FS9922-DMM3

Rev. 1.1

3/35

Contents

1.

GENERAL DESCRIPTION .........................................................................................................................5

2.

FEATURES.................................................................................................................................................5

3.

MEASURING MODE ..................................................................................................................................6

4.

APPLICATIONS FIELD ..............................................................................................................................6

5.

BLOCK DIAGRAM .....................................................................................................................................6

6.

PIN ASSIGNMENT .....................................................................................................................................7

7.

PIN DESCRIPTION ....................................................................................................................................7

8.

TECHNICAL SPECIFICATION ...................................................................................................................8

8.1

Absolute Maximum Ratings ............................................................................................................8

8.2

Electrical Parameters.......................................................................................................................9

9.

MEASURING MODES SELECT............................................................................................................... 10

9.1

Coding Table................................................................................................................................... 10

9.2

ADP Input/User-Defined Symbols and Confirmation of Decimal Locations ............................. 11

10. KEYS DEFINITION................................................................................................................................... 12

10.1

RANGE Key ................................................................................................................................... 12

10.2

RELΔ/RS232 Key .......................................................................................................................... 12

10.3

HOLD/LIGHT Key .......................................................................................................................... 12

10.4

SELECT Key.................................................................................................................................. 13

10.5

HZ/DUTY Key ................................................................................................................................ 13

10.6

MAX/MIN DATA HOLD Key ........................................................................................................... 13

11. OTHER FUNCTIONS ............................................................................................................................... 13

11.1

The time for Auto Power-Off is set to be 15 minutes: ............................................................... 13

11.2

Alarm Condition............................................................................................................................ 13

12. APPLICATION .......................................................................................................................................... 14

12.1

FS9922_DMM3 Circuitry............................................................................................................... 14

12.2

FS9922-DMM3 Circuitry Components List ................................................................................. 15

12.3

Power Supply System .................................................................................................................. 15

12.4

Power Supply Circuit ................................................................................................................... 16

12.5

Base Power Source...................................................................................................................... 17

12.6

Trigger Reset Circuit .................................................................................................................... 18

12.7

Oscillation Circuit......................................................................................................................... 18

12.8

Buzzer Driver Circuit.................................................................................................................... 19

12.9

Mode Switch and Function Control Circuit ................................................................................ 19