Figure 4-3 Analog Circuitry Block Diagram - Keithley 2701 Service Manual

Model 2701 Service Manual
Figure 4-3
Analog circuitry block diagram
Front Terminals
S101
AMPS
Scanner Outputs
Front Terminals
S101
INPUT
Scanner Outputs
HI
DCV
Divider
R117, Q109,
Q114, Q136
Front Terminals
S101
SENSE
Scanner Outputs
HI
Front Terminals
S101
SENSE
Scanner Outputs
LO
Scanner Outputs
Scanner
Inputs
Scanner
Inputs
Current
DCA
Shunts
K103, R158, ACA
R205, R338
AC Switching
&
Gain
K102, U102, U103, U105,
U112, U118, U111, U110
ACV,
K101
FREQ
SSP* DCV
Q101, Q102
OHMS
Q120, CR114
DCV/100
Ohms I-Source
Q119, Q123,
Q124, Q125, Q126,
U123, U133
Protection
R120, R121, R124,
R125, Q107, Q148,
VR119, VR120
Protection
R132, R139, R148,
R163, Q122, Q135,
VR119, VR120
Slot
Control
Slot 1
Slot 2
DCV & Ohms
X1
Switching
Buffer
Q104, Q105
U113 BUFCOM
Q108, Q113
Troubleshooting 4-11
A/D
Digital
MUX & ADC
Circuitry
Gain
(See
U129, U132 U165
Figure 4-2)
U163, U166
X1
Buffer
U167
* Solid State Protection