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Instruction Manual
Model 180
Digital Nanovoltmeter
INSTRUCTION MANUAL
MODEL 180
DIGITAL NANOVOLTMETER
(AND MODEL 1802 DIGITAL OUTPUT)
Keithley Instruments, Inc.
Cleveland, Ohio, U.S.A.
INSTRUCTION MANUAL
Model 180
Digital Nanovol tmeter
OCOPYRIGHT 1975, KEITHLEY INSTRUMENTS, INC.
SIXTH PRINTING. JULY 1977, CLEVELAND, OHIO, U.S.A.
DOCUMENT NO. 28038
CONTENTS
5. circuit Description 16
5-l. G6Z"SX.d II
5-2. Analog section 17
5-3. Digital Section 21
5-4. Power Supply section 26
6. Replaceable Parts 27
6-1, Replaceable Parts List 27
6-2. Electrical Schematics and magrams 27
h-3. HO" to "se the Parts List 27
6-4. How to order Parts 27
6-5. Code-to-&me list 65
7. Calibration 58
7-l. General 58
7-2. Required Test Equipment 58
7-3. Adjustment b Calibration 58
8. Schematic Diagrams 75
25548E, Mother Board, PC-271 75
25054D, Power supply, PC-272 17
24543D, Input section, PC-278, PC-279 78
25111~0, AC Amplifier, PC-282 79
251121), Chopper Drive, PC-273 80
251170, Isolator Board, PC-274 81
2502411, Ranging Board, PC-280 82
25100D, Relay Board, PC-281 83
250981), Clack Board, PC-300 84
25017", Integrator Board, PC-301 85
248730, Tube Baard, PC-299 86
248660, Digital output, PC-275 87
MODEL 180
ILLUSTRATIONS
1
2
3
4
5
6
,a
7b
7c
8a
8b (b)
EC (cl
Ed Cd)
8e
8f
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
31
38
39
40
41
42
43
44a
44b
45
0674
SPECIFICATIONS MODEL 180
SPECIFICATIONS
RANGE: 10 nanovolts per digit (100.00 pV full scale) to l-volt full ISOLATION: Input Lo to a",,~ Lo 9reattir than ,W ohms (10'" a,
scale in 5 decade ranges. loo% o"erranging on a,, ranges. 25