A
A
B
B
C
C
D
D
E
E
4 4
3 3
2 2
1 1
0.1%
0.1%
0.1%
0.1%
0.1%
0.1%
0.1%
0.1%
0.1%
0.1%
Defib Protect
RFI Filtering
Input Buffers
Gain = 9.26
Wilson
Network
Lead Select
Diff Amp
Gain = 1
High Pass (0.05Hz or 0.5Hz)
Low Pass (150Hz)
Gain Stage
Gain = 74
RLD Amp
A/D Inputs
Leads Off
U501 U502 U503 U504 U505 U506 U507 U508
Shield
0.1%0.1%
620017.dsn
Rick Myers
Rick Myers
Mar 5, 1999
Mar 5, 1999
5-39121 JAC 3/15/99 LPP
L. Phillips
Z. Psenicnik
J. Bello
3/16/99
3/16/99
3/16/99
B See ECN worksheet
D
4/27/995-39455 LPP LPP
Improvements for ESD, RFI,
and Fast Transients, Correct
Respiration Diff-Amp Topology
5-39821 LPP 6/24/99
Mods to U2 clock line, Resp
gain amp, ECG supply and
NVRAM pullup
E LPP5-39936 7/9/99
LPP
620017
E
ECG Amp
C
5
8Wednesday, July 14, 1999
Title
Size
Document Number
Rev
Date: Sheet of
Welch Allyn Inc.
Schematic:
Release For Production
Approved
Checked
Designed
Drawn
Initial Date
REV
Description
ECN/ECO Init
Date Ckd
A Release to Production
U501-6
U502-3
U502-2
U502-5
U503-2
Right-Arm
aVR
aVL
aVF
LA
LA
LL
LL
LA
LL
V+
RA
RA
RA
mux-
mux+
diff+
U508-3
Q504-d
diff-
ecg-hp
D503-3
-clamp
D501-3
U501-5
U501-2
C514-2
U503-5
R509-1
R511-1
R513-1
R515-1
Left-Arm
Left-Leg
V-Lead
Right-Leg
U501-3
Q504-s
Q504-g
+clamp
U502-6
V-
U508-5
c539-1
c541-1
c538-1
c540-1
U508-6
u509-4
diff-out
u501-8
u508-2
D502-3
RL-mux
D504-3
D505-3
Q501-S
Mux-LdS-A
Sw-MonBw
Mux-LdS-B
Mux-LdS-C
RA
LA
LL
V+
VLdsOff
VLdsOff
VLdsOff
VLdsOff
VLdsOff
f+1.24V
fVcc
fVee
f+5V
vRL
+clamp
-clamp
Right-Arm
Left-Arm
An-ECG
Sw-RLD-RA
Sw-RLD-LA
Sw-RLD-LL
Sw-RLD-RL
Sw-RLD-V
fVcc
fVcc
fVee
fVee
fVcc
EEE
E E E
E
E
E
E
E
E
E
E
E
EE
E
E
E
E E E E E
EEEEE
E
E
E
E
E
E
E
E
E
E
E
E
E
E
E
S
S
S
S
S
E
E E
E
E
E
fVee
fVee
fVee
E
fVcc
fVcc
fVcc
fVee
fVcc
fVcc
fVcc
fVee
fVee
fVee
fVee
fVcc
fVee
fVcc
fVcc
fVee
fVcc
fVee
fVcc
fVee
fVee
fVcc
R506
10K
C520
.047uF
TP542
R559
22Meg
R517
10K
R507
10K
R555
30.1K
C530
.047uF
C525
.047uF
TP505
+
-
U507B
MC34002
5
6
7
84
R556
10K
C526
.047uF
C506
220pF
C543
.047uF
+
-
U507A
MC34002
3
2
1
84
C517
.01uF
TP539
C528
.047uF
N501
LAMP NEON
Q504
2N7002
3
1
2
R544
10K
TP501
C532
.047uF
R501
51.1K
TP557
R561
34.8K
D502
MMBD1503A
1
3
2
C527
.047uF
C501
220pF
R563
34.8K
TP538
R547
10K
C531
.047uF
R508
10K
R562
464K
C536
.01uF
R549
110K
TP540
TP524
C533
.047uF
TP518
TP530
R552
1K
TP509
R560
22Meg
C529
.047uF
TP559
R551
73.2K
TP551
R509
22Meg
TP502
D503
MMBD1503A
1
3
2
N502
LAMP NEON
TP517
R526
10K
C507
220pF
TP533
TP521
R502
51.1K
C502
220pF
TP556
Q505
2N7002
3
1
2
+
-
U501A
MC34002
3
2
1
84
R510
10K
TP513
TP511
R519
10K
+
-
U502B
MC34002
5
6
7
84
C541
330pF
TP543
R520
1.21K
+
-
U508B
AD712
5
6
7
84
C539
330pF
R511
22Meg
R548
1Meg
N503
LAMP NEON
C515
3.3uF
C508
220pF
C544
1000pF
TP555
TP522
R557
22Meg
R550
19.6K
TP549
TP550
D501
MMBD1503A
1
3
2
R503
51.1K
-
+
U509
LMC7101
4
3
1
25
TP515
TP503
D504
MMBD1503A
1
3
2
C503
220pF
TP531
TP537
R512
10K
TP527
+
C535
4.7uF
TP512
Q502
2N7002
3
1
2
+
C534
4.7uF
C523
.047uF
TP519
C519
.047uF
R521
10K
R545
10K
TP510
R513
22Meg
TP523
C538
1000pF
R523
10K
TP536
J501
CON6
1
2
3
4
5
6
R553
100K
TP504
R514
10K
C504
220pF
U504
DG202CSE
3
1
14
16
11
9
6
8
13
4
5
2
15
10
7
S1
IN1
S2
IN2
S3
IN3
S4
IN4
V+
V-
GND
D1
D2
D3
D4
TP558
R524
1.21K
TP508
R515
22Meg
TP535
N504
LAMP NEON
TP520
R518
1.21K
+
-
U503A
MC34002
3
2
1
84
R504
51.1K
R522
1.21K
D506
5.1V
13
TP514
C509
220pF
TP547
+
-
U501B
MC34002
5
6
7
84
TP526
C510
220pF
+
-
U503B
MC34002
5
6
7
84
D507
5.1V
1 3
C511
220pF
TP553
C540
1000pF
N505
LAMP NEON
R565
121K
R564
464K
C512
220pF
TP507
C513
220pF
D505
BAV99L
1
3
2
R516
10K
+
-
U502A
MC34002
3
2
1
84
R505
51.1K
R530 10K
C542
220pF
C505
220pF
R531 10K
C545
1000pF
TP532
R558
22Meg
R533 10K
R527
1K
TP554
R535 10K
TP506
C514
0.1uF
+
-
U508A
AD712
3
2
1
84
Q501
2N7002
3
1
2
TP525
R536 10K
C516
.047uF
R528
51.1K
TP560
TP552
R537 10K
TP516
R525
10K
TP548
C518
.047uF
R532 10K
R529 10K
C522
.047uF
C521
.047uF
R534 10K
TP529
U505
4051
13
14
15
12
1
5
2
4
6
11
10
9
3
168
7
X0
X1
X2
X3
X4
X5
X6
X7
INH
A
B
C
X
VDDVSS
VEE
TP561
C524
.047uF
R546
10K
TP528
U506
4051
13
14
15
12
1
5
2
4
6
11
10
9
3
168
7
X0
X1
X2
X3
X4
X5
X6
X7
INH
A
B
C
X
VDDVSS
VEE
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