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Functions and Characteristics
Copyright © Itech Electronic Co., Ltd. 37
Start Battery Test
In the BATTERY mode, you can press [.] (Trigger) to trigger the running of the
battery test. If the load does not detect the battery voltage, or if the stop
condition has been satisfied, the test will be stopped immediately and the input
of the load will be in OFF state.
During normal testing, the test time, the discharged capacity will be displayed
on the VFD in real time.
During the running of the battery test, the front panel can be locked to avoid
misoperation and interrupt the test process. If you need to lock the panel, press
[Shift]+[On/Off] (Lock) to lock all other keys except [Shift]+[On/Off] (Lock)
itself.
Stop Battery Test
Press [.](Trigger) or [Shift]+[.] (Trigger) or [ESC] to stop battery discharge test
(load input OFF).
Exit Battery Test
To exit the BATTERY mode, you can press the [Shift]+ [8] (System) buttons to
enter the system menu and set the RUNMODE to NORMAL.
3.10.5 CR-LED Test Function
With adding of diode break-over voltage setting in the IT8500+ series electronic
load under conventional CR mode, the electronic load only works when voltage
applied at its both ends is higher than the diode break-over voltage to give a
real simulation of diode working principle, i.e., the ripple current at real LED
test.
The I-V curve of LED is as shown below. Under conventional CR mode, the
electronic load only simulates the static working point of diode as shown in the
red circle of the following figure. It is unable to verify the dynamic characteristics
of LED under normal working conditions, and the status of accurate ripple
current.
Calculation method of Vd and R:
Definition:
Vo: constant working voltage of load LED of LED constant current source;
Io: output current of LED constant current source;
Vd: break-over voltage of diode (string);
R: constant resistance.
V-I curve of LED is as shown below.
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