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Keithley Instruments

28775 Aurora Road
Cleveland, Ohio 44139
1-800-935-5595

tek.com/keithley

SMU Potentiostats and EC-UPGRADE Kit

Quick Start Guide

071347302 / March 2020

*P071347302*

Description

The Keithley Instruments SMU (source-measure unit) Potentiostats are designed to make electrochemical

measurements easily and accurately. Included with your Model 2450, 2460, or 2461 Interactive SourceMeter

Instrument and other hardware is a USB flash drive containing electrochemistry test scripts or applications.

When running, each application can be user-configured to meet your specific test requirements.

The EC-UPGRADE kit lets you use an existing Keithley Instruments 2450, 2460, or 2461 SourceMeter as a

potentiostat or galvanostat.

The following applications are installed on your instrument or on the supplied USB flash drive.

▪

Cyclic Voltammetry

: Potential is swept at a user-programmable scan rate between two to four defined

potential vertices, and the resulting current is measured.

▪

Open Circuit Potential

: Measures the cell potential difference between two electrodes with high-input

impedance as a function of time.

▪

Potential Pulse and Square Wave

: Sources potential at programmable peak and base levels while

current is recorded at the pulse peak level, and the resulting current is measured.

▪

Current Pulse and Square Wave

: Sources current at programmable peak and base levels, and the

potential is recorded at the pulse peak level.

▪

Chronoamperometry

: Potential is stepped to a programmed value, and the resulting current is measured

as a function of time.

▪

Chronopotentiometry

: Current is stepped to a programmed value, and the resulting potential is

measured as a function of time.

This kit is not intended to be used with a SMU interlock enabled. To prevent electric shock

and possible damage to the test cable assembly or test setup, do not activate the Keithley

Instruments 2450, 2460, or 2461 interlock.

When the interlock is not engaged on the 2450, 2460, or 2461 the nominal output is limited to

±42 V. However, review the

Safety Precautions

(on page 23) section of this document to

ensure responsible operation.

Содержание KEITHLEY 2450

Страница 1: ...he resulting current is measured Open Circuit Potential Measures the cell potential difference between two electrodes with high input impedance as a function of time Potential Pulse and Square Wave Sources potential at programmable peak and base levels while current is recorded at the pulse peak level and the resulting current is measured Current Pulse and Square Wave Sources current at programmab...

Страница 2: ...ument is not included Model number Quantity 2450 2460 or 2461 1 01217440x 1 013042100 4 2450 800x 1 Description Keithley Instruments 2450 2460 or 2461 Interactive SourceMeter SMU Instrument with power cable 1 m connectorized cable assembly Insulated miniature alligator clips Interactive Sourcemeter Electrochemistry Kit USB Flash Drive and Instructions not pictured Figure 1 EC UPGRADE kit shipping ...

Страница 3: ...on or off Follow the steps below to connect the SMU to line power and turn on the instrument The SMU operates from a line voltage of 100 V to 240 V at a frequency of 50 Hz or 60 Hz It automatically senses line voltage and frequency Make sure the operating voltage in your area is compatible You must turn on the SMU and allow it to warm up for at least one hour to achieve rated accuracies Operating ...

Страница 4: ...r damage it When testing this type of DUT do not make final connections to it until the instrument has completed its power up sequence and is in a known operating state When testing this type of DUT disconnect it from the instrument before turning the instrument off To prevent any human contact with a live conductor connections to the DUT must be fully insulated and the final connections to the DU...

Страница 5: ...flash drive or copy the files from the flash drive to the instrument If you choose to copy the applications you must also copy the support files EC_Framework tsp and EC_Images tsp to your SMU To copy a script to the SMU 1 Insert the USB flash drive into the USB port on the front panel 2 Press the MENU key 3 Under Scripts select Manage The Manage Scripts menu opens Your list of Internal Scripts may...

Страница 6: ...he corresponding filename is displayed in the Internal Scripts list Figure 4 Copying the file to the instrument Connections and usage The cable assembly can be used with Keithley SMUs for electrochemistry applications Each connector of the assembly is labeled according to its function Figure 5 Cable assembly connector labels and definitions ...

Страница 7: ...nnectors into the SENSE terminals The FORCE terminals are used to source or sink voltage or current to or from a DUT Plug the HI and LO connectors into the FORCE terminals Plug the four SMU side cable connectors into the front of your SMU instrument as shown in the below graphic Figure 6 Connecting SMU side cable connectors to the SMU front panel inputs Make the device connections The test cable l...

Страница 8: ...d separately Figure 9 Four electrode cell testing cable connections Attach the alligator clips Four insulated alligator clips are supplied You can attach these clips to the ends of the device side connectors as shown in the following graphic The clips provide a safe secure way to connect to your device Figure 10 Alligator clip attached to accessory cable connector For small cells and electrodes yo...

Страница 9: ...gure shows the connections from a SMU to a three electrode test cell Figure 11 Front panel connections Run a test Once you have configured your SMU and connected a test cell you are ready to run a test For this example you will run the Cyclic Voltammetry test To run a test 1 Press the HOME key 2 Select the active script indicator at the top of your home screen If there is no script activity the in...

Страница 10: ...d Figure 14 Cyclic voltammetry home screen Review the test home screen controls All test home screen controls include End App Select this control to immediately stop the test and return to normal SMU operation Autoscale Select this control to define the graph based upon the plotted data This is useful for constraining all of the data to the screen s viewing size Start Test Select this control to i...

Страница 11: ...can select up to four voltage potential vertices which are defined as E1 or E initial E2 E3 and E4 in the next figure The slope of the lines is determined by the scan rate that you use You will set the scan rate later in this step of the test Figure 15 Potential sweep versus time of cyclic voltammetry example For this step you will set the Number of vertices define their potentials and specify the...

Страница 12: ...ings menu defining four vertices 5 Enter each vertex value in the range of 20 V After you define the vertices select the potential reference Eref or Eoc If you select Eref the applied potential is relative to the potential at the reference electrode If you select Eoc the applied potential is relative to the open circuit potential of the cell Eoc which is measured immediately before the scan begins...

Страница 13: ...n select a scan rate of 0 1 mV per second to 3500 mV per second To select the scan rate 1 From the scan Settings menu select Scan Rate Figure 19 Scan Settings menu selecting Scan Rate 2 Enter a value 3 Select OK After entering the scan rate you will choose the number of cycles from 1 to 100 The number of cycles determines how many times each scan is repeated To select the number of scan cycles 1 F...

Страница 14: ...setting a value for the sampling rate The acquired measurements are stored in the active buffer of the instrument cvBuffer The buffer can hold a maximum of 100 000 readings The following table describes the available interval units and accompanying range of values Sampling rate unit Description Sampling rate range of values points test The number of points acquired during a test regardless of how ...

Страница 15: ...ant to use for the test You can now set a sampling rate To set the sampling rate 1 From the Measure Settings screen select Sampling Rate 2 Enter a value 3 Select OK Now you will select the current range to measure the current from the scan Choose the range based upon the largest current magnitude you expect during the test To select the current measurement range 1 From the Measure Settings screen ...

Страница 16: ...t model Figure 24 Selecting the current range Although rare you may encounter overshoot ringing or other instability on the output of your SMU potentiostat depending the electrical impedance of your chemical cell This is particularly an issue when the impedance is capacitive and you are forcing voltage and measuring relatively low currents as with the cyclic voltammetry test In these cases you can...

Страница 17: ...ations can be stored To save the test parameters 1 From the Menu screen select Save Settings If you have saved a settings file previously with the same File Selection number you will be prompted to overwrite it Figure 26 Selecting Save Settings 2 Select a file number and then select Save Settings You are notified when the save is complete as shown in the next figure Select OK to clear the prompt F...

Страница 18: ...ey were created and saved For example you cannot load test parameter settings created with a 2450 EC to a 2460 EC 1 From the Menu screen select Load Settings Figure 28 Selecting Load Settings 2 Select a file by choosing File Selection and then a file number Figure 29 Choosing a file to load 3 Select Load Settings You are notified when the load completes Select OK to clear the prompt ...

Страница 19: ...n Figure 30 Cyclic voltammetry test results graph You can use the touchscreen to manipulate the graph or add cursors See your Interactive SourceMeterTM Instrument Reference Manual for more information You can save a screen capture to a flash drive inserted into the USB port of the potentiostat by simultaneously pressing the HOME key and the ENTER key The file name has the format imgmmdd_hhmmss png...

Страница 20: ...e outputs are powered off if a hardware or software fault occurs Acquire the open circuit potential Eoc If you selected Eoc as the potential reference for the scan then the open circuit potential will be measured immediately after starting the test You are prompted by the test application as shown in the next figure Figure 31 Prompt for Eoc measurement If you select Yes the instrument measures the...

Страница 21: ...ormation and parameter settings If there are more than 10 000 measurements stored the process of saving the data may take several minutes To save the test data to the flash drive 1 Make sure your flash drive is inserted into the front panel USB port 2 From the test application home screen select Save Data 3 Specify a file name then select OK 4 Select OK on the confirmation message Figure 34 Test r...

Страница 22: ...top Test turns off the instrument s output Next steps See the Model 2450 EC 2460 EC and 2461 EC Potentiostats User s Guide document number 07711040x for detailed information on running the other test scripts included with your potentiostat or upgrade kit The guide is included on the supplied USB flash drive Additionally see your Keithley Instruments 2450 2460 or 2461 Interactive SourceMeter Instru...

Страница 23: ...ed 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 ex...

Страница 24: ...plains hazards that could damage the instrument Such damage may invalidate the warranty The CAUTION heading with the symbol in the user documentation explains hazards that could result in moderate or minor injury or damage the instrument Always read the associated information very carefully before performing the indicated procedure Damage to the instrument may invalidate the warranty Instrumentati...

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