Keithley 2182 Service Manual

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 following command: *SRE 4. 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.
Error number Error message
+430 "Precal selection error"
+431 "Precal offset DAC zero error"
+432 "ACAL Temperature error"
+438 "Date of calibration not set"
+439 "Next date of calibration not set"
+440 "Gain-aperture correction error"
+449 "10 vdc ch2 Low-Q zero error"
+500 "Calibration data invalid"
Table B-5
Calibration errors (cont.)
B-12 Calibration Reference

Keithley 2182 Specifications

General

Type	Nanovoltmeter
Input Impedance	>10 GΩ
Display	LCD
Input Resistance	>10 GΩ
Reading Rate	1000 readings/second
Interface	GPIB
Power Supply	100-240 VAC

Summary

Performance Verification

Introduction

Overview of verifying instrument accuracy against specifications.

Verification Test Requirements

Lists conditions and prerequisites for performing verification tests.

Environmental Conditions

Specifies ambient temperature and humidity for verification.

Recommended Test Equipment

Lists essential test equipment for performance verification.

Auto-Calibration (ACAL)

Steps to perform auto-calibration before verification.

Voltage Measurement Accuracy

Procedure to verify voltage measurement accuracy.

Temperature Measurement Accuracy

Procedure to verify temperature measurement accuracy.

Analog Output Accuracy

Procedure to verify the accuracy of the analog output signal.

Calibration

Introduction and Considerations

Overview of calibration, conditions, and important considerations.

Calibration Menu

How to access and navigate the calibration menu items.

Front Panel Code Entry

Procedure to enter the calibration unlock code via the front panel.

Remote Calibration Code

Procedure to unlock calibration using remote commands.

Normal Calibration Procedures

Steps for performing standard field calibration.

Factory Calibration Procedures

Procedures for factory calibration, typically after repair.

Troubleshooting

Introduction and Self-Tests

Overview of troubleshooting, repair considerations, and front panel tests.

Repair Considerations

Important notes before attempting repairs, including PC-board handling.

Front Panel Tests

Tests for front panel keys and display functionality.

Principles of Operation

Explanation of internal circuitry to aid troubleshooting.

Circuit Checks

Tables for checking digital and analog circuit components and signals.

No Comm Link Error

Troubleshooting steps for communication errors between processors.

Disassembly and Reassembly

Handling and Static Precautions

Procedures for handling PC boards and static-sensitive devices.

Component Removal Procedures

Steps for removing case, motherboard, and power components.

Firmware Replacement

Procedure for replacing the main CPU firmware (EPROMs).

Replaceable Parts

Parts Lists and Ordering

Lists electrical and mechanical parts, and ordering information.

Component Layouts

References to drawings showing component locations on circuit boards.

Motherboard Parts List

Detailed list of components on the motherboard with part numbers.

Mechanical Parts List

List of mechanical parts with Keithley part numbers.

Specifications

Voltage and Noise Specifications

Detailed accuracy for voltage measurements and noise performance.

Temperature and Operating Specs

Temperature accuracy, operating characteristics, and system speeds.

Measurement Characteristics

Details on linearity, autozero, input impedance, and protection.

General Specifications

Overall specs including power, environment, warranty, and safety.

Calibration Reference

Command Summary and Details

Lists and describes remote calibration commands and constants.

Calibration Step Execution

Describes commands for executing specific calibration steps.

Error Detection and Completion

Methods for detecting calibration errors and step completion.

Calibration Program

Program Requirements and Setup

Computer/software requirements and essential calibration equipment.

Program Instructions

Instructions for setting up and running the BASIC calibration program.