V 1.5

7

2015/12/11

ES278

4000 Counts Manual DMM

Function Description

1. Operating Modes

1.1.

Voltage Measurement

A re-configurable voltage divider provides a manual range in voltage measurement mode. The

400.0mV range is independent and manual mode. It takes input signal from mVin (pin22). The other

ranges take the input signal from VR1 (pin21). The following table summarizes the Full-Scale ranges

in each configuration.

Configuration

Full Scale Range

Divider Ratio

Resister Connection

Input Pin

VR1

400.0mV

1

-

mVin V.S. SGND

VR2

4.000V

1/10

VR2 (1.111MΩ)

VR1 V.S. SGND

VR3

40.00V

1/100

VR3 (101KΩ)

VR1 V.S. SGND

VR4

400.0V

1/1000

VR4 (10.01

KΩ)

VR1 V.S. SGND

VR5

1000V

1/10000

VR5 (1KΩ)

VR1 V.S. SGND

The ES278 support the hazardous live voltage warning. When the voltage measured exceeds the

30V, the buzzer generates 2KHz beep and ALARM (pin38) drive high output (V+ level)

periodically. It can remind the user to notice the hazardous voltage. The buzzer sound warning

could be cancelled by DISDGBP (pin41).

1.1.1. OL Selection

ES278 has a voltage OL selection feature archived by configuring the pin CESEL (pin40). In

1000V voltage mode, ES278 will show OL when the voltage is exceed the overflow level. If CESEL

is connected to DGND, ES278 will have a 1010V overflow level in voltage mode. If CESEL

connected to V-, the overflow level will be set to 610V in DCV and ACV mode. The configuration of

CESEL is listed below.

For ACV/DCV voltage modes:

CESEL

V-

DGND

Floating

DCV

610V

1010V

1010V

ACV

610V

1010V

760V