Metrohm 757 VA Computrace Manuel d'utilisateur Page 1

CH-9101 Herisau/Switzerland Internet www.metrohm.com E-Mail [email protected] 2.757.01X0 757 VA Computrace 8.757.8023 Software Manual 31.08

Table of contents 757 VA Computrace – Software VIII 8.5 General rules for VA trace analysis... 164 Chemi

5 Determination mode 757 VA Computrace – Software 90 The progress indicator below this field shows the progress of the determination. The details

5.3 Monitor 757 VA Computrace – Software 91 Sample ID [ 16 characters ; "std" ] Identification for sample. Sample size [ > 0

5 Determination mode 757 VA Computrace – Software 92 MANUAL ADDITION This window appears at the start of each manual addition of standard solutions

5.3 Monitor 757 VA Computrace – Software 93 Graphical properties for monitoring curves The graphical properties for curves in the MONITORING wind

5 Determination mode 757 VA Computrace – Software 94 5.4 Determination curves Load/save determinations Determination files (*.dth) contain the meas

5.4 Determination curves 757 VA Computrace – Software 95 Determination curves window The DETERMINATION CURVES window shows the determination and

5 Determination mode 757 VA Computrace – Software 96 Edit determination method parameters DETERMINATION CURVES / Edit / Determination method para

5.4 Determination curves 757 VA Computrace – Software 97 Title [ 0...68 characters ; "Method title" ] Method title. Remark1 [ 0

5 Determination mode 757 VA Computrace – Software 98 Substances The Substances tab of the EDIT DETERMINATION METHOD PARAME-TERS window contains par

5.4 Determination curves 757 VA Computrace – Software 99 Automatic Switch on/off the automatic peak baseline evaluation. Begin Manual setting

1.1 Purpose of program 757 VA Computrace – Software 1 1 Introduction 1.1 Purpose of program «VA Computrace 2.0» is the name of the control softw

5 Determination mode 757 VA Computrace – Software 100 Auto scaling DETERMINATION CURVES / Plot / Auto scale (F4) Reset zooming and scale x and y

5.4 Determination curves 757 VA Computrace – Software 101 DETERMINATION CURVES / Plot / Properties / Curves window The page properties of the det

5 Determination mode 757 VA Computrace – Software 102 Graphical properties for calibration curves The graphical properties for calibration curves i

5.5 Results 757 VA Computrace – Software 103 5.5 Results Results window overview The RESULTS window contains the current full report for the load

5 Determination mode 757 VA Computrace – Software 104 The RESULTS window comprises the following parts: Header Metrohm 757 VA Computrace Name of m

5.5 Results 757 VA Computrace – Software 105 Method data Method File name of the method used for the determination. Title Method title. Remark1 R

5 Determination mode 757 VA Computrace – Software 106 Comments Display of comments if any type of error appeared in the sweep (e.g. Ovl. in scan =

5.5 Results 757 VA Computrace – Software 107 Final results Final results Calculated results for the calculation formulae defined in the CALCULATI

5 Determination mode 757 VA Computrace – Software 108 5.6 Sample table The SAMPLE TABLE window shows the sample data of the loaded sample table.

5.6 Sample table 757 VA Computrace – Software 109 Status [ read only ] Display of sample determination status: Measu-ring, Done or "empt

1 Introduction 757 VA Computrace – Software 2 1.2 General information Hardware requirements for the PC Computer Pentium II with 233 MHz or higher

5 Determination mode 757 VA Computrace – Software 110 Edit sample table The addition of new rows or the modification of existing rows in the sample

5.7 Printing in determination mode 757 VA Computrace – Software 111 5.7 Printing in determination mode MAIN WINDOW / File / Print (Ctrl+P) Pri

5 Determination mode 757 VA Computrace – Software 112 Determination method Printout of the method parameters used for the determination. Working

5.8 Data processing and evaluation 757 VA Computrace – Software 113 5.8 Data processing and evaluation Data transfer After the start of a determ

5 Determination mode 757 VA Computrace – Software 114 In connection with the measured value recording, the following rules apply to the sweeps: •

5.8 Data processing and evaluation 757 VA Computrace – Software 115 Peak recognition With the derived curves a search is made for successive mini

5 Determination mode 757 VA Computrace – Software 116 Baseline calculation Recognized peaks are evaluated using approximated baselines. The calcula

5.8 Data processing and evaluation 757 VA Computrace – Software 117 Evaluation quantity calculation The peak evaluation quantity is identical for

5 Determination mode 757 VA Computrace – Software 118 Dilution calculation In all cases in which the sample volume is diluted in the measur-ing ves

5.8 Data processing and evaluation 757 VA Computrace – Software 119 Std.dev.(n) Standard deviation of the individual value EV(n) = s(n) c(n) – c

1.3 Installation 757 VA Computrace – Software 3 1.3 Installation Installation of software and VA Computrace Interface 1. Switch on PC and start

5 Determination mode 757 VA Computrace – Software 120 Rules for standard addition Standard addition is the usual calibration method for the major-i

5.8 Data processing and evaluation 757 VA Computrace – Software 121 Calibration curve calculation The content determination using a calibration c

5 Determination mode 757 VA Computrace – Software 122 a = Y.reg/offset Intercept of calibration curve b = Slope Slope of calibration curve in the

5.8 Data processing and evaluation 757 VA Computrace – Software 123 5. Calculation of result deviation MC.dev. The total deviation of the calcul

5 Determination mode 757 VA Computrace – Software 124 • Determining the working range The calibration curve is defined only for the range between

6.1 Computrace control 757 VA Computrace – Software 125 6 Manual control 6.1 Computrace control Computrace control selection MAIN WINDOW / Utili

6 Manual control 757 VA Computrace – Software 126 10 mA ... 100 nA Selection of current range for measurement in the manual control mode. I ovl

6.2 Dosimat control 757 VA Computrace – Software 127 6.2 Dosimat control Dosimat control selection MAIN WINDOW / Utility / Dosimat control Start

6 Manual control 757 VA Computrace – Software 128 Dosed volume (mL) [ read only ] Display of current volume dispensed since last filling (first v

6.3 Film deposition 757 VA Computrace – Software 129 Purge time (s) [ 0...80600 s ; 300 s ] Time of inert gas purging before the first measurem

1 Introduction 757 VA Computrace – Software 4 Installation of software and add-on board 1. Switch off PC and disconnect power cable from the powe

6 Manual control 757 VA Computrace – Software 130 6.4 Cleaning procedure Cleaning procedure selection MAIN WINDOW / Utility / Cleaning procedure S

6.4 Cleaning procedure 757 VA Computrace – Software 131 Start potential (V) [ -5...+5 V ; -1.2 V ] Start voltage for the cyclic conditioning

6 Manual control 757 VA Computrace – Software 132

7.1 Installation and program start 757 VA Computrace – Software 133 7 How to ...? 7.1 Installation and program start Install Dosimats for auto

7 How to ...? 757 VA Computrace – Software 134 7.2 User rights Define a new user 1. Open the USER RIGHTS window by clicking on MAIN WINDOW / User /

7.3 Signals in exploratory mode 757 VA Computrace – Software 135 7.3 Signals in exploratory mode Load a signal curve 1. Click on or MAIN WI

7 How to ...? 757 VA Computrace – Software 136 7. Set pretreatment parameters for electrodes (see Pretreatment, section 3.4). 8. Set Sweep paramet

7.3 Signals in exploratory mode 757 VA Computrace – Software 137 5. Set the start and end base points for baseline evaluation by clicking the

7 How to ...? 757 VA Computrace – Software 138 7.4 Methods in determination mode Load a method 1. Click on or MAIN WINDOW / Mode / Determinat

7.4 Methods in determination mode 757 VA Computrace – Software 139 Edit the working method 1. Click on or MAIN WINDOW / Mode / Determination

1.3 Installation 757 VA Computrace – Software 5 Software upgrade with add-on board If you want to upgrade from the 757 VA Computrace 1.0 software

7 How to ...? 757 VA Computrace – Software 140 6. Enable the Measure blank option, enter the number of meas-urements No. of blanks and the Blank pu

7.5 Determinations 757 VA Computrace – Software 141 7.5 Determinations Load a determination 1. Click on or MAIN WINDOW / Mode / Determinatio

7 How to ...? 757 VA Computrace – Software 142 5. Place the analysis solution in the measuring vessel at the 757 VA Computrace Stand. 6. Click on

7.5 Determinations 757 VA Computrace – Software 143 12. The sample solution spiked with standard addition solution is measured three times. Then

7 How to ...? 757 VA Computrace – Software 144 12. Transfer the desired sample amount into the sample vessels. Place the sample vessels at the odd

7.5 Determinations 757 VA Computrace – Software 145 11. Close the EDIT WORKING METHOD PARAMETERS window by clicking <OK>. The determination

7 How to ...? 757 VA Computrace – Software 146 7.6 Standard addition technique Use manual standard addition without solution exchange In the manua

7.6 Standard addition technique 757 VA Computrace – Software 147 15. Enter the Sample ID (used as part of the determination file name) in the PLA

7 How to ...? 757 VA Computrace – Software 148 13. Start the measurement by clicking the icon in the MAIN WINDOW or the button in the MONIT

7.6 Standard addition technique 757 VA Computrace – Software 149 13. If the standard addition should be done with variable addition volumes, clic

1 Introduction 757 VA Computrace – Software 6 11. Restart the PC. 12. Connect the built-in add-on board to the "PC Interface" socket of

7 How to ...? 757 VA Computrace – Software 150 7.7 Calibration curve technique Record calibration curve manually by adding standard solution This

7.7 Calibration curve technique 757 VA Computrace – Software 151 15. Enter the Calibration curve id (used as part of the determina-tion file name

7 How to ...? 757 VA Computrace – Software 152 13. Start the measurement by clicking the icon in the MAIN WINDOW or the button in the MONIT

7.7 Calibration curve technique 757 VA Computrace – Software 153 variable addition volumes in the Addition fields, and close this window by click

7 How to ...? 757 VA Computrace – Software 154 10. Start the measurement by clicking the icon in the MAIN WINDOW or the button in the MONIT

7.8 Work with film electrodes 757 VA Computrace – Software 155 7.8 Work with film electrodes Deposit a mercury film You find a suitable method f

7 How to ...? 757 VA Computrace – Software 156 7.9 Diagnostic procedures Check the purging 1. Connect the inert gas to the 757 VA Computrace Stand

7.9 Diagnostic procedures 757 VA Computrace – Software 157 8. Select SMDE and click on . 9. A small drop is formed and removed in intervals.

7 How to ...? 757 VA Computrace – Software 158 Perform a peak test with the dummy cell For testing the peak measurement, the dummy cell of the 757

7.9 Diagnostic procedures 757 VA Computrace – Software 159 Perform a GLP test The requirements of GLP (Good Laboratory Practice) include the peri

1.3 Installation 757 VA Computrace – Software 7 5. Make hardware settings for the 813 Compact Autosampler (see Automation, section 2.7). 6. Mak

7 How to ...? 757 VA Computrace – Software 160 15. Use a pipette to add 100 µL Pb ion standard solution ρ(Pb) = 1 g/L (Metrohm No. 6.2301.100) into

8.1 General procedure for error messages 757 VA Computrace – Software 161 8 Troubleshooting 8.1 General procedure for error messages Error messa

8 Troubleshooting 757 VA Computrace – Software 162 8.3 Software problems Error message "No access to software" If the login fails because

8.4 Dosimat problems 757 VA Computrace – Software 163 Irreproducible standard additions with 765 Dosimat 1. Click on or MAIN WINDOW / Utilit

8 Troubleshooting 757 VA Computrace – Software 164 8.5 General rules for VA trace analysis Chemicals and equipment 1. The purity of the reagents

8.5 General rules for VA trace analysis 757 VA Computrace – Software 165 Samples 1. The amount of sample depends on the concentration of the ele

8 Troubleshooting 757 VA Computrace – Software 166 Selection of VA Measurement mode The following points should be considered by selecting the VA m

8.6 Voltammetric problems 757 VA Computrace – Software 167 8.6 Voltammetric problems Low background current or unstable baseline With all types o

8 Troubleshooting 757 VA Computrace – Software 168 4. Has the electrode been conditioned (e.g. by using Condition-ing cycles and Cleaning potentia

8.6 Voltammetric problems 757 VA Computrace – Software 169 Standard addition curves are not reproducible With all types of electrodes: 1. Check

1 Introduction 757 VA Computrace – Software 8 6. Close the VA Computrace software by clicking on or se-lecting File / Exit. 7. Switch on the

8 Troubleshooting 757 VA Computrace – Software 170 No peak found With all types of electrodes: 1. The peak is only displaced: adjust the half-wave

8.6 Voltammetric problems 757 VA Computrace – Software 171 With RDE/SSE: 1. The background current is too high: repolish the electrode. 2. The D

8 Troubleshooting 757 VA Computrace – Software 172 Standard addition peaks displaced With all types of electrodes: 1. Standard solutions have been

8.6 Voltammetric problems 757 VA Computrace – Software 173 Oxygen interference Oxygen can be electrochemically reduced and produces two waves in

8 Troubleshooting 757 VA Computrace – Software 174 Overcharging of the working electrode Under unfavorable conditions (high concentrations and/or l

8.6 Voltammetric problems 757 VA Computrace – Software 175 • Mercury determination at the gold electrode On prolongation of the enrichment time

8 Troubleshooting 757 VA Computrace – Software 176 Supporting electrolyte: Supporting electrolyte: 0.01 mol/L HClO4; pH = 2 acetate buffer pH

8.6 Voltammetric problems 757 VA Computrace – Software 177 mL analysis solution] would also give a clearly defined current peak for CuCl2–.) Su

8 Troubleshooting 757 VA Computrace – Software 178 Peak overlapping If the peak overlapping has reached a critical level at which the calculated pe

8.6 Voltammetric problems 757 VA Computrace – Software 179 Calibration with chemically non-isoformal standards With both possible calibration tec

1.4 Overview of program windows 757 VA Computrace – Software 9 1.4 Overview of program windows VA Computrace 2.0 consists of different windows w

8 Troubleshooting 757 VA Computrace – Software 180

Software license 757 VA Computrace – Software 181 Software license The use of the Software is subject to this License Agreement be-tween you and M

Software license 757 VA Computrace – Software 182 6. This Agreement applies until it is terminated. You can termi-nate this Agreement by destroying

Index 757 VA Computrace – Software 183 Index A Absolute substance mass ...105 AC...

Index 757 VA Computrace – Software 184 Contamination ... 165 Content calculation...

Index 757 VA Computrace – Software 185 E Edit Edit baseline ...98 Edit determination method paramet

Index 757 VA Computrace – Software 186 Load Load determination ... 94,141 Load method ...

Index 757 VA Computrace – Software 187 Predose ...87 Preparation procedures ...

Index 757 VA Computrace – Software 188 Software license... 181 Software upgrade ...

This manual was produced using RoboHelp® (eHelp Corporation). All Rights Reserved. Printed in Switzerland by Me

1 Introduction 757 VA Computrace – Software 10 1.5 Overview of file types The following file types are produced by the 757 VA Computrace software

2.1 Main window overview 757 VA Computrace – Software 11 2 Main window 2.1 Main window overview Main window elements The MAIN WINDOW is the cente

2 Main window 757 VA Computrace – Software 12 Main window icons It depends on the selected mode (exploratory or determination) whether the follow

2.2 Starting/closing the program 757 VA Computrace – Software 13 2.2 Starting/closing the program Starting the VA Computrace program Start the

2 Main window 757 VA Computrace – Software 14 2.3 File menu Method files Method files (*.mth) contain all the specifications and parameters for r

2.3 File menu 757 VA Computrace – Software 15 MAIN WINDOW / File / Save determination as ... Save the current determination loaded in the workin

2 Main window 757 VA Computrace – Software 16 Printing of reports and curves MAIN WINDOW / File / Print (Ctrl+P) Print reports and/or curves. D

2.5 Utility menu 757 VA Computrace – Software 17 2.5 Utility menu Computrace control selection MAIN WINDOW / Utility / Computrace control Start

2 Main window 757 VA Computrace – Software 18 User rights The «VA Computrace» program has a security system based on a list of user rights. For e

2.6 User menu 757 VA Computrace – Software 19 Password Change password for user. A " * " is displayed for each character entered. U

Table of contents 757 VA Computrace – Software I Table of contents 1 Introduction...

2 Main window 757 VA Computrace – Software 20 Use default locations Set default directories for Data folder and Method folder. Data folder Use

2.7 Settings menu 757 VA Computrace – Software 21 2.7 Settings menu General settings MAIN WINDOW / Settings / General Settings In the GENERAL SET

2 Main window 757 VA Computrace – Software 22 Hardware settings MAIN WINDOW / Settings / General Settings In the GENERAL SETTINGS window default

2.7 Settings menu 757 VA Computrace – Software 23 Dosimat no. [ on, off; off ] Check this checkbox for each Dosimat con-nected. Volume

2 Main window 757 VA Computrace – Software 24 Note: Method 2 must be set on the 813 Compact Autosampler. Time to move to sample (s) [ 30 s ; 25

2.8 Window menu 757 VA Computrace – Software 25 2.8 Window menu Tiling of windows MAIN WINDOW / Window / Tile All opened windows are tiled. Op

2 Main window 757 VA Computrace – Software 26 Display settings for Main window MAIN WINDOW / Window / Status bar Switch on/off display of statu

3.1 Electrodes 757 VA Computrace – Software 27 3 General settings for exploratory and determination mode 3.1 Electrodes MME MME stands for Mul

3 General settings for exploratory and determination mode 757 VA Computrace – Software 28 Voltage step timetHg dropsurface Notes: • In the explo

3.1 Electrodes 757 VA Computrace – Software 29 Notes: • In the exploratory mode, the SMDE can be used for all meas-urement modes except SqW, CV

Table of contents 757 VA Computrace – Software II 2.5 Utility menu...

3 General settings for exploratory and determination mode 757 VA Computrace – Software 30 RDE/SSE RDE stands for Rotating Disk Electrode and is

3.2 VA measurement modes 757 VA Computrace – Software 31 3.2 VA measurement modes DP – Differential Pulse General: DP or Differential Pulse volta

3 General settings for exploratory and determination mode 757 VA Computrace – Software 32 Sweep parameters: Hydrodynamic (measurement) [ on, o

3.2 VA measurement modes 757 VA Computrace – Software 33 SqW – Square Wave General: SqW or Square Wave voltammetry is primarly suitable for re-ver

3 General settings for exploratory and determination mode 757 VA Computrace – Software 34 Sweep parameters: Hydrodynamic (measurement) [ on, o

3.2 VA measurement modes 757 VA Computrace – Software 35 DC – Sampled Direct Current General: DC or Sampled Direct Current voltammetry is the clas

3 General settings for exploratory and determination mode 757 VA Computrace – Software 36 Sweep parameters: Hydrodynamic (measurement) [ on, o

3.2 VA measurement modes 757 VA Computrace – Software 37 NP – Normal Pulse (for "Exploratory" only) General: NP or Normal Pulse voltamme

3 General settings for exploratory and determination mode 757 VA Computrace – Software 38 Sweep parameters: Hydrodynamic (measurement) [ on, o

3.2 VA measurement modes 757 VA Computrace – Software 39 CV – Cyclic Voltammetry General: CV or Cyclic voltammetry is mainly used to investigate t

Table of contents 757 VA Computrace – Software III 3.5 Graphical settings...

3 General settings for exploratory and determination mode 757 VA Computrace – Software 40 Sweep parameters: Hydrodynamic (measurement) [ on, o

3.2 VA measurement modes 757 VA Computrace – Software 41 PSA – Potentiometric Stripping Analysis General: PSA or Potentiometric stripping analysis

3 General settings for exploratory and determination mode 757 VA Computrace – Software 42 Sweep parameters: Hydrodynamic (measurement) [ on, o

3.2 VA measurement modes 757 VA Computrace – Software 43 AC – Alternating Current Voltammetry General: AC or Alternating Current voltammetry is pr

3 General settings for exploratory and determination mode 757 VA Computrace – Software 44 Sweep parameters: Hydrodynamic (measurement) [ on, o

3.3 Potentiostat 757 VA Computrace – Software 45 Notes: • The AC measurement mode can be used with all types of electrodes. • The following co

3 General settings for exploratory and determination mode 757 VA Computrace – Software 46 2. Purging Optional purging of the sample solution dur

3.4 General operation sequence 757 VA Computrace – Software 47 Purging Purging means saturation of the analysis solution with an inert gas and is

3 General settings for exploratory and determination mode 757 VA Computrace – Software 48 • During the equilibration time, the start potential o

3.5 Graphical settings 757 VA Computrace – Software 49 3.5 Graphical settings Curve window elements All curve windows in the EXPLORATORY CURVES wi

Table of contents 757 VA Computrace – Software IV 5 Determination mode...71 5.1 Determina

3 General settings for exploratory and determination mode 757 VA Computrace – Software 50 Page properties The page properties of all curve window

3.5 Graphical settings 757 VA Computrace – Software 51 Axis properties The axis properties for the x and y axis of all curve windows can be set wi

3 General settings for exploratory and determination mode 757 VA Computrace – Software 52 Format Format for labels of the x or y axis. Check on

3.5 Graphical settings 757 VA Computrace – Software 53 Curve properties The drawing properties for all curves can be set with the appro-priate ...

3 General settings for exploratory and determination mode 757 VA Computrace – Software 54 Line properties Definition of line properties for axes

4.1 Exploratory mode overview 757 VA Computrace – Software 55 4 Exploratory mode 4.1 Exploratory mode overview Exploratory mode features The pro

4 Exploratory mode 757 VA Computrace – Software 56 4.2 Exploratory specification window Exploratory specification settings The EXPLORATORY SPECIFI

4.2 Exploratory specification window 757 VA Computrace – Software 57 Signal Selection of a signal file to be shown with the Selected signal prope

4 Exploratory mode 757 VA Computrace – Software 58 EXPLORATORY SPECIFICATION / File / Export voltammetric parameters ... Save the voltammetric pa

4.2 Exploratory specification window 757 VA Computrace – Software 59 Performing exploratory measurements Measurements in the exploratory mode can

Table of contents 757 VA Computrace – Software V 5.5 Results...

4 Exploratory mode 757 VA Computrace – Software 60 4.3 Exploratory curves Exploratory curves window The EXPLORATORY CURVES window shows all curves

4.3 Exploratory curves 757 VA Computrace – Software 61 Select signal curves One of the signal curves loaded into the EXPLORATORY CURVES window is

4 Exploratory mode 757 VA Computrace – Software 62 EXPLORATORY CURVES / Plot / Dynamic signal properties The properties of the dynamic signal curve

4.3 Exploratory curves 757 VA Computrace – Software 63 Signal cursor EXPLORATORY SPECIFICATION / Signal / Signal cursor Open the SIGNAL CURSOR wi

4 Exploratory mode 757 VA Computrace – Software 64 Options General parameters for peak evaluation. Manual Manual peak evaluation. The base po

4.3 Exploratory curves 757 VA Computrace – Software 65 or by pressing the ↑ or ↓ key. If the automatic peak evaluation is selected, n/a is displa

4 Exploratory mode 757 VA Computrace – Software 66 Table of results Display of peak evaluation results. No. Number of evaluation result. This num

4.3 Exploratory curves 757 VA Computrace – Software 67 Edit peak Modify the peak evaluation of an already found peak. The results are displayed i

4 Exploratory mode 757 VA Computrace – Software 68 Wave evaluation Automatic wave evaluation of recorded DC or NP signal curves. The results (posit

4.3 Exploratory curves 757 VA Computrace – Software 69 Start wave evaluation with the current parameters entered in the WAVE EVALUATION window.

Table of contents 757 VA Computrace – Software VI 6 Manual control...125 6.1 C

4 Exploratory mode 757 VA Computrace – Software 70 4.4 Printing in exploratory mode MAIN WINDOW / File / Print (Ctrl+P) Print exploratory specif

5.1 Determination mode overview 757 VA Computrace – Software 71 5 Determination mode 5.1 Determination mode overview Determination mode features

5 Determination mode 757 VA Computrace – Software 72 MAIN WINDOW / Window / Monitor (F7) The MONITOR window will be opened or (if it is al-ready

5.2 Working method specifications 757 VA Computrace – Software 73 MAIN WINDOW / File / Save method as ... Save the current method loaded in the

5 Determination mode 757 VA Computrace – Software 74 Remark2 [ 0...68 characters ; ] Remark 2 regarding the method. Calibration [ see below ;

5.2 Working method specifications 757 VA Computrace – Software 75 Drop size Drop size for SMDE or HMDE (see Electrodes, section 3.1). Stirrer

5 Determination mode 757 VA Computrace – Software 76 Cell volume (mL) [ > 0 mL ; 10 mL ] Total volume of solution (sample + auxiliary solu-t

5.2 Working method specifications 757 VA Computrace – Software 77 No. of replications [ 0...10 ; 2 ] Number of replications (= total number o

5 Determination mode 757 VA Computrace – Software 78 Substances The Substances tab of the EDIT WORKING METHOD PARAMETERS window contains parameters

5.2 Working method specifications 757 VA Computrace – Software 79 rameters are not displayed if Batch with solution exchange is selected for Tech

Table of contents 757 VA Computrace – Software VII 7.5 Determinations...

5 Determination mode 757 VA Computrace – Software 80 Nonlinear Regression (through Zero) The regression is calculated with a nonlinear cur-ve f

5.2 Working method specifications 757 VA Computrace – Software 81 Baseline The BASELINE window contains the settings for baseline evalua-tion for

5 Determination mode 757 VA Computrace – Software 82 Calculations The Calculations tab in the EDIT WORKING METHOD PARAMETERS window contains a tabl

5.2 Working method specifications 757 VA Computrace – Software 83 Calculation The CALCULATION window is opened if a new formula is added or an ex

5 Determination mode 757 VA Computrace – Software 84 Volume (mL) [ > 0.01 mL ; 0 mL ] Addition volume for each addition. Switch to the p

5.2 Working method specifications 757 VA Computrace – Software 85 Documentation In the Documentation tab of the EDIT WORKING METHOD PARAMETERS wi

5 Determination mode 757 VA Computrace – Software 86 Determination method Automatic printout of the method parameters used for the determination.

5.2 Working method specifications 757 VA Computrace – Software 87 Dosimats The automatic use of 665 or 765 Dosimats for the addition of so-lution

5 Determination mode 757 VA Computrace – Software 88 5.3 Monitor Start determination If no determination is running, the MONITOR window is used to

5.3 Monitor 757 VA Computrace – Software 89 Stop/Hold determination A running determination can be stopped, interrupted and contin-ued. Each step