Keithley 6430 User Manual

9-4 Sweep Operation
Thus, the five log steps for this sweep are 0, 0.25, 0.50, 0.75, and 1.00. The actual V-Source
levels at these points are listed in Table 9-1 (the V-Source level is the anti-log of the log step).
When this sweep is triggered to start, the output will go from the bias level to the start source
level (1V) and sweep through the symmetrical log points. With trigger delay set to zero, the
time duration at each step is determined by the source delay and the time it takes to perform the
measurement (NPLC setting).
Custom sweep
This sweep type lets you configure a customized sweep. Programmable parameters include
the number of measurement points in the sweep and the source level at each point.
When this sweep is started, the output goes from the bias level to the first source-measure
point in the sweep. The sweep will continue through the source-measure points in the order
they were programmed and stop after the last source-measure point. With trigger delay set to
zero, the time duration at each step is determined by the source delay and the time it takes to
perform the measurement (NPLC setting). This delay is the same for all sweep points.
Custom sweep examples
The custom sweep can be configured to provide a 50% duty cycle pulse sweep. Figure 9-3
shows a pulse sweep that provides three 1V pulses on a 0V bias level. This pulse sweep is con-
figured by specifying six points for the custom sweep. The specified voltage levels at points P0,
P2, and P4 are 1V, and the specified voltage levels at points P1, P3, and P5 are 0V. Six measure-
ments are performed for this sweep, three at 1V and three at 0V.
Table 9-1
Logarithmic sweep points
Measure point Log step V-Source level (volts)
Point 1
Point 2
Point 3
Point 4
Point 5
0
0.25
0.50
0.75
1.0
1
1.7783
3.1623
5.6234
10
Delay
P1
Measure
#1
P0
Measure
#2
Delay
Delay
P3
Measure
#3
P2
Measure
#4
Delay
Delay
P5
Measure
#5
P4
Measure
#6
Delay
Bias 0V
1V
Bias
F
igure 9-3
C
ustom pulse
sweep

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.