Filter
Top Products
HYDRA
Service Manual
2-18
Ω
K16
V LO/RRS LO
R32
10
11
13
14
15
16
19
21
10K
1M
100K
10M
1K
300
Ω
300V
3 K
Ω
300 KΩ
3 MΩ, 10 MΩ
30V
30 K
Ω
30 VDC
300 VDC
23
S2
3 VDC/300 MVDC/TC/
Ω
Z4
DIVIDER
SWITCHING
TO OHMS
SOURCE &
RRS HI
S3
LOW
S16
S42
S19
S18
RRS
LOW
DC HI
RRS HI
RRS LOW
A/D
U8 ANALOG
MEASUREMENT
PROCESSOR*
TO
REFERENCE
RESISTOR
OHMS
VOLTAGE
SOURCE
25
28 29 30 31 32 33 36 37 39 40 41 42
3.84 MHz
TO U9 TO U9
DIGITAL
SECTION
TO U9
* NOT ALL U8 SWITCHES ARE SHOWN HERE.
REFER TO THE SCHEMATIC DIAGRAM IN SECTION 8.
OPEN
THERMOCOUPLE
DETECT
51
52
Z2
C12
1.05V
VR1
VDD
58
57
56
PASSIVE
DC
FILTERS
ACTIVE
FILTER
AMP
60
59
S81
A/D LO
61
RMS
CONVERTER
FREQUENCY
COUNTER
ACTIVE
ACV
FILTER
25678
GAIN CONTROL
AC BUFFER
C31
ACV
K15
REFERENCE
JUNCTION
HI
SOURCE
R10
HI
SENSE
R11
LO
SENSE
LO
SOURCE
R43
K17
R42
Ω LO
R35
R34
+
–
A/D HI
A/D
REF
RRS = REFERENCE RESISTOR SENSE
s3f.eps
Figure 2-3. Analog Simplified Schematic Diagram