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Functions and Characteristics

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.

ITech IT8512A+ User Manual

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