Fluke 78 - Page 63

Schematic Diagrams
5
5-7
FLUKE 78-1201
(2 of 3)
10k R20
.027 C9
R22
1.00M
1.00M
R21
.47 C11
131.072kHz
Y1
385 VR1
56.2k R24 205k R25 33k R27 100k R28
Q6 3906
Q5 5089
4096Hz LS1
33k R23
2.2k R29
J3
J1
J2
E1
1.111M
Z1
1.0001k
Z1
10.01k
Z1
101.01k
Z1
9.996M
Z1
16.606k
Z1
190.00k
Z1 Z1
166.06k
AC
DIODE
OHMS, TEMPERATURE,
U1
SENS
FILTER*
DIODE TEST
RPM
OTD
BPR
INT
AZ
B.04
B.4
B1
AFO
FAO
FAI
AFI
AVOP
AVOM
AVIM
ACBO
ACBM
REFJ
LOTR
OTD
LO HI
AGND AIN DTS
A/D BUFFER
FILTER ACTIVE
AC
FREQ
COUNT
CONV
COMPARATOR
INTEGRATOR
TO
DIGITAL
SECTION
OSCO
OSCI
COMPARATOR FROM
DIGITAL SECTION
DTD
AP8
RRS V4 V3 GRD V2 V1
MULTIMETER
INTEGRATED
V0 CC
AC BUFFER
AMPS
VOLTS
OHMS
OHMS*
AMPS DC
REFJ
DCV,OHMS
TEST
OHMS
DC DC
AC
4VAC
OHMS
FILTERAC
READ
FILTER
3
32 2
1 0.4 .04
FILTER*
BPR TO
IC
REFI
REFH
VDD
R19
22.25k
S1
S1
S1
S1
CW
100k R26
R12 4.7M
R40 1.0M
0.1
C5
150k R17
20.0k R16
J4
10
C6
40% 1k RT1
t
+
10k R46
R45 1.00M
R44 56.2k
43.2k R42 100k R43
Q12 5087
5089
Q11
1.00M
R41
U4 TLC393
Q3 5089
.47
C20
+VP
VO
GND
U3 LM35
R14
22.25k
.47
C4
Q13
5089
26.1k R47
205k R48
R15 20.0k
R49 205k
TP5
U4 TLC393
R11 .0100
150pF C3
Q4 SEL
R2
1.00M
C1 .01
RV1 910V
R3 1k
R4 1k
R1 2K
R5
100k
C2
3.3pF
SEL Q2
Q1 SEL
100k R7
100k
R6
R9
109k
R8
100k
F1
15A
R10 100k
.47
C7
R18 20.0k
C12
.022
.027 C10
150pF C8
C14 22pF
C13 22pF
LAST_MODIFIED=Fri Nov 15 12:16:41 1996
5
+/-
DT
DWELL CONT OHMS
DT
SOURCE
12
11
10
9
8
76
5
4
3
2
1
OFF POSITION
S1 TOP
DWELL,%,RPM
BEEPER
REFERENCE A/D
SIGNAL CONDITIONING CURRENT PROTECTION &
OHMS,CONT
VAC,Hz,VDC
TEMP OHMS
VOLTS
OHMS
HIGH
VOLTAGE & OHMS INPUT PROTECTION
VOLTAGE & OHMS SIGNAL CONDITIONING CONT DT
VDC,VDCHz,%
RPM
TEMP,DT
AMPS (RPM COMMON)
COMMON
RPM
SEE SHEET 1 FOR NOTES
V
4&40M
mV&4V
400k
40V
40k
400V
4k
500V
400
2.5W
WW
2 3
1
4 8
5%
5%
5%
0.5%
5%
5%
12
11
9 6
32
56
20% 1500V
11 10
600V FAST
1.23V
37
74 76
811
11 9
12 75
25%
.25pFM
PP
10%
5
7
6
25V T
T 25V
T
25V
25V T
16V
T
5%
5%
PCPC
5% 1W
5%
0.5%
5%
5%
2W
0.5%
0.5%
1W .25% WW
1
11
66
1312
737475 717778 72808182
94 95 96 98 99
100
85
86
8788
89
91
92
93
97
2
76798384
15 3
VBT+ VSS
VDD
VBT+ COM
VSS
VDD VSS
VBT-
VSSVSS
GUARD
VDD
REFH
GUARD
SHIELD
VSS
COM
VBT+
VSS
zr14f.eps
Figure 5-1. A1 Main PCA (cont)