1
O/P
2
I/P
470K
R15
470K
R16
10R
3
I/P
470K
4
COM
470K
R18
5
COM
6
I/P
470K
470K
10R
7
I/P
470K
8
O/P
470K
R22
0.1 µF
0.1 µF
9
O/P
10
I/P
100K
470K
11
I/P
12
I/P
0.1 µF
10R
J1
100K
100K
100K
10K
100K
50K
50K
+12
-12
16
O/P
15
I/P
14
I/P
13
I/P
(preset)
OFFSET
SCALE
cw to reduce gain
19
O/P
18
R/R
17
I/P
100K
100K
47K
10R
0.1 µF
470K
2 M
Ω
100K
RAMP RATE
cw to
increase rate
10 µF
10 µF
23
240
22
110
21
V+
20
V-
24
L
0.1 µF
0.1 µF
130 V
COIL
110 V
COIL
F1 100 mA
+12 V
-12 V
SQ1 -24 V
SQ2 +24 V
ON LAMP
CHANNEL 1 DIFFERENTIAL AMPLIFIER
CHANNEL 2 DIFFERENTIAL AMPLIFIER
CHANNEL 3 SCALE/OFFSET (preset)
CHANNEL 4 SCALE/OFFSET
CHANNEL 5 RAMP RATE
DANGER
ELECTRIC SHOCK RISK
Mechanical dimensions
470K
Z2
Z1
100K
4M7
0.1 µF
100R
J2
100K
100K
100K
10K
100K
50K
50K
+12
-12
cw for -ve
OFFSET
SCALE
cw to reduce gain
IC2
100K
close to preset
integrator
input to
integrator
output
OFFSET PRESET
internal reference
offset
10K
external
reference
pot
AC
POWER IN
110 V or
230 V
1 µF
R1
R2
for R1=R3
and R2=R4
High gain differential amplifier
V
out
R3
R4
V1
V2
CHANNEL 1 only
47K
470K
2.2 µF
100 nF
If the system is unstable and slowly oscillates, try adding another 1 µF at the
J1
position (CHANNEL 3).
The bipolar capacitor sets the integrator time constant.
If required, fit Zeners to clamp the output swing of the final stage -
Z1 Z2
positions (CHANNEL 3).
Options:
R20
R17
R19
R21
R24
R23
ANTI-CLOCKWISE
MID-WAY
CLOCKWISE
Terminals 1 - 6
Terminals 7 - 12
Terminals 19 - 24
Terminals 13 - 18
OFFSET
SCALE
RAMP
RATE
CH3 CH4
CH5
ON
90 mm
86 mm
5 mm
5 mm
Fixing screws: M4 x 20 mm
J1
J2
B
C
D
A
T9
CH4 DIFF
GAIN K1
T10
INTEGRATOR
PRESET INPUT
K2
T8
T7
CH5
RAMP RATE
REFERENCE
FEEDBACK
T11
T14
T15
E
G
F
A
C
H
D
J
OUTPUT
CH3 SCALE
CLOSE TO
PRESET
INTEGRATOR
C
D
A
F
E
integrator
preset
input
(+/- 10 V)
G
differential output
feedback
input
+/- 10 V
H
J
B
Z1
Z2
3
Channel information
3
3 Channel information
Channel information
Channels
Default operating mode
CHANNEL 1
Differential
amplifier having
unity gain.
Fit extra resistors
to the board to
change the gains.
CHANNEL 2
CHANNEL 3
Integrator circuit:
OFFSET
Use to zero integrator drift - usually set mid-way (unless
factory preset and sealed)
preset
SCALE
Set TOTAL GAIN, K2
A
CHANNEL 4
Summing amplifier:
OFFSET
Use as an on-board reference offset - mid-way for centre
position
B
SCALE
Sets the differential gain - start at minimum gain, K1
C
CHANNEL 5
An adjustable ramp that a/-10 V signals.
The ramp time is adjustable between 2 and 30 seconds
for a 0 to +/-10 V input. It sets the rate of the reference
change - a long ramp time gives a gradual change to a new
reference value.
To reset the output to zero, connect R/R (T18) to O/P (T19).
D
1
O/P
2
I/P
470K
R15
470K
R16
10R
3
I/P
470K
4
COM
470K
R18
5
COM
6
I/P
470K
470K
10R
7
I/P
470K
8
O/P
470K
R22
0.1 µF
0.1 µF
9
O/P
10
I/P
100K
470K
11
I/P
12
I/P
0.1 µF
10R
J1
100K
100K
100K
10K
100K
50K
50K
+12
-12
16
O/P
15
I/P
14
I/P
13
I/P
(preset)
OFFSET
SCALE
cw to reduce gain
19
O/P
18
R/R
17
I/P
100K
100K
47K
10R
0.1 µF
470K
2 M
Ω
100K
RAMP RATE
cw to
increase rate
10 µF
10 µF
23
240
22
110
21
V+
20
V-
24
L
0.1 µF
0.1 µF
130 V
COIL
110 V
COIL
F1 100 mA
+12 V
-12 V
SQ1 -24 V
SQ2 +24 V
ON LAMP
CHANNEL 1 DIFFERENTIAL AMPLIFIER
CHANNEL 2 DIFFERENTIAL AMPLIFIER
CHANNEL 3 SCALE/OFFSET (preset)
CHANNEL 4 SCALE/OFFSET
CHANNEL 5 RAMP RATE
DANGER
ELECTRIC SHOCK RISK
Mechanical dimensions
470K
Z2
Z1
100K
4M7
0.1 µF
100R
J2
100K
100K
100K
10K
100K
50K
50K
+12
-12
cw for -ve
OFFSET
SCALE
cw to reduce gain
IC2
100K
close to preset
integrator
input to
integrator
output
OFFSET PRESET
internal reference
offset
10K
external
reference
pot
AC
POWER IN
110 V or
230 V
1 µF
R1
R2
for R1=R3
and R2=R4
High gain differential amplifier
V
out
R3
R4
V1
V2
CHANNEL 1 only
47K
470K
2.2 µF
100 nF
If the system is unstable and slowly oscillates, try adding another 1 µF at the
J1
position (CHANNEL 3).
The bipolar capacitor sets the integrator time constant.
If required, fit Zeners to clamp the output swing of the final stage -
Z1 Z2
positions (CHANNEL 3).
Options:
R20
R17
R19
R21
R24
R23
ANTI-CLOCKWISE
MID-WAY
CLOCKWISE
Terminals 1 - 6
Terminals 7 - 12
Terminals 19 - 24
Terminals 13 - 18
OFFSET
SCALE
RAMP
RATE
CH3 CH4
CH5
ON
90 mm
86 mm
5 mm
5 mm
Fixing screws: M4 x 20 mm
J1
J2
B
C
D
A
T9
CH4 DIFF
GAIN K1
T10
INTEGRATOR
PRESET INPUT
K2
T8
T7
CH5
RAMP RATE
REFERENCE
FEEDBACK
T11
T14
T15
E
G
F
A
C
H
D
J
OUTPUT
CH3 SCALE
CLOSE TO
PRESET
INTEGRATOR
C
D
A
F
E
integrator
preset
input
(+/- 10 V)
G
differential output
feedback
input
+/- 10 V
H
J
B
Z1
Z2
typical image
