ES239 datasheet(13/36 Pages) CYRUSTEK

13 / 36 page

V 2.2

2015/12/15

ES239

6000 Counts DMM / Inrush

1.10. Diode Measurement

Diode measurement mode shares the same configuration with 6.000V manual voltage measurement

mode and has buzzer output to indicate continuity. The buzzer generates a 2KHz sound and ALARM1

(pin 56) drive high output (V+ level) whenever the reading is less than 30mV. If the test circuit is

open or the voltage drop between the two ports of the diode under test is larger than 2V or 2.5V

(depends on SEL2 pin level), the LCD panel will show “OL”.

SEL2

V+

DGND

Floating

V-

2.500V

2.000V

2.500V

2.000V

The ES239 also support a LED forward voltage measurement mode. It is necessary to use external

source to achieve the measurement. The following table & diagram summarizes the diode & LED

measurement mode.

Mode

SLACDC

FC1~4

SEL2

Full Scale

Input Terminal

LED

0,0,1,0

V+ or FLOAT

3.500V

VR1 V.S. SGND

LED

PTC

LEDMode

1.111M

10M

OVH

V+

OVSG

ES235 / 236 / 238 / 239

PTC

External Source

Diode Mode

Internal Source

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