FS9922-DMM4-DS-11 データシートの表示（PDF） - Unspecified

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FS9922-DMM4-DS-11

Integrated Circuits of 6,000 Counts Auto-ranging Digital Multimeter with Bar Graph

Unspecified 

FS9922-DMM4

12.10 AC Rectification Circuit

Diagram 18 is the average value rectification circuitry of FS9922-DMM4. In the circuit, AC signals enter IC

through R31, and then in the process of voltage division through R31, R30, R29, R28 and R27. The divided AC

signals come out from OP1O pin and enter IC through ADIP pin and ADIN pin after rectification. VR2 can adjust

the signal size to be the calibration of AC measurement.

Diagram 19 is the peak value rectification circuitry. Diagrams 20 and 21 are the true valid value rectification

circuitry. Users may determine which rectification circuit to select according to their needs.

R13

R12

R11 22k VR2 R9

C8

R8

100k

100k D3

C11

0.47uF

C10

2k

18k

4.7uF

90k

C12

27nF

C9 0.47uF

27nF

D2

R10

22k

ADIP ADIN OP2O

OP2N OP2P OP1O

R7

10k

OP1N

_

+

To ADC V- FS9922-DMM4

To ADC V+

INL

_

INH

+

To Digit Part

_

+

To ADC V+

Diagram 18: Average Rectification Circuit

Rev. 1.1

21/39

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