Keithley 2430 User Manual

Specifications A-11
Accuracy calculations
The information below discusses how to calculate accuracy for both measurement and source
functions.
Measurement accuracy
Measurement accuracy is calculated as follows:
Accuracy = ±(% of reading + offset)
As an example of how to calculate the actual reading limits, assume that you are measuring
10V on the 20V range. You can compute the reading limit range from one-year measure voltage
accuracy specifications as follows:
Accuracy = ±(% of reading + offset)
±[(0.015% × 10V) + 1mV]
±(1.5mV + 1mV)
±2.5mV
Thus, the actual reading range is: 10V± 2.5mV, or from 9.9975 to 10.0025V
Current measurement calculations are performed in exactly the same manner using the perti-
nent specifications, ranges, and input signal values.
Source accuracy
Source accuracy calculation is similar, except of course that source specifications are used.
As an example of how to calculate the actual source output limits, assume you are sourcing
0.7mA on the 1mA source range. You can compute the reading limit range from source current
one-year accuracy specifications as follows:
Accuracy = ±(0.034% of output + 200nA offset)
±[(0.034% × 0.7mA) + 200nA)]
±(238nA + 200nA)
±438nA
In this case, the actual current output range is: 0.7mA ±438nA, or from 0.69956mA to
0.70044mA.

Keithley 2430 Specifications

General

Type	Source Measure Unit (SMU)
Current Range	0 to 1 A
Digital I/O	Yes
Resolution (Voltage)	100 nV
Resolution (Current)	10 pA
Display	LCD
Interface	GPIB, USB, Ethernet
Voltage Resolution	100 nV
Current Resolution	10 pA
Display Type	LCD

Summary

Warranty Information

Manual Print History

Safety Precautions

Types of Product Users

Defines roles for responsible body, operators, and service personnel.

General Safety Precautions

Essential advice for safe operation and preventing electrical shock.

Performance Verification

Introduction to Performance Verification

Purpose and scope of verification tests for instrument accuracy.

Verification Test Requirements

Conditions and preparations needed for accurate verification tests.

Environmental and Warm-up Conditions

Specifies ambient conditions and instrument warm-up duration.

Recommended Test Equipment

Lists necessary external instruments for performing verification tests.

Restoring Factory Defaults

Resets instrument settings to factory default configuration.

Performing Verification Procedures

Step-by-step guide for conducting all performance verification tests.

Setting Source and Measurement Ranges

Procedures for configuring source and measurement range settings.

Compliance Considerations

Explanation of output clamping behavior and compliance limits.

Output Voltage Accuracy Verification

Method to check the precision of the instrument's voltage output.

Output Current Accuracy Verification

Method to check the precision of the instrument's current output.

Resistance Measurement Accuracy

Procedure to verify the accuracy of resistance measurements.

Calibration Procedures

Introduction to Calibration

Purpose and methods for maintaining instrument accuracy through calibration.

Calibration Cycle and Equipment

Recommended frequency for calibration and required equipment.

Unlocking and Performing Calibration

Steps to enable calibration mode and perform front-panel calibration.

Password Management and Error Handling

Procedures for changing/resetting passwords and understanding errors.

Routine Maintenance

Introduction to Routine Maintenance

Overview of tasks for regular instrument upkeep.

Line Fuse Replacement

Procedure for safely replacing the main power line fuse.

Troubleshooting Guide

Introduction to Troubleshooting

Purpose and scope of the troubleshooting section.

Safety and Repair Considerations

Critical safety advice and important points before making repairs.

Front Panel and Operational Tests

Tests to verify front panel and operational system functionality.

Principles of Operation

Explanations of system components and their functions for diagnosis.

Circuit-Specific Checks

Diagnostic steps for display, power supply, digital, and analog circuits.

Battery Replacement Procedure

Procedure for replacing the internal backup battery.

Instrument Disassembly

Introduction to Disassembly

Overview of handling, cleaning, and instrument disassembly.

Handling Static Sensitive Devices

Precautions for handling components sensitive to electrostatic discharge.

Case Cover and Board Removal

Steps to remove the outer casing and internal circuit boards.

Replaceable Parts Information

Introduction to Parts Lists

Purpose of the replaceable parts section.

Ordering and Service Information

Details on how to order parts and information on factory service.

Instrument Specifications

Accuracy Calculation Methods

How to calculate measurement and source accuracy for the instrument.

Command Reference

Introduction to Command Reference

Overview of the remote calibration commands and error detection methods.

Command Summary

A comprehensive list of available remote commands.

Calibration Programs

Introduction to Calibration Programs

Purpose of the appendix and its BASIC calibration programs.

Hardware and Software Requirements

Necessary computer hardware and software for running calibration programs.

General Program Instructions

Steps for setting up and executing the calibration programs.