the measurement subject.
[STANDARD
DARK]
Shorter time for low
luminance
measurement
below approx. 4 cd/
m
2
(measurement
angle: 1°)
When higher accuracy and
repeatability are required at low
luminance, the NORMAL mode
should be used if necessary.
Same as
above
SUPER-FAST1
In this mode, integration time is
adjusted according to the brightness of
the measurement subject. Reduces
measurement integration time to about
5% of the time needed in the NORMAL
mode.
[INTELLIGENT
DARK]
Shorter
measuring time
When higher accuracy and
repeatability are required at low
luminance, the NORMAL or
FAST mode should be used if
necessary.
Same as
above
SUPER-FAST2
In this mode, integration time is
adjusted according to the brightness of
the measurement subject. Reduces
measurement integration time to about
1% of the time needed in the NORMAL
mode.
[INTELLIGENT
DARK]
Shorter
measuring time
When higher accuracy and
repeatability are required at low
luminance, the NORMAL or
FAST mode should be used if
necessary.
Same as
above
MULTI
INTEG-
NORMAL
In this mode, several cycles of the
integration time for the NORMAL mode
are taken and averaged. Under
luminance conditions which require an
integration time longer than the set
luminance, the integration time will be
the same as for the NORMAL
measurement.
This mode can be used to measure
flickering light sources when the
synchronization frequency is unknown
or when the synchronization frequency
is known but the frequency is unstable.
In such case, the synchronization mode
should be set to [NO SYNC].
[STANDARD
DARK]
Measurements
which do not
depend on the
synchronization
frequency of the
measurement
subject can be
taken.
Improved accuracy
and repeatability
for luminance
below approx. 4 cd/
m
2
(measurement
angle: 1°)
Even for high luminance, the set
integration time (1 second or
longer) will be used.
Flickering light
sources
(which are
unstable and
whose
synchronization
frequency is
unknown)
MULTI INTEG-
FAST
In this mode, several cycles of the
integration time for the FAST mode are
taken and averaged. Under luminance
conditions which require an integration
time longer than the set luminance, the
integration time will be the same as for
the FAST measurement.
This mode can be used to measure
flickering light sources when the
synchronization frequency is unknown
or when the synchronization frequency
is known but the frequency is unstable.
In such case, the synchronization mode
should be set to [NO SYNC].
[STANDARD
DARK]
Measurements
which do not
depend on the
synchronization
frequency of the
measurement
subject can be
taken.
Shorter time for low
luminance
measurement
below approx. 4 cd/
m
2
(measurement
angle: 1°)
Even for high luminance, the set
integration time (1 second or
longer) will be used.
Flickering light
sources
(which are
unstable and
whose
synchronization
frequency is
unknown)
MANUAL
This mode can be used when you want
to set a fixed integration time for
measurements.
Integration time: 0.005 to 92 seconds
(120 seconds for CS-2000Plus)
[STANDARD
DARK]
The desired
fixed integration
time can be set.
Take care to ensure that the
“OVER” error message does not
occur and that measurement
accuracy is not reduced.
All light
sources
*1 Time for the sensor to measure light, indicating “exposure time.” On the other hand, measurement time shows time for integration
+ dark measurement time + time to open/close shutter + time for calculation, indicating time needed for actual measurement.
*2 For details on dark measurement, refer to p.89. Dark measurements set for each mode of measurement speed can be changed in the
measurement software.
* Factory default setting: NORMAL, IN-ND: AUTO
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