Tektronix 2308 Quick Start Guide

Model 2308 Portable Device Battery/Charger Simulator

Quick Start Guide

2308-903-01 Rev. A / July 2008

www.keithley.com

A GREATER MEASURE OF CONFIDENCE

WARRANTY

Keithley Instruments, Inc. warrants this product to be free from defects in material and workmanship for a period 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 balance 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 battery 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: 440-248-6168 • 1-888-KEITHLEY (1-888-534-8453) • www.keithley.com

3/07

The following safety precautions should be observed before using this product and 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 rated 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. ALWAYS 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.

To 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.

Model 2308 Portable Device

Battery/Charger Simulator

Quick Start Guide

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 other brand names are trademarks or

registered trademarks of their respective holders.

Cleveland, Ohio, U.S.A.

Document Number:

2308-903-01 Rev. A / July 2008

Title Page

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

Performance features........................................................................... 1-1

Proper supply connections to the DUT....................................................... 1-2

Front-panel operation ................................................................................. 1-7

Menu controls....................................................................................... 1-7

Setting the output voltage, current limit, and current range.................. 1-7

Turning supply output ON/OFF ............................................................ 1-7

V and I display modes (Single and Dual) ............................................. 1-8

DVM input mode (Channel 2 Only) .................................................... 1-11

Pulse current mode ............................................................................ 1-12

Long integration mode ....................................................................... 1-21

Variable output impedance control on battery channel............................. 1-26

Variable output bandwidth ........................................................................ 1-27

Front-panel operation for output bandwidth ....................................... 1-27

Advanced features.................................................................................... 1-28

Analog output ..................................................................................... 1-28

Optimizing measurement speed ........................................................ 1-29

List of Figures

Figure Title Page

Figure 1 Model 2308 front panel ................................................................................. 1

Figure 2 Rear-panel view of Model 2308 ................................................................... 3

Figure 3 Battery channel preferred connection (maximum stability) ........................... 4

Figure 4 Battery channel fastest transient response connection ............................... 5

Figure 5 Charger channel 4-wire remote sense connection of the

DUT to the output ...................................................................................... 6

Figure 6 Charger Control Circuit Testing .................................................................... 11

Figure 7 Pulsed waveform ........................................................................................ 13

Figure 8 Eliminating the effect of a current transient on a pulse current

measurement ........................................................................................... 14

Figure 9 Determining voltage and current characteristics for battery channel .......... 19

Figure 10 Pulsed waveform ........................................................................................ 21

Figure 11 Analog output .............................................................................................. 28

Introduction

POWER

DISPLAY

OPERATE

ENTER

SET

LOCAL

2308 Portable Device Battery/Charger Simulator

NOTE For additional information about any feature discussed in this

This guide is designed to familiarize users of the Keithley Model 2308 Portable Device Battery/Charger Simulator with the basic operating features available from the instrument’s front panel and also the GPIB bus. The sequence of operating instructions reflects the order in which the instrument would be configured for a typical application. For each operating mode, an example set of bus commands is provided. While the SCPI command strings are generic, the exact programming syntax will depend on the test program language.

Figure 1 Model 2308 front panel

Introduction 1

guide (including programming examples), refer to the Model 2308 Portable Device Battery/Charger Simulator User's Manual (part number 2308-900-01 (A - July 2008)).

Performance features

• The Model 2308 is a specialized power supply that has a very fast recovery to large, near instantaneous load current transitions. Conventional power supplies do not have this capability. The Model 2308 is designed specifically to respond to large load changes and very short pulsed loads with small transient voltage drop and a very fast recovery time. Typical devices that have these types of characteristic loads are mobile phones,

2 Proper supply connections to the DUT

wireless communication modules, and other portable, battery operated devices. The Model 2308 can maintain a near-constant output, even under quickly-changing load conditions.

• The power supply can measure a wide range of load currents. It can resolve down to 0.1 capability as well and can measure load current pulses as narrow as 50

μsec.

• The Model 2308 can simulate the output of a battery. Its programmable output resistance can simulate a battery’s internal resistance so that the voltage output looks like that of a battery’s output.

• The two channels can also sink current so that one channel (the battery channel) simulates a discharged battery, while the other channel (the charger channel) can be used to simulate a charger

μA and measure up to 5 A. It has fast measurement

Proper supply connections to the DUT

WARNING When installing a unit into a test system, make sure the

external power sources do not apply voltage to the power supply in excess of its maximum limits (see specifications). Failure to do so could result in personal injury or death.

The power cord supplied with the Model 2308 contains a separate ground for use with grounded outlets. When proper connections are made, instrument chassis is connected to power line ground through the ground wire in the power cord. Failure to use a grounded outlet may result in personal injury or death due to electric shock.

Figure 2 shows a detailed rear-panel view of the Model 2308 detailing the

connector sockets for the battery channel OUTPUT #1 and the charger channel OUTPUT #2. device-under-test (DUT) preferred connection (Figure 3) and fastest transient response connection (Figure 4).

NOTE The Model 2308 does not have an internal local sense

Figure 3 and Figure 4 show optimum remote 4-wire connections for

connection. Therefore, you must connect the DUT to the supply in either a remote or local sense configuration so that the Model 2308 can output a controlled voltage.

Proper supply connections to the DUT 3

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.

MADE IN

U.S.A.

LINE RATING

100-120VAC, 200-240VAC

50, 60 HZ 165VA MAX

LINE FUSE

SLOWBLOW

2.0A, 250V

IEEE-488

(ENTER IEEE ADDRESS

FROM FRONT PANEL MENU)

REMOTE DISPLAY

OPTION

+++

___

SOURCE SENSE

SOURCE

OUTPUT #1

ISOLATION FROM EARTH: 22 VOLTS MAX MAX.

RELAY

CONTROL

24VDC MAX

DVM IN

-30 VDC MAX

ANALOG

OUT

(5/50)A(0.5/5)

+++

____

SOURCE SENSE

DVM IN

SOURCE

OUTPUT #2

For the most accurate 4-wire remote sense application, the source and the sense inputs to the supply must be connected as close to the inputs of the load as possible through twisted pair leads as shown in

Figure 3, Figure 4, and Figure 5.

Figure 2 Rear-panel view of Model 2308

4 Proper supply connections to the DUT

Quick Disconnect

Connector

DUT

Source -

Sense -

Sense +

Source +

Twisted Pair

(5mA/50mA)

(0.5A/5A)

Analog Outputs

Internal

Oscilloscope

Digitizer

Load Test Leads

10mA/V

1A/V

Figure 3 Battery channel preferred connection (maximum stability)

NOTE Twist source leads together and twist sense leads together for

optimum performance.

The analog outputs provide a voltage output based on the measured current as follows:

0.5/5 A Output referenced to Source - : 1 A/V (each volt out represents 1A) 5/50 mA Output referenced to Source - : 10 mA/V (each volt out represents 10 mA)

Proper supply connections to the DUT 5