ES278 Datasheet, PDF (13/25 Pages) Cyrustek corporation – 4000 Counts Manual DMM

ES278
4000 Counts Manual DMM
1.13. Sleep
The meter enters sleep mode after auto power off. The SLEEP pin (pin43) asserts low (V-) in the
sleep mode, and asserts high (V+, not 0V) after re-power on.
1.14. 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.
1.15. Hazardous Voltage Indication
The ES278 could provide the AC/DC hazardous voltage indication for voltage/resistor/ diode
modes. Of course, the indication could support LCD symbol /LED /Buzzer driving simultaneously.
Especially ES278 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 still active.
HV indication criterion
Function / Range
DC voltage (typ.)
AC voltage (typ.)
AC mV
> +3V
OL
AC 4V
> +20V
OL
AC 40V – 1000V
> +100V
> 30Vrms
DC mV
OL
> 3Vrms (40-1kHz)
DC 4V
OL
> 20Vrms (40-1kHz)
DC 40V-1000V
> +30V
> 90Vrms (40-1kHz)
Freq. mode
> +40V
> 30Vrms (40-1kHz)
Res/Diode modes
> +10V
> 10Vrms (40-1kHz)
Note: If AC+DC signal is applied, the voltage criterion will be changed.
V 1.5
13
2015/12/11