Datasheet

AD598
REV. A
–13–
EXC 1
EXC 2
LEV 1
LEV 2
FREQ 1
FREQ 2
B1 FILT
B2 FILT
OFFSET 1
OFFSET 2
SIG REF
SIG OUT
FEEDBACK
OUT FILT
A1 FILT
A2 FILT
AD598
0.1µF
–V
S
+V
S
1
2
3
4
5
6
7
8
9
10 11
12
13
14
16
15
17
18
19
20
V
B
V
A
+
V
0.015µF
0.1µF
0.1µF
0.33µF
0.01µF
1µF
30k
OUTPUT
MECHANICAL
POSITION
SCHAEVITZ E 100
LVDT
100Ω
10k
0.33µF
1000pF
150k
0.1µF
+
V
MASS ON SPRING
620 N/m
33 GRAMS
0.068µF
49.9k
4.99k
20k 47µF
47µF
33µF
+
25V
GND
POWER SUPPLY
+
V
LM675
EXC 1
EXC 2
LEV 1
LEV 2
FREQ 1
FREQ 2
B1 FILT
B2 FILT
OFFSET 1
OFFSET 2
SIG REF
SIG OUT
FEEDBACK
OUT FILT
A1 FILT
A2 FILT
AD598
0.1µF
–V
S
+V
S
1
2
3
4
5
6
7
8
9
10 11
12
13
14
16
15
17
18
19
20
V
B
V
A
+
V
0.015µF
0.1µF
0.1µF
0.33µF
INPUT
MECHANICAL
POSITION
SCHAEVITZ E 100
LVDT
4.99k
IN4740A
10V
GUARDIAN SOLENOID
12 VDC 2-INT-12D
62 CONE
Figure 24. Mechanical Follower Servo-Loop
EXC 1
EXC 2
LEV 1
LEV 2
FREQ 1
FREQ 2
B1 FILT
B2 FILT
OFFSET 1
OFFSET 2
SIG REF
SIG OUT
FEEDBACK
OUT FILT
A1 FILT
A2 FILT
AD598
–V
S
+V
S
1
2
3
4
5
6
7
8
9
10 11
12
13
14
16
15
17
18
19
20
V
B
V
A
0.015µF
0.1µF
0.33µF
0.1µF
–
V
0.1µF 0.1µF
+
V
R2
80.9kΩ
A
B
LVDT 1
C
D
LVDT 2
SCHAEVITZ E 100
V
OUT
=
(V
A –V B )+(V C –V D )
(V
A +V B )+(V C +V D )
• 500µA • R2
SCHAEVITZ E 100
V
OUT
±
10V
FULL SCALE
Figure 25. Differential Gaging