LED Measurement System
User Manual
21
Ossila Limited © 2022
10.
Test Device
The system is shipped with a pair of test devices that can be used to verify the correct operation
of the system. One has
100 kΩ
resistors that can be used to check the calibration of the system.
The other has semiconductor LEDs to test the response of the light sensors. Both are arranged in
the geometry of the substrate pixels, and the appearance of the test device will depend on the
substrate system being used.
Figure 10.1.
Test device configurations.
10.1
Taking a Resister Measurement
1.
Plug in and switch on the system.
2.
Allow at least 30 minutes for the system to warm up.
3.
Place the test device in the device holder with the resistors facing upwards.
4.
Start the LED IVL software and enter the following settings in
I.
These settings can be used with any current range except for the 20 μA range. For
this range the start and end voltages must be lowered to -2 V and 2 V respectively.
II.
The ‘Pixels to Measure’ c
heckboxes should match the device configuration you
have.
Figure 10.2.
Measurement settings for the resistor test device.
5.
Click the ‘Measure’ button.
6.
The system should measure straight line resistor responses from -
100 μA to 100 μA (or
-
20 μA to 20 μA for the 20 μA current range) as shown in
7.
To check the calibration of the system, use the I-V data to calculate the measured
resistance at -10 and 10 V (-
2 and 2 V for the 20 μA current range).
Содержание T2005
Страница 27: ......
