Keithley 6430 User Manual

SCPI Command Reference 17-47
VOLTage — This element provides the voltage measurement or the pro-
grammed voltage source reading. If sourcing voltage and measuring volt-
age, this element will provide the voltage measurement (measure reading
takes priority over source reading). If voltage is not sourced or measured,
the NAN (not a number) value of +9.91e37 is used.
CURRent — This element provides the current measurement or the pro-
grammed current source reading. If sourcing current and measuring current,
this element will provide the current measurement (measure reading takes
priority over source reading). If current is not sourced or measured, the
NAN (not a number) value of +9.91e37 is used.
RESistance — This element provides the resistance measurement. If resis-
tance is not measured, the NAN (not a number) value of +9.91e37 is used.
TIME — A timestamp is available to reference each group of readings to a
point in time. The relative timestamp operates as a timer that starts at zero
seconds when the instrument is turned on or when the relative timestamp is
reset (:SYSTem:TIME:RESet). The timestamp for each reading sent over
the bus is referenced, in seconds, to the start time. After 99,999.999 seconds,
the timer resets back to zero and starts over.
Timestamp is also available for buffer readings. Timestamp can be refer-
enced to the first reading stored in the buffer (absolute format) which is
timestamped at 0 seconds, or can provide the time between each reading
(delta format). The :TRACe:TSTamp:FORMat command is used to select
the absolute or delta format.
NOTE Timestamp values are approximate. See Section 8 for details.
STATus — A status word is available to provide status information con-
cerning SourceMeter operation. The 24-bit status word is sent in a decimal
form and has to be converted by the user to the binary equivalent to deter-
mine the state of each bit in the word. For example, if the status value is 65,
the binary equivalent is 0000000000001000001. Bits 0 and 6 are set.
The significance of each status bit is explained as follows:
Bit 0 (OFLO) — Set to 1 if measurement was made while in over-range.
Bit 1 (Filter) — Set to 1 if measurement was made with the filter enabled.
Bit 2 — Not used.
Bit 3 (Compliance) — Set to 1 if in “real” compliance.
Bit 4 (OVP) — Set to 1 if the over voltage protection limit was reached.
Bit 5 (Math) — Set to 1 if math expression (calc1) is enabled.
Bit 6 (Null) — Set to 1 if Null is enabled.
Bit 7 (Limits) — Set to 1 if a limit test (calc2) is enabled.
Bits 8 and 9 (Limit Results) — Provides limit test results. See grading and
sorting modes in the following paragraph, Limit test bits.
Bit 10 (Auto-ohms) — Set to 1 if auto-ohms enabled.
Bit 11 (V-Meas) — Set to 1 if V-Measure is enabled.
Bit 12 (I-Meas) — Set to 1 if I-Measure is enabled.

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.