Keithley 6430 User Manual

7-6 Relative and Math
Percent deviation
This calculation provides the percent deviation between the normal display reading and the
user set reference value:
where: X is the normal display measurement reading (V, I, or Ω).
Y is the reference value.
When prompted to enter the reference value (Y), you can enter the value or have the
SourceMeter acquire the reference value. To acquire the reference value, turn on the output and
press AUTO. The SourceMeter will perform a measurement and display that reading as the ref-
erence.
Limit Testing — After the reference value is entered, you will be prompted to enter high and
low tolerances (in %) for the reference value. These tolerances set the high and low limits for
Limit 2 test.
For example, perform the following steps to test 1kΩ, 1% resistors:
1. Select the Ω function, select the 1kΩ measurement range (or use AUTO range), and
connect the resistor to be tested to the SourceMeter.
2. Configure the percent deviation math function:
a. Press CONFIG, press FCTN, then select %DEV.
b. Set the reference (REF) value to +1.000000 k, then press ENTER.
c. Set the high tolerance (HI TOL) to 01.00%, then press ENTER.
d. Set the low tolerance (LO TOL) to 01.00%, then press ENTER.
3. Turn the output on. The measured reading of the resistor is displayed.
4. Press FCTN to select the percent deviation math function. The actual tolerance of the
resistor will be displayed along with the result of the limit test. If the resistor reading is
within ±1% of 1kΩ, the “PASS” test message is displayed. If outside the 1% tolerance,
the “FAIL” message is displayed.
5. When finished, turn the ouput off.
NOTE The reading format is fixed at ±XXX.XXX%
NOTE Limit testing can be disabled by pressing the LIMIT key.
%Deviation
X Y–( )
Y
-------------------
100×=

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.