VFP600 Manual - Egmont Instruments
Contents
1. 15 Current gA alpina Vat ies asi A TN A if donee i A 60 042 20 06 34 1 1005 5 1 mes i mEes A y 1 af h HEt 1 L a D E a 1 TEE i a BIG 1 0 k A h INE N Lia 1 Igo Tpke 4 424 6 87 A a ee ibe dkna e E 8 Firm a Last Point Last Point indicators are available on the V vs T I vs T graph and indicate the most recently acquired Voltage or Current value On this graph the upper indicator 18 for Voltage while the lower indicator 1s for Current 92 960E 3 104 975E 6 Data Acquisition Graph Controls Graph Controls There are a number of Graph Controls available for the user to interact with the chart Each control will be discussed briefly below in the context of the V vs T I vs T multiplot graph the controls work in the same way for the I vs V and V vs I graphs Time 5 9 Voltage 43 Current 8 Scale Lock Toggles autoscaling When in the locked position this axis will autoscale Scale Format The scale format button allows the user to configure the format and precision of the graph as well as its grid color Graph Palette BA The leftmost tool on the graph palette selects a crosshair cursor This places the graph in normal operating mode Clicking the c2. This front panel gives the user a new level of control over their Gamry Potentiostat Interactions between the user and the hardware are available in real time This means that the user can make manual changes to potentiostat settings during data acquisition This panel is intended for use as a replacement for a hardware front panel It is not intended to replace any of the Gamry Framework applications which utilize the Explain scripting language Rather it is meant as an additional option when experimenters wish to run simple experiments and have instantaneous control over their potentiostat settings Interface Front Panel Interface Interface Front Panel Interface The Virtual Front Panel VFP600 consists of a single user interface window which presents hardware settings acquisition settings signal settings and collected data The VFP600 is broken up into four distinct regions These regions listed below will each be discussed in their own sections e Data Acquisition e Signal Generation e Device Settings e Experiment Control gt Gamry Instruments irtual Front Panel Ol x File Edit Window Help Signal Generation Data Acquisition Select Graph Y Ys T Ivs T y Voltage 4 0 000E 0 Time 5 8 Log Data To File Current A 000000000 TT al y vy Current A alr wavy Signal Type Sine Wave z Signal Frequency 1 000 4 Amplitude 100 00E 3 DC Offset 0 0000 Y
3. too low can cause data loss to occur Amplitude Used by Sine Cosine Square Wave and Sawtooth Controls the amplitude of the signal Cycles Used by all except Ramp and Single Point The number of complete cycles to apply the signal or waveform To maintain an indefinite number of cycles check the Continuous checkbox DC Offset Used by Single Point Sine Cosine Square Wave and Sawtooth The DC Offset control sets the constant DC Offset at which the signal is centered The default for this is O volts If you want to center the signal around the open circuit of the cell this is where the value for the open circuit would be entered Signal Generation Duty Cycle Duty Cycle Used by Square Wave The Duty Cycle control sets the duty cycle on off time for the square wave A symmetrical square wave will have a duty cycle of 50 From File Either enter a path and filename or use the Browse button to open standard Windows file dialog Initial and Final Initial and Final values as described by the Triangle and Ramp signals Phase Offset Used by Sine Cosine and Sawtooth The Phase Offset determines at what phase in degrees the signal will start Scan Rate Used by Triangle and Ramp Scan Rate determines how quickly the potentiostat will apply the Ramp or Triangle Signal Frequency Used by Sine Cosine Square Wave and Sawtooth This value determines the frequency of the waveform Please note that the Acquisitio
4. Gamry Instruments VFP600 Virtual Front Panel User Manual CopyrightO 2006 Gamry Instruments Inc Revision 5 10 August 14 2006 Product Description Introduction VFEFP600 Virtual Front Panel User Manta dan tena ease esa iaencaei sultan aetuns eee eaten PERO Oceana A A AT re eer ree E EE ee meer ene EE Front Panel Interact tbectiaaaiaukaaus sebelasuedttassiveds A ERAN tases Graphi GO wc Es eer eter ese er ree OS eine To Data Ele noria isis E a A ona Pa ic A 0 A oO EII A acs eae ec vs emcees eae ees aie eer ete 0 cid decias Error Bookmark not defined IDE yE Eosin E wen anual 10 POT Fle yessai cea coasustneraeud seaneatate E cias 10 l tiation ico iia 10 10 Sean RUC paces ara rege ole yada es a ale a awaits 10 so TFA Cea Mel gh ez queno en RO ne ee Tae OTe eee eee air Mee PTS eRe nr Ree Rei 10 DENT SII re sea ner nt Tamme naar Site cdo 1 DENN SS ese aac ee occu cette ic seed te cau ec eee see eet cceae centre nae teeta 11 Controller ais ts 11 Ven ch and VERIN asnar a 12 Y dando dia 12 VESD eenaa tede assoc a eden toed a oenau leu oddone anaes 12 rere aes 12 Nolhvand CrON turcas 152 Experiment COMO Na AA AAA AAA AAA 13 a alot a ae Mle tere andes 13 CS as 13 11 Product Description Introduction VFP600 Virtual Front Panel User Manual Product Description Introduction Thank you for choosing the VP600 Virtual Front Panel
5. current Galvanostat mode causes the hardware to control the current while monitoring the potential ZRA mode controls the two working electrodes to the same potential or a biased potential while monitoring the voltage and current fluctuations 1 Device Settings Vch Ich and VE Range Vch Ich and I E Range These controls are used to specify the voltage and current channel gain stages as well as the I E Range resistor When set to auto the control will be disabled and will display the current value for that particular setting Vch and Ich Filter Sets the analog filter available on the voltage or current channel of the potentiostat This filter should be set appropriately based upon the data acquisition frequency of the potentiostat The filter setting should be higher than the setting for the acquisition frequency VE Stability This setting controls the I E converter stability for potentiostat mode The slower settings apply more filtering and faster settings apply less filtering If the potentiostat is showing high speed oscillation that depends on the current range in use try increasing the Stability setting If your curves are noisy at low currents try setting Stability to Slow In Galvanostat mode this control will be disabled and the setting will be automatically set to Fast CA Speed The CA Speed setting sets the roll off filter on the potentiostat control amplifier This affects the overall stability of the pote
6. enter icon will select the Zoom tool The user can zoom in or out on the graph Clicking on the Zoom tool opens a popup menu which allows the user to choose methods of zooming The rightmost tool on the graph palette selects the Panning tool This allows the user to scroll the visible data by clicking and dragging the plot area of the graph Data Acquisition Logging to Data File Logging to Data File If the Log Data To File checkbox 1s checked upon the start of an experiment the user will be prompted for a location and filename for the log file via a standard Windows file dialog Otherwise the data will simply be displayed on the graph and then discarded Data Acquisition Select Graph Wiis T I vs T Log Data To File Signal Generation Signal Type Signal Generation The Signal Generation section of the Virtual Front Panel is used to select the signal to be applied by the potentiostat to the cell and also to control the timing of data acquisition Signal Type There are eight types of signals that the VFP can apply to a cell As many signals share similar setup parameters they will be described below Please note that the following screenshots were taken while the front panel was in Potentiostat mode Sine Wave and Cosine Wave These predefined signals output a sine or cosine wave The setup parameters for Sine and Cosine Wave are identical Signal Generation Signal Type Sine Wave Signal Frequenc
7. is not changed unless the user interacts with the front panel The value may be dynamically changed by the user m Signal Generation Single Point 0 00 0 2 100 000 2 Signal Generation Acquisition Frequency From File This signal type allows a user to define a signal using numbers in a linefeed delimited ASCII text file Signal Generation Signal Type From File Filename 1 4 Acq Frequency 100 000 Hz Cycles l Continuous There should be one number per text line in the file This number should represent the voltage in Volts or current in Amps which is to be applied by the potentiostat The rate at which the signal is applied is controlled by the Acquisition Frequency If the acquisition frequency is set to 10 Hz ten lines will be read from the file every second There is a one to one relationship between an acquired point and the signal Acquisition Frequency Used by all Signals This value controls the Acquisition Frequency of data acquisition This is the rate at which data is sampled by the potentiostat please see your hardware manual for details on the proper range for this value The upper limit for acquisition will be dependant upon your computer s performance but is ultimately limited to 4 kHz Make sure that the filter settings of the potentiostat correspond accordingly with the Acquisition Frequency setting A filter setting which is
8. n Frequency must be greater than two times the Signal Frequency in order to meet the Nyquist Criterion 10 Device Settings Device Device Settings This section of the Virtual Front Panel allows the user to change the hardware settings of the potentiostat Please note that the following descriptions are simply an overview of the potentiostat s settings Please consult your hardware manual for further details on these options Device Settings Device ras CtriMode Potentiostat l IE Range 30000 l M Auto ch Range ay Auto Ich Range ay M Auto ch Filter 2o0kHz El Ich Filter 200kHz l LE Stability Normal CA Speed Normal l ch Offset 00E 0 Disabled Ich Offset a 8 Disabled Device This control allows the user to select which potentiostat in a multiple potentiostat system to user for the experiment The potentiostat selector is only active prior to the start of data acquisition After data acquisition has begun this selector will become disabled The potentiostat is selected by its label which will be displayed in the drop down list If a potentiostat is powered on or off while the application is running this list will refresh The Virtual Front Panel may be unresponsive while it responds to this occurrence Control Mode This control allows the user to specify the controlling mode of the potentiostat Potentiostat mode causes the hardware to control the potential while monitoring the
9. nning of an experiment and turn it off at the end automatically If further control is desired simply disable the Auto feature and the potentiostat s cell will be under full manual control 13
10. ntiostat This setting largely depends on the cell being examined and as such CA speed settings offered are only a guideline The Normal setting 1s appropriate for most cells However if the potentiostat oscillates on all of the current ranges alter this setting Vch and Ich Offset These fields are use to enter a fixed offset value for the Voltage and Current channels This DC offset 1s subtracted from the measured signal prior to the A D converter and in the case of Ich Offset after the I E Range resistor This allows the A D converter to giver more sensitive measurements on the actual AC component of the signal This offset should be used carefully If an incorrect offset is selected the measurement may become flat lined due to a saturated Voltage or Current Range Please note that this option is not available on all potentiostats 12 Experiment Control Start Experiment Control This section of the Virtual Front Panel allows the user to begin an experiment and control the external cell of the potentiostat Experiment Control Cell State EA 4 Auto Start This button controls the starting and stopping of data acquisition The button will be disabled 1f there are no valid potentiostats connected to the system Cell State This control allows the user to turn on or off the external cell of the potentiostat Normally the user should leave the Auto checkbox in the enabled state as this will turn the cell on at the begi
11. s T HARI Phase Offset 0 0000 Degrees 120E 3 Acq Frequency 100 000 Hz 100E 3 l 80 0E 3 a 1 I continuous 60 0E 3 410 06 32 Device Settings e 20 0E 3 Device PCI4 5 5 0 00E 0 E CtriMode Potentiostat z 20 0E 3 40 0E 3 I E Range 300 m z T Auto 60 0E 3 ch Range 3 I Auto 80 0E 3 Ich Range x E Auto ch Filter 200 kHz 5 Ich Filter 200 kHz 100E 6 75 0E 6 1 E Stability Normal 2 6 T 25 06 6 CA Speed Normal z a 0 00 0 0 00E 0 i 5 ch Offset I Disabled sea Ich Offset 0 00E 0 Disabled 50 0E 6 75 0E 6 100E 6 125E 6 NI 00 00 00 00 00 00 00 01 00 00 00 0 Time s Experiment Control starr Cell State Cc I Auto Data Acquisition Graph Selector Data Acquisition This section of the Virtual Front Panel is used to present the acquired data to the user Graph Selector The graph selector allows the user to determine which graph they would like to use for their data presentation Data Acquisition Select Graph Wis T Tvs T Three different graphs are available for the user to choose from They are e Voltage vs Time and Current Vs Time V vs T I vs T e Current vs Voltage I vs V e Voltage vs Current V vs I II ce Select Graph vi tivit wag e A bebect reg ls 2 Tad voltage iv aaa I Log Data To Ple Curent Fama ha Ml i cet
12. y 1 000 Hz Amplitude 100 00E 3 Y DC Offset 0 0000 Phase Offset 0 0000 Degrees Acg Frequency 100 000 Hz Cycles 1 Continuous Triangle This predefined signal outputs an up down linear ramp The triangle waveform starts at the initial value proceeds to the final value and back to the initial value again This will continue for the designated number of cycles Signal Generation Signal Type Triangle Initial 0 0E 0 y Final 1 0E 0 y Scan Rate 1 00 is Acq Frequency 100 000 Hz Cycles l Continuous Signal Generation Signal Type Square Wave This predefined signal outputs a square wave Signal Generation Signal Type Square Wave ad Signal Frequency 1 000 F Amplitude 100 00E 3 DC Offset 0 0000 Y Duty Cycle c0 0000 4 Percent F Acq Frequency 100 000 4 Hz Cycles Continuous Sawtooth This predefined signal outputs a sawtooth wave Signal Generation Signal Type Sawtooth Signal Frequency 1 000 Amplitude 100 00E 3 DC Offset 0 0000 Y T Phase Offset 0 0000 a Degrees T Acg Frequency 100 000 Hz T Cycles 1 Continuous Signal Generation Signal Type Ramp This predefined signal outputs a linear ramp E Signal Generation 0 0 0 1 0E 0 100 000 Single Point The Single Point signal outputs a simple voltage or current value to the potentiostat The signal
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