Keithley Instruments 6517B User Manual

Model 6517B Electrometer

User’s Manual

6517B-900-01 Rev. A / June 2008

www.keithley.com

A GREATER MEASURE OF CONFIDENCE

WARRANTY

Keithley Instruments, Inc. warrant s this product to be free from defect s in materia l and workmanship fo r a per iod of
one (1) year from date of shipment.

Keithley Instruments, Inc. warrants the following items for 90 days from the date of shipment: probes, cables,
software, rechargeable batteries, diskettes, and documentation.

During the warranty period, Keithley Instruments will, at its option, either repair or replace any product that proves
to be defective.

To exercise this warranty, write or call your local Keithley Instruments representative, or contact
Keithley Instruments headquarters in Cleveland, Ohio. You will be given prompt assistance and return instructions.
Send the product, transportation prepaid, to the indicated service facility. Repairs will be made and the product
returned, transportation prepaid. Repaired or replaced products are warranted for the balan ce of the original
warranty period, or at least 90 days.

LIMITATION OF WARRANTY

This warranty does not apply to defects resulting from product modification without Keithley Instruments’ express
written consent, or misuse of any product or part. This warranty also does not apply to fuses, software,
non-rechargeable batteries, damage from batter y leakage, or problems arising from normal wear or failure to follow
instructions.

THIS WARRANTY IS IN LIEU OF ALL OTHER WARRANTIES, EXPRESSED OR IMPLIED, INCLUDING ANY
IMPLIED WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR USE. THE REMEDIES
PROVIDED HEREIN ARE BUYER’S SOLE AND EXCLUSIVE REMEDIES.

NEITHER KEITHLEY INSTRUMENTS, INC. NOR ANY OF ITS EMPLOYEES SHALL BE LIABLE FOR ANY
DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE USE
OF ITS INSTRUMENTS AND SOFTWARE, EVEN IF KEITHLEY INSTRUMENTS, INC. HAS BEEN ADVISED IN
ADVANCE OF THE POSSIBILITY OF SUCH DAMAGES. SUCH EXCLUDED DAMAGES SHALL INCLUDE, BUT
ARE NOT LIMITED TO: COST OF REMOVAL AND INSTALLATION, LOSSES SUSTAINED AS THE RESULT OF
INJURY TO ANY PERSON, OR DAMAGE TO PROPERTY.

A G R E A T E R M E A S U R E O F C O N F I D E N C E

Keithley Instruments, Inc.

Corporate Headquarters • 28775 Aurora Road • Cleveland, Ohio 44139

440-248-0400 • Fax: [phone] • 1-888-KEITHLEY (1-888-534-8453) • www.keithley.com

3/07

Model 6517B

Any unauthorized reproduction, photocopy, or use the information herein, in whole or in part, without the prior written

approval of Keithley Instruments, Inc. is strictly prohibited.

TSP, TSP-Link, and TSP-Net are trademarks of Keithley Instruments, Inc.

All Keithley Instruments product names are trademarks or registered trademarks of Keithley Instruments, Inc.

Other brand names are trademarks or registered trademarks of their respective holders.

Electrometer

User’s Manual

©2008, Keithley Instruments, Inc.

All rights reserved.

Cleveland, Ohio, U.S.A.

Document Number:

6517B-900-01 Rev. A / Jun 2008

The following safety precautions should be observed before using this product an d any associated instrumentation. Although some
instruments and accessories would normally be used with non-hazardous voltages, there are situations where hazardous conditions may
be present.

This product is intended for use by qualified personnel who recognize shock hazards and are familiar with the safety precautions required
to avoid possible injury. Read and follow all installation, operation, and maintenance information carefully before using the product. Refer
to the user documentation for complete product specifications.

If the product is used in a manner not specified, the protection provided by the product warranty may be impaired.
The types of product users are:
Responsible body is the individual or group responsible for the use and maintenance of equipment, for ensuring that the equipment is

operated within its specifications and operating limits, and for ensuring that operators are adequately trained.
Operators use the product for its intended function. They must be trained in electrical safety procedures and proper use of the instrument.

They must be protected from electric shock and contact with hazardous live circuits.
Maintenance personnel perform routine procedures on the product to keep it operating properly, for example, setting the line voltage or

replacing consumable materials. Maintenance procedures are described in the user documentation. The procedures explicitly state if the
operator may perform them. Otherwise, they should be performed only by service personnel.

Safety Precautions

Service personnel are trained to work on live circuits, perform safe installations, and repair products. Only properly trained service

personnel may perform installation and service procedures.
Keithley Instruments products are designed for use with electrical signals that are rate d Measurement Category I and Measurement

Category II, as described in the International Electrotechnical Commission (IEC) Standard IEC 60664. Most measurement, control, and
data I/O signals are Measurement Category I and must not be directly connected to mains voltage or to voltage sources with high transient
over-voltages. Measurement Category II connections require protection for high transient over-voltages often associated with local AC
mains connections. Assume all measurement, control, and data I/O connections are for connection to Category I sources unless otherwise
marked or described in the user documentation.

Exercise extreme caution when a shock hazard is present. Lethal voltage may be present on cable connector jacks or test fixtures. The
American National Standards Institute (ANSI) states that a shock hazard exists when voltage levels greater than 30V RMS, 42.4V peak,
or 60VDC are present. A good safety practice is to expect that hazardous voltage is present in any unknown circuit before measuring.

Operators of this product must be protected from electric shock at all times. The responsible body must ensure that operators are
prevented access and/or insulated from every connection point. In some cases, connections must be exposed to potential human contact.
Product operators in these circumstances must be trained to protect themselves from the risk of electric shock. If the circuit is capable of
operating at or above 1000V, no conductive part of the circuit may be exposed.

Do not connect switching cards directly to unlimited power circuits. They are intended to be used with impedance-limited sources. NEVER
connect switching cards directly to AC mains. When connecting sources to switching cards, install protective devices to limit fault current
and voltage to the card.

Before operating an instrument, ensure that the line cord is connected to a properly-grounded power receptacle. Inspect the connecting
cables, test leads, and jumpers for possible wear, cracks, or breaks before each use.

11/07

When installing equipment where access to the main power cord is restricted, such as rack mounting, a separate main input power

!

disconnect device must be provided in close proximity to the equipment and within easy reach of the operator.
For maximum safety, do not touch the product, test cables, or any other instruments while power is applied to the circuit under test.

AL W AYS remove power from the entire test system and discharge any capacitors before: connecting or disconnecting cables or jumpers,
installing or removing switching cards, or making internal changes, such as installing or removing jumpers.

Do not touch any object that could provide a current path to the common side of the circuit under test or power line (earth) ground. Always
make measurements with dry hands while standing on a dry, insulated surface capable of withstanding the voltage being measured.

The instrument and accessories must be used in accordance with its specifications and operating instructions, or the safety of the
equipment may be impaired.

Do not exceed the maximum signal levels of the instruments and accessories, as defined in the specifications and operating information,
and as shown on the instrument or test fixture panels, or switching card.

When fuses are used in a product, replace with the same type and rating for continued protection against fire hazard.
Chassis connections must only be used as shield connections for measuring circuits, NOT as safety earth ground connections.
If you are using a test fixture, keep the lid closed while power is applied to the device under test. Safe operation requires the use of a lid

interlock.
If a screw is present, connect it to safety earth ground using the wire recommended in the user documentation.
The symbol on an instrument indicates that the user should refer to the operating instructions located in the user documentation.
The symbol on an instrument shows that it can source or measure 1000V or more, including the combined effect of normal and

common mode voltages. Use standard safety precautions to avoid personal contact with these voltages.
The symbol on an instrument shows that the surface may be hot. Avoid personal contact to prevent burns.
The symbol indicates a connection terminal to the equipment frame.

If this symbol is on a product, it indicates that mercury is present in the display lamp. Please note that the lamp must be properly
disposed of according to federal, state, and local laws.

The WARNING heading in the user documentation explains dangers that might result in personal injury or death. Always read the
associated information very carefully before performing the indicated procedure.

The CAUTION heading in the user documentation explains hazards that could damage the instrument. Such damage may invalidate the
warranty.

Instrumentation and accessories shall not be connected to humans.
Before performing any maintenance, disconnect the line cord and all test cables.
T o maintain protection from electric shock and fire, replacement components in mains circuits - including the power transformer, test leads,

and input jacks - must be purchased from Keithley Instruments. Standard fuses with applicable national safety approvals may be used if
the rating and type are the same. Other components that are not safety-related may be purchased from other suppliers as long as they
are equivalent to the original component (note that selected parts should be purchased only through Keithley Instruments to maintain
accuracy and functionality of the product). If you are unsure about the applicability of a replacement component, call a Keithley Instruments
office for information.

To clean an instrument, use a damp cloth or mild, water-based cleaner. Clean the exterior of the instrument only. Do not apply cleaner
directly to the instrument or allow liquids to enter or spill on the instrument. Products that consist of a circuit board with no case or chassis
(e.g., a data acquisition board for installation into a computer) should never require cleaning if handled according to instructions. If the
board becomes contaminated and operation is affected, the board should be returned to the factory for proper cleaning/servicing.

Table of Contents

Section Topic Page

1 Introduction............................................................................................. 1-1

Overview..................................................................................................... 1-2

Capabilities and features overview....................................................... 1-2

Options and accessories...................................................................... 1-3

Specifications....................................................................................... 1-5

Unpacking and inspection........................................................................... 1-5

Inspection for damage.......................................................................... 1-5

Handling precautions ........................................................................... 1-5

Shipment contents ............................................................................... 1-5

Documentation..................................................................................... 1-5

Repacking for shipment........................................................................ 1-6

2 Getting Started....................................................................................... 2-1

Introduction................................................................................................. 2-2

Front and rear panel familiarization............................................................ 2-2

Front panel summary........................................................................... 2-2

Rear panel summary............................................................................ 2-4

Power-up .................................................................................................... 2-6

Line power connection......................................................................... 2-6

Power-up procedure............................................................................. 2-6

Display........................................................................................................ 2-6

Primary display line.............................................................................. 2-6

Secondary display line ......................................................................... 2-7

Bench defaults............................................................................................ 2-7

Restoring bench defaults...................................................................... 2-7

Function default settings...................................................................... 2-7

3 Basic Measurements ............................................................................ 3-1

Introduction................................................................................................. 3-2

Changing functions..................................................................................... 3-2

Voltage measurements............................................................................... 3-2

Guarding .............................................................................................. 3-3

Current measurements............................................................................... 3-4

Resistance measurements......................................................................... 3-5

Auto V-Source...................................................................................... 3-6

Amps Rel.............................................................................................. 3-6

Resistivity measurements ........................................................................... 3-7

Charge measurements ............................................................................... 3-9

Auto discharge ................................................................................... 3-10

Temperature and humidity measurements ............................................... 3-10

Connections....................................................................................... 3-10

Measurement control ......................................................................... 3-11

Temperature units............................................................................... 3-11

Display reading options...................................................................... 3-12

4 Measurement Options.......................................................................... 4-1

Introduction................................................................................................. 4-3

Multiple displays ......................................................................................... 4-3

Menus......................................................................................................... 4-5

Navigating menus ................................................................................ 4-6

Table of Contents Model 6517B Electrometer User’s Manual

Section Topic Page

Voltage source ............................................................................................ 4-7

Connections.......................................................................................... 4-7

Basic operation..................................................................................... 4-9

Configuring V-Source........................................................................... 4-9

Relative....................................................................................................... 4-9

Configuring rel .................................................................................... 4-10

Zero check ................................................................................................ 4-10

Zero correct............................................................................................... 4-10

Triggering .................................................................................................. 4-10

Idle...................................................................................................... 4-11

Control sources .................................................................................. 4-12

Device action...................................................................................... 4-12

Output trigger...................................................................................... 4-12

Counters............................................................................................. 4-12

Bench default setup............................................................................ 4-12

Speed ........................................................................................................ 4-13

Configuring speed .............................................................................. 4-13

Resolution................................................................................................. 4-13

Configuring resolution......................................................................... 4-13

Filter.......................................................................................................... 4-13

Filter types.......................................................................................... 4-14

Filter modes........................................................................................ 4-14

Median filter........................................................................................ 4-14

Configuring filters................................................................................ 4-15

Buffer (data store) ..................................................................................... 4-15

Storing readings.................................................................................. 4-15

Math.......................................................................................................... 4-16

Selecting and configuring math.......................................................... 4-17

Enabling math..................................................................................... 4-18

Additional math operations................................................................. 4-18

Test sequences ......................................................................................... 4-19

Configuring test sequences................................................................ 4-19

Connections........................................................................................ 4-20

Running a test .................................................................................... 4-21

Internal scanning ....................................................................................... 4-21

Configure internal scanner ................................................................. 4-21

Perform the scan................................................................................ 4-21

Close/open channels.......................................................................... 4-22

External scanning...................................................................................... 4-22

Trigger connections............................................................................ 4-23

Configure external channels............................................................... 4-23

Perform the scan................................................................................ 4-23

5 Remote Operation.................................................................................. 5-1

Overview..................................................................................................... 5-2

Software support......................................................................................... 5-2

LabView driver...................................................................................... 5-2

Remote interfaces....................................................................................... 5-2

IEEE-488 bus ....................................................................................... 5-2

RS-232 interface................................................................................... 5-3

Common commands................................................................................... 5-5

SCPI commands......................................................................................... 5-5

SCPI command syntax......................................................................... 5-6

SCPI signal-oriented commands.......................................................... 5-8

SCPI subsystem commands ................................................................ 5-8

Program examples.................................................................................... 5-13

Changing function and range ............................................................. 5-13

One-shot triggering............................................................................. 5-14

Continuous triggering #1 .................................................................... 5-15

Continuous triggering #2 .................................................................... 5-15

ii 6517B-900-01 Rev. A / Jun 2008

Model 6517B Electrometer User’s Manual Table of Contents

Section Topic Page

Generating SRQ on buffer full ............................................................ 5-16

Storing readings in the buffer.............................................................. 5-17

Taking readings with the scanner card ............................................... 5-18

Test sequence: Staircase sweep........................................................ 5-19

Index ............................................................................................................................ I-1

6517B-900-01 Rev. A / Jun 2008 iii

Table of Contents Model 6517B Electrometer User’s Manual

This page left blank intentionally.

iv 6517B-900-01 Rev. A / Jun 2008

List of Figures

Section Figure Title Page

2 Figure 2-1 Model 6517B front panel................................................................ 2-2

2 Figure 2-2 Model 6517B rear panel ................................................................ 2-4

3 Figure 3-1 Voltage measurements.................................................................. 3-3

3 Figure 3-2 Current measurements.................................................................. 3-4

3 Figure 3-3 Resistance measurements ............................................................ 3-6

3 Figure 3-4 Resistivity measurements.............................................................. 3-9

3 Figure 3-5 Charge measurements................................................................ 3-10

3 Figure 3-6 External temperature and humidity measurements..................... 3-11

4 Figure 4-1 Main menu display......................................................................... 4-5

4 Figure 4-2 Independent V-Source connections............................................... 4-8

4 Figure 4-3 FVMI connections.......................................................................... 4-8

4 Figure 4-4 Basic trigger model (simplified).................................................... 4-11

4 Figure 4-5 Advanced trigger model (simplified) ............................................ 4-11

4 Figure 4-6 Filter response/noise window ...................................................... 4-14

4 Figure 4-7 Combining math calculations....................................................... 4-18

4 Figure 4-8 Typical FVMI connections............................................................ 4-20

4 Figure 4-9 Trigger connections using trigger link.......................................... 4-23

5 Figure 5-1 IEEE-488 connections ................................................................... 5-3

5 Figure 5-2 Hierarchy of the example SENSe1 commands ............................. 5-6

List of Figures Model 6517B Electrometer User’s Manual

This page left blank intentionally.

vi 6517B-900-01 Rev. A / Jun 2008

List of Tables

Section Table Title Page

4 Table 4-1 Multiple displays by function.......................................................... 4-3

4 Table 4-2 Main menu summary..................................................................... 4-5

4 Table 4-3 Configuration settings for each measurement function................. 4-6

4 Table 4-4 Configuration settings for instrument operations........................... 4-6

4 Table 4-5 Menu summary.............................................................................. 4-7

List of Tables Model 6517B Electrometer User’s Manual

This page left blank intentionally.

viii 6517B-900-01 Rev. A / Jun 2008

In this section:

Topic Page

Overview ................................................................................................. 1-2

Unpacking and inspection....................................................................... 1-5

Section 1

Introduction

Capabilities and features overview ................................................. 1-2

Options and accessories................................................................. 1-3

Specifications.................................................................................. 1-5

Inspection for damage .................................................................... 1-5

Handling precautions ...................................................................... 1-5

Shipment contents.......................................................................... 1-5

Repacking for shipment .................................................................. 1-6

Section 1: Introduction Model 6517B Electrometer User’s Manual

Overview

This section contains general information about the Keithley Instruments Model 6517B
Electrometer.

If you have any questions after reviewing this information, please cont act your local Keithley
Instruments representative or call one of our applications engineers at 1-888-KEITHLEY
(1-888-534-8453) within the U.S. and Canada. You can also contact us through our website at

www.keithley.com.

Capabilities and features overview

The Model 6517B is a 6½-digit electrometer/high-resistance test and measurement system with
the following measurement capabilities:

• DC voltage measurements from 1μV to 210V.

• DC current measurements from 10aA to 21mA.

• Charge measurements from 10fC to 2.1μC.

• Resistance measurements from 10Ω to 210PΩ.

• Surface resistivity measurements.

• Volume resistivity measurements.

• External temperature measurements from -25°C to 150°C using the supplied Model
6517-TP thermocouple.

• Relative humidity measurements (0 to 100%) using the optional Model 6517-RH probe.

Some additional capabilities of the Model 6517B include:

• Built-in V-Source. The 100V range provides up to ±100V at 10mA, while the 1000V range
provides up to ±1000V at 1mA.

• Data storage (50,000 points).

• Single button zeroing (REL).

• Built-in math functions.

• Filtering, averaging, and median.

• Built-in test sequences.

• Remote operation using the IEEE-488 (GPIB) bus or the RS-232 interface.

• Scan (measure) channels of an external scanner.

• Scan (measure) channels of an internal scanner card (for example, Keithley Instruments
Model 6521 or Model 6522) installed in the option slot.

1-2 Return to Section Topics 6517B-900-01 Rev. A / Jun 2008

Model 6517B Electrometer User’s Manual Section 1: Introduction

Options and accessories

The following options and accessories are available from Keithley Instruments for use with the
Model

6517B Electrometer:

NOTE Check the Keithley Instruments website (www.keithley.com) for additional options and

accessories that may have been added to the Keithley Instruments product line for use
with the Model

Cables and adapters

Model 237-ALG-2 Triax Cable: This is a 2-meter (6.6ft) low-noise triax cable terminated with a

3-slot male triax connector on one end and 3 alligator clips on the other.
Model 237-BNC-TRX Adapter: This is a male BNC to 3-lug female triax adapter (guard

disconnected). It is used to terminate a triax cable with a BNC plug. Suit able for use with the Model
6517B V-Source in high voltage applications.

Model 237-TRX-T Adapter: This is a 3-slot male to dual 3-lug fema le triax tee adapter for use with
7078-TRX triax cables. Suitable for use with the Model 6517B V-Source in high voltage
applications.

6517B Electrometer.

Model 237-TRX-TBC Connector: This is a 3-lug female triax bulkhead connector with cap for
assembly of custom panels and interface connections. Suitable for use with the Model 6517B
V-Source in high voltage applications.

Model 6517B-ILC-3 Interlock Cable: This is a 3 meter (6.6 ft) cable terminated with a 4 pin
Phoenix connector on one end and a 4 pin Switchcraft connector on the other end.

Model 7078-TRX-BNC Adapter: This is a 3-slot male triax to female BNC adapter. This adapter
lets you connect a BNC cable to the triax input of the Model 6517B. Suitable for use with the Model
6517B in high voltage applications.

Models 7078-TRX-3, 7078-TRX-10 and 7078-TRX-20 Triax Cables: These are low noise triax
cables terminated at both ends with 3-slot male triax connectors. The Model 7078-TRX-3 is 3ftft
(0.9m) in length, the Model 7078-TRX-10 is 10f t (3m) in length, and the Model 7078-TRX-20 is 20f t
(6m) in length.

Model 7078-TRX-TBC Connector: This is a 3-lug female triax bulkhead connector with cap for
assembly of custom panels and interface connections. Suitable for use with the Model 6517B
V-Source in high voltage applications.

Models 7007-1 and 7007-2 Shielded IEEE-488 Cables: Connect the Model 6517B to the
IEEE-488 bus using shielded cables and connectors to reduce electromagnetic interference (EMI).
The Model 7007-1 is one meter long; the Model 7007-2 is two meters long.

Models 8501-1 and 8501-2 Trigger Link Cables: Connect the Model 6517B to other instruments
with Trigger Link connectors (for example, Model 7001 Switch System). The Model 8501-1 is one
meter long; the Model 8501-2 is two meters long.

Model 8502 Trigger Link Adapter: Allows you to connect the Trigger Link of the Model 6517B to
instruments that use the standard BNC (In/Out) external trig g eri ng tech n iqu e.

Model 8606 High Performance Probe Tip Kit : Consists of two spade lugs, two alligator clips, and
two spring hook test probes (the spade lugs and alligator clips are rated at 30V RMS, 42.4V peak;
the test probes are rated at 1000V). These components are designed to be used with high
performance test leads terminated with banana plugs, such as the Model 8607 High Performance
Banana Cables.

6517B-900-01 Rev. A / Jun 2008 Return to Section T o pics 1-3

Section 1: Introduction Model 6517B Electrometer User’s Manual

Model 8607 High Performance Banana Cables: Consists of two high voltage (1000V) banana
cables. The cables are terminated with banana plugs that have retractable sheaths.

CS-751 Barrel Adapter: This is a barrel adapter that allows you to connect two triax cables
together. Both ends of the adapter are terminated with 3-lug female triax connectors.

Case and rack mount kits

Model 1050 Padded Carrying Case: A carrying case for a Model 6517B. Includes handles and

shoulder strap.
Model 4299-1 Single Fixed Rack Mount Kit: Moun ts a sing le Model 6517B in a sta ndard 19-in ch

rack.
Model 4299-2 Side-by-side Rack Mount Kit: Mounts two instruments side-by-side in a standard

19-inch rack.
Model 4288-4 Side-by-side Rack Mount Kit: Mount s a Mo del 651 7B an d a 5.25-inch in str ument

side-by-side in a standard 19-inch rack.

Probes

Model 6517-RH Humidity Probe with Cable: This sensor allows the Model 6517B to make

relative humidity measurements (0 to 100%). Also included is an extension cable (part number
CA-129-1).

Model 6517-TP Thermocouple with Leads: This type K thermocouple sensor allows the Model
6517B to make external temperature measurements from –190°C to 1350°C.

Scanner cards

Model 6521 Low Current Scanner Card: This 10-channel low current scanner card is terminated

with BNC connectors and plugs into the option slot of the Model 6517B.
Model 6522 Low Current/Low Voltage Scanner Card: This 10-channel low current/low voltage

scanner card is terminated with triax connectors and plugs into the option slot of the Model 6517B.

T est fixture

Model 8009 Resistivity Test Fixture: This is a guarded test fixture for measuring volume and

surface resistivities. It can accommodate sheet samples 64 to 102mm (2-1/2 to 4 in.) in diameter
and up to 3.175mm (1/8 in.) thick.

Software

Model 6524 Hi-R Software Package: Desig ned to aid in ma king more r epeat able high r esista nce/

resistivity measurements. Four windows-driven programs increase measurement precision, ease
download and analysis of Hi-R data, and allow cross-correlation of environmental factors.

1-4 Return to Section Topics 6517B-900-01 Rev. A / Jun 2008

Model 6517B Electrometer User’s Manual Section 1: Introduction

Specifications

Full Model 6517B specifications are included in the Model 6 517B Refere nce Manual, Ap pen dix A.
Check the Keithley Instruments website at www.keithley.com for the latest updates to the
specifications.

Unpacking and inspection

Inspection for damage

The Model 6517B was carefully inspected electrically and mechanically before shipmen t. After
unpacking all items from the shipping carton, check for a ny obvious si gns of physical d amage th at
may have occurred during transit (there may be a protective film over the display lens, which can
be removed). Report any damage to the shipping agent immediately. Save the original packing
carton for possible future shipment. Before removing the Model 6517B from the anti-static bag,
observe the following handling precautions.

Handling precautions

• Always grasp the Model 6517B by the covers.

• After removing the Model 6517B from its anti-static bag, inspect it for any obvious signs
of physical damage; report any such damage to the shipping agent immediately.

• When the Model 6517B is not installed and connected, keep the unit in its anti-static
bag and store it in the original packing carton.

Shipment contents

The following items are included with every Model 6517B order:

• Model 6517B Electrometer with line cord

• Protective Triax Shield/Cap (CAP-28-1)

• 237-ALG-2 Triax Cable terminated with alligator clips on one end

• Accessories as ordered

• Certificate of calibration

• CD containing complete documentation and required software

Documentation

A CD-ROM containing this User’s Manual, a Re ference Manual, and r equired sof tware is included
with each Model 6517B. Check the Keithley Instruments website at www.keithley.com for the latest
versions of the manuals. The latest manuals can be downloaded (in PDF format) from the website.

6517B-900-01 Rev. A / Jun 2008 Return to Section T o pics 1-5

Section 1: Introduction Model 6517B Electrometer User’s Manual

Repacking for shipment

Should it become necessary to return the Model 6517B for repair, carefully pack the unit in its
original packing carton or the equivalent, and follow these instructions:

• Call the repair department toll-free at 1-888-KEITHLEY (1-888-534-8453), within the U.S.
and Canada, to obtain a Return Material Authorization (RMA) number.

• Advise as to the warranty status of the Model 6517B.

• Write ATTENTION REPAIR DEPARTMENT and the RMA number on the shipping label.

• Complete and include the Service Form located at the back of this manual.

1-6 Return to Section Topics 6517B-900-01 Rev. A / Jun 2008

In this section:

Topic Page

Introduction .............................................................................. ... ............ 2-2

Front and rear panel familiarization......................................................... 2-2

Power-up ............................... ... ....................................... ... .................... 2-6

Display .................................................................................................... 2-6

Section 2

Getting Started

Front panel summary .................................... ........... ........ ........... .... 2-2

Rear panel summary .............................................................. .. ...... 2-4

Line power connection ................................................................... 2-6

Power-up procedure ....................................................................... 2-6

Primary display line ........................................................................ 2-6

Secondary display line ................................................................... 2-7

Bench defaults ....................................... ....................................... ... ....... 2-7

Restoring bench defaults ................................ ................................ 2-7

Function default settings ................................................................ 2-7

Section 2: Getting Started Model 6517B Electrometer User’s Manual

VOLTAGE

SOURCE

OPERATE

6517B ELECTROMETER/HIGH RESISTANCE METER

EDIT ERR REM TALK LSTN SRQ REAR REL FILT MATH 4W AUTO ARM TRIG SMPL

1 2 3 4 5 6 7 8 9 10 1 2 3 4 5 6 7 8 9 10

PREV

NEXT

DISPLAY

Z-CHK REL

FILTER

MATH TRIG SEQ

INFO

LOCAL STORE

RECALL

CONFIG

MENU

EXIT

ENTER

VI R

Q

CARD OPER

OPTION

VOLTAGE SOURCE

POWER

AUTO

RANGE

RANGE

5

19

273864

Secondary display line

Primary display line

Introduction

This section contains identification and descriptions of controls and components of the Keithley
Instruments Model 6517B Electrometer and det ailed informa tion for powering up the Mode l 6517B.

Front and rear panel familiarization

Front panel summary

The front panel of the Model 6517B is shown in Figure 2-1. The descriptions of the front panel
controls follow Figure 2-1.

Figure 2-1

Model 6517B front panel

1 ANNUNCIATORS

EDIT Editing voltage source values
ERR Questionable reading
REM In remote
TALK Addressed to talk
LSTN Addressed to listen
SRQ Service Request
REL Relative reading displayed
FILT Digital filter enabled
MATH Math calculation enabled
AUTO Autoranging enabled
ARM Trigger armed; not in idle
*(asterisk) Reading being stored

2-2 Return to Section Topics 6517B-900-01 Rev. A / Jun 2008

Model 6517B Electrometer User’s Manual Section 2: Getting Started

2 F UNCTION KEYS

Select measurement function; volts (V), amps (I), resistivity (R) or coulombs (Q).

3 RAN GE KEYS

Moves to higher range; increments digit.
Moves to lower range; decrements digit.

AUTO Enables/disables autorange.

4 HANDLE

Pull out and rotate to desired position.

5 DISPLAY KEYS

PREV/NEXT Scroll through multiple displays of a function.

6 OPERATION KEYS

Z-CHK Enables/disables zero check: enable zero check before changing functions.
REL Enables/disables relative reading.
FILTER Displays digital filter status for present function and toggles filter on/off.
MATH Displays math calculation and toggles math on/off if configured.
TRIG Triggers unit.
SEQ Performs selected test sequence.

and Moves cursor among data entry digits, menu selections, and information displays.

INFO Shows context-sensitive information about the present display.
LOCAL Cancels remote operation.
STORE Enables data storage.
RECALL Displays reading data (reading, number, time). Use PREV/NEXT DISPLAY for

maximum, minimum average, standard deviation.
CONFIG Configures functions and operations.
MENU Saves/restores instrument conditions; sets up communications; performs calibration

and self-tests; defines limits, digital output, and other miscellaneous operations.
EXIT Cancels selection, moves back within menu structure.
ENTER Holds reading, enters selection, moves down within menu structure.

7 VOLTAGE SOURCE KEYS

OPER Toggles V-source between operate and standby.

and Adjusts V-source value.

8 VO LTA GE SOU RCE OPERATE

Indicator light is on when in operation, off in standby.

9 OPTION CARD KEY

Use to program and operate an optional feature. Also use to view external scanner channels.

6517B-900-01 Rev. A / Jun 2008 Return to Section T o pics 2-3

Section 2: Getting Started Model 6517B Electrometer User’s Manual

8

9101112131415

Input high

Input low
Chassis ground

Unguarded (guard off)

Input high

Guard
Chassis ground

Guarded (guard off)

OPTION SLOT

250VDC MAX

MADE IN

U.S.A

LINE RATING

50-60 Hz

100 VA MAX.

LINE

WARNING:

NO INTERNAL OPERATOR SERVICABLE PARTS, SERVICE BY QUALIFIED PERSONNEL ONLY.

CAUTION:

FOR CONTINUED PROTECTION AGAINST FIRE HAZARD, REPLACE FUSE WITH SAME TYPE AND RATING.

1250Vpk

PREAMP

OUT

1000VDC

MAX

FUSE

630mAT

315mAT

100V
120V
220V
240V

COMMON 2V OUT

LO HI

V SOURCE

TRIGGER LINK RS-232

DIGITAL I/O

HUMIDITY

TEMP

TYPE K

INTERLOCK

IEEE-488

2VDC MAX

1234567

Rear panel summary

The rear panel of the Model 6517B is shown in Figure 2-2. The descriptions of the rear panel
components follow Figure 2-2.

Figure 2-2

Model 6517B rear panel

1 INPUT CONNECTOR

Unguarded Configuration Disable GUARD for amps, ohms, coulombs

and unguarded voltage measurements.

Guarded Configuration Enable GUARD for guarded voltage measurements.

2PREAMP OUT

Follows the signal amplitude applied to the INPUT terminal. With GUARD on, PREAMP OUT is connected
to the inner shell of the INPUT triax connector to configure the input for guarded voltage measurements.
Referenced to COMMON. See the Model 6517B Reference Manual for more information.

2-4 Return to Section Topics 6517B-900-01 Rev. A / Jun 2008

Model 6517B Electrometer User’s Manual Section 2: Getting Started

3COMMON

Connector that is internally connected to INPUT low.

4 CHASSIS GROUND

Attached cable that connects the chassis to ground through the power line cord. COMMON can be
connected to chassis ground by plugging the cable into COMMON. For floating measurements, make sure
the ground cable connection between COMMON and Chassis Ground is open.

5 2V ANALOG OUTPUT

Connector provides a scaled 0 to 2V output that is referenced to COMMON. It is typically connected to a
measuring device such as a chart recorder. See the Model 6517B Reference Manual for more information.

6 HUMIDITY

Connect the optional Keithley Instruments Model 6517-RH probe for relative humidity measurements.

7 TEMP TYPE K

Connect the Keithley Instruments Model 6517-TP type K thermocouple for temperature measurements.

8 POWER LINE INPUT MODULE

Provides connections for power line input and contains the line fuse. If the fuse needs to be replaced, refer
to the procedure in Section 2 of the Model 6517B Reference Manual.

9 IEEE-488 CONNECTOR

Connects the Model 6517B to the IEEE-488 (GPIB) bus. Use shielded IEEE-488 cables.

10 INTERLOCK

Connects the safety interlock to a test fixture using an appropriate cable. Interlock is automatically enabled
when the appropriate interlock cable is connected to the 6517B. Rated at 50-60 Hz, 140 VA max. The
interlock’s CS-1305 connector includes four pins (left to right as viewed from rear of the 6517B):

• Pin 1: Interlock safe

• Pin 2: Ground

• Pin 3: +5 VDC output

• Pin 4: Surface/volume select (low = volume, high = surface)

11 RS-232

DB-9 connector for the RS-232 interface. Use a standard RS-232 cable.

12 DIGITAL I/O

A male DB-9 connector for the four TTL-compatible digital output lines.

13 TRIGGER LINK

An 8-pin micro DIN connector for sending and receiving trigger pulses to and from other instruments.

14 V-SOURCE HI and LO

Safety banana jacks for the voltage source.

15 OPTION SLOT

An option card, such as the Keithley Instruments Model 6521 or Model 6522 scanner card, can be installed
in this slot.

6517B-900-01 Rev. A / Jun 2008 Return to Section T o pics 2-5

Section 2: Getting Started Model 6517B Electrometer User’s Manual

Power-up

Line power connection

Follow the procedure below to connect the Model 6517B to line power and turn on the instrument.

CAUTION Operating the instrument on an incorrect line voltage may cause damage to

the instrument, possibly voiding the warranty.

1. Before plugging in the power cord, make sure that the front panel power switch is in the off
(O) position. Be sure that line input voltage is set to the correct range for the power supply
being used to power the Model 6517B.

NOTE Line voltage is pre-set at the factory, but may be reset in the field by adjusting the voltage

selector behind the left ear. To access the voltage selector, first remove the handle then
remove the left mounting ear. The current voltage setting is the marking closest to the
small circle.

2. Connect the female end of the supplied power cord to the AC receptacle on the rear pan el.
Connect the other end of the power cord to a grounded AC outlet.

WARNING The power cord supplied with the Model 6517B contain s a separate ground

wire for use with grounded outlets. When proper connections are made,
instrument chassis is connected to power line ground through the gr ound
wire in the power cord. Failure to use a grounded outlet may r esult in personal
injury or death due to electric shock.

Power-up procedure

1. Turn on the instrument by pressing the front panel power switch to the on (I) position.

2. During power-up, the Model 6517B performs self-tests on its memory elements. If a failure
occurs, the instrument momentarily displays an error message and turns on the ERR
annunciator. If the instrument passes the self-tests, the firmware revision level and bus
interface information are displayed. For complete information on the power-up sequence,
see Section 2 in the Model 6517B Reference Manual.

Display

As shown in the Model 6517B front panel illustration (see Figure 2-1), the front panel has three
lines of display information: the primary display line, the secondary display line, and annunciators.

Primary display line

The top line displays readings along with units. It can also display measu rement type, “hold,” math
operating type, channel number, menu headings, and messages. Status and error messages are
listed in Section 2 of the Reference Manual.

2-6 Return to Section Topics 6517B-900-01 Rev. A / Jun 2008

Model 6517B Electrometer User’s Manual Section 2: Getting Started

Secondary display line

The bottom line displays the range, V -Sou rce value, menu items, messages, and multiple displays
(see

Section 4). Longer text strings are indicated by arrows on either end of the display line. Use

the cursor keys ( and ) to display the additional information.

Bench defaults

The Model 6517B can save ten user setups in non-volatile me mory. You can select one of the user
setups as the power-on default or have the instrument power up to either of the two factory
defaults (optimized for “BENCH” or “GPIB” operation). For more information on saving and
restoring user setups, see Section 2 in the Model 6517B Reference Manual.

Restoring bench defaults

Since the basic measurement procedures in this manual assume the BENCH defaults, reset the
instrument from the SAVESETUP item of the MAIN MENU by performing the following steps:

1. Press the MENU key to display the main menu:

MAIN MENU

SA VESETUP COMMUNICATION CAL TEST LIMITS STATUS-MSG GENERAL

2. If the SAVESETUP option is not blinking, press the key until it is blinking and then press
ENTER to view the setup menu:

SETUP MENU

SAVE RESTORE POWERON RESET

3. Select the RESET option using the cursor keys ( and ) and press ENTER to view the
reset menu:

RESET ORIGINAL DFLTS

BENCH GPIB

4. Select the BENCH option using the cursor keys ( and ) and press ENTER. The following
message is displayed:

RESETTING INSTRUMENT

Press ENTER to confirm, EXIT to abort.

5. Press ENTER to confirm. The display will go to the volts function with zero check enabled
and auto-range disabled.

Function default settings

Other BENCH default settings for each function include:

• Triggers: Continuous measurements

• Measurement speed (integration time): Normal, 1 power line cycle

• Digital filter: Enabled, averaging, 10 readings

• Median filter: Enabled, rank 1

• Display resolution: 5½ digits

See Menus for more information.

6517B-900-01 Rev. A / Jun 2008 Return to Section T o pics 2-7

Section 2: Getting Started Model 6517B Electrometer User’s Manual

This page left blank intentionally.

2-8 Return to Section Topics 6517B-900-01 Rev. A / Jun 2008

In this section:

Topic Page

Introduction ............................................................................................. 3-2

Changing functions ................................................................................. 3-2

Voltage measurements............................................................................ 3-2

Current measurements............................................................................ 3-4

Resistance measurements...................................................................... 3-6

Section 3

Basic Measurements

Guarding ......................................................................................... 3-3

Auto V-Source................................................................................. 3-6

Amps Rel......................................................................................... 3-6

Resistivity measurements ....................................................................... 3-7

Charge measurements ............................................................................ 3-9

Auto discharge................................................................................ 3-10

Temperature and humidity measu r ements.............................................. 3-10

Connections.................................................................................... 3-10

Measurement control ...................................................................... 3-11

Temperature units ........................................................................... 3-11

Display reading options................................................................... 3-12

Section 3: Basic Measurements Model 6517B Electrometer User’s Manual

Introduction

This section provides information on taking basic measurements. For more detailed information,
see

Section 4 and the Keithley Instruments Model 6517B Reference Manual.

Changing functions

To avoid erratic operation, always enable zero check (“ZeroCheck” displayed) before selecting one
of the other measurement functions (V, I, R, or Q). The Z-CHK key controls zero check (

check for more information)

see Zero

V olt age measurements

Assuming “BENCH” reset conditions, the basic procedure is as follows:

1. With zero check enabled (“ZeroCheck” displayed), select the volts function by pressing V.
The Z-CHK key is used to enable and disable zero check.

2. Enable or disable guard as needed (see Guarding for more information). Note that with
guard enabled (ON), the “Grd” message is displayed. However, if zero correct is already
enabled (“ZCor” displayed), then “Grd” will not be displayed.

3. To achieve optimum accuracy for low voltage measurements, zero correct the Model
6517B. To do this, use the RANGE key to select the lowest measurement range (2V)
and press REL. With zero correct enabled, the REL indicator is on. Note that with zero
correct enabled, the “ZCor” message is displayed. However, if guard is already enabled
(“Grd” displayed), then “ZCor” will not be displayed.

4. Select a measurement range or use autoranging:

a. To automatically select the most sensitive range, enable autorange. The AUTO key

enables and disables autorange. When enabled, the AUTO ann unciator is on.

b. For manual ranging, use the RANGE and keys to select a measurement range

consistent with the expected voltage.

5. Connect the test cable(s) to the voltage to be measured. Figure 3-1A shows connections for
unguarded measurements, and Figure 3-1B shows connections for guarded
measurements.

WARNING Hazardous voltage may be present on the inner shield of the triax cable when

GUARD is on. A safety shield connected to safety earth ground (as shown in

Figure 3-1B) should be used for voltage measurements at or above 30V.

CAUTION Do not apply more than 250V peak (DC to 60Hz) to the input or instrument

damage may occur.

6. Press Z-CHK to disable zero check and take a reading from the display.

3-2 Return to Section Topics 6517B-900-01 Rev. A / Jun 2008

Model 6517B Electrometer User’s Manual Section 3: Basic Measurements

Red (HI)

Black (LO)

6517B

Shield (Optional)

Vs

Measured

Voltage

+

-

Red (HI)

LO

6517B

Safety
Shield

Vs

+

-

Safety

Earth

Ground

Measured

Voltage

Triax

Cable

A. Unguarded (GUARD off)

Triax

Cable

Guard

Black

Green

B. Guarded (GUARD on)

OPTION SLOT

250VDC MAX

MADE IN

U.S.A

LINE RATING

50-60 Hz

100 VA MAX.

LINE

WARNING: NO INTERNAL OPERATOR SERVICABLE PARTS, SERVICE BY QUALIFIED PERSONNEL ONLY.

CAUTION: FOR CONTINUED PROTECTION AGAINST FIRE HAZARD, REPLACE FUSE WITH SAME TYPE AND RATING.

1250Vpk

PREAMP

OUT

1000VDC

MAX

FUSE

630mAT

315mAT

100V
120V
220V
240V

COMMON 2V OUT

LO HI

V SOURCE

TRIGGER LINK RS-232

DIGITAL I/O

HUMIDITY

TEMP

TYPE K

INTERLOCK

IEEE-488

2VDC MAX

OPTION SLOT

250VDC MAX

MADE IN

U.S.A

LINE RATING

50-60 Hz

100 VA MAX.

LINE

WARNING: NO INTERNAL OPERATOR SERVICABLE PARTS, SERVICE BY QUALIFIED PERSONNEL ONLY.

CAUTION: FOR CONTINUED PROTECTION AGAINST FIRE HAZARD, REPLACE FUSE WITH SAME TYPE AND RATING.

1250Vpk

PREAMP

OUT

1000VDC

MAX

FUSE

630mAT

315mAT

100V
120V
220V
240V

COMMON 2V OUT

LO HI

V SOURCE

TRIGGER LINK RS-232

DIGITAL I/O

HUMIDITY

TEMP

TYPE K

INTERLOCK

IEEE-488

2VDC MAX

Figure 3-1

Voltage measurements

6517B-900-01 Rev. A / Jun 2008 Return to Section T o pics 3-3

Guarding

Guarding should be used for high impedance (>109Ω) voltage measurements and for voltage
measurements when using long input cables. In a high impedance circuit, guarding greatly
reduces leakage currents. When using long input cables, guarding cancels the effects of cable
capacitance that can significantly slow down the measurement response time.

When GUARD is enabled, the INPUT triax connector is reconfigured to apply the guard potential
to the inner shell of the INPUT triax connector . With this configu ration, the COM MON ban ana jack
is used for input low.

Figure 3-1 shows both the guarded and unguarded configurations for the

INPUT connector.
Perform the following steps to enable or disable guard:

1. Press CONFIG and then V to display the volts configuration menu.

2. Use the and keys to place the cursor (blinking menu item) on GUARD and press

3. Place the cursor on the desired selection (OFF to disable or ON to enable) and press

4. Use the EXIT key to back out of the menu.

ENTER.

ENTER.

Section 3: Basic Measurements Model 6517B Electrometer User’s Manual

Red (HI)

Black (LO)

6517B

Shield

(Recommended

below 1mA)

I

s

Input low

connected

to shield

CAUTION: Maximum Input = 250V peak (DC to

60Hz) ; 10s per minute maximum on
mA ranges.

Measured

Current

Triax

Cable

OPTION SLOT

250VDC MAX

MADE IN

U.S.A

LINE RATING

50-60 Hz

100 VA MAX.

LINE

WARNING: NO INTERNAL OPERATOR SERVICABLE PARTS, SERVICE BY QUALIFIED PERSONNEL ONLY.

CAUTION: FOR CONTINUED PROTECTION AGAINST FIRE HAZARD, REPLACE FUSE WITH SAME TYPE AND RATING.

1250Vpk

PREAMP

OUT

1000VDC

MAX

FUSE

630mAT

315mAT

100V
120V
220V
240V

COMMON 2V OUT

LO HI

V SOURCE

TRIGGER LINK RS-232

DIGITAL I/O

HUMIDITY

TEMP

TYPE K

INTERLOCK

IEEE-488

2VDC MAX

Current measurements

Assuming “BENCH” reset conditions, the basic procedure is as follows:

1. With zero check enabled (“ZeroCheck” displayed), select the amps function by pressing I.
The Z-CHK key is used to enable or disable zero check.

2. To achie ve optimum accuracy for low current measur ements, zero correct the Model 6517 B.
To do this, use the RANGE key to select the lowest measurement range (20pA) and
press REL. With zero correct enabled, the REL indicator is on, and the message “ZCor” is
displayed.

3. Select a measurement range or use autoranging:

a. To automatically select the most sensitive range, enable autorange. The AUTO key

enables and disables autorange. When enabled, the AUTO ann unciator is on.

b. For manual ranging, use the RANGE and keys to select a measurement range

consistent with the expected current.

4. Connect the instrument to the current to be measured as shown in Figure 3-2.

CAUTION Do not apply more than 250V peak (DC to 60Hz; 10 seconds per minute

maximum on mA ranges), or instrument damage may occur.

5. Press Z-CHK to disable zero check and take a reading from the display. To disable zero

3-4 Return to Section Topics 6517B-900-01 Rev. A / Jun 2008

correct, enable zero check and then press REL.

Figure 3-2

Current measurements

Model 6517B Electrometer User’s Manual Section 3: Basic Measurements

Resistance measurement s

NOTE Accurate high resistance measurements require the use of a low-leakage test fixture.

The following procedure requires “BENCH” default settings (see Restoring bench defaults for
more information).

1. With zero check enabled (“ZeroCheck” displayed), select the ohms function by pressing R.

2. Select Auto V-Source ohms. In this mode, the V-Source is automatically set to a voltage
(nominally 40V or 400V) that optimizes measurement accuracy (see Auto V-Source for
more information). Note that default “BENCH” settings selects Manual V-Source ohms. In
this mode, you must manually set the V-Source level for the measurement. See Section 4
for details on using the V-Source.

WARNING Selecting Auto V-Source ohms may set the V-Source to 400V. Hazardous

voltages may be present on the output and guard terminals that could cause
personal injury or death.

3. Select a measurement range or use autoranging:

a. To automatically select the most sensitive range, enable autorange. The AUTO key

enables and disables autorange. When enabled, the AUTO ann unciator is on.

b. For manual ranging, use the RANGE and

consistent with the expected resistance.

4. Connect the Model 6517B to the test fixture. Generic connections are shown in Figure 3-3.
Note that this connection scheme requires that ammeter LO be internally connected to
V-Source LO (see Configuring V-Source for more information). For optimum accuracy,
leakage currents in the test fixture can be cancelled by performing REL on the current
component of the measurement (see Amps Rel for more info rmation).

5. Disable zero check by pressing OPER, then press Z-CHK to source voltage to the test
fixture device under test (DUT).

6. Take a reading from the display.

7. Place the V-Source in standby when finished by again pressing OPER.

keys to select a measurement range

6517B-900-01 Rev. A / Jun 2008 Return to Section T o pics 3-5

Section 3: Basic Measurements Model 6517B Electrometer User’s Manual

Red

Black

6517B

Shield

R

X

LO connected
to shield

Triax

Cable

Note: V-Source low internally

connected to electrometer low.

Test fixture

Measured

Resistance

OPTION SLOT

250VDC MAX

MADE IN

U.S.A

LINE RATING

50-60 Hz

100 VA MAX.

LINE

WARNING: NO INTERNAL OPERATOR SERVICABLE PARTS, SERVICE BY QUALIFIED PERSONNEL ONLY.

CAUTION: FOR CONTINUED PROTECTION AGAINST FIRE HAZARD, REPLACE FUSE WITH SAME TYPE AND RATING.

1250Vpk

PREAMP

OUT

1000VDC

MAX

FUSE

630mAT

315mAT

100V
120V
220V
240V

COMMON 2V OUT

LO HI

V SOURCE

TRIGGER LINK RS-232

DIGITAL I/O

HUMIDITY

TEMP

TYPE K

INTERLOCK

IEEE-488

2VDC MAX

WARNING Hazardous voltages may be present on the output and guard terminals. To

prevent electrical shock that could cause injury or death, NEVER make or
break connections to the Model 6517B while the output is on. Power off the
equipment from the front panel or disconnect the main power cord from the
rear of the Model 6517B before handling cables connected to the outputs.
Putting the equipment in standby mode does not guarantee that the outputs
are not powered if a hardware or software fault occurs.

Figure 3-3

Resistance measurements

1. Press CONFIG and then R to display the ohms configuration menu.

2. Use the and keys to place the cursor (blinking menu item) on VSOURCE and press

3. Place the cursor on AUTO (Auto V-Source ohms) or on MANUAL (Manual V-Sou rce ohms)

4. Use the EXIT key to back out of the menu.

1. With the V-Source in standby, remove the DUT from the test fixture.

2. Select the Amps (I) function and disable zero check. Make sure REL is disabled.

3-6 Return to Section Topics 6517B-900-01 Rev. A / Jun 2008

Auto V -Source

With Auto V-Source selected, the V-Source is automatically set for either 40V or 400V. For the
2MΩ through 200GΩ ranges, the V-Source is set to 40V. For the 2TΩ through 200TΩ ranges, a
400V test voltage is used. With Manual V-Source selected, you can manually set the voltage level
of the V-Source.

Perform the following steps to select the V-Source mode for the ohms function:

ENTER.

and press ENTER.

Amps Rel

Amps Rel is used to cancel leakage current in a test fixture for ohms measurements. This
procedure assumes that steps 1 through 4 o f the Resist ance Measurement s p rocedure have been
performed. Perform the following steps:

Model 6517B Electrometer User’s Manual Section 3: Basic Measurements

3. Place the V-Source in operate by pressing OPER. The VOLTAGE SOURCE OPERATE
indicator is on when in operate.

4. Select the lowest possible measurement range to display the leakage current in the test
fixture.

5. Enable relative (REL annunciator on) by pressing REL. This zeroes the display, canceling
the leakage current reading.

6. Press OPER to place the V-Source in standby and enable zero check.

7. Perform the following steps to establish the amps Rel value for the ohms function.

a. Press CONFIG and then R to display the ohms configuration menu.
b. Use the and keys, place the cursor (blinking menu item) on AMPSREL and press

ENTER.

c. Place the cursor on YES and press ENTER to use the amps Rel value for the ohms

measurement.

d. Use the EXIT key to back out of the menu.

8. Re-install the DUT in the test fixture.

9. Select the ohms (R) function and proceed to step 5 of the Resistance Measurement
procedure.

Resistivity measurements

NOTE The following procedure to measure resistivity (surface or volume) requires the use of the

Keithley Instruments Model 8009 Resistivity Test Fixture. Refer to the Model 8009 Instruction
Manual for details on using the test fixture.

The following procedure requires “BENCH” reset conditions (see Restoring bench defaults for
more information).

1. With zero check enabled (“ZeroCheck” displayed), select the ohms function by pressing R.

2. Select Auto V-Source ohms. In this mode, the V-Source is automatically set to a voltage
(nominally 40V or 400V) that optimizes measurement accuracy (see Auto V-Source for
more information). Note that “BENCH” reset conditions selects Manual V-Source ohms. In
this mode, you must manually set the V-Source level for the measurement (see Voltage

source for more information).

WARNING Selecting Auto V-Source ohms may set the V-Source to 400V. Hazardous

voltages may be present on the output and guard terminals that could cause
personal injury or death.

3. Select a measurement range or use autoranging:

a. To automatically select the most sensitive range, enable autorange. The AUTO key

enables and disables autorange. When enabled, the AUTO ann unciator is on.

b. For manual ranging, use the RANGE keys ( and ) to select a measuremen t range

consistent with the expected resistance.

4. Connect the Model 6517B to the Model 8009 test fixture as shown in Figure 3-4, and set the
switch on the test fixture to the desired measurement type (Surface or Volume).

5. Select the resistivity measurement mode as follows:

a. Press the CONFIG and then R to display the ohms configuration menu.
b. Use the cursor keys ( and ) to place the cursor (blinking menu ite m) on MEAS-TYPE

and press ENTER.

6517B-900-01 Rev. A / Jun 2008 Return to Section T o pics 3-7

Section 3: Basic Measurements Model 6517B Electrometer User’s Manual

c. Place th e cu rsor on RESISTIVITY and press ENTER.
d. Cursor position (SURFACE or VOLUME menu item blinking) indicates the selected

measurement type. The Model 6517B senses the switch position (surface or volume)
on the Model 8009 through the interlock cable, and automatically configures the
instrument for that measurement type:

• SURFACE: If Surface is the selected measurement type, you do not have to
proceed any further into the menu structure. Use the EXIT key to exit from the menu.

• VOLUME: If Volume is the selected measureme nt type, proceed as follows to
specify the thickness of the sample:

1) With the cursor on VOLUME, press ENTER to display the parameters menu for
volume.

2) Place the cursor on THICKNESS and press ENTER. The present thickness
parameter for the sample will be displayed.

3) Use the cursor keys ( and ) and the RANGE keys ( and ) to specify the
thickness (in millimeters) of the sample, and then press ENTER.

4) Use the EXIT key to back out of the menu structure.

6. Disable zero check by pressing Z-CHK.

7. Press OPER to source voltage to the DUT and, af ter an appropriate electrificatio n time, take

a reading from the display. Typically, an electrification time of 60 seconds is used.

8. Place the V-Source in standby when finished by again pressing OPER.

WARNING Hazardous voltages may be present on the output and guard terminals. To

prevent electrical shock that could cause injury or death, NEVER make or
break connections to the Model 6517B while the output is on. Power off the
equipment from the front panel or disconnect the main power cord from the
rear of the Model 6517B before handling cables connected to the outputs.
Putting the equipment in standby mode does not guarantee that the outputs
are not powered if a hardware or software fault occurs.

3-8 Return to Section Topics 6517B-900-01 Rev. A / Jun 2008

Model 6517B Electrometer User’s Manual Section 3: Basic Measurements

Warning: Connect of fixture to

safety earth ground using
safety ground wire.

Triax Cable

Interlock Cable

METER SOURCE

LID
INTERLOCK

TRIAX

250 MAX

HI-LO

MAX INPUT

1100V

!

Banana Plug

Cables

Model 8009

Model 6517B

OPTION SLOT

250VDC MAX

MADE IN

U.S.A

LINE RATING

50-60 Hz

100 VA MAX.

LINE

WARNING:

NO INTERNAL OPERATOR SERVICABLE PARTS, SERVICE BY QUALIFIED PERSONNEL ONLY.

CAUTION:

FOR CONTINUED PROTECTION AGAINST FIRE HAZARD, REPLACE FUSE WITH SAME TYPE AND RATING

.

1250Vpk

PREAMP

OUT

1000VDC

MAX

FUSE

630mAT

315mAT

100V
120V
220V
240V

COMMON 2V OUT

LO HI

V SOURCE

TRIGGER LINK RS-232

DIGITAL I/O

HUMIDITY

TEMP

TYPE K

INTERLOCK

IEEE-488

2VDC MAX

Figure 3-4

Resistivity measurements

6517B-900-01 Rev. A / Jun 2008 Return to Section T o pics 3-9

Charge measurements

Assuming “BENCH” reset conditions, the basic procedure is as follows:

1. With zero check enabled (“ZeroCheck” displayed), select the coulombs function by pressing
Q.

2. Select a measurement range or use autoranging:

a. To automatically select the most sensitive range, enable autorange. The AUTO key

b. For manual ranging, use the RANGE keys ( and ) to select a measuremen t range

3. Connect the test cable (see Figure 3-5) to the input of the Model 6517B. With the input

4. Connect the instrument to the charge to be measured as shown in Figure 3-5.

CAUTION Do not apply more than 250V peak (DC to 60Hz) or instrument damage may

5. Take a reading from the display. The reading can be reset to zero by enabling zero check. If

enables and disables autorange. When enabled, the AUTO ann unciator is on.

consistent with the expected charge reading.

open, disable zero check. If needed, press REL to zero the display.

occur.

you wish to have the reading reset to ze ro when a specified charge level is reached, enable
Auto Discharge as explained in the following paragraph.

Section 3: Basic Measurements Model 6517B Electrometer User’s Manual

Red (HI)

Black (LO)

6517B

Shield (Optional)

Q

s

Measured

Charge

Input low connected
to shield

Triax

Cable

OPTION SLOT

250VDC MAX

MADE IN

U.S.A

LINE RATING

50-60 Hz

100 VA MAX.

LIN

WARNING: NO INTERNAL OPERATOR SERVICABLE PARTS, SERVICE BY QUALIFIED PERSONNEL ONLY.

CAUTION: FOR CONTINUED PROTECTION AGAINST FIRE HAZARD, REPLACE FUSE WITH SAME TYPE AND RATING.

1250Vpk

PREAMP

OUT

1000VDC

MAX

FUSE

630mAT

315mAT

10
12
22
24

COMMON 2V OUT

LO HI

V SOURCE

TRIGGER LINK RS-232

DIGITAL I/O

HUMIDITY

TEMP

TYPE K

INTERLOCK

IEEE-488

2VDC MAX

Auto discharge

When enabled, Auto Discharge is used to automatically reset the charge reading to zero when the
specified charge level is reached. After the integrator resets, the charge measurement process
simply restarts at zero. Perform the fo llowing steps to enable or disable Auto Discharge.

1. Press the CONFIG key and then Q to display the coulombs configuration menu.

2. Use the cursor keys ( and ) to place the cursor (blinking menu item) on AUTO-
DISCHARGE and press ENTER.

3. Perform step a to enable Auto Discharge or perform step b to disable it:

a. Enable Auto Discharge: Place the cursor on ON and press ENTER to display the

present discharge level. Use the cursor keys ( and ) and the RANGE keys ( and

) to set a different discharge level and press ENTER.

b. Disable Auto Discharge: Place the cursor on OFF and press ENTER.

4. Use the EXIT key to exit from the menu.

Figure 3-5

Charge measurements

T emperature and humidity measurement s

The Model 6517B can make external temperature measurements from –25°C to 150°C using the
Keithley Instruments Model 6517-TP type K thermocouple (which is a supplied accessory).

The Model 6517B can make relative humidity measurements (0 to 100%) using the Keithley
Instruments Model 6517-RH humidity probe (which is available as an option).

Connections

The Model 6517-TP (thermocouple) and Model 6517-RH (humidity probe) connect to the rear
panel connectors labeled “TEMP TYPE K” and “HUMIDITY” as shown in

NOTE Keithley Instruments recommends that the thermocouple junction of the Model 6517-TP

be electrically insulated from ground and voltage potentials. Erroneous readings will
result if the thermocouple comes in contact with ground or a voltage potential.

3-10 Return to Section Topics 6517B-900-01 Rev. A / Jun 2008

Figure 3-6.

Model 6517B Electrometer User’s Manual Section 3: Basic Measurements

6517B

Model

6517-TP

Thermocouple

Model 6517-RH
Humidity Probe

OPTION SLOT

250VDC MAX

MADE IN

U.S.A

LINE RATING

50-60 Hz

100 VA MAX.

LINE

WARNING:

NO INTERNAL OPERATOR SERVICABLE PARTS, SERVICE BY QUALIFIED PERSONNEL ONLY.

CAUTION:

FOR CONTINUED PROTECTION AGAINST FIRE HAZARD, REPLACE FUSE WITH SAME TYPE AND RATING

.

1250Vpk

PREAMP

OUT

1000VDC

MAX

FUSE

630mAT

315mAT

100V
120V
220V
240V

COMMON 2V OUT

LO HI

V SOURCE

TRIGGER LINK RS-232

DIGITAL I/O

HUMIDITY

TEMP

TYPE K

INTERLOCK

IEEE-488

2VDC MAX

Figure 3-6

External temperature and humidity measurements

Measurement control

BENCH reset disables temperature and humidity measurements. These measurements can be
enabled from the front panel as follows:

1. Press MENU to display the main menu.

2. Use the cursor keys ( and ) to place the cursor (blinking menu item) on GENERAL and
press ENTER to display the menu items of the general menu.

3. Place the cursor on A/D-CONTROLS and press ENTER to display the A/D controls menu.

4. Place the cursor on DATA-STAMP and press ENTER. The present control state for
temperature and humidity will be displayed. OFF indicates that the measurement is
disabled, while ON indicates that the measurement is enabled.

5. To change the control state for temperature and humidity, place the cursor on the
appropriate menu item and use the the RANGE keys ( and ) to toggle the control
state. With the desired states for temperature and humidity displayed (ON or OFF), press
ENTER.

6. Use the EXIT key to back out of the menu.

T emperature unit s

All temperature readings by the Model 6517B can be displayed in Celsius (°C), Fahrenheit (°F), or
Kelvin (K). BENCH reset selects Celsius (°C) measurement units. Perform the following steps to
change units:

1. Press MENU to display the main menu.

2. Use the cursor keys ( and ) to place the cursor (blinking menu item) on GENERAL and

3. Place the cursor on DISPLAY and press ENTER to display the SET READING DISPLAY

4. Place the cursor on TEMP-UNITS and press ENTER. The blinking cursor indicates the

5. To change temperature units, place the cursor on the desired selection (°C, K, or °F) and

press ENTER to display the menu items of the general menu.

menu.

present temperature units selection.

press ENTER.

6. Use the EXIT key to back out of the menu.

6517B-900-01 Rev. A / Jun 2008 Return to Section T o pics 3-11

Section 3: Basic Measurements Model 6517B Electrometer User’s Manual

Display reading options

Temperature and humidity readings are available as multiple (NEXT) displays. Using multiple
displays, temperature and humidity readings can accompany each normal A/D measurement, and
they can be included as data storage elements for each reading stored in the buffer (

displays for more information).

External temperature and humidity are selected as data store e lements from the data store
configuration menu (

see Buffer (data store) for more information).

see Multiple

3-12 Return to Section Topics 6517B-900-01 Rev. A / Jun 2008

In this section:

Topic Page

Introduction ............................................................................................. 4-3

Multiple displays...................................................................................... 4-3

Menus ..................................................................................................... 4-5

Voltage source......................................................................................... 4-7

Relative ................................................................................................... 4-9

Section 4

Measurement Options

Navigating menus ........................................................................... 4-6

Connections.................................................................................... 4-7

Basic operation ............................................................................... 4-9

Configuring V-Source...................................................................... 4-9

Configuring rel................................................................................. 4-10

Zero check .............................................................................................. 4-10

Zero correct............................................................................................. 4-10

Triggering ................................................................................................ 4-10

Idle .................................................................................................. 4-11

Control sources............................................................................... 4-12

Device action .................................................................................. 4-12

Output trigger.................................................................................. 4-12

Counters ......................................................................................... 4-12

Bench default setup ........................................................................ 4-12

Speed...................................................................................................... 4-13

Configuring speed........................................................................... 4-13

Resolution ............................................................................................... 4-13

Configuring resolution..................................................................... 4-13

Filter ........................................................................................................ 4-13

Filter types ...................................................................................... 4-14

Filter modes.................................................................................... 4-14

Median filter .................................................................................... 4-14

Configuring filters............................................................................ 4-15

Buffer (data store) ................................................................................... 4-15

Storing readings.............................................................................. 4-15

Section 4: Measurement Options Model 6517B Electrometer User’s Manual

Topic Page

Math........................................................................................................ 4-16

Selecting and configuring math ...................................................... 4-17

Enabling math................................................................................. 4-18

Additional math operations............................................................. 4-18

Test sequences....................................................................................... 4-19

Configuring test sequences............................................................ 4-19

Connections.................................................................................... 4-20

Running a test ................................................................................ 4-21

Internal scanning .................................................................................... 4-21

Configure internal scanner.............................................................. 4-21

Perform the scan ............................................................................ 4-21

Close/open channels...................................................................... 4-22

External scanning ................................................................................... 4-22

Trigger connections........................................................................ 4-23

Configure external channels........................................................... 4-23

Perform the scan ............................................................................ 4-23

4-2 Return to Section Topics 6517B-900-01 Rev. A / Jun 2008

Model 6517B Electrometer User’s Manual Section 4: Measurement Options

6517B ELECTROMETER/HIGH RESISTANCE METER

Time, day, and date: This display provides the time, day of
week, and the date. The time, date, and format (12-hour or 24­hour) are set from the CLOCK option of the GENERAL MENU
(see Menus for more information).

6517B ELECTROMETER/HIGH RESISTANCE METER

Bar graph: The bar graph is a graphical representation of the
reading with zero at the left end. Each full segment of the bar
represents approximately 4% of the range limit.

Introduction

This section describes the deta ils of taking meas urements. Configurat ion options, triggers, reading
storage, and scanning are just a few of the topics discussed. You will find this information useful
whether operating the Model 6517B from the front panel or IEEE-488 bus.

Multiple displays

Each measurement function and some operations provide multiple displays by using the bottom
line of the front panel. These multiple displays provide multiple type measurements, show a
reading in a different form, or give additional information about the reading.

Multiple displays are summarized in this section. All the multiple displays are shown in Tabl e 4- 1.
The NEXT and PREV (previous) DISPLAY keys scroll through the multiple displays for the

selected function or operation. The multiple display mode can be cancelled by pressing and
holding in either key.

Table 4-1

Multiple displays by function

Function Next display

All Time, day, and date

Bar graph
Zero-centered bar graph
Maximum and minimum values
Relative and actual values
Calculated and actual values
Limits bar graph
Relative humidity and external temperature

Change from calibration temperature
Ohms (R) Source (V) and measure (I) values
Buffer Relative humidity and external temperature,

V-Source value, maximum reading,
minimum reading, average reading,
standard deviation, and print buffer data

6517B-900-01 Rev. A / Jun 2008 Return to Section T o pics 4-3

Section 4: Measurement Options Model 6517B Electrometer User’s Manual

6517B ELECTROMETER/HIGH RESISTANCE METER

Zero-centered bar graph: The zero-centered bar graph is a
graphical representation of the reading using plus/minus limits
with zero in the center. Each full segment represents 10% of the
limit.

6517B ELECTROMETER/HIGH RESISTANCE METER

Maximum and minimum: This display shows the maximum and
minimum readings that have occurred since the display was
entered. Maximum and minimum values are reset by pressing the
present function key or by leaving the display.

6517B ELECTROMETER/HIGH RESISTANCE METER

Relative and actual: This display is used with the REL (relative)
feature. While the top line shows the result of the rel operation,
the bottom line shows the actual (raw) reading.

6517B ELECTROMETER/HIGH RESISTANCE METER

Calculated and actual: This display is used with a math
calculation. While the top line provides the result of the math
calculation, the bottom line provides the raw reading.

6517B ELECTROMETER/HIGH RESISTANCE METER

Limits: This display provides the result of the limit test. The
graphical representation of the reading is shown on a
zero-centered bar graph. If the reading is between the specified
high and low limits, the PASS message is displayed. If the
reading is outside of the limits, the FAIL message is displayed.
Limits are set and enabled from the LIMITS option of the Main
Menu.

6517B ELECTROMETER/HIGH RESISTANCE METER

Relative humidity and external temperature: This display is
used to display the relative humidity and external temperature
readings. Note that the appropriate op tio n (se e Se ctio n 1 of the
Reference Manual) must be connected and enabled.

6517B ELECTROMETER/HIGH RESISTANCE METER

Change from cal temp: With temperature readings enabled, this
display indicates the difference between the present internal
temperature and the internal temperature when the instrument
was last calibrated.

4-4 Return to Section Topics 6517B-900-01 Rev. A / Jun 2008

Model 6517B Electrometer User’s Manual Section 4: Measurement Options

6517B ELECTROMETER/HIGH RESISTANCE METER

Measure/source: This display is used to display the measured
current and the V-Source level for ohms measurements.

6517B ELECTROMETER/HIGH RESISTANCE METER

6517B ELECTROMETER/HIGH RESISTANCE METER

Buffer: When in RECALL, there are seven displays for buffer
readings:

Relative humidity (RH) and temperature (ET)
V-Source value
Maximum reading (shown at left)
Minimum reading
Average reading (shown at left)
Standard deviation
Print buffer data

Menus

There are two basic menu structures used by the Mode l 6517 B: The ma in menu and the CONFIG
menus. The main menu accesses items for which ther e ar e no dedi cate d ke ys. The CONF IG
menus are used to configure measurement functions and other instrument operations.

Table 4-2 summarizes main menu selections. Table 4-3 and Table 4-4 show configuration settings

for the measurement functions and instrument operations.

Figure 4-1

Main menu display

Table 4-2

Main menu summary

Option Description

SAVESETUP Save and restore setups stored in memory, set power-on

defaults, and return unit to default conditions.
COMMUNICATION Select and configure interface (GPIB or RS-232).
CAL Calibrate the Model 6517B, perform offset adjustments, and

check calibration date.
TEST Perform self-tests (see Reference Manual).
LIMITS Configure unit to perform limit tests.
STATUS-MSG Enable/disable status message mode.
GENERAL Control output lines of digital output port, check serial

6517B-900-01 Rev. A / Jun 2008 Return to Section T o pics 4-5

number of unit and firmware revision levels, control

line-sync, limit control and data stamp, configure

timestamp, set reading display, and set real-time clock.

Section 4: Measurement Options Model 6517B Electrometer User’s Manual

Table 4-3

Configuration settings for each measurement function

Autorange

Function Speed Filter Resolution

Volts
Amps
Ohms

Coulombs

**Resistance or resistivity

**Auto or manual

•

•

•

•

•

•

•

•

•

•

•

•

limits

•

•

•

•

Table 4-4

Configuration settings for instrument operations

Option Description

CONFIG REL
CONFIG FILTER
CONFIG MATH

CONFIG TRIG
CONFIG SEQ
CONFIG STORE

CONFIG VOLTAGE SOURCE*
CONFIG CARD
CONFIG NEXT
CONFIG Z-CHK

Set rel (relative) value and enable.
Select and configure averaging, and median filters.
Select and configure math calculation: polynomial, percent, percent

deviation, ratio or log10.
Select and configure basic or advanced trigger model.
Select and configure test sequence.
Configure data store: set count, control, timestamp, elements and

display, and clear buffer.
Configure V-Source: range, V-limit, resistive I-limit, and meter connect.
Select and configure internal or external scanning.
Change the scale for the zero-center bar graph.
Set whether readings are shown in Zero-Check mode.

Damping Guard

••

•

•

External

feedback

Amps

rel

Meas
type*V-Source**

•• •

Auto

discharge

•

*To access the V-Source menu, press CONFIG and then any one of the VOLTAGE SOURCE keys.

Navigating menus

Use the following rules to navigate through the menu structures. Table 4-5 summarizes the front
panel keys used for navigation.

1. From the instrument’s normal state of displaying readings, you can:

• View a configuration menu by pressing CONFIG and then the desired function or
operation key.

• View the top level of the main menu by pressing the MENU key.

2. The unit is returned to the normal reading display by:

•Pressing EXIT or MENU from the top level of the main menu.

•Pressing EXIT from the top level of a configuration menu.

• Pressing a measurement function key from within a menu.

3. Pressing the ENTER key selects an item and, if further definition is needed, moves down

within the menu structure. Pressing the EXIT key backs up within a menu structure.

4. The cursor position is denoted by a blinking menu item or parameter. The cursor is moved

from one item to the next using the cursor keys ( and
the cursor, then press ENTER.

5. A displayed arrow ( or ) on the bottom line indicates there is more information or

additional menu items to select from. When is displayed, use the cursor key. The cursor
keys have an auto-repeat feature.

). To select an item, highlight it with

4-6 Return to Section Topics 6517B-900-01 Rev. A / Jun 2008

Model 6517B Electrometer User’s Manual Section 4: Measurement Options

6. A numeric parameter is keyed in by placing the cursor on the digit to be changed, and
pressing the RANGE keys ( and ) to increment or decrement the digit.

7. A change is only executed when the ENTER key is pressed. Entering an invalid parameter
generates an error, and the entry is ignored. Changes are also ignored if an EXIT is
performed.

8. The INFO key can be used anywhere in a menu to display helpful information messages
concerning operation. To cancel an information message and remain in the menu, press
INFO a second time, EXIT, or ENTER. Pressing a function key cancels INFO and the menu,
and returns the instrument to a reading displa y.

Table 4-5

Menu summary

Action Description

CONFIG-(function)

MENU

RANGE
RANGE
ENTER
EXIT

INFO

V olt age source

The built-in, bipolar , 1W voltag e source can output up to ±1000V. With the instrument in the normal
measurement mode, the programmed V-Source level is shown on the bottom line of the display.

Connections

or

Press the CONFIG key , then a function k ey (for exam ple,

V) to view the top level of a function configuration
menu.

Press the MENU key to view the top level of the main

menu; the operations that have no corresponding
key are included in the main menu.

Use the cursor keys to move the highlighted cursor

among menu selections, or the digits of a parameter
value, or change channels on the scanner.

Use the RANGE keys to increment and decrement digits

of a parameter value.
Accepts menu selection or data entry.
Cancels menu selection changes and returns to the

display of the previous menu level.
Displays context-sensitive information about the present

menu level; toggles information message on/off.

WARNING Hazardous voltages may be present on the output and guard terminals. To

prevent electrical shock that could cause injury or death, NEVER make or
break connections to the Model 6517B while the output is on. Power off the
equipment from the front panel or disconnect the main power cord from the
rear of the Model 6517B before handling cables connected to the outputs.
Putting the equipment in standby mode does not guarantee that the outputs
are not powered if a hardware or software fault occurs.

If used as an independent source, voltage is available at the V-SOURCE HI and LO terminals on
the rear panel (see

Figure 4-2). If used as an FVMI (force voltage measure current) source,

V-Source LO can be internally connected to ammeter LO from the METER CONNECT option of
the CONFIGURE V-SOURCE menu (

see Configuring V-Source for more information). Figure 4-3

shows the connections for this configuration.

6517B-900-01 Rev. A / Jun 2008 Return to Section T o pics 4-7

Section 4: Measurement Options Model 6517B Electrometer User’s Manual

HI

LO

V-Source Out

V-Source

R

L

LO HI

A. Basic Connections

B. Equivalent Circuit

R

L

INPUT

250V

HI

L

V SOURCE

OUT

Note: V-SOURCE LO connected to ammeter input

LO via METER-CONNECT option of
CONFIGURE V-SOURCE Menu.

R

V-Source

R

HI

HI

A

LO

Ammeter

Figure 4-2

Independent V-Source connections

Figure 4-3

FVMI connections

4-8 Return to Section Topics 6517B-900-01 Rev. A / Jun 2008

Model 6517B Electrometer User’s Manual Section 4: Measurement Options

Basic operation

Basic operation simply consists of setting the V-Source level and placing the V-Source in
OPERA TE to output the volt age. Other V-Source operations are p erformed from the CONF IGURE
V-SOURCE menu (
1000V), set voltage limit, select resistance current limit, and control the LO-to-LO connection
between the V-Source and the ammeter.

Setting V-Source level: The V-Source level is set with the instrument in the normal measurement
mode. The VOLTAGE SOURCE
adjust the voltage level. Pressing any one of these four keys will enable the V-Source edit mode.
The flashing digit on the V-Source display indicates the cursor position. Use the cursor keys to
place the cursor on the desired digit, and use the VOLTAGE SOURCE
the level. Polarity can be changed by placing the cursor on the polarity sign, and pressing

VOLTAGE SOURCE
Sourcing voltage: The displayed voltage level is applied to the output terminals when the

instrument is placed in operate by pressing the OPER key. In operate, the VOLTAGE SOURCE
OPERATE indicator is on. Pressing OPER a second time places the V-Source in standby.

see Configuring V-Source for more information) to select range (100V or

and keys, and the cursor keys ( and ) are used to

and keys to adjust

and .

Configuring V-Source

Perform the following steps to configure the V-Source:

1. Press the CONFIG key and one of the VOLTAGE SOURCE keys to display the following
configuration menu:

RANGE: Select the 100V range or 1000V range.
V-LIMIT: Control (on/off) and set a voltage limit (absolute value).
RESISTIVE LIMIT: Control (on/off) the resistive (1MΩ) current limit.
METER CONNECT: Control (on/off) the internal connection between V-Source LO and

ammeter LO.

2. Use the menu items to configure the V-Source. A menu item is selected by placing the
cursor on it and pressing ENTER. Options for a menu item are selected in the same way.
Parameter values are changed using the cursor keys
(

and ), and then pressing ENTER.

3. Use the EXIT key to back out of the menu structure.

( and ) and the RANGE keys

Relative

Rel subtracts a reference value from actual readings. When rel is en abled, the instrument use s the
present reading as a relative value. Subsequent readings will be the difference between the actual
input value and the rel value.

Actual Input – Reference = Displayed Reading

The rel (relative) operation is enabled by pressing the REL key (REL annunciator turns on).
Pressing REL a second time disables rel. You can also enter and enable a rel value from the
CONFIG-REL display.

A rel value can be established for each measurement fu nction. Th e state and value of rel for each
measurement function are saved when changing functions. Once a rel value is established for a
measurement function, the value is the same for all ranges.

6517B-900-01 Rev. A / Jun 2008 Return to Section T o pics 4-9

Section 4: Measurement Options Model 6517B Electrometer User’s Manual

Configuring rel

To check or change a rel value for a measurement function, perform the following steps:

1. Select the desired measurement function.

2. Press the CONFIG key and then the REL key to display the present rel value.

3. Use the cursor keys
and press ENTER. The instrument will return to the normal display state with rel enabled.

( and ) and the RANGE keys ( and ) to change the rel value

Zero check

With zero check enabled (“ZeroCheck” displayed), the input signal is routed to low through a high
impedance shunt. For volts, amps, and ohms measur ements, ze ro check should be enabled when
connecting or disconnecting input signals. For charge measurements, zero check should be
disabled. If left enabled, the charge will dissipate through the 10MΩ shunt.

The Z-CHK key is used to enable and disable zero check. To ensure proper operation, always
enable zero check before changing functions (V, I, R, or Q).

Zero correct

The Z-CHK and REL keys work together to cancel (zero correct) any internal offsets that might
upset accuracy for voltage and current measurement s.

Perform the following steps to zero correct the volts or amps function:

1. Select the V or I function.

2. Enable Zero Check.

3. Select the range that will be used for the measurement, or select the lowest range.

4. Press REL to zero correct the instrument. The REL indicator turns on and the “ZCor”
message is displayed. For the volts function, the “ZCor” message will not be displayed if
guard was already enabled (“Grd” displayed).

5. Press Z-CHK to disable zero check.

6. Readings can now be taken in the normal manner. The instrument will remain zeroed even
if the instrument is upranged. If downranged, re-zero the instrument.

7. To disable zero correct, first enable zero check and then press REL.

Triggering

The following overview is intended to acquaint you with triggering. For a complete explan ation, see
the Model 6517B Reference Manual. Tr iggering is configured from th e T rigger Configuration men u
which is accessed by pressing CONFIG and then TRIG.

There are two trigger modes for the Model 6517B; basic and advanced. These two trigger modes
are summarized by the simplified trigger models shown in
the drawings, the basic trigger model uses one laye r of ope ra tio n, while th e adva nced trigger
model uses three layers to provide more trigger options.

Figure 4-4 and Figure 4-5. As shown in

4-10 Return to Section Topics 6517B-900-01 Rev. A / Jun 2008

Model 6517B Electrometer User’s Manual Section 4: Measurement Options

Continuous

One
Shot

Output Trigger

Device

Action

Event

Detection

MODE

Idle

Arm

Layer

Scan

Layer

Measure

Layer

Yes

Yes

Yes

No

No

No

Arm

Count

Scan

Count

Measure

Count

Idle

Measure

Event

Device

Action

Output
Trigger

Arm

Event

Scan

Event

Another

Measure-

ment

?

Another

Scan

?

Another

Arm

?

Figure 4-4

Basic trigger model (simplified)

Figure 4-5

Advanced trigger model (simplified)

Idle

The instrument is in idle whenever it is not within one of the layers of the trigger model. When the

6517B-900-01 Rev. A / Jun 2008 Return to Section T o pics 4-11

Model 6517B is taken out of idle by pressing TRIG (or sending :INIT or :INIT:CONT ON over
the bus), the ARM indicator turns on and operation proceeds in the trigger model.

Section 4: Measurement Options Model 6517B Electrometer User’s Manual

Control sources

With advanced triggering and basic one-shot triggering, operation is controlled by control sources
which hold up operation until the programmed event occurs. Basic one-shot trigge ring uses one
control source, while advanced triggering uses three control sources. The control sources are
described below.

•Immediate: Event detection is immediately satisfied, allowing operat ion to continue.

•External: Event detection is satisfied when an input trigger via the EXT TRIG IN

connector is received.

•Manual: Event detection is satisfied by pressing the TRIG key.

•GPIB: Event detection is satisfied when a bus trigger (GET or *TRG) is received.

•TrigLink: Event detection is satisfied when an input trigger via the trigger link

connector is received. Not available for basic triggering.

•TIMER: Event detection is immediately satisfied on the initial pass through the layer.

Each subsequent detection is satisfied when the programmed timer interval
elapses. Not available in the Arm Layer of the advanced trigger model.

•Hold: With this selection, event detection is not satisfied by any of the above control

source events and operation is paused. Not available for basic triggering.

If continuous basic triggering is being used, then oper ation byp asses the control source (as shown
in

Figure 4-4) and performs a device action.

Device action

The primary device action is a measurement. However, the device action could include a function
change and a channel scan (if scanner is enabled). A channel is scanned (closed) before a
measurement is made. When scanning internal channels, the previous channel open s and the
next channel closes (break-before-make). Also included in the device action is the internal settling
time delay for the relay.

Output trigger

After each measurement (device action), an output trigger p ulse occurs and is available at the rear
panel of the Model 6517B. When used with an external scanner, each output trigger is used to
select the next channel in a scan (

Counters

All three layers of the advanced trigger model use programmable counters that allow operation to
return to or stay in the respective layer. For example, programming the measure layer counter to
infinite keeps operation in the measure layer. After each device action, operation loo ps back to the
trigger layer control source. A counter resets when operation loops back to a higher layer (or idle).

Bench default setup

The bench default setup selects advanced triggering and takes the Model 6517B out of idle, sets
the control sources of all layers to Immediate, and sets the measure layer counter to infinite. With
this trigger model setup, operation simply falls into the measure layer (and stays there) to make
continuous measurements.

see External scanning for more information).

4-12 Return to Section Topics 6517B-900-01 Rev. A / Jun 2008

Model 6517B Electrometer User’s Manual Section 4: Measurement Options

Speed

SPEED sets the integration time of the A/D converter, the period of time the input signal is
measured. The SPEED can be set for each measurement function. The integration time is
specified in parameters based on a number of power line cycles (NPLC), where one PL C for 60Hz
is 16.67msec and one PLC for 50Hz and 400Hz is 20msec.

In general, the fastest integration time (0.01 PLC) results in increased reading noise and less
usable resolution, while the slowest integration time (10 PLC) provides the best common-mode
and normal-mode rejection. In-between settings are a compromise between speed and noise.

Configuring speed

Each measurement function can have a unique integration time. Speed is set from the configure
function menu structures. The procedure is summarized as follows:

1. Press the CONFIG key and then the desired function key.

2. Use the cursor keys to select SPEED and press ENTER to display the following speed
options:

NORMAL: Sets the integration time to 1 PLC.
FAST: Sets the integration time to 0.01 PLC.
MEDIUM: Sets the integration time to 0.1 PLC.
HIACCURACY: Sets the integration time to 10 PLC.
SET-SPEED-EXACTLY: This options prompts you to enter a PLC value (0.01 to 10)
SET-BY-RESOLUTION: Automatically optimizes the integration time for the present

resolution setting (see Section 4 of the Reference Ma nu a l).

3. Use the menu items to configure speed. A menu item is selected by placing the cursor

(blinking menu item) on it and pressing ENTER. Parameter values are changed using the
cursor keys and the RANGE keys, and then pressing ENTER (see Menus for more
information on navigating through the menu structure).

For more information, see Section 4 of the Reference Manual.

Resolution

All functions can operate from 3½ to 6½ digits of resolution. Each function can ha ve a unique
resolution setting.

Configuring resolution

Perform the following steps to set resolution for a measurement function:

1. Press the CONFIG key and then the desired function key.

2. Using the cursor keys, select RESOLUTION and press ENTER to display the following

resolution options:
a. 3.5 to 6.5d: Select one of these options to set the display resolution.
b. AUTO: This option automatically optimizes the reso lut ion for th e pr es en t inte g ra tio n

time (speed) setting (see Section 5 of the Reference Manual).

3. Set resolution by placing the cursor on the menu option and pressing ENTER.

Filter

Filtering stabilizes noisy measurements. The Model 6517B uses a digital filter and a median filter.
When a filter is enabled by pressing FILTER (FILT annunciator turns on), the selected filter for that
measurement function is in effect. Pressing FILTER a second time disables the filter.

6517B-900-01 Rev. A / Jun 2008 Return to Section T o pics 4-13

Section 4: Measurement Options Model 6517B Electrometer User’s Manual

Value displayed

with filtering

Response with the noise
window turned on shifts
when the input signal moves
beyond the specified range

Response with
no noise window

Limits of the
user-specified
noise window

Input signal

Filter types

The Model 6517B has two types of digital filters: averaging and advanced. Both types are a simple
average of 1 to 100 reading conversions. The difference is a user-programmed “noise window” for
the advanced filter. The noise window (expressed as a percentage of range) allows a faster
response time to large signal step changes (see
Manual for complete information on filter types.

Figure 4-6

Filter response/noise window

Figure 4-6). See Section 9 of the Reference

Filter modes

There are two filter modes: moving or repeating. The moving filter uses a first-in, first-out stack.
When the stack becomes full, the measurement conversions are averaged, yielding a reading. For
each subsequent conversion, the new conversion is placed into the st ack, the oldest conver sion is
discarded, and a new reading is averaged.

For the repeating filter , the stack is filled and the conversions are averaged to yield a reading. The
stack is then cleared and the process starts over. See Section 9 of the Reference Manual for
complete information on filter modes.

Median filter

Median filtering uses the middlemost reading from a group of sample readings arranged in
ascending order. For example, assume the following readings:

They are then arranged in ascending order as follows:

The median (middlemost) reading from the above sample group is 3V.
The number of sample readings is determined by the specified rank as follows:

Sample readings = (2 × R) + 1
Where: R is the selected rank (1 to 5)

For example, a rank of 4 will use the last nine readings to determine the median;
(2 × 4) + 1 = 9.

Each new reading replaces the oldest reading, and the median is then determined from the
updated sample group of readings.

20V, 1V, 3V

1V, 3V, 20V

4-14 Return to Section Topics 6517B-900-01 Rev. A / Jun 2008

Model 6517B Electrometer User’s Manual Section 4: Measurement Options

Configuring filters

Each measurement function has its own filter configuration. Perform the following steps to
configure filter:

1. Select the measurement function.

2. Press CONFIG and then FILTER to display the following menu items:

AVERAGING:This item is used to control and configure the digital filter
MEDIAN:This item is used to control and configure the median filter

3. The menu structure for the two filters (averaging and median) is shown as follows:
a. AVERAGING (digital) filter options (TYPE is used to select the digital filter type):

•NONE: Disables the digital filter.

•AVERAGING: Selects the averaging filter and prompts you to enter
the number of readings to average (stack size).

•ADVANCED: Selects the advanced filter and prompts you to enter.
the number of readings to average (stack size); after entering the
stack size, you are then prompted to enter the noise tolerance level (0
to 100%).
AVERAGING-MODE is used to select the filter mode; either
MOVING or REPEAT.

b. MEDIAN filter options:

DISABLE: Disables the median filter.
ENABLE: Enables the median filter and prompts you to enter the range (1 to 5).

4. Use the menu items to configure a filter . A men u item is selected by placing the cursor on it

and pressing ENTER. Parameter values are changed using the cursor keys
the RANGE (

and ) keys, and then pressing ENTER.

( and ) and

Buffer (data store)

The Model 6517B has a buffer that can store from one to 15,706 readings. The actual number of
readings that can be stored in the buffer depends on how many optional data elements are
included for each reading (see Section 8 of the Re fe re nc e Ma nu a l).

The basic data elements include the re ading, units, reading number, and status (overflow or
underflow). In addition to these items, recalled data also includes sta tistical information such as
minimum, maximum, average, and standard deviation, which are part of the NEXT displays (

Multiple displays for more information).

Optional data elements include timest amp, humidity, external temperature, channel number (for
scanning) and the V-Source level.

Storing readings

The following procedure to store readings uses a typical data store configuration: a user-defined
number of readings will be stored in the buffer (fill-and-stop). All aspects of data store configuration
and operation are detailed in Section 8 of the Reference Manual.

1. Set up the instrument for the desired measurements (function or range).

2. Configure the data store as follows. A menu item is selected by placing the cursor on it an d

pressing ENTER. Parameters are changed using the RANGE (
pressing ENTER (see Menus for more information on navigating through the menu

structure).
a. Press CONFIG.
b. Press STORE.
c. Select CONTROL.

and ) keys and

see

6517B-900-01 Rev. A / Jun 2008 Return to Section T o pics 4-15

Section 4: Measurement Options Model 6517B Electrometer User’s Manual

Ya2()X2a1()Xa0()++=

Percent

Input Reading

Target Value

--------------------------------- -

100×=

PD

XY–()

Y

-----------------

100×=

d. Select FILL-AND-STOP.
e. Select ELEMENTS (y = enable, n = disable).
f. Select COUNT.
g. Select ENTER-COUNT (enter buffer size).
h. If you enabled the TIMESTAMP data element, continue on to configure the timestamp.

Otherwise, press EXIT to back out of the menu structure.
i. Select TIMESTAMP.
j. Select TYPE.
k. Select REAL-TIME.
l. Select FORMAT.
m. Select ABSOLUTE.
n. Use the EXIT key to back out of the menu structure.

3. Press STORE. The presently programmed buffer size (number of readings to store) is

displayed. If desired, use the cursor keys

( and ) and the RANGE keys ( and ) to

change the buffer size (incrementing the most significant digit sets the buffer size to
maximum).

4. Press ENTER to start storing readings. The asterisk (*) annunciator turns on to indicate a

data storage operation.

5. To recall stored readings, press RECALL. Use the RANGE keys (

and ) to scroll

through the buffer.

Math

The MA TH key let s you perform math operations on single readings and display the result. The six
math calculations that are configured from the CONFIGURE MATH menu structure are:

Polynomial:

Where: X is the normal display reading

a2, a1, and a0 are user-entered constants
Y is the displayed result

Percent:

Where: Input Reading is the normal display reading

Target Value is a user-entered constant
Percent is the displayed result

Percent Deviation:

Where: X is the normal display reading

Y is the user-entered reference value
PD is the displayed result (percent deviation)

4-16 Return to Section Topics 6517B-900-01 Rev. A / Jun 2008

Model 6517B Electrometer User’s Manual Section 4: Measurement Options

Deviation

XY–()

Y

-----------------=

Ratio

X
Y

---=

Deviation:

Where: X is the normal display reading

Y is the user-entered reference value
Deviation is the displayed result

Ratio:

Where: X is the normal display reading

Y is the user-entered reference value
Ratio is the displayed result

Log10 (logarithmic):

log

X = Y

10

Where: X is the input reading

Y is the logarithmic result

Selecting and configuring math

The procedure to select and configure a math calculation is summarized as follows:

1. Press CONFIG and then MATH to display the following math filter menu options:

NONE: Selects no calculation when the MATH key is pressed.
POLYNOMIAL: Selects the polynomial calculation and enters the constants (a2, a1,

and a0).

PERCENT: Selects the percent calculation and enters the target value (reference) .
% DEV: Selects the percent deviation calculation.
DEVIATION: Selects the deviation calculation.
RATIO: Selects the ratio calculation.
LOG10: Selects the logarithmic calculation.

2. Use the menu items to select and configure math. A menu item is selected by placing the
cursor on it and pressing ENTER. Parameter values are changed using the cursor keys

( and ) and the RANGE keys ( and ), and then pressing ENTER.

6517B-900-01 Rev. A / Jun 2008 Return to Section T o pics 4-17

Section 4: Measurement Options Model 6517B Electrometer User’s Manual

Math

Polynomial,

Percent,
Percent Deviation,
Ratio, Logarithmic

Value Displayed

Raw

Measurement

Multiple Displays

MAX, MIN

Enabling math

The selected math calculation is enabled by simply pressing the MATH key. When enabled, the
MATH annunciator turns on and the calculation type (NONE, POLY, %, or % DEV) is displayed.
Also, one of the following messages is briefly displayed:

Math Enabled
Display = NONE (reading)

Math Enabled
Display = POLY (reading)

Math Enabled
Display = % (reading)

Math Enabled
Display = % DEV (reading)

Math Enabled
Display = DEV (reading)

Math Enabled
Display = RATIO (reading)

Math Enabled
Display = LOG10 (reading)

Math is disabled by pressing MATH a second time.

Additional math operations

In addition to the math performed on single readings described above, the Model 6517B has these
math operations:

• Math performed on buffered readings (maximum and minimum values, average, and
standard deviation).

• Math performed on single readings as part of a pass/fail limits test.

Complete information on MATH is provided in Section 9 of the Reference Manual.

Figure 4-7

Combining math calculations

4-18 Return to Section Topics 6517B-900-01 Rev. A / Jun 2008

Model 6517B Electrometer User’s Manual Section 4: Measurement Options

T est sequences

The following information summarizes the built-in test sequences of the Model 6517B. Detailed
information on test sequences can be found in the Reference Manual.

Configuring test sequences

A test sequence is selected and configured from the CONFIGURE SEQUENCE menu as follows:

1. Press CONFIG and then SEQ to display the sequence configuration menu.

2. Place the cursor on APPLICATIONS and press ENTER. Select and configure a test from
the test sequence menu structure. To select a menu item, place the cursor on it and press
ENTER. To change a parameter value, use the cursor and RANGE keys (
press ENTER.

DEV-CHAR

Use to select a device characterization test:

DIODE: Diode leakage current test. Specify start voltage, stop voltage, step

voltage, and delay.

CAPACITOR: Capacitor leakage current test. Specify bias voltage, bias time, and

discharge time.

CABLE: Cable insulation resistance test. Specify bias voltage and bias time.
RESISTOR: Resistor voltage coefficient test. Specify source 1 voltage, delay 1,

source
2 voltage, and delay 2.

and ), and

RESISTIVITY

Use to select a resistivity test:

SURFACE: Surface resistivity test. Specify pre-discharge time, bias voltage, bias

time, measure voltage, measure time, and discharge time.

VOLUME: Volume resistivity time. Specify pre-discharge time, bias voltage, bias

time, measure voltage, measure time, and discharge time.

SIR

Surface insulation resistance test: Use to select the SIR test. Specify bias voltage, bias time,
measure voltage, and measure time.

SWEEP: Use to select a sweep test:
SQUARE-WAVE: Square wave sweep test. Specify high-level voltage, time at high

level, low-level voltage, time at low level, and cycle count.

STAIRCASE: Staircase sweep test. Specify start voltage, stop voltage, step

voltage, and step time.

3. Press EXIT to display the following menu:

CONFIGURE SEQUENCE

Applications Control

4. Place the cursor on CONTROL and press ENTER to display the control sources that can be
used to start the test. Place the cursor on the desired control source and press ENTER.

MANUAL: Pressing the TRIG key will start the test.
IMMEDIATE: Test will start immediately after it is armed.
LID-CLOSURE: Test will start when the lid of the Model 8009 test fixture is closed.
GPIB: Test will start when a bus trigger (*TRG or GET) is received by the Model

6517B.

6517B-900-01 Rev. A / Jun 2008 Return to Section T o pics 4-19

Section 4: Measurement Options Model 6517B Electrometer User’s Manual

HI

LO

6517B

Shield

A

+

-

6517B

Ammeter

7078-TRX

Cable

Note: Ammeter LO internally connected to

V-source LO (see V-Source).

HI

LO

HI

LO

Shield

DUT

DUT

6517B

V-Source

OPTION SLOT

250VDC MAX

MADE IN

U.S.A

LINE RATING

50-60 Hz

100 VA MAX.

WARNING:

NO INTERNAL OPERATOR SERVICABLE PARTS, SERVICE BY QUALIFIED PERSONNEL ONLY.

CAUTION:

FOR CONTINUED PROTECTION AGAINST FIRE HAZARD, REPLACE FUSE WITH SAME TYPE AND RATING

.

1250Vpk

PREAMP

OUT

1000VDC

MAX

FUSE

630mAT

315mAT

COMMON 2V OUT

LO HI

V SOURCE

TRIGGER LINK RS-232

DIGITAL I/O

HUMIDITY

TEMP

TYPE K

INTERLOCK

IEEE-488

2VDC MAX

EXTERNAL: Test will start when a trigger pulse (via EXT TRIG IN connector) is received

by the Model 6517B.

TRIGLINK: T est will start when a trigger pulse (via TRIG LINK connector) is received by

the Model 6517B. You will also be prompted to select the input line for the
trigger.

Connections

WARNING Hazardous voltages may be present on the output and guard terminals. To

Test sequences use the force voltage measure current (FVMI) technique as shown in Figure 4-8.
This connection scheme assumes that V-Source LO is internally connected to ammeter LO. This
connection is controlled from the METER CONNECT option of the CONFIGURE V-SOURCE
menu (see V-Source). Note that
all the tests. It is only intended to show the general concept. More specific connection diagrams
are provided in the Reference Manual.

prevent electrical shock that could cause injury or death, NEVER make or
break connections to the Model 6517B while the output is on. Power off the
equipment from the front panel or disconnect the main power cord from the
rear of the Model 6517B before handling cables connected to the outputs.
Putting the equipment in standby mode does not guarantee that the outputs
are not powered if a hardware or software fault occurs.

Figure 4-8 does not meet the exact connection requirements for

Figure 4-8

Typical FVMI connections

4-20 Return to Section Topics 6517B-900-01 Rev. A / Jun 2008

Model 6517B Electrometer User’s Manual Section 4: Measurement Options

Running a test

After a test is selected, configured, and connected, perform the following steps to run the test:

1. Press the SEQ key. The display message will indicate the selected test.

2. Press ENTER to arm the test. The blinking “SEQ” message will be displayed. The test will
start when the selected control source event occurs. Note that if the Immediate control
source is selected, the test will start as soon as it is armed. After the test is armed, the TRIG
key can be used to start the test regardless of which control source is selected.

3. When the test is finished, the “SEQ” display message is removed and the V-Source goes
into standby.

4. Use the RECALL key to read the data from the buffer. Use the RANGE keys (
to scroll through the data points.

an d )

Internal scanning

The Model 6517B can be used with a scanner card (such as the Keithley Instrume nt s Model 6521
or Model 6522) installed in the option slot of the instrument. This section provides basic
information for scanning internal channels. If the scanner card is not already installed, refer to the
scanner card instruction manual.

For complete information on scanning (internal and external), refer to the scanner card instruction
manuals. The scanner card must be installed in the option slot in order to access the menus to
configure and run an internal scan.

Configure internal scanner

Perform the following steps to configure an internal scan:

1. Press CONFIG and then CARD to display the scanning options (internal or external).

2. Place the cursor on INTERNAL and press ENTER to display the menu items for the internal
scanner.

3. Use the following menu structure to configure the internal scanner. To select a menu item,
place the cursor on it and press ENTER. Parameter values are changed using the cursor
keys

( and ) and the RANGE keys ( and ).

CHANNELS: Selecting this menu item displays the status (on or off) for each channel. ON
indicates that the channel will be included in the scan, while OFF indicates that the channel
will not be included in the scan. To change the status of a channel(s), place the cursor on
that channel and press a RANGE key (

SCAN-MODE: Use this menu item to set the scan mode. The VOLTAGE scan mode is
faster and can be used when break-before-make switching is not required.

VSRC-LIMIT: Use this menu item to enable (YES) or disable (NO) the 200V V-Source limit.
The ±200V limit is used to protect the scanner card. Note that a V-Source limit (0 to
±1000V) may also be set from the Configure V-Source menu (see V-SOURCE).

SETTLING-TIME: Use this menu item to set a settling time (0 to 999.999 seconds) for each
channel. Be sure to press ENTER after changing the time period.

4. Use the EXIT key to back out of the menu structure.

and ). When finished, press ENTER.

Perform the scan

Perform the following steps to scan internal channels. Note that menu items are selected by
placing the cursor on it and pressing ENTER. Parameter value s are changed using the cursor a nd
RANGE keys and pressing ENTER.

6517B-900-01 Rev. A / Jun 2008 Return to Section T o pics 4-21

Section 4: Measurement Options Model 6517B Electrometer User’s Manual

1. Set up the Model 6517B for the desired measurement (for example, function, range, filter.

2. Press CARD to display the internal scanner options (close channel or perform scan).

3. Select PERFORM-SCAN to display the scan types (internal or external).

4. Select INTERNAL to display the scan count; the scan count indicates the number of times
the scan will be repeated.

5. If desired, change the scan count and press ENTER.

6. You will then be asked if you wish to use the timer to provide a time interval between scans:

a. To use the timer, select YES. The present interval (in seconds) will be displayed. If

desired, change the interval. Press ENTER to continue.

b. If you do not wish to use the timer, select NO.

7. You will then be asked if you wish to store the readings in the buffer:

a. To use the buffer, select YES. A message indicating the number of readings that will be

stored in the buffer will be displayed. Press ENTER to continue.

b. If you do not wish to use the buffer, select NO.

8. With the message “Press ENTER to begin” displayed, press ENTER to start the scan.

9. After the scan is finished, the following options are available:

a. Recall data: If readings were stored in the buffer, select RECALL-DATA to display the

stored readings. Use the RANGE keys (

b. Scan again: If you wish to repeat the scan(s), select SCAN-AGAIN. Press ENTER to

start the scan.

c. Exit: To return to the normal measurement mode, select EXIT. Note that stored readings

can still be displayed by pressing the RECALL key.

and ) to scroll through the data points.

Close/open channels

Perform the following steps to open or close a channel on an internal scanner card:

1. Press the CARD key to display the internal scanner options (close channel or perform scan)

2. Place the cursor on CHANNEL-CLOSURES and press ENTER.

3. The following channel closure options are available:

a. T o close a channel, place the curs or on CLOSE-CHANNEL and press ENTER. Use the

RANGE keys (
ENTER. The number of the closed channel will be displayed along with the reading.

b. To open all channels on the scanner card, place the cursor on OPEN-ALL-CHANNELS

and press ENTER.

and ).to display the channel that you wish to close and press

External scanning

The Model 6517B can be used with a scanner card installed in an external scanning mainframe
(for example, the Keithley Instruments Model 7001 or 7002 Switch System). With the use of
external triggering, the Model 6517B can measure and store each scanned channel.

For complete information on scanning (internal and external), refer to Section 10 of the Re ference
Manual, and the switch system and scanner card instruction manual.

The following steps assume that the Model 6517B is set to the BENCH reset default co nditions
and the Model 7001/7002 is set to the RESET default conditions (
more information).

see Restoring bench default s for

4-22 Return to Section Topics 6517B-900-01 Rev. A / Jun 2008

Model 6517B Electrometer User’s Manual Section 4: Measurement Options

WARNING:

NO INTERNAL OPERATOR SERVICABLE PARTS,SERVICE BY QUALIFIED PERSONNEL ONLY.

CAUTION:

FOR CONTINUED PROTECTION AGAINST FIRE HAZARD,REPLACE FUSE WITH SAME TYPE AND RATI

MADE IN USA

Model 7001 or 7002 Switch System

6517B Electrometer

OUT

IN

Trigger

Link

Trigger Link Cable (8501)

OPTION SLOT

250VDC MAX

MADE IN

U.S.A

LINE RATING

50-60 Hz

100 VA MAX.

LINE

WARNING:

NO INTERNAL OPERATOR SERVICABLE PARTS, SERVICE BY QUALIFIED PERSONNEL ONLY.

CAUTION:

FOR CONTINUED PROTECTION AGAINST FIRE HAZARD, REPLACE FUSE WITH SAME TYPE AND RATING

.

1250Vpk

PREAMP

OUT

1000VDC

MAX

FUSE
630mAT

315mAT

100V
120V
220V
240V

COMMON 2V OUT

LO HI

V SOURCE

TRIGGER LINK RS-232

DIGITAL I/O

HUMIDITY

TEMP

TYPE K

INTERLOCK

IEEE-488

2VDC MAX

Trigger

Link

T rigger connections

Connect the Model 6517B to the switch system as shown in Figure 4-9. Detailed information on
triggers is provided in Section 7 of the Reference Manual.

Figure 4-9

Trigger connections using trigger link

Configure external channels

The scanner configuration menu is used to specify the numbe r of channels (extern al inputs) for the
scan. If a scanner card is installed in the option slot of the Model 6517B, use procedure A. If the
option slot is empty, use procedure B.

1. Press CONFIG and then CARD to display the scanner configuration menu.

2. Place the cursor on EXTERNAL and press ENTER.

3. You will then be prompted to enter the number of external inputs (channels) for the scan.

4. Press EXIT to return to the normal measurement display.

1. Press CONFIG and then CARD to display the scanner configuration menu.

2. You will then be prompted to enter the number of external inputs (channels) for the scan.

3. Press ENTER to return to the normal measurement display.

Perform the scan

1. On the Model 6517B, press the CARD key. If a scanner card is installed in the option slot of

a. Place the cursor on PERFORM-SCAN and press ENTER to display the scan types

b. Place the cursor on EXTERNAL and press ENTER.

2. On the Switch System, if not already done, reset the Model 7001/2 as follows:
a. Press MENU.

6517B-900-01 Rev. A / Jun 2008 Return to Section T o pics 4-23

Procedure A

Scanner installed in option slot of Model 6517B:

Use cursor keys

( and ) and the RANGE keys ( and ) to change the number (1 to

400). Press ENTER to continue.

Procedure B

Option slot of Model 6517B empty:

Use cursor keys

( and ) and the RANGE keys ( and ) to change the number (1 to

400).

Perform the following steps to scan external channels. Note that menu items are selected by
placing the cursor on it and pressing ENTER. A parameter value is changed by using the RANGE
keys (

and ). and pressing ENTER.

the Model 6517B, perform steps a and b. If the option slot is empty, proceed to step 2.

(internal or external).

Section 4: Measurement Options Model 6517B Electrometer User’s Manual

b. Select SAVESETUP.
c. Select RESET.
d. Select ENTER.
e. Select ENTER.
f. Use the EXIT key to back out of the menu structure.

3. On the Model 6517B, press ENTER to display the next message: “CONFIG EXT
SCANNER; set CHAN COUNT to infinite.”

4. On the Switch System, set the channel count to infinite as follows:

a. Press SCAN.
b. Select SELECT-CONTROL > NUMBER-OF-CHANS > CHAN-COUNT > INFINITE.

Note: Do not exit from the menu structure after selecting an infinite channel count.

5. On the Model 6517B, press ENTER to display the next message (“SELECT TRIG
SOURCE”), and select the appropriate trigger source. If using the Trigger Link, select
TRIGLINK. If you are instead using conventional external triggering, select EXTERNAL.
The “CONFIG EXT SCANNER” message to set channel spacing for the Switch System will
then be displayed.

6. On the Switch System, set channel spacing as follows. Note that the message on the Model
6517B tells you which channel spacing option to select:

a. Select CHANNEL-SPACING.
b. Select TRIGLINK or EXTERNAL.
c. Use the EXIT key to back out of the menu structure.

7. On the Model 6517B, press ENTER. The display will prompt you to define the scan list for
the Switch System.

8. Use the Switch System to define the scan list.

9. On the Model 6517B, press ENTER to display “CONFIG EXT SCANNER; STEP scanner to
first channel.”

10. On the Switch System, press STEP to close the first channel in the scan.

11. On the Model 6517B, press ENTER to display the currently programmed scan count. The
scan count specifies the number of scans to be performed. To change the scan count, use
the cursor keys

12. On the Model 6517B, you will be asked if you wish to use the scan timer. The timer is used
to provide a time interval between each scan. If you sele ct YES, enter the interval (in
seconds).

13. You will then be asked if you wish to store the readings in the buffer. If you select YES, a
message indicating the total number of readings to be stored in the buffer will be displayed.
Press ENTER to continue.

14. With the message “Press ENTER to begin” displayed, press ENTER to start the scan
process.

15. After the scan is completed, options to recall readings or repeat the scan will be displayed:

a. RECALL-DATA: Select this option to recall readings. Use the cursor keys and the

range keys to scroll through the buffer. When finished, press EXIT to return to the

post-scan options.—
b. SCAN-AGAIN: Use this option to repeat the scan.
c. EXIT: Use this option to disable the scan.

( and ) and the RANGE keys ( and ). Press ENTER to continue.

4-24 Return to Section Topics 6517B-900-01 Rev. A / Jun 2008

In this section:

Topic Page

Overview ................................................................................................. 5-2

Software support..................................................................................... 5-2

Remote interfaces................................................................................... 5-2

Common commands............................................................................... 5-5

SCPI commands ..................................................................................... 5-5

Section 5

Remote Operation

LabView driver ................................................................................ 5-2

IEEE-488 bus.................................................................................. 5-2

RS-232 interface............................................................................. 5-3

SCPI command syntax.................................................................... 5-6

SCPI signal-oriented commands..................................................... 5-8

SCPI subsystem commands........................................................... 5-8

Program examples.................................................................................. 5-13

Changing function and range.......................................................... 5-13

One-shot triggering ......................................................................... 5-14

Continuous triggering #1................................................................. 5-15

Continuous triggering #2................................................................. 5-15

Generating SRQ on buffer full......................................................... 5-16

Storing readings in the buffer.......................................................... 5-17

Taking readings with the scanner card............................................ 5-18

Test sequence: Staircase sweep..................................................... 5-19

Section 5: Remote Operation Model 6517B Electrometer User’s Manual

Overview

For remote operation, the Keithley Instruments Model 6517B can use the IEEE-488 interface or
the RS-232 interface. Common commands and Standard Commands for Programmable
Instrumentation (SCPI) can be used with either interface.

For IEEE-488 operation, you can select the device dependent command (DDC) language mode.
In this mode, you use DDCs instead of common commands and SCPI commands. This mode
allows you to use the Model 6517B as an easy replacement for the Model 617 Electrometer. The
6517B can use existing programs written for the Mod el 61 7 witho ut an y co de modi fic at ion s.
Appendix G of the Reference Manual lists the DDCs for the Model 6517B.

Software support

LabView driver

This driver allows you to use the Model 6517B with the National Instruments LabView package
and is free upon request. Contact the Keithley Instruments applications group for details at
1-888-KEITHLEY (1-888-534-8453) within the U.S. and Canada.

Remote interfaces

IEEE-488 bus

Standards

For remote operation, the Model 6517B can use the IEEE-488 bus for communication between
instrumentation and the controller (computer). The IEEE-488 bus is also known as the General
Purpose Interface Bus (GPIB).

In addition to conforming to the IEEE-488-1978 and IEEE-488.1-1987 standards, the Model 6517B
also conforms to the IEEE-488.2-1987 standard and the SCPI 199 4 standard. These two
standards allow most instrument operations to be performed with the use of comm on commands
and SCPI commands.

IEEE-488 bus connections

The Model 6517B is connected to the IEEE-488 bus using a cable terminated with standard
IEEE-488 connectors. Figure 5-1 shows a typical connection scheme for a multi-unit test system .
Note that connectors can be stacked to accommodate the parallel connection scheme.

To minimize interference caused by electromagnetic radiation, only use shielded IEEE-488 cables,
such as the Keithley Instruments Model 7007-1 and Model 7007-2.

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Model 6517B Electrometer User’s Manual Section 5: Remote Operation

Instrument

Computer

6517B

Instrument

Figure 5-1

IEEE-488 connections

Address and language selection

The Model 6517B is shipped from the factory with the IEEE-488 bus selected, the primary address
set to 27 and the SCPI language mode selected. The primar y address is displayed on po we r up if
the IEEE-488 bus is the selected interface.

Perform the following steps to select the IEEE-488 bus interface, check and change the primary
address, and check and change the language mode:

1. Press MENU to display the MAIN MENU.

2. Place the cursor on COMMUNICATION and press ENTER. The interface options (GPIB
and RS-232) are displayed.

3. Place the cursor on GPIB and press ENTER to select the IEEE-488 bus interface. If the
RS-232 interface was previously selected, the unit will exit from the MAIN MENU when you
select GPIB. In that event, repeat steps 1, 2, and 3 to continue in the menu structure.

4. Perform the following steps if you wish to check and change the primary address:

a. Place the cursor on ADDRESSABLE and press ENTER to display the addressable

menu items (ADDRESS and LANGUAGE).
b. Place the cursor on ADDRESS and press ENTER to display the primary address.
c. To change the address, use the cursor keys ( and ) and the RANGE keys

( and ) to display the desired address, then press ENTER. Each device on the

bus must have a unique address. Typically, the computer uses address 0 or 21.

5. Perform the following steps if you wish to check and change the language mode:
a. Place the cursor on LANGUAGE and press ENTER to display the language options

(SCPI or DDC). Cursor position indicates the present language mode.
b. Place the cursor on the desired language and press ENTER. Changing the language

mode causes the unit to exit from the MAIN MENU. If you did not change the language,

then use the EXIT key to back out of the menu structure.

RS-232 interface

RS-232 standard

For remote operation, the Model 6517B can use the RS-232 serial port for communication

6517B-900-01 Rev. A / Jun 2008 Return to Section T o pics 5-3

between instrumentation and the contro ller (computer). All commands, excep t DDCs, can be used
over this serial port. The serial port is based o n the electrica l and mechanical characteri stics of the
RS-232-C standard.

Section 5: Remote Operation Model 6517B Electrometer User’s Manual

RS-232 connections

The RS-232 serial port of the Model 6517B can b e connected to the serial port of a computer using
a standard, straight-through (not null modem) RS-232 cable terminated with DB-9 connectors. The
serial port is located on the rear panel of the Model 6517B and is labeled “RS232.”

If your computer uses a DB-25 connector for the RS-232 interface, you will need a cable or an
adapter with a DB-25 connector on one end and a DB-9 connector on the other end . Ag ain, make
sure you use a straight through (not null modem) cable.

Interface selection and configuration

Perform steps below to select, check, and change the RS-232 interface settings for the Model
6517B. The RS-232 settings (baud rate, data bits, parity , and stop bits) of the Model
match the RS-232 settings of the communications package for your computer.

1. Press MENU to display the MAIN MENU.

2. Place the cursor on COMMUNICATION and press ENTER. The interface options (GPIB
and RS-232) will then be displayed.

3. Place the cursor on RS-232 and press ENTER to select the RS-232 interface. If the GPIB
interface was previously selected, the unit will exit from the MAIN MENU when you select
RS-232. In that event, repeat steps 1, 2, and 3 to continue in the menu structure.

4. Perform the following steps if you wish to check and change the baud rate:

a. Place the cursor on BAUD and press ENTER to display the available baud rates.

Cursor position indicates the present baud rate setting. To retain the present baud rate
setting, press ENTER or EXIT.

b. To change the baud rate, place the cursor on the desired setting and press ENTER.

5. Perform the following steps if you wish to check and change the number of data bits:

a. Place the cursor on BITS and press ENTER to display the available number of data b its

(7 or 8). Cursor position indicates the present setting. To retain the present setting,
press ENTER or EXIT.

b. T o change the number of dat a bits, place the cursor on the alterna te selection and press

ENTER.

6. Perform the following steps if you wish to check and change parity:

a. Place the cursor on PARITY and press ENTER to display the parity options (NONE,

ODD or EVEN). Cursor position indicates the present setting. To retain the present
setting, press ENTER or EXIT.

b. To change parity, place the cursor on the desired selection and press ENTER.

7. Perform the following steps if you wish to check and change the number of stop bits:

a. Place the cursor on STOP and press ENTER to display the available number of stop

bits (1 or 2). Cursor position indicates the present setting. To retain the present setting,
press ENTER or EXIT.

b. T o change the number of stop bits, place the cursor on the alternate selection and press

ENTER.

8. Use the EXIT key to back out of the menu structure.

6517B must

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Model 6517B Electrometer User’s Manual Section 5: Remote Operation

Common commands

Common commands are common to all IEEE-488 devices on the bus. The following information
summarizes the common commands th at ar e us ed mo st often. For com p let e de tails, refer to
Section 11 of the Reference Manual.

*CLS (clear status)

Clears all event registers and Error Queue. After clearing an event register, you can monitor the
register for a bit to set, indicating that an event (such as the buffer becoming full) has occurred.

*RCL <NRf> (recall)

Returns the instrument to the instrument setup saved at the specified memory location. Example:
To recall the setup saved at memory location 0, send *RCL 0.

*RST (reset)

Returns the instrument to the *RST defaults and places the instrument in the idle state ( ARM
indicator off).

*SAV <NRf> (save)

Saves the instrument setup to the specified memory location (0 to 9). Example: To save the setup
to memory location 0, send *SAV 0.

*TRG (trigger)

When a trigger model control source is set for BUS, event detection is satisfied by sending this bus
trigger. F or example, if instrument oper ation is waiting at the measure (trigger) la yer control source
and it is programmed for BUS events, *TRG will provide the required event, resulting in a device
action (measurement).

*WAI (wait to continue)

This delay is used to allow the *TRG or an initiate command (:INIT or :INIT:CONT ON) to finish
before processing any further commands. An INITiate command is no t considered finished until
instrument operation returns to the idle state.

SCPI commands

In the Model 6517B, you are given access to control settings that are hidden on other instrument s.
Because the instrument has more control points available, it requires more commands than its
counterparts to perform comparable tasks. To accommodate this, the instrument incorporates the
SCPI command set.

This introduction to the SCPI command set has three goals:

• Describe the syntax of SCPI commands. Included are descriptions of short forms and
default nodes, which help reduce the amount of data sent to the instrument.

• Provide some simple programs to perform commonly used tasks.

• Describe the SCPI commands used in the example programs so you can modify the
programs to suit your needs.

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Section 5: Remote Operation Model 6517B Electrometer User’s Manual

:REFerence

SENSe1

:D ATA? :FUNCtion :VOLTage

[:DC]

:RANGe

:ACQuire[:UPPer] :AUTO :STATe

SCPI command syntax

Tree structure

SCPI commands are organized in a tree structure, similar to disk directories in computer operating
systems. Each subdirectory is called a subsystem . For ex am p le, part of the SENSe1 subsystem is
listed below and shown in

[SENSe[1]]

:DATA?
:FUNCtion <name>
:VOLTage

[:DC]

:RANGE

[:UPPer] <n>
:AUTO <Boolean> | ONCE

:REFerence <n>

:STATe <Boolean>
:ACQuire

Figure 5-2

Hierarchy of the example SENSe1 commands

Figure 5-2.

A command summary table is a way of documenting SCPI commands, but it does not show
complete command names. A complete command is formed by joining the components. For
example, the complete :STATe command in the example is:

SENSe1:VOLTage[:DC]:REFerence:STATe

Note that square brackets are not part of the command; they indicate optional parts of the
command.

This hierarchical approach permits the same command to be used many times. For example,
many subsystems contain a :STATe command, but each one is unique because the complete
command is unique. This is analogous to having a file named INDEX.TXT, for example, in each
directory of your computer's hard disk. Although the files have the same name, they are unique
because they are each in a different directory.

Long and short form commands

Every SCPI command has a short form, and most also have a long form. The notation used in
documentation shows the short form in upper case, with the remainde r of the name, which creates
the long form, shown in lower case. There are no intermediate forms of the command name. You
must send the exact short or long for m. However, you do not have to use the mixed capitalization.
The Model 6517B accepts commands in any combination of upper and lower case. For example,
all of the following are valid forms of the SENSe1:VOLTage[:DC]:REFerence command:

sense1:voltage[:dc]:reference:state
sens1:volt[:dc]:ref:stat
SENS1:volt[:DC]:rEFErENCe:STat

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Model 6517B Electrometer User’s Manual Section 5: Remote Operation

Query commands

With few exceptions, every SCPI command has a corresponding query. A command sets a control
point in the instrument; a query determines the present setting of the control point. The query is
simply the command name with a question mark (?) attached.

Some commands are actions rather than control point settings. These commands have no query
form. For example,

SENSe1:VOLTage[:DC]:REFerence:ACQuire

is an action command, not a setting, and so has no query form.
There are some queries that have no corresponding command. For example, SENSe1:DATA?

causes the instrument to return the latest reading. Of course, there is no corresponding command
to send a reading value to the instrument.

Default nodes

SCPI uses the concept of default nodes. Consider the example comma nd tree shown previously in

Figure 5-2. What is within square brackets is not necessary to send to the instrument, but the

instrument will accept it if you send it. Consider the :UPPer command, which sets the
measurement range. To set the Model 6517B to measure 15VDC, any of the following commands
works:

SENSe1:VOLTage[:DC]:RANGe:UPPer 15
SENSe:VOLTage[:DC]:RANGe:UPPer 15
SENSe1:VOLTage[:DC]:RANGe 15
VOLTage[:DC]:RANGe:UPPer 15
VOLTage[:DC]:RANGe 15

These are shown in long form, but short forms could also be used.

Command syntax

Notice in the preceding examples that there is no colon character at the beginning of the
commands. A leading colon instructs the Model 6517B to interpret the command starting at the
root (highest level) of the command tree. Since the Model 6517B also starts at the root each time
you send it a new command, the leading colon is not needed (although the instrument will accept it
if you send it).

You can send multiple commands in a single message. Separate the commands with a semicolon
character. When the Model 6517B encounters a command following a semicolon, it attempts to
interpret the command starting at the level of the previous command, unless you precede the
second command with a colon. For example, either of the following command strings programs
the Model 6517B to the 20V range and uses 5V as a relative v alue (wit h th e REFerence
commands):

volt[:dc]:rang 20;ref 5;ref:stat on
volt[:dc]:rang 20;:volt[:dc]:ref 5;:volt[:dc]:ref:stat on

The two command strings are treated identically by the Model 6517B. In the first string when the
instrument encounters ";ref 5", it notices the following:

• It is not the first command in the string

• There is no leading colon on the command

• The previous command was at the VOLTage[:DC] level
Therefore, it interprets the command as if it were at the VOLTage[:DC] level.

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Section 5: Remote Operation Model 6517B Electrometer User’s Manual

SCPI signal-oriented commands

Signal-oriented commands are used to acquire readings using a set of high-level instructions to
control the measurement process. The two most commonly used commands are :FETCh? and
:MEASure?.

Details on all signal-oriented commands are covered in Section 14 of the Reference Manual.

:FETCh?

This query command is used to request the latest post-processed reading. After sending this
command and addressing the Model 6517B to talk, the reading will be sent to the computer. This
command does not trigger a measurement, it simply requests the last available reading.

:MEASure[:<function>]?

In general, this command places the instrument in the “one-shot” measurement mode (ARM
indicator off), triggers a single measurement, and then performs a :FETCh? command.

If you include the measurement function with this command, the instrument will first go to the
specified function and then perform the one-shot measurement and query, as follows:

:MEASure? Currently selected function
:MEASure:VOLTage[:DC]? Volts function
:MEASure:CURRent[:DC]? Amps function
:MEASure:RESistance? Ohms function
:MEASure:CHARge? Coulombs function

SCPI subsystem commands

Detailed information on all SCPI commands is covered in Section 14 of the Reference manual. In
this section, only the commands used for basic operation are summarized.

Defaults

:SYSTem SYSTem subsystem

:PREset Set the 6517B to the system preset defaults. Some of the

:POSetup <name> Select power on setups: RST, PRESet, or SAV0 through SAV9.

Fresh readings

[:SENSe[1]] SENSe subsystem

:DATA:FRESh? Requests a new reading. This command will not request the

:CALCulate[1] CALCulate subsystem

:DATA:FRESh? Requests a new calculated reading. When CALC1 is enabled,

selected defaults include: volts, continuous triggers, normal
speed (1.0 PLC), and auto range.

Instrument will power up to the *RST or system present
defaults, or one of the *SAV0 – *SAV9 setups.

same reading twice. If a new reading has already been
triggered, this command will wait until the new reading is
available.

SENS:DATA:FRES? is the reading before calculation and
CALC:DATA:FRES? is the reading after calculation. When
CALC1 is disabled, the readings are the same.

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Model 6517B Electrometer User’s Manual Section 5: Remote Operation

Function configuration

[:SENSe[1]] SENSe subsystem

:FUNCtion <name> Select measurement function:

<name>='VOLTage[:DC]' Volts function
'CURRent[:DC]' Amps function
'RESistance' Ohms function
'CHARge' Coulombs function

:VOLTage[:DC] Path to configure volts:

:NPLC <n> Set speed: 0.01 to 10 PLC

:AUTO <b> Enable or disable auto NPLC

:RANGe Path to configure measurement range:

[:UPPer] <n> Specify expected reading to select range
:AUTO <n> Enable or disable auto range

:REFerence <n> Specify reference (rel): -210 to +210

:STATe <b> Enable or disable reference (rel)
:ACQuire Use input signal as reference (rel)

:DIGits <n> Specify measurement resolution

:AUTO <b> Enable or disable auto resolution

AVERage Path to control digital filter:

:TYPE <name> Select filter (NONE, SCALar or ADVanced)
:TCONtrol <name> Select averaging method (REPeat, or MOVing)
:COUNt <n> Specify filter count (1 to 100)
:ADVanced Path to configure advanced filter:

:NTOLerance <n> Specify noise tolerance (0 to 100%)

[:STATe] <b> Enable or disable digital filter

:MEDian Path to control median filter:

:RANK < n> Specify rank for filter (1 to 5)
[:STATe] <b> Enable or disable median filter

:GUARd <b> Enable or disable guard

:CURRent:DC Path to configure Amps:

(Volts commands)The same commands as Volts (except
:GUARd) apply

:DAMPing <b> Enable or disable damping

:RESistance Path to configure Ohms:

(Volts commands)The same commands as Volts (except
:GUARd) apply

[:AUTO] Path to configure Auto V-Source Ohms:

:RANGe Path to set measurement range:

[:UPPer] <n> Select range (0 to 100e18)
:AUTO <b> Enable or disable auto range

:MANual Path to configure Manual V-So urce Ohms:

:CRANge Path to set measurement range:

[:UPPer] <n> Select range (0 to 100e18)
:AUTO <b> Enable or disable auto range

:VSOurce Path to control the V-Source

[:AMPLitude] <n> Specify V-Source level (0 to 1000)
:RANGe <n> Set range; <100 = 100V range, >100 = 1000V range

:OPERate <b> Enable or disable V-Source output
:IREFerence <b> Enable or disable amps reference
:DAMPing <b> Enable or disable damping
:VSControl <name> Select ohms V-Source mode (MANual or AUTO)
:MSELect <name> Select ohms type (NORMal or RESistivity)

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Section 5: Remote Operation Model 6517B Electrometer User’s Manual

:RESistivity Path to configure resistivity

:STHickness <NRf> Volume: Specify sample thickness; 0.0001 to 99.9999

(mm)

:FSELect <name> Select test fixture (M8009 or USER)
:M8009 Path to query Model 8009 test fixture:

:RSWitch? Query switch setting (SURFace or VOLume)

:USER Path to configure user test fixture

:RSELect <name> Select test type (SURFace or VOLume)
:KSURface <NRf> Surface: Specify Ks; 0.001 to 999.999
:KVOLume <NRf> Volume: Specify Kv; 0.001 to 999.999

:CHARge Path to configure Coulombs:

(Volts commands)The same commands as Volts (except

:GUARd) apply

:ADIScharge Path to control auto discharge

:LEVel <NRf> Set level (-2.2e6 to 2.2e6)
[:STATe] <b> Enable or disable auto discharge

V -Source

:SOURce SOURce subsystem

:VOLTage <n> Specify V-Source level (0 to ±1000V)

:RANGe <n> Select range; <100 = 100V range, >100 = 1000V range
:LIMit Path for voltage limit:

[:AMPLitude] <n> Specify voltage limit; 0 to 1000 (V)
:STATe <b> Enable or disable limit

:MCONnect <b> Enable or disable V-Source LO to ammeter LO connection

:CURRent Path for current limit:

:RLIMit Path to control resistive current limit:

:STATe <b> Enable or disable resistive I-limit

:LIMit <b> Path to check current compliance:

[STATe]? <b> Query state of current compliance

Data store (Buffer)

:TRACe TRACe subsystem

:ELEMents <name> Select reading elements :TSTamp, HUMidity, CHANnel,

ETEMperature, VSOurce, NONE

:POINts <n> Specify buffer size
:FEED Path to control buffer:

:CONTrol <name> Select control mode and enable buffer: NEVer, NEXT,

ALWays, or PRETrigger

:DATA? Read all readings in buffer

Open/close channels and scan

:ROUTe ROUTe subsystem

:CLOSe <list> Close specified channel

:STATe? Query the closed channel
:OPEN <list> Open specified channel
:OPEN:ALL Open all channels
:SCAN Path to control scanning:

[:INTernal] <list> Specify internal scan list: 2 to 10 channels

:EXTernal <list> Specify external scan list: 1 to 400 channels

:SMEThod <name> Specify settling time for internal card; 0 to 99999.9999 (sec.)

:LSELect <name> Enable the specified scan: INTernal, EXTernal or NONE

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Model 6517B Electrometer User’s Manual Section 5: Remote Operation

T rigger model

Performing a system preset (:SYSTem:PRESet) configures the advanced trigger m odel for typical
instrument operation. After a system preset, many advanced operations can be accomplished
using the initiate commands, :ABORt, and the trigger (measure) layer commands.

:INITiate

[:IMMediate] Take the instrument out of idle (ARM indicator on)
:CONTinuous <b> Enable or disable continuous initiation

:ABORt Reset trigger system; instrument stays in idle if continuous

initiation is disabled (off)

:TRIGger Path to configure the advanced trigger layer:

:SOURce <name> Select control source: IMMediate, TIMer, MANual, BUS,

TLINk, EXTernal or HOLD
:TIMer <n> Set timer interval (sec): 0.001 to 9999999.999
:DELay <n> Set delay between measurements (sec) 0 to 999999.999

:SYSTem

:MACRo

:TRIGger Path to configure basic triggeri ng

[:EXECute] Select basi c triggering
:MODE <name> Specify trigger mode (CONTinuous or ONEShot)
:SOURce <name> Specify source (IMMediate, MANual, BUS,

EXTernal or TIMer)

:TIMer <n> Specify timer interval; 0.001 to 99999.999 (sec.)

T est sequences

:TSEQuence TSEQuence subsystem

:ARM Arms selected test sequence
:ABORt Stops a test sequence in process
:TYPE <name> Specify test; DLEakage, CLEakage, CIResistance,

RVCoefficient, SRESistivity, VRESistivity,

SIResistivity, SQSWeep, STSWeep

:TSOurce <name> Specify trigger source; MANual, IMMediate, BUS,

TLINk, EXTernal, LCLosure

:TLINe <NRf> Specify TLINK line; 1 to 6
DLEakage Diode leakage test path:

:STARt <NRf> Specify start voltage; -1000 to 1000
:STOP <NRf> Specify stop voltage; -1000 to 1000
:STEP <NRf> Specify step voltage; -1000 to 1000
:MDELay <NRf> Specify measure delay; 0 to 99999.9 s

:CLEakage Capacitor leakage test path:

:SVOLtage <NRf> Specify bias voltage (-1000 to 1000)
:STIMe <NRf> Specify bias time; 0 to 99999.9s
:DTIMe <NRf> Specify discharge time; 0 to 9999.9s

:CIResistance Cable insulation resistance test path:

:SVOLtage <NRf> Specify bias voltage; -1000 to 1000
:STIMe <NRf> Specify bias time; 0 to 99999.9s

:RVCoefficient Resistor voltage coefficient test path:

:SVOLtage[1] <NRf> Specify source voltage 1; -1000 to 1000
:MDELay[1] <NRf> Specify measure delay 1; 0 to 99999.0s
:SVOLtage2 <NRf> Specify source voltage 2; -1000 to 1000
:MDELay2 <NRf> Specify measure delay 2; 0 to 99999.9s

:SRESistivity Surface resistivity test path:

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Section 5: Remote Operation Model 6517B Electrometer User’s Manual

:PDTime <NRf> Specify pre-discharge time; 0 to 99999.9s
:SVOLtage <NRf> Specify bias voltage; -1000 to 1000
:STIMe <NRf> Specify bias time; 0 to 99999.9
:MVOLtage <NRf> Specify measure voltage; -1000 to 1000
:MTIMe <NRf> Specify measure time; 0 to 99999.9s
:DTIMe <NRf> Specify discharge time; 0 to 99999.9s

:VRESistivity Volume resistivity test path:

:PDTime <NRf> Specify pre-discharge time; 0 to 99999.9s
:SVOLtage <NRf> Specify bias voltage; -1000 to 1000
:STIMe <NRf> Specify bias time; 0 to 99999.9s
:MVOLtage <NRf> Specify measure voltage; -1000 to 1000
:MTIMe <NRf> Specify measure time; 0 to 99999.9s
:DTIMe <NRf> Specify discharge time; 0 to 99999.9s

:SIResistance Surface insulation resistance test path:

:SVOLtage <NRf> Specify bias voltage; -1000 to 1000
:STIMe <NRf> Specify bias time; 0 to 99999.9s
:MVOLtage <NRf> Specify measure voltage; -1000 to 1000
:MTIMe <NRf> Specify measure time; 0 to 99999.9s

:SQSWeep Square wave sweep test path:

:HLEVel <NRf> Specify high-level voltage; -1000 to 1000
:HTIMe <NRf> Specify high-level time; 0 to 99999.9s
:LLEVel <NRf> Specify low-level voltage; -1000 to 1000
:LTIMe <NRf> Specify low-level time; 0 to 99999.9s
:COUNt <NRf> Specify number cycles

:STSWeep Staircase sweep test path:

:STARt <NRf> Specify start voltage; -1000 to 1000
:STOP <NRf> Specify stop voltage; -1000 to 1000
:STEP <NRf> Specify step voltage; -1000 to 1000
:STIMe <NRf> Specify step time; 0 to 99999.9s

Status register

The status register structure of the Model 6517B lets you monitor and act upon numerous events
that occur. Many programming decisions can be made by monitoring the measurement event
register and the operation event register. See Section 14 of the User’s Manual for details of the
status registers.

:STATus STATus subsystem

:MEASurement Path for measurement status registers:

[:EVENt]? Use to read the measurement event register

:OPERation Path for operation status registers:

[:EVENt]? Use to read the operation event register

When an event register is read, a decimal value is sent to the computer. The binary equivalent
determines which bits in the register are set. For example, a decimal value of 33 indicates that bits
B0 and B5 are set. An event register is cleared when it is read. Sending *CLS clears all event
registers.

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Model 6517B Electrometer User’s Manual Section 5: Remote Operation

Some of the more useful bits of these event registers are summarized as follows:

Measurement event register Operation event register

Bit B0 set = reading overflow Bit B9 set = calculating
Bit B5 set = reading available Bit B10 set = idle
Bit B7 set = buffer available Bit B11 set = sequence test running
Bit B8 set = buffer half full
Bit B9 set = buffer full
Bit B14 set = V-source compliance

Program examples

All examples presume QuickBASIC version 4.5 or higher and a Keithley Instruments KPC-488.2 or
CEC IEEE-488 interface card with CEC driver version 2.11 or higher, with the Model 6517B at
address 27 on the IEEE-488 bus.

Changing function and range

The Model 6517B has independent controls for each of its measurement functions. This means,
for example, that autorange can be turned on for volts while leaving it off for amps.

Another difference is in the r ange comma nd p ara meter. In older instruments, a single number was
used to denote each range. The parameter of the SCPI RANGe command is given as “the
maximum value to measure.” The instrument interprets this para meter and goes to the appropriate
range. When you query the range with RANGe? the instrument sends back the full-scale value of it s
present range.

The following example program illustrates changing function and range. It sets the range for
several functions, then takes readings on each of those functions.

Note that the Model 6517B rounds the range parameter to an integer before choosing the
appropriate range. Sending VOLTage:DC:RANGe 20.45 will set the Model 6517B to the 20V
range.

'Example program that demonstrates changing function and range,
'taking readings on various functions
'For QuickBASIC 4.5 and KPC-488.2/CEC interface card

'Edit the following line to where the QuickBASIC
'libraries are on your computer
'$INCLUDE: 'c:\qb45\ieeeqb.bi'

'Initialize the interface as address 21
CALL initialize(21, 0)

'Reset the SENSe1 subsystem settings, along with the trigger
'model, each READ? will cause one trigger
CALL SEND(27, "*rst", status%)

'Set range for each function to measure
CALL SEND(27, "volt:dc:rang 10", status%)
CALL SEND(27, "curr:dc:rang 0.003", status%)
CALL SEND(27, "res:rang 10e6", status%)

'Switch to volts and take reading
CALL SEND(27, "func 'volt:dc';:read?", status%)
reading$ = SPACE$(80)
CALL ENTER(reading$, length%, 27, status%)

6517B-900-01 Rev. A / Jun 2008 Return to Section T o pics 5-13

Section 5: Remote Operation Model 6517B Electrometer User’s Manual

PRINT reading$

'Switch to current and take reading
CALL SEND(27, "func 'curr:dc';:read?", status%)
reading$ = SPACE$(80)
CALL ENTER(reading$, length%, 27, status%)
PRINT reading$

'Switch to 2-wire ohms and take reading
CALL SEND(27, "func 'res';:read?", status%)
reading$ = SPACE$(80)
CALL ENTER(reading$, length%, 27, status%)
PRINT reading$

One-shot triggering

Older instruments generally have two types of triggering: one-shot and continuous. In one-shot,
each activation of the selected trigger source causes one reading. In continuous, the instrum ent is
idle until the trigger source is activated, at which time it begins taking readings at a specified rate.
Typical trigger sources for non-SCPI instruments are:

• IEEE-488 talk

• IEEE-488 Group Execute Trigger (GET)

• “X” command

• External trigger (rear panel BNC)
Arming the instrument to respond to triggers is implicit in the non-SCPI instruments. Simply

sending a command to a non-SCPI instrument to change any of the trigger controls causes the
instrument to arm itself for triggers.

The SCPI trigger model implemented in the Model 6517B gives you:

• Explicit control over the trigger source (the TRIGger subsystem)

• A two-level control for arming the instrument for triggers

• A way to completely disable triggers
Changing any of the settings in the TRIGger subsystem does not automatically arm the Model

6517B for triggers.
The following program sets up the Model 6517B to take one reading each time it receives an

external trigger pulse.

'Example program that demonstrates one-shot external triggering
'For QuickBASIC 4.5 and KPC-488.2/CEC interface card.

'Edit the following line to where the QuickBASIC
'libraries are on your computer
'$INCLUDE: 'c:\qb45\ieeeqb.bi'

'Initialize the interface as address 21
CALL initialize(21, 0)

'Reset controls in INIT, ARM;LAY1, ARM:LAY2, and TRIG subsystems
'and put trigger model in IDLE state
CALL SEND(27, "*rst", status%)

CALL SEND(27, "trig:sour ext;coun inf", status%)

'start everything
CALL SEND(27, "init", status%)

5-14 Return to Section Topics 6517B-900-01 Rev. A / Jun 2008

Model 6517B Electrometer User’s Manual Section 5: Remote Operation

After the Model 6517B receives the INITiate command, it stops in the TRIGger layer of the
trigger model, waiting for a pulse on the external trigger jack. Each time a pulse arrives on the
external trigger jack, the Model 6517B takes one readin g. Because TRIGger:COUNt has been set
to INFinity, the trigger model never exits from the TRIGger layer. You can send the ABORt
command to put the trigger model in the idle state, disabling triggers until another INITiate
command is sent.

Continuous triggering #1

The following example program sets up th e Mo del 651 7B to take readings as fast as it can once it
receives an external trigger. The actual reading rate will depend upon other factors, such as A/D
integration time, autorange on/off, an d so on.

'Example program to demonstrate continuous triggering
'For QuickBASIC 4.5 and KPC-488.2/CEC interface card

'Edit the following line to where the QuickBASIC
'libraries are on your computer
'$INCLUDE: 'c:\qb45\ieeeqb.bi'

'Initialize the interface as address 21
CALL initialize(21, 0)

'Reset controls in INIT, ARM;LAY1, ARM:LAY2, and TRIG subsystems
'and put trigger model in IDLE state
CALL SEND(27, "*rst", status%)

'*RST sets TRIG:SOUR to IMM
CALL SEND(27, "arm:lay2:sour ext", status%)
CALL SEND(27, "trig:coun inf", status%)

'start everything
CALL SEND(27, "init", status%)

After the Model 6517B receives the INITiate command, it stops in ARM:LAYer2 of the trigger
model, waiting for a pulse on the external trigger jack. After the external trigger signal occurs, the
Model 6517B moves to the TRIGger layer. Since TRIGger:SOURce is set to IMMediate, a
reading is triggered immediately, with a subsequent reading triggered as soon as the previous one
is finished.

Continuous triggering #2

The following example program sets up the Model 6517B to take readings continuously after an
external trigger is received. The trigger rate is set to one reading every 50ms.

'Example program to demonstrate continuous triggering
'at a specified rate
'For QuickBASIC 4.5 and KPC-488.2/CEC interface card

'Edit the following line to where the QuickBASIC
'libraries are on your computer
'$INCLUDE: 'c:\qb45\ieeeqb.bi'

'Initialize the interface as address 21
CALL initialize(21, 0)

'Reset controls in INIT, ARM;LAY1, ARM:LAY2, and TRIG subsystems
'and put trigger model in IDLE state
CALL SEND(27, "*rst", status%)

6517B-900-01 Rev. A / Jun 2008 Return to Section T o pics 5-15

Section 5: Remote Operation Model 6517B Electrometer User’s Manual

'*RST sets TRIG:SOUR to IMM
CALL SEND(27, "arm:lay2:sour ext", status%)
CALL SEND(27, "trig:coun inf;sour tim;tim .05", status%)

'start everything
CALL SEND(27, "init", status%)

After the Model 6517B receives the INITiate command, it stops in ARM:LAYer2 of the trigger
model, waiting for a pulse on the external trigger jack. After the external trigger signal occurs, the
Model 6517B moves to the TRIGger layer. Since TRIGger:SOURce is set to TIMer, a reading is
triggered immediately, with a subsequent reading every 50ms. Because TRIGger:COUNt has
been set to infinity, the tri gger model never exits from the TRIGger layer.

Generating SRQ on buffer full

When your program must wait until the Model 6517B has completed an operation, it is more
efficient to program the Model 6517B to assert the IEEE-488 SRQ line when it is finished, rather
than repeatedly serial polling the instrument. An IEEE-488 controller will typically address, then
unaddress the instrument to talk each time it performs a serial poll. Repeated polling of the Model
6517B will generally reduce its overall reading throughput. Therefore, use the srq%() function
call.

The Model 6517B provides a status bit for nearly every operation it performs. It can be
programmed to assert the IEEE-488 SRQ line whenever a status bit becomes true or false. The
IEEE-488 controller (your computer) can examine the state of the SRQ line without performing a
serial poll, thereby detecting when the 6517B has completed its task without interrupting it in the
process.

The following example program segment sets up the Model 6517B to assert SRQ when the
reading buffer has completely filled, then arms the reading buffer, initiates readings, and waits for
the Model 6517B to indicate that the buffer is full.

This is not a complete program. Not shown are the commands to configure the trigger model an d
the reading buffer (see the next example). The example shown here can be modified for any event
in the Model 6517B status reporting system.

'Reset STATus subsystem (not affected by *RST)
CALL SEND(27, "stat:pres;*cls", status%)

CALL SEND(27, "stat:meas:enab 512", status%)

'Enable BFL
CALL SEND(27, "*sre 1", status%)'enable MSB
CALL SEND(27, "trac:feed:cont next", status%)

'Start everything
CALL SEND(27, "init", status%)

WaitSRQ:
IF (NOT(srq%)) THEN GOTO WaitSRQ
CALL SPOLL(27, poll%, status%)
IF (poll% AND 64)=0 THEN GOTO WaitSRQ

Notice that after the program has detected an asserted SRQ line, it serial polls the Model 6517B to
determine if it is the device requesting service. This is necessary for two reasons:

• Serial polling the Model 6517B causes it to quit asserting the SRQ line

• In test systems that have more than one IEEE-488 instrument programmed to assert SRQ,

your program must determine which instrument is actually requesting service

5-16 Return to Section Topics 6517B-900-01 Rev. A / Jun 2008

Model 6517B Electrometer User’s Manual Section 5: Remote Operation

Once an event register has caused a service request, it cannot cause another service request until
you clear it by reading it (in this case using STATus:MEASurement[:EVENt]?) or by sending the
*CLS command.

Storing readings in the buffer

The reading buffer in the Model 6517B is flexible and capable. It has three controls, which are
found in the TRACe subsystem. There are comma nd s to co nt ro l:

• The size of the buffer (in readings):

TRACe:POINts <NRf>

• Whether or not extra data is stored with each reading (for example, channel number, time­stamp); storing extra data reduces the maximum size of the buffer:

TRACe:ELEMents <name> Specify additional reading elem en ts; TSTamp,

HUMidity, CHANnel, ETEMperature, VSOurce,

or NONE

• Select buffer control mode:

TRACe:FEED:CONTrol NEVer Immediately stop storing readings
TRACe:FEED:CONTrol NEXT Start now, stop when buffer is full
TRACe:FEED:CONTrol ALWays Start now, never stop
TRACe:FEED:CONTrol PRETrigger Start now, stop when pretrigger is satisfied

The following example program sets up the Model 6517B to take 20 readings as fast as it can into
the buffer, then reads the data back after the buffer has filled. The readings will be stored with the
timestamp and other information, but the program reads back only the reading values and
timestamp.

'Example program to demonstrate the reading buffer
'For QuickBASIC 4.5 and KPC-488.2/CEC interface card

'Edit the following line to where the QuickBASIC
'libraries are on your computer
'$INCLUDE: 'c:\qb45\ieeeqb.bi'

'Initialize the interface as address 21
CALL initialize(21, 0)

'Reset controls in INIT, ARM;LAY1, ARM:LAY2, and TRIG subsystems
'and put trigger model in IDLE state
CALL SEND(27, "*rst", status%)

'Reset STATus subsystem (not affected by *RST)
CALL SEND(27, "stat:pres;*cls", status%)
CALL SEND(27, "stat:meas:enab 512", status%)'enable BFL
CALL SEND(27, "*sre 1", status%)'enable MSB
CALL SEND(27, "trig:coun 20", status%)

'TRACe subsystem is not affected by *RST
CALL SEND(27, "trac:poin 20;elem none", status%)
CALL SEND(27, "trac:feed:cont next", status%)

'Start everything
CALL SEND(27, "init", status%)

'Initialize reading$ while the 6517B is busy taking readings
reading$ = SPACE$(4000)

WaitSRQ:

6517B-900-01 Rev. A / Jun 2008 Return to Section T o pics 5-17

Section 5: Remote Operation Model 6517B Electrometer User’s Manual

IF (NOT(srq%) THEN GOTO WaitSRQ
CALL SPOLL(27, poll%, status%)
IF (poll% AND 64)=0 THEN GOTO WaitSRQ

CALL SEND(27, "trac:data?", status%)
CALL ENTER(reading$, length%, 27, status%)
PRINT reading$

T aking readings with the scanner card

The Model 6521 and Model 6522 are optional 10-channel scanner cards for the Model 6517B.
Only one channel can be closed at a time. If you close a channel while another is already closed,
the first one opens with break-before-make operation.

You can use the scanner card two ways. One is to issue a command to close a particular channel
before sending other commands to take readings. The other way is to program the scan list, and
let the meter take care of closing a channel before taking a reading.

The following example program measures voltage on channel 1, amps on channel 2, and
resistance on channel 3, using the ROUTe:CLOSe command.

'Example program to demonstrate taking readings on different
'scanner channels
'For QuickBASIC 4.5 and KPC-488.2/CEC interface card

'Edit the following line to where the QuickBASIC
'libraries are on your computer
'$INCLUDE: 'c:\qb45\ieeeqb.bi'

'Initialize the interface as address 21
CALL initialize(21, 0)

'Reset controls in INIT, ARM;LAY1, ARM:LAY2, and TRIG subsystems
'and put trigger model in IDLE state, set function to volts
CALL SEND(27, "*rst", status%)

'Close channel 1, take voltage reading
CALL SEND(27, "rout:clos (@1);:read?", status%)
reading$ = SPACE$(80)
CALL ENTER(reading$, length%, 27, status%)
PRINT reading$

'Close channel 2, take current reading
CALL SEND(27, "func 'curr:dc'", status%)
CALL SEND(27, "rout:clos (@2);:read?", status%)
reading$ = SPACE$(80)
CALL ENTER(reading$, length%, 27, status%)
PRINT reading$

'Close channel 3, take ohms reading
CALL SEND(27, "func 'res'", status%)
CALL SEND(27, "rout:clos (@3);:read?", status%)
reading$ = SPACE$(80)
CALL ENTER(reading$, length%, 27, status%)
PRINT reading$

The following example program sets up the Model 6517B usin g a scan list to measure DC volt age
on channels 1, 2, and 3. The meter takes ten sets of readings, with each set spaced 15 seconds
apart, and each of the three readings in each group taken as fast as possible. The Model 6517B

5-18 Return to Section Topics 6517B-900-01 Rev. A / Jun 2008

Model 6517B Electrometer User’s Manual Section 5: Remote Operation

stores the readings in the buffer, and asserts SRQ when the buffer is full. The program waits for
the SRQ, then reads the readings from the buffer.

'Example program to demonstrate using the scan list
'For QuickBASIC 4.5 and KPC-488.2/CEC interface card

'Edit the following line to where the QuickBASIC
'libraries are on your computer
'$INCLUDE: 'c:\qb45\ieeeqb.bi'

'Initialize the interface as address 21
CALL initialize(21, 0)

'Reset controls in INIT, ARM;LAY1, ARM:LAY2, and TRIG subsystems
'and put trigger model in IDLE state, set function to DCV
CALL SEND(27, "*rst", status%)

'Reset STATus subsystem (not affected by *RST)
CALL SEND(27, "stat:pres;*cls", status%)

CALL SEND(27, "stat:meas:enab 512", status%) 'enable BFL
CALL SEND(27, "*sre 1", status%) 'enable MSB

'*RST sets TRIG:SOUR to IMM
CALL SEND(27, "trig:coun 3", status%)
CALL SEND(27, "arm:lay2:sour tim;tim 15", status%)
CALL SEND(27, "arm:lay2:coun 10", status%)

'TRACe subsystem is not affected by *RST
CALL SEND(27, "trac:poin 30;elem none", status%)
CALL SEND(27, "trac:feed sens1;feed:coun next", status%)
' now the buffer is armed

CALL SEND(27, "rout:scan (@1:3)", status%)
CALL SEND(27, "rout:lsel init", status%)

'Start everything
CALL SEND(27, "init", status%)

'Initialize reading$ while the 6517B is busy taking readings
reading$ = SPACE$(2500)

WaitSRQ:
IF (NOT(srq%()) THEN GOTO WaitSRQ
CALL SPOLL(27, poll%, status%)
IF (poll% AND 64)=0 THEN GOTO WaitSRQ

CALL SEND(27, "form:elem read,time,chan", status%)
CALL SEND(27, "trac:data?, status%)
CALL ENTER(reading$, length%, 27, status%)
PRINT reading$

T est sequence: St aircase sweep

The following program performs a staircase sweep. Using the source voltage measure current
(FVMI) method, this test will measure the current through a DUT at eleven voltage steps (0V
through 10V) (see

Figure 4-3). The eleven readings are stored in the buffer and displayed on the

computer CRT at the conclusion of the test.

'Quick Basic 4.5, KPC-488.2/CEC card

6517B-900-01 Rev. A / Jun 2008 Return to Section T o pics 5-19

Section 5: Remote Operation Model 6517B Electrometer User’s Manual

'
'$INCLUDE: 'ieeeqb.bi'

CALL initialize(21, 0)
CLS
CALL send(27, "*rst", status%)
CALL send(27, "*CLS", status%)
CALL spoll(27, KIspoll%, status%)

'Configure status model to SRQ on Buffer Full:

CALL send(27, "stat:meas:enab 512", status%)
CALL SEND(27, "*sre 1", status%)

'Select autoranging amps:

CALL send(27, ":SENS:FUNC 'CURR'", status%)
CALL send(27, ":SENS:CURR:RANG:AUTO ON", status%)

'Configure Staircase Sweep from 0V to 10V in 1V steps:

CALL send(27, ":TSEQ:TYPE STSW", status%)
CALL send(27, ":TSEQ:STSW:STAR 0", status%)
CALL send(27, ":TSEQ:STSW:STOP 10", status%)
CALL send(27, ":TSEQ:STSW:STEP 1", status%)
CALL send(27, ":TSEQ:STSW:STIM 0.3", status%)
CALL send(27, ":TSEQ:TSO imm", status%)

'Wait for commands to complete processing:

DATA1$ = SPACE$(600)
CALL send(27, "*OPC?", status%)
CALL enter(DATA1$, length%, 27, status%)

' Start Test Sequence:

CALL send(27, ":TSEQ:ARM", status%)

'Wait for SRQ (buffer full):

WaitSRQ
IF (NOT (srq%)) THEN GOTO WaitSRQ
CALL spoll(27, poll%, status%)
If (poll% AND 64) = 0 THEN GOTO WaitSRQ

'Dump buffer readings to computer CRT:

CALL send(27, ":TRACE:DATA?", status%)
CALL enter(DATA1$, length%, 27, status%)
A = 1
FOR I = 1 TO 11

r$ = MID$(DATA!$, A, 13)
PRINT r$
A = A + 14

NEXT I

END

5-20 Return to Section Topics 6517B-900-01 Rev. A / Jun 2008

Index

A

Accessories ..............................................1-3

Addenda, manual .................................. ...1-3

Additional math operations .....................4-18

Amps Rel ..................................................3-6

Annunciators ............................................2-2

Auto discharge .......................................3-10

Auto V-source ...........................................3-6

B

Basic operation .........................................4-9

Buffer (Data Store) .................................4-15

C

Cables and adapters ................................1-3

Capabilities ...............................................1-2

Changing function and range .................5-13

Changing functions ...................................3-2

Charge measurements .............................3-9

Close/Open channels .............................4-22

Common commands ................................5-5

Configure external channels ...................4-23

Configure internal scanner .....................4-21

Configure resolution ...............................4-13

Configuring filters ...................................4-15

Configuring rel ........................................4-10

Configuring speed ..................................4-13

Configuring V-Source ...............................4-9

Connections ........................ 3-10, 4-7, 4-20

Connectors

2V Analog Output .............................2-5

Chassis Ground ...............................2-5

Common ...........................................2-5

Digital I/O .........................................2-5

Guard ...............................................2-5

Humidity ...........................................2-5

IEEE-488 ..........................................2-5

Input .................................................2-4

Interlock ............................................2-5

Preamp Out ......................................2-4

RS-232 .............................................2-5

Temp Type K ....................................2-5

Trig Link ...........................................2-5

V-Source HI and LO .........................2-5

Continuous triggering #1 ........................5-15

Continuous triggering #2 ........................5-15

Control sources ......................................4-12

Counters .................................................4-12

Current measurements .............................3-4

D

Data store (Buffer) .................................5-10

Default nodes ........................................... 5-7

Defaults .................................................... 5-8

Bench ............................................... 2-7

Function settings .............................. 2-7

Restoring ......................................... 2-7

Device action .........................................4-12

Display .....................................................2-6

Secondary ........................................ 2-7

Display reading options .......................... 3-12

E

External scanning ..................................4-22

F

Features ...................................................1-2

Filter ....................................................... 4-13

Configuring .................................... 4-15

Median ........................................... 4-14

Modes ............................................ 4-14

Types ............................................. 4-14

Fresh readings ......................................... 5-8

Front panel summary ............................... 2-2

Function configuration .............................. 5-9

G

Generating SRQ on buffer full ................ 5-16

Guarding .................................................. 3-3

H

Handle ..................................................... 2-3

Handling precautions ............................... 1-5

Humidity measurements ........................ 3-10

I

Idle ......................................................... 4-11

IEEE-488 Bus

Address selection ............................5-3

IEEE-488 bus

Connections ..................................... 5-2

Language selection .......................... 5-3

Standards ........................................ 5-2

IEEE-488 bus standards .......................... 5-2

Inspection ................................................ 1-5

Instruction manual .................................... 1-5

Internal scanning .................................... 4-21

K

Keys

6517B-900-01 Rev. A / Jun 2008 I-1

Index Model 6517B Electrometer User’s Manual

Display ..............................................2-3

Function ............................................2-3

Operation ..........................................2-3

Range ...............................................2-3

Voltage source .................................2-3

L

LabView driver ..........................................5-2

Line power connection ..............................2-6

Line voltage

Input module .....................................2-5

M

Manual addenda .......................................1-3

Math ........................................................4-16

Enabling .........................................4-18

Selecting and configuring ...............4-17

Measurement control ..............................3-11

Median filter ............................................4-14

Menus .......................................................4-5

Navigating ........................................4-6

Multiple displays ............................ 4-3, 4-24

N

Navigating menus .....................................4-6

O

One-shot triggering .................................5-14

Open/close channels and scan ..............5-10

Option slot ................................................2-5

Options ............................................ 1-3, 1-5

Output trigger ..........................................4-12

Overview ...................................................5-2

P

Perform the scan ......................... 4-21, 4-23

Phone number ................................. 1-2, 1-6

Power switch ............................................2-2

Power-up ..................................................2-6

Probes ......................................................1-4

Program examples .................................5-13

Q

Query commands .....................................5-7

R

Rack mount kits ........................................1-4

Rear panel summary ................................2-4

Relative .....................................................4-9

Remote interfaces ....................................5-2

Repacking for shipment ............................1-6

Resistance measurements .......................3-4

Resistivity measurements .........................3-7

Resolution ...............................................4-13

RS-232 interface .......................................5-3

Configuration ....................................5-4

Connections .....................................5-4

Selection ...........................................5-4

Standard ...........................................5-3

Running a test ........................................4-21

S

Safety symbols and terms ........................ 1-5

Scanner cards ..........................................1-4

SCPI commands ...................................... 5-5

Default nodes ...................................5-7

Long and short form .........................5-6

Queries ............................................5-7

Syntax ......................................5-6, 5-7

Tree structure ................................... 5-6

SCPI signal oriented commands ..............5-8

SCPI subsystem commands ....................5-8

Selecting and configuring a test sequence 4-19

Service form .............................................1-6

Software ...................................................1-4

Software support ......................................5-2

Speed ..................................................... 4-13

Status register ........................................5-12

Storing readings .....................................4-15

Storing readings in buffer .......................5-17

T

Taking readings with the scanner card ..5-18

Temperature measurements .................. 3-10

Temperature units ..................................3-11

Test fixture ...............................................1-4

Test Sequence — staircase sweep ........5-19

Test sequences ............................4-19, 5-11

Trigger connections ................................4-23

Trigger model .........................................5-11

Triggering ...............................................4-10

Bench default setup .......................4-12

Control sources ..............................4-12

Counters ........................................4-12

Device action .................................4-12

Idle .................................................4-11

Output trigger .................................4-12

U

Unpacking ................................................ 1-5

V

Voltage measurements ............................ 3-2

Voltage source ......................................... 4-7

Basic operation ................................4-9

Configuring .......................................4-9

Connections ..................................... 4-7

V-Source ................................................ 5-10

Z

Zero check .............................................4-10

Zero correct ............................................4-10

I-2 6517B-900-01 Rev. A / Jun 2008

Service Form

Model No. Serial No. Date
Name and Telephone No.

Company

List all control settings, describe problem and check boxes that apply to problem.

o Intermittent o Analog output follows display o Particular range or function bad; specify
o IEEE failure o Obvious problem on power-up o Batteries and fuses are OK

o Front panel operational o All ranges or functions are bad o Checked all cables

Display or output (check one)

o Drifts o Unable to zero
o Unstable o Will not read applied input
o Overload

o Calibration only o Certificate of calibration required
o Data required

(attach any additional sheets as necessary)
Show a block diagram of your measurement system including all instruments connected (whether power is turned on

or not). Also, describe signal source.

Where is the measurement being performed? (factory, controlled laboratory, out-of-doors, etc.)

What power line voltage is used? Ambient temperature?°F

Relative humidity? Other?

Any additional information. (If special modifications have been made by the user, please describe.)

Be sure to include your name and phone number on this service form.

12/06

12/06

Specifications are subject to change without notice.

All Keithley trademarks and trade names are the property of Keithley Instruments, Inc.

All other trademarks and trade names are the property of their respective companies.

A GREATER MEASURE OF CONFIDENCE

Keithley Instruments, Inc.

Corporate Headquarters • 28775 Aurora Road • Cleveland, Ohio 44139 • 440-248-0400 • Fax: [phone] • 1-888-KEITHLEY • www.keithley.com