Fluke 41B - Keypad

39/41B
Service Manual
2-4
Input Conditioning
Volts Gain
U9, U12
Amps Gain
U18, U13
Volts Input
Amps Input
Latch
Gain
Control
74LVT574
U1
Address Bus
Data Bus
EEPROM
128 Byte
(Serial)
U22
Altera PLD
Glue Logic
U3
Serial
MUX
Misc
Glue
Logic
Shift Register
LTC1092
A/D Converter
U14
LTC1092
A/D Converter
U15
A/D Conversion
Digital Kernel Computer
Optical Interface
Q21, CR6, Q1, Q5, U20
Keypad
15 Keys
EEPOT
Contrast
Control
U8
Display
LCD Module
Controller
Drivers
Display RAM
Backlight
DSP56002
Digital Signal Processor
U2
EEPROM 64Kx8
Boot ROM
U4
EEPROM 32Kx8
Waveform and
Data Storage
U11
SRAM 32Kx8
U7 (D16..23)
SRAM 32Kx8
U6 (D8..15)
SRAM 32Kx8
U5 (D0..7)
Program and Data
(Fluke 41 Only)
(Fluke 41B Only)
Power Supplies
V
DD
V
SS
V
REF
V
CC
–22V V
EE
Power
ON
15 (A0..14) 8 (D16..23) 15 (A0..14) 8 (D0..7) 15 (A0..14) 24 (D0..23)
A08 (D16..23)
24 (D0..23)16 (A0..15)
8 (D16..23)
t1f.eps
Figure 2-1. Overall Functional Block Diagram