the minimum value of LED current. Using the button “Display mode” (13)

select the LED current display mode. The green LED indicator “I” (18) will be

turned on. On the LC display (2) you will see the measured current of the LED

(approximately zero).

а

b

Fig.9. a - the LED current adjuster, b – the mode of LED current indication.

9. Using the button “Freq” (8) select one of four values of frequency. In the case of

working in the pulse mode select the requisite value of pulse duration by adjusting

а

b

Fig.10. a – the button of frequency selection and the indicators of selected frequency,

b – the multiposition switch for adjusting the pulse duration.