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Zero Calibration
Zero calibration performs zero point adjustment while blocking entry of light into the measuring probe’s receptor.
Zero calibration must be performed whenever the POWER switch is set to ON.
1. Performing Zero Calibration
<Notes on Zero Calibration>
● If the luminance of the display to be measured is 0.5 cd/m
2
or less (if High luminance Measuring Probe(CA-
PH02/05), 1.0 cd/m
2
or less), perform zero calibration after elapse of 30 minutes or more after the POWER
switch is set to ON.
When measuring such a low-luminance display for a long period of time, perform zero calibration approxi-
mately every hour.
● Perform zero calibration if the ambient temperature has changed.
● Zero calibration can be performed anytime even if “PUSH 0-CAL KEY” is not displayed.
● Never press any keys during zero calibration. Doing so will cause completion of zero calibration to take more
time.
● When the optional 4-Probe Expansion Board CA-B04 is used
Zero calibration will be performed simultaneously with all the connected measuring probes.
[Operating Procedure]
Before starting zero calibration, check that a measuring probe is connected to the probe connector [P1] on the
instrument.
1. Check that the POWER switch is set to ON.
2.Place receptor area of measuring probe face down on a flat
surface so that no light reaches the receptor area.
Be careful because zero calibration can’t be done properly.
When the optional 4-Probe Expansion Board CA-B04 is used
Block the receptor of each measuring probe from light.
If there are any receptors not blocked from light, zero calibration
will not be performed correctly.
3. Press the 0-CAL key.
Measurement will start automatically at the end of zero
calibration.
3
2
1
“E1” is always displayed if the instrument is used for
the first time since shipment from the factory.
DARKEN PROBE
PUSH 0-CAL KEY
ZERO CALIBRATION
CH00 EXT Fd P1
E1 [
]
Message displayed
when the POWER
switch is set to ON
Press the 0-CAL key.
During zero calibration
End of zero calibration