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Keithley 236 Service Manual

Keithley 236
138 pages
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SECTION
2
Calibration
1.
Program
the
Model
236/237
to
generate
an
SRQ
on
4.
After
displaying
the
Ui
error status
word,
send
the
an error
by
sending
the
M32
command
over the
bus.
U7
command
and
address
the
Mode1236/237
to
talk.
2.
When
an
SRQ
occurs
(error),
send
the
Ui
command
5.
Display
the
character
string
(U7
Calibration
Status
and
then
address
the
Model
236/237
to
talk.
Word)
on
the
Computer
CRT
and
refer
to
Figure
27
3.
Display the
charaCter
string
(U
Error
Status
Word)
to
determine
whiCh
Calibration
step
failed.
This
from
the Model
236/237
on
the
Computer
CRT
and
status
word
also
provides
the
status
of
the
CAL
refer
to
Figure
26
to
determine
the
type
of
error.
LOCK
switch.
Identifier
ERSbbb..bbb<TERM÷EOI>
Most
Significant
Bit
J
L
Least
Significant
Bit
I1
26Bit
ASCII
String
0
=
No
Error
1
=
Error
Most
Significant
Bit
Trigger
Overrun
IDDC
IDDCO
Interlock
Present
Illegal
Measure
Range
Illegal
Source Range
Invalid
Sweep
Mix
Log
Cannot
Cross
Zero
Autoranging
Source
with
Pulse
Sweep
In
Calibration
In
Standby
Unitisa236
DU
DPRAM
Failed
IOU
EEROM
Failed
IOU
Cal
Checksum
Error
DPRAM
Lockup
DPRAM
Link
Error
Cal
ADC
Zero
Error
Cal
ADC
Gain
Error
Cal
SRC
Zero
Error
Cal
SRC
Gain
Error
Cal
Common
Mode
Error
Cal
Compliance
Eror
Cal
Value
Error
Cal
Constants
Error
Least
Significant
Bit
Cal
Invalid
Error
Figure
2-6.
lii
Error
Status
Word
2-15

Table of Contents

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Keithley 236 Specifications

General IconGeneral
Voltage Source Range±100V
Current Source Range±100 mA
Voltage Measure Range±100V
Current Measure Range±100 mA
Voltage Range±100V
Current Range±100 mA
TypeSource Measure Unit (SMU)
Compliance LimitProgrammable
InterfaceIEEE-488
Resolution5.5 digits
Operating ModesVoltage source, Current source, Voltage measure, Current measure

Summary

Warranty Information

Warranty Limitations

Manufacturer/Importer Certificate

Safety Precautions

Command Summary and Controls

Local Operation and Source Group

Controls for local mode, operation, source measure, and function selection.

Measure, Sweep, and Compliance Controls

Controls for measurement parameters, sweep definition, and compliance settings.

Trigger and Data Entry Controls

Controls for triggering setup, manual trigger, and data entry methods.

Typical Connections and Equivalent Circuits

Local Sense Connections

Diagram showing local sensing connections with Model 8006 test fixture.

Remote Sense Connections

Diagram showing remote sensing connections with Model 8006 test fixture.

Equivalent Circuits

Schematic representations of equivalent circuits for measurement.

Instrument Specifications

General Specifications

Covers unit functions, cycles, ranging, filter, suppress, menu, data entry, trigger.

Voltage and Current Specifications

Detailed accuracy and range specifications for voltage and current source/measure.

Section 1: Performance Verification

Introduction and Setup

Overview of verification, environmental, initial conditions, and warm-up procedures.

Test Equipment and Procedures

Lists recommended equipment and outlines verification procedures.

Specific Verification Procedures

Detailed steps for equipment, common mode, voltage, remote sense, low current, and 100mA verification.

Section 2: Calibration

Introduction to Calibration

Overview of calibration procedures, frequency, and requirements.

Recommended Calibration Equipment

Lists essential equipment required for calibrating the instrument.

Calibration Setup Conditions

Conditions including environmental, warm-up, and CAL LOCK switch.

Calibration Procedures Overview

Introduces the step-by-step procedures for calibrating the Model 236/237.

Equipment Characterization for Calibration

Characterizes the Model 263 source for calibrating Model 236/237 ranges.

Voltage Calibration

Procedure to calibrate voltage source and measure ranges.

Low Current Ranges Calibration (1nA to 10mA)

Calibrates low current ranges from 1nA to 10mA using Model 263.

Calibration Error Status Words

Explains UI Error Status Word and U7 Calibration Status Word.

Calibration Program

Information on using the provided BASIC program for calibration.

Section 3: Maintenance

Introduction and Fuse Replacement

Overview of maintenance and procedure for replacing the power line fuse.

Fan Filter and Battery Maintenance

Procedures for cleaning the fan filter and replacing the backup battery.

Handling, Cleaning, and Disassembly

Guidelines for handling PC boards, cleaning, and disassembling the instrument.

Static Handling, Troubleshooting, and Test Equipment

Precautions for static devices, troubleshooting overview, and recommended test equipment.

Diagnostics, Power Supply, and Display Checks

Details diagnostics, power supply checks, and display/A/D test modes.

Analog Control Lines and Switching Operations

Describes analog control lines, switching states for current, voltage, feedback, and sensing.

Section 4: Principles of Operation

Introduction and Block Diagram

General functional description of the Model 236/237, including a simplified block diagram.

Analog Circuitry and V/I Control

Explains the error amplifier, bootstrap amplifier, DACs, and V/I control circuitry.

Output Stage and V/I Feedback

Describes output stages, bias control, V/I feedback, and contact bounce damping.

Resonant Converter and A/D Converter

Explains the Model 237 resonant converter and the analog-to-digital converter.

Digital Circuitry and Controllers

Covers digital circuitry, I/O controller, source/measure controller, communications, and display.

Power Supply Description

Details the instrument's power supply design, including AC input and voltage outputs.

Section 5: Replaceable Parts

Replaceable Parts Information and Ordering

Covers introduction, parts lists, ordering, factory service, and schematics.

Display Board Parts List

List of components and Keithley part numbers for the display board.

Digital Board Parts List

List of components and Keithley part numbers for the digital board.

Analog Board Parts List

List of components and Keithley part numbers for the analog board.

Model 236 Output Module Parts List

List of components and Keithley part numbers for the Model 236 output module.

Model 237 Output Module Parts List

List of components and Keithley part numbers for the Model 237 output module.

Model 237 Resonant Converter Parts List

List of components and Keithley part numbers for the Model 237 resonant converter.

Miscellaneous Parts List

List of miscellaneous parts not specific to any particular PC board.

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