11/01/05

6

ES51981

3 1/2 AUTO DMM

Note

:

1.Full Scale

Function Description

1.Operating Modes

1.1 Voltage Measurement

A reconfigurable voltage divider automatically provides a suitable range in voltage

measurement mode. The following table summarizes the full scale ranges in each

configuration.

Configuration

Full Scale Range

Divider Ratio

Resister Connection

VR1

200.0mV

1

-

VR2

2.000V

1/10

R2 / (R1+R2)

VR3

20.00V

1/100

R3 / (R1+R3)

VR3

200.0V

1/1000

R4 / (R1+R4)

VR5

2000V

1/10000

R5 / (R1+R5)

1. 200.0mV range only exists in manual mode.

2. In the 2000V range, if the digit numbers is larger than 1000V, LCD will display

“OL”.

The measurement of true RMS using ES636

If ES636 (or other true RMS-to-DC converter chip) is used for true RMS measurement,

the suggested application circuit is shown below. When ES636 is used for true RMS,

ADO and ADI pin short together, TEST5 pin keeps floating, and ACVL pin connects to

SGND. And the OVSG pin shorts to AGND through a switch.