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Keithley 236 Service Manual
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IEEE-488
BUS
IMPLEMENTATION
MULTILINE
COMMANDS:
DCL,
LLO,
SDC,
GET,
GTL,
UNT,
UNL,
SPE,
SPD.
UNILINE
COMMANDS:
IFC,
REN,
EOI,
SRQ
ATN.
INTERFACE
FUNCTIONS:
SHI,
AHI,
T6,
TEO,
L4,
LEO,
SRI,
RLI,
PPo,
DC1,
DT1,
CO,
El.
All
front
panel
functions
and
setups
are
available
over
the
IEE&488
bus,
in
addition
to
Status,
Service
Request,
Output
Format,
EOI,
Trigger,
and
Terminator.
1EEE488
address
is
set
from
front
panel
menu.
EXECUTION
SPEED
MINIMUM
SOURCE-DELAY-MEASURE
CYCLE
TIME:
lmsec.
RESPONSE
TO
IEEE-488
COMMAND
(as
a
source):
25msec.
MEASUREMENT
RATE:
lmsec.
per
point
into
internal
buffer.
CONTINUOUS
MEASUREMENT
SPEED
(source
DC
value
over
IEEE.488
bus):
110
readings
per
second.
TRIGGER
LATENCY
TIME:
<2msec.
GENERAL
LOAD
CAPACITANCE:
Stable
into
20,000pF
typical.
REMOTE
SENSE:
Corrects
for
up
to
2V
drop
in
each
output
lead.
Maximum
lk2
per
sense
lead
for
rated
accuracy.
Residual
output
resistance
(as
a
voltage
source)
is
O.52.
GUARD:
Output
Resistance:
l2k2.
Maximum
Output
Current:
±2mA.
Offset
Relative
to
Output
HI:
±2mV
max.
ISOLATION
(Output
LO
to
chassis):
Typically
>10b02
in
parallel
with
500pF.
MAXIMUM
COMMON
MODE
VOLTAGE:
200V.
CONNECTORS:
Outputs:
3-lug
triax.
Trigger
Input/Output:
BNC.
Interlock:
3-pin
miniature
DIN.
TEMPERATURE
COEFFICIENT
(O°-18°C
&
28°-50°C):
±(0.l
x
applicable
accuracy
specification)/°C.
ENVIRONMENT:
Operating:
0°—50°C,
70%
relative
humidity
up
to
35°C.
Linearly
derate
3%
RH/°C,
35°—50°C.
Storage:
—25°
to
65°C.
WARM-UP:
One
hour
to
rated
accuracy.
COOLING:
Internal
fan
forced
air
cooling.
POWER:
105—125
or
210—250V
AC
(external
switch
selectable),
90—
110V
and
180—220V
version
available.
100VA
max.
DIMENSIONS,
WEIGHT:
89mm
high
x435mmwide
x448mm
deep
(3.5
in.
x
17.125
in.
x
17.625
in.).
Net
weight
9kg
(19.75
lbs.).
ACCESSORIES
SUPPLIED:
Model
7078-TRX-3:
Triax
to
Triax
Cable,
0.9m
(3
ft.)
Model
236-ILC-3:
Interlock
Cable
ACCESSORIES
AVAILABLE:
Model
8000-10:
Model
8000-14:
Equipment
Rack
for
3
SMUs
(10
in.)
Equipment
Rack
for
4
SMUs
(14
in.)
19
21
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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