ES239 Datasheet, PDF (17/36 Pages) Cyrustek corporation – 6000 Counts DMM / Inrush

ES239
6000 Counts DMM / Inrush
1.16. Auto Power Off And Idle Time Selection
ES239 has a default auto power off function. If the meter is idle for more than the given idle time
duration, the chip automatically turns the power off. The idle time to trigger the auto power off
function is determined by APOSEL pin. If APOSEL is connected to V-, the idle time will be set to 30
minutes. If pin APOSEL is floating, the Idle Time will be set to 15 minutes. When APO is occurred,
the state of the meter is reserved. The APO symbol on the LCD panel indicates whether the auto
power off is enabled or not. In some cases, user might want to disable Auto power off. There are two
ways to disable this feature as following:
1. Power on the meter when any of the push functions, except for HOLD, is pressed down.
2. In addition, when RS232 output is active, the auto power off function is also disabled
automatically.
Note: Powering on the meter while pressing HOLD and lasts 2 seconds turns on all LCD segments until HOLD
is pressed again.
1.17. Sleep
The meter enters sleep mode after auto power off. The SLEEP pin asserts low (V-) in the sleep
mode, and asserts high (V+, not 0V) after re-power on.
1.18. Re-Power On
After auto power-off, pushing any of the push function or changing the rotary mode can turn on
the meter again. If the meter is re-powered on by changing the rotary mode, the saved state is cleared.
If the meter is re-powered on by push functions, the chip restores the saved state and enters HOLD
mode. The LCD displays the saved value.
1.19. Hazardous Voltage Indication
The ES239 could provide the AC/DC hazardous voltage indication for
voltage/resistor/capacitor/diode modes. Of course, the indication could support LCD symbol /LED
/Buzzer driving simultaneously. Especially ES239 could detect the AC voltage in DCV mode and
detects the DC voltage in ACV mode. It means if not proper AC or DC voltage signal exists on the
DUT when DCV or ACV measurement mode is set, the HV indication will be active.
V 2.2
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2015/12/15