Keithley 2400 Service Manual

B-10 Command Reference
Error 508 Will occur when a :CAL:PROT:SENS command generates an invalid
measurement gain calibration constant.
Table B-4
Calibration errors
Error number Error message
+500 “Date of calibration not set”
+501 “Next date of calibration not set”
+502 “Calibration data invalid”
+503 “DAC calibration overflow”
+504 “DAC calibration underflow”
+505 “Source offset data invalid”
+506 “Source gain data invalid”
+507 “Measurement offset data invalid”
+508 “Measurement gain data invalid”
Status byte EAV (Error Available) bit
Whenever an error is available in the error queue, the EAV (Error Available) bit (bit 2) of the
status byte will be set. Use the *STB? query to obtain the status byte, then test bit 2 to see if it
is set. If the EAV bit is set, an error has occurred, and you can use the appropriate error query to
read the error and at the same time clear the EAV bit in the status byte.
Generating an SRQ on error
To program the instrument to generate an IEEE-488 bus SRQ (Service Request) when an error
occurs, send the *SRE 4 command. This command will enable SRQ when the EAV bit is set.
You can then read the status byte and error queue as outlined above to check for errors and to
determine the exact nature of the error.

Keithley 2400 Specifications

General

Model	2400
Category	SourceMeter
Voltage Source Range	±200 V
Power Output	20 W
Voltage Measurement Resolution	100 nV
Current Measurement Resolution	10 pA
Resolution	5.5 digits
Interfaces	GPIB, RS-232
Current Source Range	±1A
Current Measurement Range	±1A
Resistance Measurement Range	2 Ω to 200 MΩ
Display	Vacuum Fluorescent Display

Summary

Warranty

Manual Print History

Safety Precautions

Performance Verification

Introduction

Explains the purpose and conditions for verifying performance.

Recommended test equipment

Lists required verification equipment with specifications.

Performing the verification test procedures

Details the steps for executing verification tests.

Test summary

Lists the types of accuracy tests performed.

Calibration

Introduction

Explains calibration procedures and requirements.

Calibration considerations

Provides important notes for performing calibration.

Unlocking calibration

Details how to unlock the calibration function.

Changing the password

Explains how to change the calibration password.

Viewing calibration dates and calibration count

Explains how to view calibration history.

Calibration errors

Discusses potential calibration errors and messages.

Front panel calibration

Details the procedure for front panel calibration.

Step 2. Voltage calibration

Provides detailed steps for voltage calibration.

Step 3. Current calibration

Provides detailed steps for current calibration.

Routine Maintenance

Line fuse replacement

Provides instructions for replacing the line fuse.

Troubleshooting

Front panel tests

Explains tests for keys and display functionality.

KEYS test

Tests the functionality of each front panel key.

DISPLAY PATTERNS test

Verifies the vacuum fluorescent display functionality.

Analog circuits

Describes the analog circuitry block diagram.

Battery replacement

Provides instructions for replacing the internal battery.

Disassembly

Handling and cleaning

Provides precautions for handling and cleaning.

Static sensitive devices

Explains handling of static-sensitive devices.

Case cover removal

Provides steps to remove the instrument's case cover.

Analog board removal

Provides steps to remove the analog board.

Removing power components

Details procedures for removing power supply and module.

Replaceable Parts

Parts lists

Refers to tables for electrical parts and mechanical assemblies.

Ordering information

Details information needed for ordering parts.

Specifications

2400, 2400-LV and 2400-C SourceMeter® Specifications

Core technical specifications for the instrument.

SOURCE SPECIFICATIONS

Details specifications for source functions.

MEASURE SPECIFICATIONS

Details specifications for measure functions.

SYSTEM SPEEDS

Details instrument speed performance.

Accuracy calculations

Measure accuracy

Explains how to calculate measurement accuracy.

Source accuracy

Explains how to calculate source accuracy.

Command Reference

Command summary

Summarizes Model 2400 calibration commands.

Miscellaneous commands

Describes commands for saving, locking, and programming dates.

Detecting calibration errors

Explains how to detect calibration errors.

Detecting calibration step completion

Methods to detect calibration step completion.

Calibration Programs

Computer hardware requirements

Lists required computer hardware for programs.

Software requirements

Lists required computer software for programs.

General program instructions

Provides general instructions for running programs.

Program C-1. Model 2400 calibration program

Provides a BASIC program for calibration.