V 1.5

3

2015/12/11

ES218

2000 Counts Manual DMM

Pin Description

Pin No

Symbol

Type

Description

1-3

NC

-

Not Connected.

4

CINT

O

Polypropylene Film Capacitor type is recommended)

5

CAZ

O

High-resolution auto-zero capacitor connection.

6

RAZ

O

Buffer output pin in AZ and ZI phase.

7

CREFP

O

Positive connection for reference capacitor of A/D.

8

CREFN

O

Negative connection for reference capacitor of A/D.

9

VRH

O

Output of band-gap voltage reference. Typically –1.23V.

10

VR

I

Reference input voltage connection. Typically –400mV.

11

VR_ADP

I

Reference input voltage connection. Typically –400 mV.

12

OHMC3

O

Filter capacitor connection for resistance mode.

13

OHMC2

O

Filter capacitor connection for resistance mode.

14

OHMC1

O

Filter capacitor connection for resistance mode.

15

OR1

O

Reference resistor connection for 200.0

Ω range

16

VR5

O

Voltage measurement ÷10000 attenuator(1000V)

17

VR4

O

Voltage measurement ÷1000 attenuator(200.0V)

18

VR3

O

Voltage measurement ÷100 attenuator(20.00V)

19

VR2

O

Voltage measurement ÷10 attenuator(2.000V)

20

OVSG

O

Sense low voltage for resistance/voltage measurement

21

VR1

I

Voltage measurement Input. Connect to an accurate

10MΩ resistor.

22

mVin

I

Measurement input in 200.0mV mode.

23

OVX

I

Sense input for resistance / capacitance measurement.

24

OVH

O

Output connection for resistance measurement.

25

NC

-

Not Connected.

26

SGND

I

Signal Ground input.

27

ACVL

I

Rectified signal low input in ACV/ACA mode. Connect to negative output of

external AC to DC converter.

28

ACVH

I

Rectified signal high input in ACV/ACA mode. Connect to positive output of

external AC to DC converter.

29

ADI

I

Negative input of internal AC to DC OP Amp.

30

ADO

O

Output of internal AC to DC OP Amp.

31

TEST5

O

Buffer output of OVSG.

32

CAP

O

Positive auto-zero capacitor connection for capacitor measurement.

33

CAN

O

Negative auto-zero capacitor connection for capacitor measurement.

34

R10K

O

Connect to a precise 10

KΩ resister for capacitor measurement.

35

R1K

O

Connect to a precise

1KΩ resister for capacitor measurement.

36

NC

-

No connection

37

FREQ

I

Frequency counter input, offset V-/2 internally by the chip.

38

ALARM

O

HV signal detection in Voltage mode and EF mode indication output.