FS9922-DMM3 datasheet(15/35 Pages) FORTUNE

15 / 35 page

FS9922-DMM3

Rev. 1.1

15/35

12.2

FS9922-DMM3 Circuitry Components List

No.

Spec.

No.

Spec.

No.

Spec.

No.

Spec.

82k

R21

49.5Ω

C9 C10

0.47μF

BUZZER

Buzzer

R2 R5 R12

R13

R17

R23

R24

R26

100k

R25

900k

C11

C12

C13

C14

C15

27nF

PTC

1.2k

Thermistor

R3 R6 R35

R27

C16

10nF

VR1 VR3

10kΩ

R22

R33 R34

R29

101.01k

LED Diode

VR2 VR4

2kΩ

R7 R28

10k

R30

1.111M

D2 D3

1N4148

3V Battery

90k

R31

10M

D4 D5

1N4004

OSC1

Oscillator

28.7k

R36

220Ω

Receive

Diode

S1~S7

Function

Keys

R10 R11

22k

R37

Launch

Diode

KP2-6

Mode Switch

R14

20k

R38

18k

FS9922-

DMM3

connector

R15

40k

1μF

Q1 Q2

9013

U1~U4

Probe

R16 R32

45k

C3 C4 C5 C6

C19

10μF

LCD

R19

0.005Ω

0.1μF

20A

fuse

tube

R20

0.495Ω

4.7μF

82k

R21

49.5Ω

C9 C10

12.3

Power Supply System

VB is the bias current input point in IC. The increase of R1 will reduce the current consumption in IC, but

the shortage of bias current will affect the input range of AC measurement.

REFI

REFO

RLCD

VDDA

VGG

VDD

AGND

VSS

R15

40k

100k

R14

20k

100k

10uF

VR1

10k

FS9922-DMM3

Diagram 4:

Power Supply Circuit

FS9922-DMM3 Fiches technique(PDF) 15 Page - Fortune Semiconductor Corp.

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