ZERO CROSSING
DETECTOR
BUFFER
BUFFER
1 µF
INTEGRATOR
COMPARATOR
C
AZ
C
STRAY
R
INT
FIGURE E-2A. PHASE l AUTO-ZERO
C
INT
V
IN
C
REF
3
1
2
6
5
4
A2
A1
A3
_
+
_
+
_
+
ZERO CROSSING
DETECTOR
ZERO CROSSING
DETECTOR
POLARITY
FF
POLARITY
FF
BUFFER
BUFFER
BUFFER
BUFFER
1 µF
1 µF
INTEGRATOR
INTEGRATOR
COMPARATOR
COMPARATOR
C
AZ
C
AZ
C
STRAY
C
STRAY
R
INT
R
INT
FIGURE E-2B. PHASE ll INTEGRATE INPUT
FIGURE E-2C. PHASE lll AND DE-INTEGRATE
C
INT
C
INT
V
IN
V
IN
C
REF
C
REF
3
3
1
1
2
2
6
6
5
5
4
4
A2
A2
A1
A1
A3
A3
_
+
_
+
_
+
_
+
_
+
_
+
ZERO CROSSING
DETECTOR
POLARITY
FF
BUFFER
BUFFER
1 µF
INTEGRATOR
COMPARATOR
C
AZ
C
STRAY
R
INT
FIGURE E-2D. PHASE lll AND DE-INTEGRATE
C
INT
V
IN
C
REF
3
1
2
6
5
4
A2
A1
A3
_
+
_
+
_
+
Figures E2. Main Analog Section of DVM Circuit - IC1 and IC2
Summary of Contents for 620A 4R
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