V 1.1 

13 

2016/08/16 

ES277

4000 Counts DMM

1.15. Hazardous Voltage Indication

The ES277 could provide the AC/DC hazardous voltage indication for voltage/resistor/ diode

modes. Of course, the indication could support LCD symbol / LED (ALARM pin) /Buzzer driving

(Buzzer could be disabled by DISDGBP pin) simultaneously. Especially ES277 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 device under test when DCV or ACV measurement mode is set, the HV

indication will be 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

> +70V

> 40Vrms (40-1kHz)

Res/Cap/Diode modes

> +10V

> 10Vrms (40-1kHz)

Note: If AC+DC signal is applied, the voltage criterion will be changed.