3-40

FIGURE 6. AC VOLTAGE MEASUREMENT USING OPTIONAL AVERAGING CIRCUIT

FIGURE 7. AC VOLTAGE MEASUREMENT USING OPTIONAL RMS CONVERTER CIRCUIT

ICL7652

20M

Ω

100k

Ω

50k

Ω

4

11

7

10

5

1

8

2

0.1

µF

1.0

µF

COM

43.2k

Ω

12

FULL

INT (V/

Ω)

ICL7149

COMMON

-

+

20M

Ω

0.1

µF

V-

ICL7652

4

11

7

10

5

1

8

2

0.1

µF

-

+

0.1

µF

V-

100k

Ω

5k

Ω

SCALE

ADJUST

10

0VAC - 400VAC

0Hz - 1000Hz

AD736

2

7

3

6

8

4

5

10

µF

1

12

INT (V/

Ω)

ICL7149

COMMON

+

+

2.2

µF

COM

FULL

10M

Ω

SCALE

ADJUST

4.99k

Ω

2.2

µF

5k

Ω

30k

Ω

10

0VAC - 400VAC

50Hz - 1000Hz

+

ICL7139, ICL7149