v1.08

06/04/03

9

ES51911

11,000 Counts Auto DMM

1.2 Resistance Measurement

A re-configurable divider automatically provides a suitable full-scale range in

resistance measurement mode. The following table summarizes the full-scale ranges

and the reference resistors in each configuration. In 110.0MΩ, the maximum counting

number is 1100 counts and the resolution is 0.1MΩ. So the full scale becomes

110.0MΩ.

Configuration

Full Scale Range

Divider Ratio

Resister Connection

OR1

110.00Ω

R6

100Ω

OR2

1.1000KΩ

R5

1KΩ

OR3

11.000KΩ

R4

10KΩ

OR4

110.00KΩ

R1‖ R3

100KΩ

OR5

1.1000MΩ

R1‖ R2

1MΩ

OR6

11.000MΩ

R1

10MΩ

OR7

110.0MΩ

R1

10MΩ

1.3 Current measurement

ES51911 has 2 automatic and 1 manual current measurement modes for multimeter and

5 manual current measurement modes for clampmeter. The following table summarizes

the full-scale range of each mode. When ES51911 operate in the current measurement

modes for multimeter, It takes high input from pin IVSH or IVSL, low input from pin

SGND and reference voltage from pin VR. When ES51911 operate in the current

measurement modes for Clampmeter, It takes high input from pin ADP, low input from

pin SGND and reference voltage from pins VA+ and VA-. The test circuits are shown in

page 27-28.

Mode

Range Selection

Full Scale

Designed for

Automatic Mode 1

µA110.00µA / 1100.0µA

Multimeter

Automatic Mode 2

mA

11.000mA / 110.00mA

Multimeter

Manual Mode 1

A

11.000A

Multimeter

Manual Mode 2

A

1.1000A

Clampmeter

Manual Mode 3

A

11.000A

Clampmeter

Manual Mode 4

A

110.00A

Clampmeter

Manual Mode 5

A

1100.0A

Clampmeter

Manual Mode 6

A

11000A

Clampmeter

Note:

1. In Manual DC current measurement modes for clampmeter, ES51911 provides Zero function for offset

removing.

2. In Automatic mode1 and Automatic mode2, the pin VBAR is used to control the display of “µ” and

“m” sign on the LCD panel. If pin VBAR is floating or connected to DGND, the “µ” and “m” sign will

be displayed. If pin VBAR is connected to V-, the “µ” and “m” sign will not be displayed.