Keithley 6430 User Manual

5-28 Source-Measure Concepts
Buffer considerations
When the SourceMeter is in the process of storing readings, configuration changes affect
what gets stored in the buffer. These storage considerations and restrictions are summarized in
Table 5-3.
The first column of Table 5-3 shows the SourceMeter configuration when the storage pro-
cess is started. The next three columns show what happens when configuration changes are
made while the SourceMeter is storing readings.
Changing V, I, or Ω measurement function
• If you started with only a basic measurement function selected, the buffer will track a
basic measurement function change. For example, if you started in volts and changed to
current, the buffer will store the current readings.
• If you started with MATH, REL, and/or LIMITS enabled, the buffer will stop storing
readings if you change the basic measurement function. Storage will continue if you
return to the original configuration.
See Section 3, Basic source-measure procedure, for more information on selecting the mea-
surement function.
Table 5-3
Buffer considerations
Configuration at start
of the storage process
What happens if
the basic measure-
ment function (V, I,
or W) is changed
What happens if
the MATH func-
tion is changed
What happens if
REL or LIMITS is
changed
Measure V, I, or Ω
MATH (FCTN) enabled
REL/LIMITS enabled
Buffer tracks
Buffer pauses
Buffer pauses
V, I, or Ω stored
MATH not stored
OK
Buffer pauses
V, I, or Ω stored REL
or Limits not stored
MATH stored REL or
Limits not stored
OK

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.