11/01/05

8

ES51984

3 3/4 CAP AUTO DMM

1.2 Current measurement

Current measurement has three modes. The following table summarizes the full scale

range of each mode.

Mode

Range Selection

Full Scale

Automatic Mode 1

µA

400.0µA / 4000µA

Automatic Mode 2

mA

40.00mA / 400.0mA

Automatic Mode 3

A

40.00A / 4.000A

Manual Mode

A

40.00A

1.3 Capacitance Measurement

The following table summarizes the eight ranges of capacitance measurement mode.

Configuration

Full Scale Range

Resistance Ratio

C1

4.000nF

R1

C2

40.00nF

C3

400.0nF

C4

4.000µF

R4

C5

40.00µF

-

C6

400.0µF

-

C7

4mF

-

Note:

1. In order to obtain an accurate reading, a capacitor must be discharged before

measurement begins. The chip has a built-in discharge mode to automatically

discharge the capacitor. In discharge mode, the LCD displays DS.C

2. Discharging through the chip is quite slow. We recommend the user to discharge the

capacitor with some other apparatus.

1.4 Continuity Check

Continuity check shares the same configuration with 400.0Ω manual resistance

measurement mode, but with buzzer output to indicate continuity. The buzzer generates a

2KHz sound whenever the digit number less than 25Ω. Because the cycle time of

measurement is only 70ms, the least significant digit will not display.

1.5 Diode Measurement

Diode measurement mode shares the same configuration with 4.000V manual voltage

measurement mode. If the test circuit is open or the voltage drop between the two ports

of the device (diode) under test is larger than 2V, the LCD panel will show “OL”. The

buzzer generates a 2KHz sound whenever the digit number is less than 0.25V. Because