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Keithley 236 Service Manual
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Table
39,
Digital
Circuitry
Checks
SECTION
3
Maintenance
Pass
RAM,
EPROM,
DPRAM
and
NVRAM
tests
on
power
up.
HL
level
pulse
every
imsec
Switch
data
(+5V
or
0V)
Rotary
knob
data
(+5V
or
0V)
Variable
pulse
train
(0V
to
+5V)
2MHz
HL
+5V,
±5%
+5V
signal
pulsed
0V
to
+5V
every
imsec
+5V
(Logic
“1“)
2MHz
squarewave
(0V
to
+5V)
Goes
true
(+0V)
when
com
mand
is
sent
See
Figure
37
for
required
con
ditions
Variable
pulse
train
(0V
to
+5V)
Variable
pulse
train
(0V
to
+5V)
2MHz
TTL
+5V,
±5%
I/o
controller
VIA
display
clock
Data
input
to
VIA
when
button
pressed
Data
input
VIA
when
rotary
knob
turned.
Data
output
to
display.
Bus
clock
Reset
line
(goes
bw
momentarily
on
power
up)
INT
line
RESET
line
Clock
ATN
line
Handshake
sequence
S/M
controller
VIA
data
to
optos.
Data
to
VIA
from
A/D
Clock
Reset
line
(goes
bw
momentarily
on
power
up)
Step
ItemlComponent
Required
Condition
Remarks
Display
will
lock
if
failure
occurs.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
U12,
U13,
U17
U30,
U31
and
U33
U28,pinl8
U28,
pin
6
(PA4),
pin
7
(PA5),
pin
8
(PA6),
pin
9
(PA7)
U28,
pin
11
(PB1),
pin
12
(PB2)
U28,
pin
19
U25,
plus
34
and
35
U25,
pin
37
U27,
pin
9
U27,
pin
19
U27,
pin
18
U27,
pin
28
U27,
pin
24
(NDAC),
25
(NRFD,
26
(DAV),
and
data
lines
U14,pinl9
U14,
pins
29
(PA0PA7)
U15,
pins
34
and
35
U15,pin37
3-17
87
89
Table of Contents
Table of Contents
21
Performance Verification
27
Introduction
27
Environmental Conditions
27
Initial Cond1Tions
27
Required Test Equtpment
28
Verifications Procedures
28
Equipment Characterization
30
Table 1-3 Model 263 I-Source Characteristics
31
Common Mode Verification
32
Figure 1-2 Setup for Common Mode Verification
33
Voltage Source Verification
34
Figure 1-3 Setup for Voltage Source Ranges Verification
35
Voltage Measure Verification
35
Figure 1-4. Setupfor Voltagemeasure Ranges Verification
36
Table 1-5 Voltage Measure Verification
37
Remote Sense Verification
37
Figure 1-5 Setup for Remote Sense Verification
38
Low Current (Ina to Loma) Measure Ranges Verification
38
Low Current (Ina to Loma) Source Ranges Verification
43
Looma Measure Range Verification
44
Figure 1-8 Setup for Looma Measure Range Verification
45
Looma Source Range Verification
46
Calibration
49
Introduction
49
Recommended Calibration Equipment
49
Environmental Conditions
50
Warmup Period
50
Cal Lock
50
Calibration Procedures
50
Equipment Characterization
51
Figure 2-2 Setup for Equipment Characterization
52
Table 2-3 Model 263 I-Source Characterization
53
Voltage Calibration
54
Figure 2-3 Setup for Volts Calibration
55
Looma Range Calibration
57
Low Current Ranges Calibration (Ina Loma)
59
Calibration Errors
61
Table 2-4 Calibration Error Messages
62
Calibration Program
64
Table 3-1 Line Fuse Selection
73
Introduction
73
Line Fuse Replacement
73
Fan Filter Cleaning
73
Handling and Cleaning Precautions
76
Disassembly Instructions
76
Figure 3-3 Resonant Converter Board (Model 237)
77
Figure 3-4 Output Board
78
Figure 3-5 Analog Board (Shields Removed)
79
Diagnostics
82
Table 3-2 Recommended Troubleshooting Equipment
82
Special Handling of Static Sensitive Devices
82
Recommended Test Equipment
82
Power Supply Checks
84
Table 3-3 Power Supply Checks
84
Analog Switching
85
Table 3-4 Analog Switching; Current Ranging
85
Table 3-5 Analog Switching; Volts Ranging
86
Table 3-6 Analog Switching; Feedback
86
Digital and Display Checks
87
Table 3-9 Digital Circuitry Checks
88
Table 3-10 Display Circuitry Checks
89
Principles of Operation
90
Introduction
90
Analog Circuitry
91
V/I Control and Readback
91
Output Stage
93
Figure 4-3 Model 236 Output Stage (Simplified Schematic Diagram)
94
Feedback
95
Figure 4-6 Damping Relay Contact Bounce
96
Resonant Converter (Model 237)
97
A/D Converter
97
Table 4-1 Volts Range Relays
97
Digital Circuttry
98
I/O Controller
98
Source/Measure Controller
99
Communications
99
A Display Circuitry
99
Powersupply
100
Introduction
102
Parts Lists
102
Ordering Information
102
Schematic Diagrams and Component Location Drawings
102
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Keithley 236 Specifications
General
Brand
Keithley
Model
236
Category
Measuring Instruments
Language
English
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