Fluke ScopeMeter 123 Service Manual page 156

GENOUT
[3,A1]
C111
4p7
R105
511E
C113
B
4p7
R108
511E
Ohms/F
K173
5 4
K173
2 3
C104
120p
C C199
470p
ptc
R172
HF
500E
D
CHANNEL A
4 PROBE_A
C148
10n
E
R101
2
487K
3
INPUT A
ptc C102
(red input) 100n
+
R106
500E
INPUT
BLOCK
F
X100
1
COMMON
(black input)
G
R110 R111 R112 R113
2K15 10M 10M 10M
C112
4p7
+
C105
R120
10u
10M
C114 C116
4p7 4p7
R117
215E
C118 C119
4p7 4p7
R125
68E1
C117
10p
C122 C123
4p7 4p7
R119
R116 464E
215E
C121 C124
33p 33p
R118 R121
68E1 68E1
C107
470p
AC/DC
R109
[4,I7]
2K15
C101
R103
22n
1M
LF
2 3
4
R102 R104
487K 26K1
R137 R138 R139 R140
56K2 56K2 56K2 56K2
R141 R143
215K 909K
50PPM 50PPM
C106
4n7 R142 R144
C142
147K 348E
1n
50PPM
REFATT
REF_BUS
[3,H8]
7
N101
10 8
DCBIAS VATTP3V3
R114 11
GNDATT
10M
9
VATTN3V3
13
HF0
33
VAMPPSUP
14 34
SWHF0 GNDREF
12
GNDHF0
16 32
HF1 VAMPN3V3
7
VP5V
17
SWHF1
15 3
GNDHF1 GNDDIG
19 30
HF2 VDIGN3V3
6
VDIGN3V3
4
CERR1
C158
18 150p
SWHF2
20 5
GNDHF2 CERR2
1
POS
21
HF3
22
C131 GNDHF3
0p82
35
FB0
R131
1M 44
C132 OFFSET
50PPM
4p7
37
FB1 C-ASIC
C153
R132
OQ0258 22n
100K
C133
50PPM
47p
38 24
FB2 DACTEST
R133
10K
C134
50PPM
470p
40
FB3
R134
1K 27
C136 ADC
50PPM
4n7
41
FB4
R136 28
MIDADC
100E
50PPM 39
FBC
1206
29
TRIGGER
42
LF
2 23
GPROT ADDRESS
36
CALSIG
43 31
PROTGND TRACEROT
C145
1n SCLK SDAT C159
R146
C146 100p
215K
1n
8 9
R182
10E
+
C182 C181
100n 22u
R184
10E
C184
R186
100n
10E
C186
100n
R189
10E
R188
10E
C189
C188 + C187 100n
100n 22u
C190 C191 C183
100n 100n 22u
TP151
R151
100K
C152 R152
15n 100K
TP152
R153
OFFSET_A
681K
R155
R154
178K
681K
TP153
R161 R156
100K 100K
R160
51K1 C156
TP154
1n
348E
R157 TP155
TP156
R158
287E
100E
R165
R159
100E
C162
4p7
Figure 9-1. Circuit Diagram 1, Channel A Circuit
9
Circuit Diagrams
9.2 Schematic Diagrams
10
L181
47u +3V3A
[5,C16]
L182
47u -3V3A
[5,C16]
L183
47u +5VA
[5,B16]
APWM_BUS
[4,D1]
POS_A
REF_BUS
[3,H8]
REFN
DACTESTA
[5,J2]
ADC_A
[4,B1]
C161
100n
MIDADC_A
[4,C1]
TRIG_A
[3,C1]
SENSE
[3,C1]
TRACEROT
[3,F13]
SDAT
[4,I7]
SCLK
[4,I7]
ICAL
[3,A1]
1
ST8086
970604
ST8086.WMF
9-7