Keithley 2260B-80-13, 2260B-250-4, 2260B-250-9, 2260B-30-108, 2260B-30-72 Adjustment Manual

www.tek.com/keithley

Series 2260B

Multi-Range Programmable DC Power Supplies

Verification and Adjustment Manual

077104802 / November 2016

*P077104802*

077104802

A Greater Measure of Confidence

Series 2260B

Programmable Power Supplies

Verification and Adjustment Manual

Cleveland, Ohio, U.S.A.

Any unauthorized reproduction, photocopy, or use of the information herein, in whole or in part,

without the prior written approval of Keithley Instruments is strictly prohibited.

All Keithley Instruments product names are trademarks or registered trademarks of Keithley Instruments. Other brand names are trademarks or registered trademarks of their respective

holders.

Microsoft, Visual C++, Excel, and Windows are either registered trademarks or trademarks of

Microsoft Corporation in the United States and/or other countries.

Document number: 077104802 / November 2016

Safety precaut ions

The following safety precauti o ns shou ld be observ ed befor e usin g th is produ ct and any associa t ed inst rum enta tion. Although some instruments and accessories would normally be used with nonhazardous 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.

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 measurement, control, and data I/O connections, with low transient overvoltages, and must not be directly connected to mains voltage or to voltage sources with high transient overvoltages. Measurement Category II (as referenced in IEC 60664) connections require protection for high transient overvoltages often associated with local AC mains connections. Certain Keithley Instruments measuring instruments may be connected to mains. These instruments will be marked as category II or higher.

Unless explicitly allowed in the specifications, operating manual, and instrument labels, do not connect any instrument to mains. 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 30 V RMS, 42.4 V peak, or 60 VDC 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 1000 V, 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.

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: co nnecting 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.

For safety, instruments and accessories must be used in accordance with the operating instructions. If the instruments or accessories are used in a manner not specified in the operating instructions, the protection provided by the equipment may be impaired.

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

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 protective earth (safety 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.

screw is present, connect it to protective earth (safety ground) using the wire recommended in the user documentation.

If a

The

symbol on an instrument means caution, risk of danger. The user must refer to the operating instructions located in the

user documentation in all cases where the symbol is mark ed on the instr u ment .

The

symbol on an instrument means caution, risk of electric shock. Use standard safety precautions to avoid personal

contact with these voltages.

The

If this

symbol on an instrument shows that the surface may be hot. Avoid personal contact to prevent burns.

symbol indicates a connection terminal to the equipment frame.

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 h az ards that coul d dama ge the instrument. Such damage may

invalidate the warranty. Instrumentation and accessories shall not be conne cted to human s. 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. The detachable mains power cord provided with the instrument may only be replaced with a similarly rated power cord. 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.

Unless otherwise noted in product-specific literat ure , Kei thle y Instruments instruments are designed to operate indoors only, in the following environment: Altitude at or below 2,000 m (6,562 ft); temperature 0 °C to 50 °C (32 °F to 122 °F); and pollution degree 1 or 2.

To clean an instrument, use a damp cloth or mild, water-based cleaner. Clean the exterior of the instru ment 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.

Safety precaution revision as of March 2016.

Thank you for choosing a Keithley Instruments product. The Series 2260B Programmable DC Power Supplies is designed for use in the laboratory and for test applications. It also has excellent regulation and low output voltage ripple. The digital displays provide accurate readings of voltage and current and also provide for easy, precise setting of output values using digital entry of current and voltage values. Output voltage can be set from the front panel, using a remote analog voltage or resistance, or over any of the digital interfaces: LAN, USB, GPIB, or RS-485. Voltage and current analog outputs are also available for remote monitoring and analog control.

Section 1

Introduction

In this section:

Welcome .................................................................................. 1-1

Extended warranty ................................................................... 1-1

Contact information .................................................................. 1-1

Extended warranty

Additional years of warranty coverage are available on many products. These valuable contracts protect you from unbudgeted service expenses and provide additional years of protection at a fraction of the price of a repair. Extended warranties are available on new and existing products. Contact your local Keithley Instruments representative for details.

Contact information

If you have any questions after you revie w the infor mation in this documentation, please contact your local Keithley Instruments office, sales partner, or distributor. You can also call the corporate headquarters of Keithley Instruments (toll-free inside the U.S. and Canada only) at 1-800-935-5595, or from outside the U.S. at +1-440-248-0400. For worldwide contact numbers, visit the

Instruments website (http://www.tek.com/keithley).

Keithley

Section

ent Manual

2260B-30-36

0 V to 30 V

0 A to 36 A

360 W

2260B-30-72

0 V to 30 V

0 A to 72 A

720 W

2260B-30-108

0 V to 30 V

0 A to 108 A

1080 W

2260B-80-13

0 V to 80 V

0 A to 13.5 A

360 W

2260B-80-27

0 V to 80 V

0 A to 27 A

720 W

2260B-80-40

0 V to 80 V

0 A to 40.5 A

1080 W

2260B-250-4

0 V to 250 V

0 A to 4.5 A

360 W

2260B-250-13

0 V to 250 V

0 A to 13.5 A

1080 W

2260B-800-1

0 V to 800 V

0 A to 1.44 A

360 W

2260B-800-2

0 V to 800 V

0 A to 2.88 A

720 W

2260B-800-4

0 V to 800 V

0 A to 4.32 A

1080 W

1: Introduction Series 2260B Programmab le Power Supplies Verification and Adjustm

Series 2260B available models

The 2260B series consists of 12 models, divided into three different model types covering four power capacities: 360 watt models, 720 watt models, and 1080 watt models.

Model number Output voltage Output current Power

2260B-250-9 0 V to 250 V 0 A to 9 A 720 W

1-2 077104802 / November 2016

Verification equipment .............................................................. 2-1

In this section:

Verification information ............................................................. 2-1

Verification information

In order to ensure that the power supply is working properly and performance accuracy, we recommend that you use the equipment listed for verifying your equipment. Also, note the following conditions and parameters that you should follow when performing verification procedures.

It is recommended that you verify instrument specifications when:

Section 2

Verification preparation

• Using the power supply in a new environment.

• Removing the cover for any reason.

The following are the environmental conditions that are required when performing verification and adjustment:

• Indoor location only; no direct sunlight; dust free area

• Relative humidity <80%

• Temperature +18 to 28 °C (64 to 82 °F)

• Warm-up time ≥30 minutes

If the verification fails:

• You will need to perform the adjustment procedure.

• If the adjustment does not accomplish the desired result you will have to send the instrument to

your local Keithley Instruments office, sales partner, or distributor for repair (see

Information (on page 1-1).

Contact

Section

Verification and Adjustment Manual

Precision current shunt

3 A (0.1 Ω) 0.02% TC = 10 ppm / ºC

GW Instek PCS-1000 or

30 A (0.01 Ω) 0.02% TC = 10 ppm / ºC

300 A (0.001 Ω) 0.02% TC = 10 ppm / ºC

Electronic loads

60 V, 240 A minimum with transient capability and a slew rate of 1 A/μs or better.

Various manufacturers of

500 V, 60 A minimum with transient capability

and a slew rate of 0.4 A/μs or better.

and a slew rate of 0.2 A/μs or better.

AC power supply Adjustable to highest rated input voltage range

Ametek 3001i or equivalent Power: 3000 VA

Oscilloscope

Sensitivity: 1 mV

Tektronix DPO4014B or

Bandwidth limit: 20 MHz

Probe: 1:1 with JEITA RC-9131B

Voltage resolution: 0.1 mV

Accuracy: <0.01% mV of reading

2: Verification preparation Series 2260B Programmab le Power Supplies

Verification equipment

Here is a list of the recommended equipment used for verifying the specifications of the programmable DC power supplies:

Type Specifications Recommended instrument

1000 V, 12 A minimum with transient capability

Digital multimeter

equivalent

programmable DC power supply for electronic loads

equivalent

Keithley DMM 7510 or equivalent

Note that the following sections will indicate how to set up the equipment based on the type of verification that you are performing.

2-2 077104802 / November 2016

Constant voltage (CV) verification tests ................................... 3-1

Constant voltage verific at io n

In this section:

Constant voltage (CV) verification tests

There are four verification tests in this series. These tests verify display panel accuracy, verify programmed voltage, measure output voltage changes based on load or no load, measure output voltage based on AC line voltage changes, and measure ripple and noise.

Voltage programming and measurement accuracy verification

Section 3

This test verifies that the voltage programming and measurement functions are within specifications.

Hazardous voltages may be present on all output and guard terminals. To prevent electrical shock that could cause injury or death, never make or break connections to any of the instruments used for this verification test while instruments are powered on. Turn off the 2260B instrument from the front panel or disconnect the main power cord from the rear of the instrument before handling cables. Putting the equipment into an output-off state does not guarantee that the outputs are powered off if a hardware or software fault occurs. Precautions must be taken to prevent a shock hazard by surrounding the test device and any unprotected leads (wiring) with double insulation for up to 800 volts depending on the power supply that you have, Category I.

Figure 1: 2260B Voltage adjustment devices

Section

Verification and Adjustment Manual

3: Constant voltage verification Series 2260B Programmab le Power Supplies

Before proceeding, make sure that the 2260B instrument is off.

To perform voltage programming and measurement accuracy:

1. Connect the AC power supply to the 2260B.

2. Connect the DMM on the PCS-1000 directly across the +S and -S terminals to an electronic DC load, as shown in the previous figure.

3. Turn on the 2260B and, if necessary, all of the other instruments.

4. Press the Set button on your 2260B and program the output voltage to 0.1 and the output current to its maximum value with the load off (see Series 2260B available models (on page 1-1

)).

5. On the 2260B press the Output button. Note that CV is displayed on the 2260B front panel and the output current reading on the PCS-1000 should be approximately zero.

6. Record the DMM output voltage reading and the voltage indicated on the 2260B. The readings should be within the limits specified in the test record form for the appropriate model (see

Verification test record forms (on page 5-1

) for the appropriate model, under Voltage

Programming and Measurement).

7. Program the output voltage to its maximum rated value (see Series 2260B available models (on page 1-1)).

8. Record the DMM output voltage reading and the voltage indicated on the 2260B.

The readings should be within the limits specified in the test record form for the appropriate model (see Verification test record forms (on page 5-1

) for the appropriate model, under Voltage

Programming and Measurement).

Constant voltage load regulation verification

This test measures the change in output voltage resulting from a change from full load to no load.

Hazardous voltages may be present on all output and guard terminals. To prevent electrical shock that could cause injury or death, never make or break connections to any of the instruments used for this verification test while instruments are powered on. Turn off the 2260B instrument from the front panel or disconnect the main power cord from the rear of the instrument before handling cables. Putting the equipment into an output-off state does not guarantee that the outputs are powered off if a hardware or software fault occurs. Precautions must be taken to prevent a shock hazard by surrounding the test device and any unprotected leads (wiring) with double insulation for up to 800 volts depending on the power supply that you have, Category I.

Figure 2: 2260B Constant voltage load regulation

Verifying voltage programming and measurement accuracy is complete.

3-2 077104802 / November 2016

Series 2260B

Constant voltage verification

Programmable Power Supplies Verification and Adjustment Manual Section 3:

Before proceeding, make sure that the 2260B instrument is off.

To perform CV load regulation verification:

1. Connect the AC power supply to the 2260B.

2. Connect the DMM on the PCS-1000 directly across the +S and -S terminals to an electronic DC load, as shown in the previous figure.

3. Turn on the 2260B and, if necessary, all of the other instruments.

4. Press the Set button on your 2260B and program the output current to its maximum value and the output voltage to the maximum rated value (see Series 2260B available models (on page

1-

1)).

5. On the 2260B press the Output button.

6. On the electronic DC load instrument, set the output load to 1 A. Note that CV is displayed on the 2260B front panel. If CV is not displayed, adjust the load so that the output current drops and CV is displayed.

7. Record the DMM output voltage reading.

8. Open the load and record the DMM voltage reading.

The difference between the DMM readings in steps 7 and 8 is the load effect, which should not exceed the value listed in the test record form (see Verification test record forms (on page 5-1

) for the

appropriate model, under CV load regulation). Verifying CV load regulation is complete.

Constant voltage line regulation verification

This test measures the change in output voltage resulting from a change in AC line voltage from the minimum to maximum value within the line voltage specifications.

Hazardous voltages may be present on all output and guard terminals. To prevent electrical shock that could cause injury or death, never make or break connections to any of the instruments used for this verification test while instruments are powered on. Turn off the 2260B instrument from the front panel or disconnect the main power cord from the rear of the instrument before handling cables. Putting the equipment into an output-off state does not guarantee that the outputs are powered off if a hardware or software fault occurs. Precautions must be taken to prevent a shock hazard by surrounding the test device and any unprotected leads (wiring) with double insulation for up to 800 volts depending on the power supply that you have, Category I.

Figure 3: 2260B Constant voltage line regulation

077104802 / November 2016 3-3

Section

Verification and Adjustment Manual

3: Constant voltage verification Series 2260B Progr am mab le Power Supplies

Before proceeding, make sure that the 2260B instrument is off.

To perform CV line regulation verification:

1. Connect the AC power supply to the 2260B.

2. Connect the DMM on the PCS-1000 directly across the +S and -S terminals to an electronic DC load, as shown in the previous figure.

3. Turn on the 2260B and, if necessary, all of the other instruments.

4. Set the variable AC voltage to nominal line voltage.

5. Press the Set button on the 2260B and program the output current to its maximum value and the output voltage to its maximum rated value (see Series 2260B available models (on page 1-1

)).

6. On the 2260B press the Output button.

7. On the electronic DC load instrument, set the electronic output load to 1 A. Note that CV is displayed on the 2260B front panel. If CV is not displayed, adjust the load so that the output current drops and CV is displayed.

8. Adjust the AC power source to the low-line voltage (85 VAC for 100/120 nominal line; 170 VAC for 200/240 nominal line).

9. Record the DMM output voltage reading.

10. Adjust the AC power source to the high-line voltage (132 VAC for 100/120 nominal line; 265 VAC for 200/240 nominal line).

11. Record the DMM output voltage reading.

The difference between the DMM reading in steps 9 and 11 is the source effect, which should not exceed the value listed in the test record form (see Verification test record forms (on page 5-1

) for the

appropriate model, under CV line regulation). Verifying CV line regulation is complete.

3-4 077104802 / November 2016

Series 2260B

Constant voltage verification

Programmable Power Supplies Verification and Adjustment Manual Section 3:

Constant voltage ripple and noise verification

This test measures the DC output voltage with the (10:1) 50 Ω probe.

Hazardous voltages may be present on all output and guard terminals. To prevent electrical shock that could cause injury or death, never make or break connections to any of the instruments used for this verification test while instruments are powered on. Turn off the 2260B instrument from the front panel or disconnect the main power cord from the rear of the instrument before handling cables. Putting the equipment into an output-off state does not guarantee that the outputs are powered off if a hardware or software fault occurs. Precautions must be taken to prevent a shock hazard by surrounding the test device and any unprotected leads (wiring) with double insulation for up to 800 volts depending on the power supply that you have, Category I.

Figure 4: 2260B Constant voltage ripple noise verification

077104802 / November 2016 3-5

Section

ual

3: Constant voltage verification Series 2260B Programmab le Power Supplies Verification and Adjustment Man

Before proceeding, make sure that the 2260B instrument is off.

To perform CV ripple and noise verification:

1. Connect the AC power supply to the 2260B.

2. Connect the DMM on the PCS-1000 directly across the +S and -S terminals to an electronic DC load, as shown in the previous figure.

3. Turn on the 2260B and, if necessary, all of the other instruments.

4. On the oscilloscope, set the AC coupling to 20 MHz bandwidth, the scale to 10 mV Sampling mode to average, and the measurement to peak-to-peak.

5. Press the Set button on your 2260B and program the power supply to output current to its maximum value and the output voltage to its maximum rated value (see

Series 2260B available

models (on page 1-1)).

6. On the 2260B press the Output button. Let the oscilloscope run for 20 seconds in order to generate enough measurement points. The result should not exceed the peak-to-peak limits in the test record form.

7. Use the DMM to measure the RMS noise voltage using AC voltage (see next figure).

The result should not exceed the RMS limits in the test record form (see Verification test record forms (on page 5-1) for the appropriate model, under CV ripple and noise - RMS).

Verifying CV ripple and noise is complete.

3-6 077104802 / November 2016

Constant current verification tests ............................................ 4-1

Constant current verification

In this section:

Constant current (CC) verification tests

There are four verification tests in this series. These tests verify display panel accuracy, verify programmed voltage, measure output voltage changes based on load or no load, measure output voltage based AC line voltage changes, and measure output noise.

Current programming and measurement accuracy verification

Section 4

This test verifies that the current programming and measurement functions are within specifications.

Hazardous voltages may be present on all output and guard terminals. To prevent electrical shock that could cause injury or death, never make or break connections to any of the instruments used for this verification test while instruments are powered on. Turn off the 2260B instrument from the front panel or disconnect the main power cord from the rear of the instrument before handling cables. Putting the equipment into an output-off state does not guarantee that the outputs are powered off if a hardware or software fault occurs. Precautions must be taken to prevent a shock hazard by surrounding the test device and any unprotected leads (wiring) with double insulation for up to 800 volts depending on the power supply that you have, Category I.

Figure 5: 2260B Current analog adjustment devices

Keithley 2260B-80-13, 2260B-250-4, 2260B-250-9, 2260B-30-108, 2260B-30-72 Adjustment Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

Safety precaut ions

Table of Contents

Welcome

Introduction

Extended warranty

Contact information

Series 2260B available models

Verification information

Verification preparation

Verification equipment

Constant voltage verific at io n

Constant voltage (CV) verification tests

Voltage programming and measurement accuracy verification

Constant voltage load regulation verification

Constant voltage line regulation verification

Constant voltage ripple and noise verification

Constant current verification

Constant current (CC) verification tests

Current programming and measurement accuracy verification