
9
PRODUCT SPECIFICATION
RC4200
Divider Circuit Offset Adjustment Procedure
1.
Set each trimmer pot to 0V on the wiper.
2.
Connect V
X
(input) to ground. Put a DC voltage of
approximatey 1/2 V
Z
(max.) DC on the V
Z
(input) with
an AC (squarewave is easiest) voltage of 1/2 V
Z
(max.)
peak-to-peak superimposed on it. Adjust X
OS
(R5) for
zero feedthrough. (No AC at V
0
)
3.
Connect V
X
(input) to V
Z
(input) and put in the
1/2 V
Z
(max.) DC with an AC of approximately 20 mV
less than V
Z
(max.).
Adjust Z
OS
(R
13
) for zero feedthrough.
4.
Return V
X
(Input) to ground and connect V
Z
(max.)
DC on V
Z
(input). Adjust output V
OS
(R
17
) for V
O
=
0V
O
5.
Connect V
X
(input) to V
Z
(input) and and in V
Z
(max.)
DC. (The output will equal K.) Decrease the input
slowly until the output (V
0
- K) deviates beyond the
desired accuracy. Adjust Z
OS
to bring it back into toler-
ance and return to Step 4. Continue steps 4 and 5 until
V
Z
reduces to the lowest value desired.
Notice that as the input to VX and VZ gets closer to zero (an
illegal state) the system noise will predominate so much that
an integrating voltmeter will be very helpful.
Square Root Circuit V
0
= N
V
X
Figure 8.
1/2 z
Vz
1/2 Vz
0V
10 mV
~
Vz
1/2 Vz
0V
65-1868
65-1877
RC4200
Multiplier
V
(Input)
S
O
S
ao
R
a
R
b
R1
R
-V
I
3
R
V
(Output)
+V
S
-V
3
6
4
5
8
7
1
2
R
c
R
d
I
2
I
1
I
4
REF
+V
R4
VR1Rb
2
+
RaRb
RaoRb
+
R0R4
VRcR4
0
Rd
VR
2
RcRd
+
+
+
=
If RaRb
RcRd and RaoRbR0Rd + RaoRbRcR4
RcRdR0R4
=
=
Then
R0R4
VR1Rb
VXK where K =
VRR1Rb
=
=
and V0
N VX where N = K
=
0
VX
VXmax.
(
)
and V0max.
(
)
£
£
N VXmax.
(
)
=
N
VX
---V0
(
)
=
R1
(
74
m
)
2
V0A N2
=
Ra
Rd
m
A
50
=
=
Rb
Rc
m
A
150
=
=
R4
(
m
A
)
V50
=
Rao
(
m
A
)
125
=
R
0
(
m
A
)
225
=