Keithley 6430 User Manual

SCPI Command Reference 17-93
Following these general steps to program and use NPLC caching:
1. Send this command to disable auto zero: SYST:AZER OFF.
2. Enable NPLC caching by sending: SYST:AZER:CACH ON.
3. Set up and run your source memory sweep with the :SOUR:MEM com-
mands along with the various other commands required to program
additional operating modes. (See Configure memory sweep as well as
other pertinent command descriptions in this section for details.)
NOTE Auto zero should be disabled with the :SYST:AZER OFF command for maximum
source memory sweep speed; otherwise, the cache is of little use. With auto zero
enabled, new A/D reference and zero values are taken for every reading and saved
into the cache, slowing down sweep operation. However, with auto zero disabled,
measurements may drift and become erroneous. To minimize drift when using NPLC
caching with auto zero disabled, periodically send :SYST:AZER ONCE to force an
immediate auto zero update.
Select power line frequency setting
:LFRequency <freq>
:SYSTem:LFRequency <freq> Select line frequency
Parameters <freq> = 50 50Hz or 400Hz setting
60 60Hz setting
Query :LFRequency? Query line frequency selection.
Description Use this command to manually select the line frequency setting (50 or
60Hz). For 400Hz operation, select 50Hz.
:AUTO <b>
:SYSTem:LFRequency:AUTO <b> Control auto line frequency selection
Parameters <b> = 1 or ON Enable and line frequency selection
0 or OFF Disable auto line frequency selection
Query :AUTO? Query state of auto line frequency selection.
Description This command is used to enable or disable auto line frequency detection.
When enabled, the SourceMeter will sense the line frequency on power-up
and select the appropriate line frequency setting.
Manually setting the line frequency disables auto frequency. See the previ-
ous command.

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.