Keithley 6430 User Manual

SCPI Command Reference 17-75
:POINts <n>
:SOURce[1]:SWEep:POINts <n> Set source-measure points for sweep
Parameters <n> = 1 to 2500 Specify number of source-measure points
MINimum 1
MAXimum 2500
DEFault 2500
Query :POINts? Query number of sweep points
:POINts? DEFault Query *RST default number of sweep points
:POINts? MINimum Query lowest allowable number of sweep
points
:POINts? MAXimum Query highest allowable number of sweep
points
Description The :POINts command specifies the total number of source-measure points
in a sweep. For a linear sweep, the source-measure points are equally spaced
(stepped) between the start level and the stop level. For a log sweep, the
source-measure points are equally spaced on a logarithmic scale. Note that
the start and stop levels are source-measure points.
Step size for a linear sweep can be calculated as follows:
Step Size = (Stop - Start) / (Points - 1)
Step Size = Span / (Points -1)
Step size for a logarithmic sweep can be calculated as follows:
An alternate way to set the source-measure points in a sweep is to specify
the step size using the :STEP command.
Note that the :POINts and :STEP commands are coupled. Changing the
number of source-measure points also changes the step size. Conversely,
changing the step size changes the number of source-measure points.
:DIRection <name>
:SOURce[1]:SWEep:DIRection <name> Set direction of sweep
Parameters <name> = UP Run sweep from start to stop
DOWn Run sweep from stop to start
Query :DIRection? Query direction of sweep
Description Normally, a sweep is run from the start level to the stop level. The :STARt
and :STOP, or :CENTer and :SPAN commands are used to set these levels.
This command lets you change the execution direction of the sweep. With
DOWn selected, the sweep will begin at the stop level and end at the start
level. Selecting UP restores sweep operation to the normal start to stop
direction.
Log Step Size
log 10 (Stop)- log10 (Start)
Points - 1
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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.