Tektronix LumaColor II J18, Instruction Manual

Page: 69 / 114

J18 Photometer Instruction Manual 6–3
Troubleshooting
If the J18 LumaColor

II Photometer or one of the J1800 Series
sensor heads does not appear to function correctly, the information in
this section will help you isolate the problem.
Basic Troubleshooting
This section lists some common problems and their most likely
causes.
The J18 Does Not Power On, or Backlight Does Not Light
Check the battery. Install a fresh battery, and ensure that it is seated
correctly. If the optional AC adapter is available, use it to connect
the J18 to a power source.
Measurements are Inaccurate
If measurements taken with the J18 are inaccurate or inconsistent,
check the operating setup:
H
Did you connect the sensor head to the J18 before power-on? If
not, turn the J18 off, cover the sensor–head, and then turn the J18
back on. The J18 will load data from a sensor head at power-on.
H
For luminance, radiance, and chromaticity measurements, make
sure that the sensor head is positioned so that the measurement
field is entirely filled by the surface to be measured.
H
For luminance, radiance, and chromaticity measurements, make
sure that the area being viewed by the sensor head is uniformly
illuminated.
H
Shadowing will occur if the surface is being measured from
direction of the illumination. Position the sensor head so that it
does not shadow the surface being measured.
J18 Photometer Instruction Manual 6–3
Troubleshooting
If the J18 LumaColor

II Photometer or one of the J1800 Series
sensor heads does not appear to function correctly, the information in
this section will help you isolate the problem.
Basic Troubleshooting
This section lists some common problems and their most likely
causes.
The J18 Does Not Power On, or Backlight Does Not Light
Check the battery. Install a fresh battery, and ensure that it is seated
correctly. If the optional AC adapter is available, use it to connect
the J18 to a power source.
Measurements are Inaccurate
If measurements taken with the J18 are inaccurate or inconsistent,
check the operating setup:
H
Did you connect the sensor head to the J18 before power-on? If
not, turn the J18 off, cover the sensor–head, and then turn the J18
back on. The J18 will load data from a sensor head at power-on.
H
For luminance, radiance, and chromaticity measurements, make
sure that the sensor head is positioned so that the measurement
field is entirely filled by the surface to be measured.
H
For luminance, radiance, and chromaticity measurements, make
sure that the area being viewed by the sensor head is uniformly
illuminated.
H
Shadowing will occur if the surface is being measured from
direction of the illumination. Position the sensor head so that it
does not shadow the surface being measured.