Fluke ScopeMeter 123 Service Manual page 158

1 2 3
ICAL
[1,F10]
R354 R356
GENOUT
[1,A2]
261E 261E
A V356
BC858 C
VDDAA
PROTECTION
V358 V359
BC868 BC868
5K11
B V353 R352
BZD27
C7V5
1K
OPTION
V354 R353
V360
BZD27
BYD17
C7V5
SENSE
[1,E10]
TRIG_A
[1,E10]
TRIG_B
[2,E10]
C
D
R375
E +5VA
[5,B16]
0E
R371
0E
R376
10E
R385 R377
+3V3A
[5,C16]
0E 1E
R378
10E
F
R381
10E
R393
10E
R394
G 1E
R395 R396
-3V3A
[5,C16]
0E 10E
C391 C392
R398
100n 10u
1E
H
4 5 6
[4,A11]
TP322
R322
TRIGLEV2
681K
R321
TRIGLEV1
681K
APWM_BUS
[4,D1]
TP321
TP301
R301
3K16
REFERENCE
GAIN
R305
10K
C314
VCC5REF
[D8] 10u
VCC5DT
[D11]
C382
100n R302 R310
10K 100K
VCC3ATR
[D11]
VCC3DT
[D11]
VCC3RAMP
[D11]
VCC3REF
[D8]
VCC3CML
[E9]
C381 C379 C378 C377 C376
100n 100n 100n 100n 100n
TP304
VEEATR
[C9]
C317
VEEDT
[D11] R312
22u
34K8
VEERAMP
[E11]
VEEREF
[C10] [D8]
VEECML
[E9] 2x
C398 C397 C396 C394 C393
100n 100n 100n 100n 100n
7 8
C322
1n5
R323 R324
C321 REFP
34K8 215K
1n5
R326 R327
562K 562K
REFN
TP310
REFATT 8
REFATT
7
GNDDISTR
GAINREFN 63
GAINREFN
REFN 64
REFN
REFP 62
REFP
VCC5REF 61
REFADCT [E5] VCC5REF
VCC3REF 60
[F5] VCC3REF
C313
VEEREF 58
[G5] VEEREF
T-ASIC
10u
57
GNDREF
GAINADCT 52
C301 GAINADCT
OQ0257
GAINADCB 54
100n GAINADCB
GAINPWM 56
GAINADCT GAINPWM
REFADCT 51
REFADCT
TP302 REFADCB 53
REFADCB
REFPWM1 55
REFPWM
DACTESTT 29
[5,K2] DACTEST
REFADCB
[4,E14]
R303 C303 TP309
10K 100n
GAINADCB
TP303
SDAT
[4,I7]
SCLK
[4,I7]
REFN
R306 C306
21K5 100n
50PPM
GAINREFN
TP306
R308
REFPWM2
21K5 [5,J7]
50PPM
REFP
R307
10K
TP307
REFPWM1 REFP
[5,J7]
C311 V301 * V302 *
R311 C312
100n 4041 4041
31K6 100n
GAINPWM
V301 OR V302
R309
See Ch.10, Rev. 14
10K
REF_BUS
[C11]
[1,D10] [1,F4]
[2,D10] [2,F3]
[4,C2] [4,C7]
[4,G6] [4,J1]
9 10 11
VCC5REF VCC3ATR
C356 C399
15 or18n FILM 100n
R391
1K
C357 TVSYNC
22n
SYNC. PULSE
R390 R392
464K 4K22
SEPARATOR
TP308
V395
C395
BC848C
47n
TVOUT
REF_BUS
[G8]
REFPWM1
R369
26K1
17 VCC3ATR
VCC3ATR [F5]
18 BIAS
BIAS
24 OHMA
OHMA
22 ACDCA
ACDCA
23 ACDCB
ACDCB
20 VCC5DT
VCC5DT [E5]
N301
25 VCC3DT
VCC3DT [F5]
21 VEEDT
VEEDT [G5]
26
GNDDT
50
TRACEROT
49
GNDRDAC
48 VCC3RAMP
VCC3RAMP [F5]
47
GNDRAMP
46 VEERAMP
VEERAMP [G5]
43
GNDCML
R331
45 RSTRAMP
RSTRAMP
10K
C331
C332
4p7
22p
TP331
R333
TP332
10K
C333
1p
RAMPCLK
TRIGDT
ALLTRIG
TP311
TP336
R337
HOLDOFF
10K
C337
C344
4p7
22p
R339
SMPCLK
10K
C339
1p
TP338
R342
TRIGQUAL
10K
C342
1p
Figure 9-3. Circuit Diagram 3, Trigger Circuit
9
Circuit Diagrams
9.2 Schematic Diagrams
12 13 14
RELAY
CONTROL
+5VA
V174
BCV65
6 1
R173
K173
348E
-3V3A
+5VA
V171
BCV65
10 1
R171
K171
348E
-3V3A
+5VA
V172
BCV65
10 1
R271
K271
348E
-3V3A
TRACEROT [1,E10]
[2,E10]
DTRG_BUS
[4,C5]
3
ST8088-2
00-01-12
ST8088-2.WMF
9-9