Omega 871A User Manual page 20

5.1 PARTS LIST (continued)
Circuit Description
Desig.
R116** R116, R122, and U109 are a
selected set
R117 Thick Film Resistor Network
R118* Resistor, 150 kΩ, 5%, 1/4W,
Comp
R118** Resistor, 5.6 kΩ, 5%, 1/4W,
Comp
R119 Thick Film Resistor Network
R120 Resistor, 10 kΩ, 5%, 1/4W,
Comp
R121** Resistor, 10.0 kΩ, 6.1%, Metal
Film
R122*† Resistor , Selected, 5%, 1/4W,
Comp
R122** R116, R122, and U109 are a
selected set
R123* Resistor, 324 kΩ, 1%, 1/8W, Mtf.
R123** Resistor, 316 kΩ, 1%, 1/8W, Mtf.
Resistor, 10.0 Ω, 0.1%, Metal
R124**
film
R126* Resistor, 10 kΩ, 0.1%, MF
R127* Resistor, 9.9 kΩ, 0.1%, MF
R128* Resistor, 4.7 kΩ, 5%, 1/4 W,
Comp
S101 Switch, Rotary
S102 Switch, Rotary
S103 Switch, SPDT, ON-OFF
TC-1, 2 TC Cable
R127
Jumper
R121
Jumper
R124
COMPONENT LAYOUT FOR MODEL 871A
R120
COMPONENT LAYOUT FOR MODEL 872A
R118A
Circuit
Desig.
U101
U102
U103, U104*
U103, U104**
U105
U106
U107
U108
U109*
U109**
U110*
U110**
U111
U112
U113
U114
Y101
† Value selected during calibration at factory.
* For Model 871A only
** For Model 872A only
To order parts, specify model and circuit designation.
17
Description
1
3 ⁄ 2 Digit Single Chip A/D
Converter
Dual Synchronous Up Counter
Low Power JFET Input Op Amp
Dual JFET Input Op Amp
COS/MOS Quad Bilateral Switch
CMOS Quad Exclusive OR Gate
Dual "D" Type Flip-Flop
14 Stage Binary Counter
Linear Op Amp
R116, R222, and U109 are a
selected set
Current Source
R115 and U110 are a
selected set
Quad, 2 Input NOR Gate
COS/MOS Divide by "N"
Counter
Quad, 2 Input, AND Gate
Analog Multiplexer
Resonator, 360 kHz