N123-135 Series
Snap Trac
Dual Signal Conditioner
SPECIFICATIONS
Drift:
(for each output as referred to its input)
<2.4µV/°C over temperature range
0°C to 50°C.
Long-term drift typically
<3µV/month.
Temperature Range:
-20°C to 50°C (-4°F to 122°F)
Power Required:
±15 VDC at ±22mADC, regulated,
3-wire
(±E) at terminals 12, 13, and 14.
This power is available from Model
N121-132A Snap Trac
Servocontroller.
TP13
TP4
TP5
TP2
TP1
Inputs:
Two differential inputs; one across
terminals 6-7, another across terminals
9-10.
Input signals may range from ±0.01
to ±1.0 VDC.
Input source impedance <1KΩ.
One single-ended input at terminal 3.
Insert R13 (10KΩ ≤ R13 ≤ 1.0 MΩ).
Outputs:
Summed signal outputs at terminals
1 and 2.
Outputs from individual differential
inputs at terminals 4 and 5.
Maximum output signals ≤±10 VDC.
Minimum load impedance ≥5KΩ each.
Frequency Response:
<–3dB down at 1600 Hz
(45° at ≈ 1250 Hz).
COMMON
R18
GAIN
R20
R19
R17
R21
A4
R14
R15
BIAS
R22
R16
R13
R8
R30
ZERO-2
ZERO-1
R34
R12
2
C3
C4
3
R9
R31
4
R10
5
R11
A3
1
The N123-135 Snap Trac Signal Conditioner provides stable amplification for
low level DC signals obtained from strain gage sensors such as load cells and
pressure transducers. This dual-channel module provides two independent
channels of signal conditioning with wide ranges of amplification and signal
zero adjustments.
Provisions are included for summing the two signals with precision
weighting. This may be used for an accurate force signal when sensing
pressures of an unequal-area cylinder.
R32
R33
6
R26
7
R5
SPAN-1
CH2
A1
R2
14
R1
R7
C2
C1
CH1
13
3.25 in x 5.50 in long
Maximum Component Height: 0.69 in
R6
R3
12
DIMENSIONS
R27
A2
R4
11
Plug-in connectors for quick installation of board.
Test points on all critical signals for easy system setup.
Component standoffs on all user-configurable components.
Twenty-turn potentiometers for all adjustable controls.
Rugged construction with solder mask for reliability.
R23
10
➢
➢
➢
➢
➢
R29
R24
9
Construction
SPAN-2
P1
8
FEATURES
R28
R25
MODEL: N123-135
SN:
N123-135 DUAL SIGNAL CONDITIONER SCHEMATIC
+E
C1
10uf
25V
+E
R8
100K
COMMON INPUT
R1
11
ZERO-1
CW
R9
C3
2MEG
.001uf
-E
{
CH1
-E
4
6
2 A1 OP-07CP
7
+E
R4
R2
10
3
10K
R3
9
10K
1MEG
3
SINGLE-ENDED
INPUT
R7
+
R5
SPAN-1 10K
100K
R6
CW
100K
-E
4
A3A 1
3 +
8 TL082CP
+E
R11
20K
2
E5
8
24.9K
{
7
6
+
CW
.001uf
SUMMED SIGNAL
OUTPUT (INVERTED)
3
2
10K
+
-E
4
A2
-
CH2
R29
6
100K
7
+E
R26
1MEG
R27
CW
SPAN-2 10K
R28
-E
4
5 +A3B
8
+E
R33
20K
R22
R34
10K
100K
1
SUMMED SIGNAL
NORMAL OUTPUT
(NON-INVERT)
4
DIFFERENTIAL
OUTPUT #2
R21
GAIN
5
R32
CW
10K
R19
-E
OP-07CP
R18
4.99K
C4
R31
2MEG
R23
R25
2
R20
10K
-E
R17
+E
ZERO-2
10K
DIFFERENTIAL
OUTPUT #1
TP2
+E
8
1
2 A4A TL082CP
4
-E
R24
5
R16
1MEG
DIFFERENTIAL
INPUT #2
-15VDC REGULATED
AT 22 mADC
3.01K
R30
100K
COMMON INPUT
12
INDICATES PIN-1 ON PCB
2MEG
100K
COMMON
R12
10K
R14
+E
13
TP5 (TEST POINT)
3
CW R15
C2
10uf
25V
-
R13
BIAS
+15VDC REGULATED
AT 22 mADC
R10
1MEG
DIFFERENTIAL
INPUT #1
-E
14
TP13
4.99K
10K
-E
6 4
5 +A4B
8
+E
TP1
7
E1
TL082CP
TP4
6
7
TL082CP
NOTES:
24.9K
1. ■ – INDICATES SQUARE PAD ON PCB (PIN 1)
2.
– INDICATES COMPONENT STANDOFF
3. NF – INDICATES “NO-FIT” COMPONENTS (NOT SUPPLIED)
4. CW – CLOCKWISE
5 R19 – USED TO CONFIGURE OP AMP FOR HIGHER DESIRED GAINS
ADJUSTMENTS
CIRCUITRY
One signal input is applied to
terminals 6-7 and the other to
terminals 9-10. Differential inputs are
used to improve noise immunity and
to allow several strain gage bridges to
be excited from a common power
source.
Output signals corresponding to
each input are provided at terminals 4
and 5, respectively.Typical gains of
output to input are 100 to 500
Volts/Volt.The two outputs are
summed at amplifier stage A4A, having
an inverted output at terminal 2 and
normal output on terminal 1.The gain
range of A4A is adjustable by R18
from 0.5 to 1.5 Volts/Volt. Higher
gains can be obtained by inserting a
suitable value of R19.
If e4 = rod end pressure and
e5 = piston head pressure, then the
signal at terminal 1 (e1) will be
proportional to piston force when
R34
___
R12
=
head end area
____________
rod end area
Select resistors from 10KΩ to 100KΩ.
BIAS potentiometer R15
provides zero output adjustment for
terminals 1 and 2 when terminals
4 and 5 are zero. R13 may be inserted
to give an additional input at
terminal 3.
ZERO 1 and 2 (R8 and R30) –
adjust null of outputs for zero
transducer conditions (e.g.
zero pressure).
SPAN 1 and 2 (R5 and R27) –
adjust gain to set maximum
signal sensitivities (e.g. +10
VDC outputs for maximum
pressure).
GAIN (R18) – adjusts gain to set
sensitivity of summed
signals (e.g. +10 VDC for
maximum differential pressure
across piston).
BIAS (R15) – adjusts bias of
summed signals.
MOUNTING:
Mount using Curtiss type TR-3
plastic track (Moog P/N 65419-1)
FORCE SERVO WITH UNBALANCED ACTUATOR
Model N123-135 Dual Signal Conditioning Amplifier Card can be used to process pressure signals to obtain a force feedback signal from an unequal area actuator.
Strain-gage type pressure transducers are often used in such applications.The Signal Conditioning Amplifier provides stable amplification of the millivolt-level strain-gage
outputs. DC voltmeters can be connected to Terminal 4 & 5 to give visual indication of hydraulic pressure.
MODEL N121-132A
SERVOCONTROLLER
(Snap-Trac Card)
26
27
230 VAC
50-60 Hz
28
SCALE
29
FORCE COMMAND
20
CMD or FBK
LOOP
GAIN-1
SUMMER
3
+Er (+10V)
16
-Er (-10V)
15
DRIVER
A1A
A1B
13
A2B
12
CMD INPUT
1
+E
21
+15V reg
19
-E
17
-15V reg
SERVOVALVE
R
Ps
12
MODEL N123-135
SIGNAL CONDITIONER
(Snap-Trac Card)
C2
13
C1
14
FORCE
ON
LOAD
2
+
BIAS
4
(Neg) ROD PRESSURE
5
(Pos) HEAD PRESSURE
ACTUATOR
ZERO-1
+
A3A
-
9
+
10
A1
-
+
+
-
GAIN
SPAN-1
11
-
A4A
STRAIN GAGE
PRESSURE
TRANSDUCERS
+
ZERO-2
8
A3B
+
7
-
6
A2
SPAN-2
-
Industrial Controls Division
Moog Inc., East Aurora, NY 14052-0018
Telephone: 716/655-3000
Fax: 716/655-1803
Toll Free: 1-800-272-MOOG
CDL6171 Rev B 500-190 798