Keithley 6430 User Manual

11-2 Limit Testing
Types of limits
As shown in Figure 11-1, there are 11 limit tests that can be performed on a DUT.
• Limit 1: compliance test
• Limit 2: course limits
• Limits 3, 5-12: fine limits
A test is only performed if it is enabled. Thus, you can perform one, two, or all 11 tests. The
tests are always performed in the order shown in the drawing.
Pass/fail information
Pass/fail information for limit tests can be obtained as follows:
• A “PASS” or “FAIL” indication on the front panel display.
• By programming the unit to output specific pass/fail bit patterns on the Digital I/O port,
which can be used to control other equipment such as a device handler for binning oper-
ations. See Binning systems later in this section and Section 12, Digital I/O port, for
more information.
• With the :CALCulate2:LIMit<n>:FAIL? query via remote, where <n> is the limit test
number (Section 17, CALCulate 2).
• By reading various status bits (Section 14, Status structure, and Section 17, FORMat
subsystem.)
• By noting a “P” or “F” preceding buffer location numbers (Section 8, Buffer location
number).
Pass
Limit
LO
Fail Fail
Limit
HI
Pass or Fail on Compliance
Pass
Limit
LO
Fail
Fail
Limit
HI
Limit 1 Test
(Compliance)
Limit 2 Test
(Coarse Limits)
Limit 3, 5-12 Tests
(Fine Limits)
Figure 11-1
Limits tests

Keithley 6430 Specifications

General

Type	Sub-Femtoamp Remote SourceMeter
Compliance Voltage	200 V
Maximum Output Voltage	200 V
Maximum Output Current	100 mA
Compliance Limit	Programmable
Interface	GPIB, RS-232
Input Impedance	>10^14 Ω

Summary

Safety Precautions

3 Basic Source-Measure Operation

Basic Source-Measure Procedure

Details setup for source-measure operations: function, values, limits, and output control.

5 Source-Measure Concepts

Compliance limit

Discusses compliance limits, values, and determination.

Operating boundaries

Covers voltage/current boundaries for source, sink, I-source, V-source, and source-measure modes.

6 Range, Digits, Speed, and Filters

Range and digits

Discusses available ranges, limits, manual/autoranging, and display resolution.

Speed

Filters

Provides information on 3-stage filtering to reduce reading noise.

7 Relative and Math

Math Operations

Details math (FCTN) operations: power, offset ohms, varistor, etc.

9 Sweep Operation

Configuring and Running a Sweep

Discusses setup, configuration, delay setting, and performing sweeps.

10 Triggering

Trigger Model

Discusses trigger model, layers, event detection, delay, and device action.

Configuring Triggering

Details how to configure various triggering aspects.

Remote Triggering

Details remote trigger model, commands, and basic triggering example.

11 Limit Testing

Types of Limits

Discusses three limit types: compliance, coarse, fine; summarizes grading and sorting modes.

Configuring and Performing Limit Tests

Describes configuration for limit tests and typical test procedure.

Remote Limit Testing

12 Digital I/O Port, Interlock, and Output Configuration

Digital I/O Port

Safety Interlock

Describes using Digital I/O Port as a safety interlock.

Front Panel Output Configuration

14 Status Structure

Programming and Reading Registers

Status Byte and Service Request (SRQ)

Explains programming Status Byte for SRQs and using serial poll to detect SRQs.

15 Common Commands

Command Summary

Lists IEEE-488.2 common commands used by the SourceMeter.

Command Reference

Provides detailed reference for common commands, excluding status structure.

16 SCPI Signal-Oriented Measurement Commands

Command Summary

Configuring Measurement Function

Provides detailed info on commands to configure measurement function.

Acquiring Readings

Describes commands to acquire post-processed readings, trigger, acquire, and single measurement.

17 SCPI Command Reference

18 Performance Verification

Verification Test Requirements

Recommended Test Equipment

Performing the Verification Test Procedures

Details restoring factory defaults, setting ranges, and output values.

Mainframe Verification

Covers procedures to verify mainframe accuracy alone.

19 Calibration

Recommended Calibration Equipment

Unlocking Calibration

Mainframe Calibration

Includes procedures to calibrate the mainframe without the Remote PreAmp.

20 Routine Maintenance

Line Fuse Replacement

Covers procedure and part numbers for replacing the line fuse.

Front Panel Tests

F Measurement Considerations

Floating measurement safety concerns

Discusses safety concerns for measurements up to 42V above chassis ground.

Low current measurements

Leakage currents and guarding

Explains reducing leakage currents using insulators, humidity control, and guarding.