Keithley 6487

Model 6485 Picoammeter
Model 6487 Picoammeter/Voltage Source
User’s Manual
6487-900-01 Rev. B / January 2003
A GREATER MEASURE OF CONFIDENCE
Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176 - TestEquipmentDepot.com

Keithley 6487 Specifications

General

Type	Picoammeter/Voltage Source
Current Measurement Range	20 fA to 20 mA
Interfaces	GPIB, RS-232
Voltage Burden	< 200 µV
Input Impedance	>10^14 Ω
Power	100 V / 120 V / 220 V / 240 V
Basic Current Measurement Accuracy	0.4%

Summary

Warranty Information

Safety Precautions

User Types and Responsibilities

Defines user roles and responsibilities for safe operation and maintenance.

Measurement Categories and Shock Hazard

Explains measurement categories (IEC 60664) and precautions for shock hazards.

General Safety and Handling

Connections

Model 6485 Input Connector and Levels

Details the BNC input connector and maximum input levels for the Model 6485.

Model 6487 Input Connector and Cables

Details the triax input connector for Model 6487 and recommendations for low-noise cables.

Basic DUT Connections

Covers connections for current and ohms measurements to the Device Under Test.

Model 6487 Interlock System

Explains the built-in interlock function for ensuring safe operation.

Measurements and Sourcing Voltage

Current Measurement Procedures

Provides basic steps, precautions, and SCPI commands for current measurements.

Model 6487 Ohms Measurements

Covers setup and usage methods for the Model 6487 ohms measurement function.

Model 6487 Voltage Source Operation

Details the configuration and usage of the Model 6487's voltage source.

Range, Units, Digits, Rate, and Filters

Range Selection and Autoranging

Details manual and autorange selection, including limits.

Range, Units, and Digits Settings

Measurement Filters

Measurement Filters Overview

Introduces median and digital filters for stabilizing measurements.

Relative, mX+b, mX+b, and Logarithmic Functions

Math Functions (mX+b, mX+b, Log)

Covers three basic math operations: mX+b, m/X+b, and Logarithmic.

Remote Operation and Commands

Interface Selection and Configuration

Explains how to select and configure GPIB or RS-232 interfaces.

Specifications

Getting Started

Instrument Features and Familiarization

Power-Up and Default Settings

Model 6485 Front Panel Summary

Model 6485 Front Panel Controls

Model 6485 Rear Panel Summary

Model 6487 Front Panel Summary

Model 6487 Front Panel Controls

Model 6487 Rear Panel Summary

Power-Up Procedures

Line Power Connection

Step-by-step guide for connecting the instrument to AC power.

Power-Up Sequence Details

Default Settings and Setup Management

Saving and Restoring User Setups

Restoring Factory Defaults

SCPI Programming Introduction

Model 6485 Input Connector and Levels

Model 6487 Input Connector and Cables

Model 6487 Voltage Source Connectors and Levels

Model 6485 DUT Connections

Basic Model 6485 Connections

Noise and Safety Shields

Model 6487 DUT Connections

Current Measurement Connections

Shows basic connections for current measurements with the Model 6487.

Ohms Measurement Connections

Model 6487 Interlock System

Interlock Connections and Operation

Performance Considerations

Warm-up Period and Voltage Offset Correction

Autozero Functionality

Zero Check and Zero Correct Procedures

Current Measurement Precautions

Current Measurement Procedure

Model 6487 Ohms Measurements

Ohms Measurement Overview and Procedure

Configuring the Model 6487 Voltage Source

Sourcing Voltage and Operator Key Functions

Open Interlock Indication and SCPI Commands

Range Selection and Management

Measurement Filters Overview

Configuring Math Functions on Front Panel

Buffer and Sweeps

Buffer Operations Overview

Model 6487 Voltage Sweeps

Storing and Recalling Buffer Data

Model 6487 Voltage Sweeps

Generating Front Panel Voltage Sweeps

Selecting and Configuring Communication Interfaces

GPIB and RS-232 Interface Configuration

Common Commands (IEEE-488.2)

Signal Oriented Commands

SCPI Command Subsystems

6485 Picoammeter Specifications

General 6485 Specifications

Covers general specs like input connector, display, ranging, conversion time, reading rate, EMC, safety, and environment.

6485 IEEE-488 and RS-232 Implementation

6485 Accuracy, Range, and Timing Details

Provides detailed accuracy, range, noise, and timing specifications for the Model 6485.

6487 Picoammeter Specifications

6487 Remote Operation and Implementation

6487 Accuracy, Range, and Voltage Source Details

Provides detailed accuracy, range, and voltage source specifications for the Model 6487.

Ground Loops and Measurement Errors

Example Programs

Programming Examples Introduction

1000 ReadingsSecond into Internal Buffer

900 ReadingsSecond to IEEE-488 Bus

3000 Readings into Internal Buffer