ES235 Datasheet, PDF (13/37 Pages) Cyrustek corporation – 4000 Counts DMM / Peak

ES235
4000 Counts DMM / Peak
1.10. Diode Measurement
Diode measurement mode shares the same configuration with 4.000V 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-
OL
2.500V 2.000V 2.500V 2.000V
The ES235 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
LED
1
FC1~4
0,0,1,0
SEL2
V+ or FLOAT
Full Scale
3.500V
Input Terminal
VR1 V.S. SGND
External Source
V
Internal Source
V+
ES235 / 236 / 238 / 239
OVH
PTC
PTC
LED Mode
Diode Mode
10M
LED
R
1.111M
OVSG
V 2.2
13
2015/12/15