Fluke 7 Series Service Manual page 15

12B/18/7 Series
Service Manual
Analog Measurement IC
Microcomputer IC
Input Divider and Ohms Reference Resistor Network
Input Divider AC Coupling Capacitor
J2 Input Receptacle Voltage Sense Resistor
J1 Input Receptacle Voltage Sense Resistor
Reference Voltage for Volts Measurements
A/D Converter Integrate Capacitor
A/D Converter Autozero Capacitor
A/D Converter Gain Resistors
Active Filter Components
Passive Filter Components
AC to DC Converter Gain Resistors
AC to DC Converter AC Coupling Capacitor
Bias Current Setting Resistor
DGND-VSS Voltage Setting Resistors
Power Supply Bypass Capacitors
Reverse Battery Protection
System Clock
Automatic Selection Input Current Limiters
Automatic Selection Input Positive Temp. Coef. Thermistor
Automatic Selection Input Voltage Clamp Circuit
Automatic Selection Input Fusible Resistor
Microcomputer Reset Circuit
On/Off and Automatic Selection Select Slide Switch
Beeper
Beeper Current Limiter
Slide Switch Protection
Switch Sense Bypass Capacitor
Input Divider Bypass Capacitor
Zero Ohm Jumpers
2-2
Table 2-1. Electrical Components on Main PCA
Circuit and Function Component Designator(s)
U1
U2
Z1
C14
R17
R14
VR1, R4, R5, R6, R26
C2
C1
R1, R3, R15
R7, R8, C5, C6
R9, C7
R11, R12, R13
C8
R2
R10, R24
C3, C15
CR1
Y1
R16, R18, R29
RT1
Q1, Q2, CR2, R28
R19
R23, R25, C10, C13, CR3
S1
LS1
R22
E1
C9
C16
R20, R21, R27