![background image](http://html1.mh-extra.com/html/keithley/2303/2303_service-manual_4044894074.webp)
R479
RES, 20K, .1%, .125W, THIN FILM
R-456-20K
R481,R482
RES, 4.99K, .1%, .125W, THIN FILM
R-456-4.99K
R493
RES, 45.3K, 1%, 100MW, THICK FILM
R-418-45.3K
R498
RES, .2, 1%, 1W (2512)
R-441-.2
R500,R501,R502,R507
RES, 18,5%, 1W 200V, THICK FILM
R-437-18
T301
TRANSFORMER
TR-314A
TP301-310,311,314,316-318
CONNECTOR
CS-985
U301,U321
DUAL FET OPAMP
IC-1128
U302,U304,U308,U316,U335
PRECISION BIFET OPAMP
IC-1194
U303
IC, QUAD 2 IN AND, 74HCT08
IC-837
U305,U307
IC, VOLTAGE REGULATOR, LM340-12
IC-60
U306,U311,U322,U330
IC, VOLT COMPARATOR LM393D
IC-775
U310
MICROPOWER VOLTAGE REGULATOR
IC-1152
U312
LOW POWER INSTRUMENT AMP
IC-1124
U313
IC, NEG VOLTAGE REG -15V, 500MA,
79M15
IC-195
U314
HIGH SPEED PWN CONTROLLER
IC-1120
U315
IC, +5V VOLTAGE REGULATOR,
LM2940CT
IC-576
U317
DUAL ±15V ZERO DRIFT OPAMP
IC-1126
U320
IC, POS VOLTAGE REG +15V, 500MA,
78M15
IC-194
U324
IC, CMOS ANAL SWITCH, DG444DY,
IC-866
U327
80V 2.5A FULL BRIDGE FET DRIVER
IC-1139
U329
IC, VOLT. COMPARATOR, LM311M
IC-776
U333
POWER OUTPUT STAGE AUTOMATIC
BIAS
IC-1159
U334,U336
IC, DUAL OP-AMP, LF353M
IC-842
VR303,VR310
DIODE, ZENER, 6.8V, MMSZ5235BT1
DZ-100
VR305,VR312
DIODE, ZENER, MM524694 TI
DZ-113
VR306,VR307
DIODE, ZENER, 6.0V, BZX84B6V2
DZ-87
VR311
DIODE, ZENER
DZ-121
Table 4-6 (continued)
Model 2303B analog board parts list
Circuit designation
Description
Keithley part no.
深圳德标仪器
135-1095-0799
Summary of Contents for 2303
Page 12: ...1 Performance Verification 135 1095 0799...
Page 26: ...2 Calibration 135 1095 0799...
Page 48: ...3 Disassembly 135 1095 0799...
Page 53: ...3 6 Disassembly 135 1095 0799...
Page 76: ...A Specifications 135 1095 0799...
Page 81: ...A 7 Specifications 135 1095 0799...
Page 82: ...B CalibrationReference 135 1095 0799...
Page 90: ...C CalibrationPrograms 135 1095 0799...