1

Laboratory Start-Up Procedure

Turn-on the Computer

Start the PC by turning on the power. When the startup display appears enter the username and

password: Username: students, Password: power.

Turn-on the Lab-Volt Digital Acquisition Module (DAC)

The DAC is installed on the Lab-Volt test bench as shown in Fig. 1. It is powered by a 24 Vac

supply that is part of the main power supply. The DAC is connected to the 24 Vac power supply

Figure 1. Lab-Volt DAC and Power Supply.

DAC Module

Main Power Supply

24 Vac Power Cable Power-on LED

24 Vac Power Supply and

Switch

2

by a cable. When the 24 Vac supply is switched-on (red lever toggle switch), the DAC will turn

on and the green LED will be lit. It is important that the green LED on the DAC remain lit at all

times. If the power cable is disconnected, the acquisition software may stop recording test-data

or turn off completely.

Activate Data Acquisition Software on the PC

In order to start the Lab-Volt data acquisition software (LVDAC-EMS) click on the icon on the

desktop or use the sequence:

Start, Programs, Lab-Volt and LVDAC-EMS

After the program starts, the Module Selector panel will appear as shown in Fig. 2. The software

is configured for 60 Hz and the DAC is in the connected mode. Do not check the box marked

stand-alone mode. Click the box titled OK to continue.

Do Not check this box.

The DAC must be in

Connected Mode.

Choose 60 Hz

reference

frequency

Figure 2. Module Selector Panel.

3

LVDAC-EMS Start Screen

When the DAC screen appears make sure the caption Connected-Mode appears in the lower

right-hand side as shown in Fig. 3. Set the ranges if the voltage isolators (E1 etc.) and the

current isolators (I1 etc.) by right-clicking on the far-right column in the section titled Range.

Change the voltage isolators from Auto to High (800 V max). Change the current isolators from

the High range to the Low range (4 A max).

Change Voltage Ranges from

Auto to High

Change Current Ranges from

High to Low

The DAC must always be in

Connected Mode

Metering Icon

Figure 3. LVDAC-EMS Start Panel.

4

Start the Metering Function on the DAC

Click the Metering icon in the upper left-hand corner of the DAC display. The set of meters will

appear on the screen. Since the test circuit is not yet turned-on, leave PC in this mode and

continue to the next step – turning on the oscilloscope.

Turn-on the Oscilloscope

To power-on the LeCroy oscilloscope, press the start button at the lower left-hand corner of the

front panel as shown in Fig. 4.. Wait until the display prompts for username and password.

Enter the Username: students and Password: power. Wait for the initial display as shown in

Fig. 5 below.

Since the digital storage oscilloscope (DSO) is not yet connected to an active circuit, the trace

may not represent any useful information. The vertical scale of the traces for channel 1 and

channel 2 are adjusted in the subsequent steps. Note that at the bottom left-hand corner of Fig. 5

Figure 4. The LeCroy Oscilloscope

Start Button

5

there are two descriptor labels, one for each channel (C1, C2). Each label shows the vertical

scale of that channel and the offset from the main horizontal axis (x-axis). In the upper right

corner of each label there is an indicator of the type of coupling used by that channel. The labels

in Fig.5 show DC1M which means that the channel is dc coupled with a 1 MΩ impedance. This

is the preferred mode of coupling for this laboratory.

Adjusting the Vertical Scale of C1, Channel 1

Place the mouse cursor on the panel C1 in the lower left-hand corner of Fig. 5. Click to open the

panel shown in Fig. 6. This panel is used to set the format of the oscilloscope display for C1,

channel 1. Channel 1 has been set to correspond with the waveform that represents the phase

voltage of a power circuit. Using this panel the adjustments are made for the vertical scale,

offset, coupling, probe attenuation and labeling of the trace C1.

The scale of the y-axis is determined by first examining the ratio of the voltage-current isolator.

In this case the Lab-Volt isolator yields 10 Vdc for a maximum input of 300 Vrms. The output

Figure 5. Initial oscilloscope display.

6

of the isolator can be given by V1 where 𝑉1 = 208

300 ∙ 10. Since the range of the measured voltage

is 0 - 208 Vrms, the isolator will output V1 = 6.9 Vrms . If the positive y-axis has 4 divisions

then at 2.0 V/div. (8.0 Vdc) the 6.9 V requirement can be accommodated. Thus the volts/div

parameter is set for 2.0 V by using the arrows or by highlighting the numerical field or by

entering the value using the keyboard. The Offset parameter is set to 0.00 volts so that

measurements are made with respect to zero on the vertical axis (y-axis, ordinate). The center of

a sinusoidal waveform will be aligned with the major horizontal axis (x axis, abscissa) on the

screen.

Adjusting the Trace Thickness

The quality of the trace, the thickness, can be adjusted by making three adjustments. 1) In the

control panel of each channel, C1 and C2 there are controls to regulate a Noise Filter and the

Bandwidth. Also, in the Timebase control panel, the maximum number of points can be varied.

Click on a channel button, C1 or C2. In the lower right-hand corner of the panel that appears,

there is a tab labeled Noise Filter (ERes). Click on the tab and in the drop-down menu choose

the block +2.5 bits.

In the same channel control-panel there is a block labeled Bandwidth (upper center). Click on

this button and in the drop-down menu choose the entry for 20 MHz.

In the Timebase control panel click on the tab labeled Max Sample Points. In the drop-down

menu set the maximum number of points with either 500 kS or 10 kS for a very fine line..

7

The coupling-mode is adjusted by activating the panel labeled Coupling. This should be set to

DC and 1 MΩ input impedance (400 V max.). It is very important that this mode is used for

all measurements in order to protect the oscilloscope from damage. The 50 Ω input impedance

C1, Channel 1, Phase Voltage

C1, Click here to open the panel.

Use Label to attach information to trace.

Offset, Zero Offset

Vertical Scale, 2.0 Volts/div.Coupling is DC at 1 M Ohm

Probe Attenuation (multiplier)

Label: Phase Voltage

Label: Phase Current

Figure 6. Settings for C1, Channel 1.

8

can only tolerate 5 V rms maximum! The DC mode is used so that the screen will show both

the AC and DC components in a signal. The probe attenuation is set to ÷1 or a unity

multiplication factor. use the 1.0 A rms range. The calculation of the scaling factor for the

current should yield a setting of 1 V/div.

DC Coupling versus AC Coupling

Fig. 7 shows the difference between the DC coupling mode and the AC mode of the DSO. In

Fig. 7(a) the output voltage of a rectifier is composed of a 253 V dc component combined with

an ac ripple of 49 Vac peak-to-peak. The combination of the dc and ac components yields a

250 Vdc Offset

(a)

(b)

All values to be multiplied by 30

All values to be multiplied by 30

DC Coupling: DC + AC components

280 V

0 V

0 V

AC Coupling: AC component only

Figure 7. (a) DC coupling: dc voltage with ac ripple. (b) AC

coupling.shows only ac waveform and hides dc component.

9

waveform with a peak voltage of 302 Vpk and an RMS value of 280 Vrms. If the oscilloscope was

working in the ac coupling mode as shown in Fig. 7(b), the user could make the mistake of

thinking that the only voltage present was 9 Vrms (49 Vp-p). This situation could be hazardous if

the source of this waveform were connected to a load that could not withstand a 300 V peak

voltage or a dc voltage of 280 Vdc.

Adjusting the X-axis or Timebase

The scale of the x-axis can be adjusted by clicking on the Timebase panel shown in Fig. 8. The

sampling mode should be set to RealTime. The Timebase Mode must be adjusted accommodate

a 60 Hz signal. Since t = 1/f, each cycle will take 16.66 ms. There are two convenient time base

Timebase, y-axis control

Real-time mode 5 ms/div or 50 ms total time for x-axis

Label: Phase CurrentLabel: Phase Voltage

Figure 8. The timebase control panel.

10

values: 2 ms/div which shows a 20 ms time-span and yields 1 complete cycle and 5 ms/div

which spans 50 ms and 3 complete cycles. Set the time base to 5 ms/div since 3 cycles will be

required to compute some measurement functions.

In the Timebase control panel click on the tab labeled Max Sample Points. In the drop-down

menu set the maximum number of points with either 500 kS or 10 kS for a very fine line.

Setting the Trigger Function

Trigger is set to the positive-going edge of trace C1.

Phase Voltage is used as reference at t = 0 s with increasing positive value

Time t,

secTrigger at t = 0 s

Trigger source is C1, the phase voltage.

DC coupling shows DC and AC

components of waveform.

t = 16.66 ms

Edge Trigger

Label: Phase Voltage Label: Phase Current

Figure 9. The trigger control panel.

11

The trigger control section is opened by clicking on the small trigger panel in the lower right

hand corner of the screen as shown in Fig.9. For the experimental situations in the

undergraduate power lab the circuit analysis is referenced to the phase voltage and phase current

at the load. The first variable of interest is the phase voltage. The trigger will be set so that the

display of the oscilloscope will start at the instant that the phase voltage crosses the origin (t =

0.0 s, v = 0.0 V) in a positive direction. This point is at the center of the screen shown in Fig. 9.

In order to capture this moment the trigger is set to the Edge-Trigger mode. The source of the

trigger signal is set to channel 1, C1. The experiments in the undergraduate lab will use channel

1 of the oscilloscope, C1, to display the phase voltage. The capture of the reference signal is

synchronized with the rising edge of the reference signal as it crosses the x-axis in a positive

direction. Finally, The scope is set in the DC coupling mode. . If the source signal is very

noisy, the HFREG mode of Fig. 9 may have to be used along with the Pre-Processing,

Averaging, and Sweep command of Fig. 6. The number of sweeps is raised until a cleaner signal

is created. 4 or 5 sweeps may be required.

Measure Command

Label: Phase CurrentLabel: Phase Voltage

Figure 10 The Measure Function.

12

Waveform Measurements on the Oscilloscope

Start assigning the measurement functions by clicking on the Measurement command in the

upper toolbar shown in Fig. 10. Then start the measurement set-up by clicking the panel shown

in Fig. 11. The principal measurements are: the rms values of the waveforms and the phase

angle between two waveforms (a phase voltage and a phase current).

Start Measure Function

Label: Phase Current

Label: Phase Voltage

Figure 11. Start Measure Function.

13

The measurement selection display appears next as shown in Fig. 12. Each parameter to be

displayed on the screen must be chosen by activating a channel and the measurement function

that corresponds to that channel. By clicking on each panel associated with the block P1 a

separate menu will appear and the selection can be made from the function choices. In this case,

block P1, the channel is C1, channel 1. Clicking on the panel that indicates the word none will

open the menu shown in Fig. 13.

Activate the rms measurement command by scrolling and clicking the panel marked RMS. As

soon as the choice is made, the panel will close. The rms value of channel 2 is made by choosing

the RMS function as before. The assignment of channel 2 is done by clicking the block currently

connected to channel 1, C1, – a default condition – and changing the value to C2. The phase

angle between the two waveforms is found by starting the Phase measurement command. In this

case the channel assignments, C1 and C2 are done automatically since there are only 2 channels

available on this oscilloscope. Also, 3 cycles (50 ms) must be displayed on the screen for the

phase to begin operation. The final screen presentation will appear as shown in Fig. 14.

Click for RMS measurement

assigned to P1 (C1) and P2 (C2)

Click for Phase measurement

assigned to P3 (C1 and C2)

Figure 12. The Measurement Selection Panel.

14

Saving and Printing Test Results from the Oscilloscope

There are three ways to make a copy the screen of the LeCroy DSO for use in a lab report or

other document:

Select Measure Function

Select Channel(s)

Figure 13 RMS voltage and phase-angle measurement assignments.

Load Phase Angle

Figure 14. DSO screen with active measurement functions.

15

1. Use the Print Screen command from the keyboard. This will place the image on the

clipboard of the DSO. The oscilloscope screen can then be minimized and the Paint software

opened from the accessories pull-down menu in Windows.

2. Print the screen directly to the printer.

3. Save the DSO display directly to a file on the host PC (not the oscilloscope).

Do not attempt to save any data to a memory device connected directly to the Lecroy

oscilloscope. A USB memory stick will not function if connected to the oscilloscope and your

data may be lost.

To use options 2 or 3, click on the File tab in the upper toolbar. Open the Print Setup tab from

the pull-down menu as shown in Fig. 15. Use the Print Setup command to initiate the data save

sequence. The Print command will transfer the data to a location or device pre-determined by

the Print Setup options.

Choose Print Setup to print or save.

Figure 15. Print Setup command to save data from oscilloscope.

16

Transfer the screen image and data from the oscilloscope to the PC or storage media (USB

memory stick) using the functions shown in Fig. 16. The Print Setup has eight functions that

configure the output:

1. The File option transfers the chosen screen area to a file on the host PC.

2. The printer option prints the chosen screen area to a printer.

3. The print color is black and white for best definition.

4. A format can be chosen for the output file.

5. A name must be given to the outputfile.

6. The default target PC (the host PC on the test bench) is identified.

7. The area of the DSO screen is determined.

8. Start the printer or a file transfer operation.

File Option

Printer Option

Print in Black-White Target PC and Directory

File Name

File Format Screen Area to Copy

Start Printer or File Transfer

Figure 16. The LeCroy oscilloscope Print Setup and data-transfer screen.

17

To begin, decide how the information on the DSO is to be transferred – to the printer or to a file.

Activate the File icon to transfer the data from the LeCroy scope to the host PC on the test

bench. Activate the Printer icon to print the results directly.

Set the Color option to black and white if desired. Use the File Format panel to select the type

of data file –Bitmap (.bmp), JPEG (.jpg), Tagged Image File Format (.tif), Adobe Photoshop

(.psd), or Portable Network Graphics (.png). Enter the name of the saved file in the File Name

block. The Directory block shows the destination PC and directory. Do not change the

information in this field. Use the Hardcopy option to delimit the area of the screen to be saved.

Grid Area Only is the minimum area available. Activate the printer icon in the lower left-hand-

corner to start printing or transferring data

When the oscilloscope screen is copied to a file and printed, the image of the display is

transferred to the host computer. The file will appear on the Windows desktop display in the

directory My Documents. Figure 17 shows that the file transferred in Fig. 16,

Oscilloscope files in

Directory: My Documents

Files that have been

transferred in Bitmap format.

Figure 17. Files transferred from oscilloscope to directory My Documents on

desktop of host PC.

18

ManLabProc13a.bmp, is now displayed on the host PC, in this case, Conductance. The data file

can now be saved to an external memory device such as a USB memory stick.

Printing or Saving Files from the LeCroy Oscilloscope to the PC

Printing

On the oscilloscope click on the File tab in the menu on the left-hand-side of the display.

To print a screen image choose Print Setup on the oscilloscope. Make the following settings on

the oscilloscope display.

Choose Printer

Colors: Black&White

Select Printer: \\localpcname\HP Laserjet 1200 Series PCL5

The local printer could be \\redistortion\HP Laserjet 1200 Series PCL5

Hardcopy Area: Grid Area Only

Click on the printer icon in lower right-side corner to start printing.

Saving to a File on the Local PC

On the oscilloscope click on the File tab in the menu on the left-hand-side of the display.

To print a screen image choose Print Setup on the oscilloscope. Make the following settings on

the oscilloscope display.

Choose the File tab

File Format: Windows Bitmap 8bit (.bmp)

Colors: Black&White

Filename. Type in: yourfilename.bmp

Directory: \\localpcname\Student_Docs

The local printer could be \\redistortion\ Student_Docs

19

Hardcopy Area: Grid Area Only

Click on the printer icon in lower right-side corner to start transferring your file to the local PC.

The file will appear under

Computer →Libraries →Documents and yourfilename.bmp or

Desktop →Students Folder →My Documents and yourfilename.bmp

20

Connecting a Circuit with the Lab-Volt Equipment

A basic circuit diagram consisting of a source, a load and voltage and current measurement

devices is shown in Fig. 18. The labels and circuit element identifiers in this diagram correspond

to the markings on the panels of the Lab-Volt equipment. Note that there are three types of

measurement devices indicated by the component blocks:

1. Physical analog and digital meters are represented by circles and the letters V, A, or

DMM.

2. Transducers sense a voltage or current and send an isolated signal to the oscilloscope.

3. Transducers sense a voltage or current and send an isolated signal to the host PC.

The first type of meter consists of analog ac or dc voltmeters and ammeters. The digital

multimeter (DMM) is included in this group. The isolators designed to be used with the

oscilloscope are labeled with a lowercase letter and possibly a numeral placed inside a box.

Examples are i for a current isolator and e to indicate a voltage isolator.

The third type of transducer is located on the Lab-Volt digital acquisition and control module,

LVDAC, that is shown in Fig. 1. This unit isolates signals from the active circuit and transfers

them to the Lab-Volt software on the host PC. These circuit elements are represented as squares

with capitalized labels that are identical to the markings on the DAC. The letter-number

combination E1, for example, represents a voltage sensor.

Observe the standard polarity scheme when connecting the Lab-Volt meters and isolators. The

high or positive side of a meter is the red terminal (connection jack) or a jack with a value – 250

V, 0.5 A - associated with it. The low side of a meter or isolator is identified by the black

connector or a ± label. Thus a current enters an ammeter at the terminal colored red or marked

with a value (such as 0.5 A) and leaves at the terminal colored black or marked with the

character ±.

When wiring a circuit, connect the current path first and then add the voltage measurement

devices in parallel to a common set of high and low terminals. The current path should follow a

continuous series of connections from the source through the ammeters to the load. There should

not be any branches or splitting of the circuit. Do not jump or share terminals or connections at

21

the meters or isolators. For example, the low-side connection of an ammeter or current isolator

DMM

A

3 Phase

Variac

V 0- 208V

0- 208V

250Vac

4

5

6 I2

To DAQ

To DAQ

E2

I1

T o DAQ

To DAQ

E1

+

+

+

+

i

e

To Osc.

To Osc.

DMM

A

3 Phase

Variac

V 0- 208V

0- 208V

250Vac

4

5

6 I2

To DAQ

To DAQ

E2

I1

To DAQ

To DAQ

E1

+

+

+

+

i

e

To Osc.

To Osc.

Current Path

Current Path

Current Path

(a)

(b)

DMM

A

3 Phase

Variac

V 0- 208V

0- 208V

250Vac

4

5

6 I2

To DAQ

To DAQ

E2

I1

T o DAQ

To DAQ

E1

+

+

+

+

i

e

To Osc.

To Osc.

(c)

Figure 18. The basic circuit diagram: (a) the schematic, (b)

the current paths, (c) current and voltage meter connections.

22

should not be shared with the high side of a voltmeter. The terminals of the voltmeter should be

connected directly to the corresponding terminals of the device or source that is being measured.

This strategy will use more wires but it will result in fewer errors and the circuit will be easier to

troubleshoot.

Using the Lab-Volt Metering Function

Before starting the Lab-Volt metering, open the Windows Excel spreadsheet software. The data

collected in the Lab-Volt data table will be transferred to Excel for calculation and plotting. The

Lab-Volt start screen was opened at the start of this exercise. Click on the Metering icon at the

top of the display. The meters will appear as shown in Fig. 19. Note the default settings of the

Metering Icon opens the metering display

Start the data table

Continuous Refresh buttonMeter, M1, is voltmeter E1 on the DAC

E1 is measuring Volts

E1 is measuring ac rms values

Ammeters set to low range

Voltmeters set to high range

The software and PC are always in Connected Mode

Figure 19. The Metering window.

23

meters. Meter M1, is set to correspond to the DAC connections for E1. This meter is set to

record ac, rms voltages. To start the meters click on one of the refresh buttons. The continuous

refresh button will update the values of the meters every second. Note that the voltmeters have

been set to the high range (800 V) and the ammeters set to the low range (4 A).

Using the Lab-Volt Data Table The Data Table and the set-up menu (Record Settings) are shown

in Fig. 20. Open the data table with the icon in the toolbar at the top of the window. Activate

the columns (A, B, C etc.) by checking the appropriate meters in the Record Setting window.

x

x

x

Click on the Record Settings icon to open the setup window

Click on the Data Table with Pencil icon to record measurements

Click on M1-E1 assign column A to meter M1

Click on M13 to assign column

C to measure power for E1-I1

Click on M7-I1 to assign column B to meter M7

Plot command for data table

START the data table with this icon

Figure 20. Setting up the data table window.

24

Measurements can be recorded by clicking the icon that features a pencil. This action will

transfer the values shown in the metering panel to the Data Table. Note that the metering panel

also has a button that allows the data to be transferred without maximizing the Data Table.

Figure 21 shows an example of the Data Table with meters assigned to the columns. One set of

data has been recorded. Note that after the data is recorded, the rows in the data table can be

highlighted and copied (to the clipboard). Once copied, the information can be pasted in to an

EXCEL spreadsheet.

Transferring Data to Excel

Figure 22 shows a row of data that has been pasted into the Excel spreadsheet. The first row has

been left blank so that the column headings can be copied from the Data Table. The data should

Click here to Record Data from Metering

Plot Data function

Recorded value of meter M3 which is

assigned to voltage isolator E3

(Vac,rms)

Column D assigned to

meter M7

Figure 21. The Data Table with columns assigned to meters. A set of

measurements is recorded in the first row.

25

be transferred from the Data Table regularly and the Excel sheet should be saved so that no

information is lost if the Lab-Volt metering or the DAC are interrupted. Safeguard the

experimental data by updating and saving the spreadsheet regularly. The Excel platform

can be used to perform calculations related to the experimental results. Also, the Excel software

can be used to plot the experimental performance curves.

Plotting Data with Excel

Experimental data that has been copied from the Lab-Volt data table can be plotted after it has

been transferred to the Excel spreadsheet. Figure 23 shows a data set on an Excel spread sheet.

In order to plot a single set of data – an x-axis and a single y axis – two columns, A and B, have

been highlighted (step 1). The first values contained in column, A, will become the x-axis and

column B will be the y-axis. Next, the Insert tab is clicked on the upper toolbar (step 2). The

Scatter plot with a smooth curve is chosen (steps 3 and 4). The result is shown in Fig. 24. Note

Data copied and pasted from Lab-Volt Display

Column Headings must be typed in same order as Lab-Volt table

E1, Vac I1, Aac

Notes typed in Excel sheet

Figure 22. The Excel spreadsheet.

26

that the plot does not have a label for the data, the axes, or the plot itself. The next step is to

identify the curve and the source of the data from the spreadsheet.

The labels can be added to the plot or edited by using the Chart Tools function. First click on the

plot area to activate the chart panel (step 1). Then choose the Layout tab in the upper toolbar

(step 2). By activating the icons named Axis Titles and Chart Title, the axes can be labeled (step

3). The new title for the x-axis is shown in step 4. To change the text of the Series Title the

following sequence is followed: click the series title text. A box containing the text will appear.

Right click on the box. Choose Select Data from the menu that appears. Next a panel titled

Select Data Source will appear. In the Select Data Panel highlight the text: Series 1. Now

choose the edit tab. Change the series name and click OK to close the window. This procedure,

changing the text of the Series Title (step 5), is shown in Figs. 27 and 28.

1. Highlight 2 columns. Column A is the x-axis.

2. Click on INSERT 3. Click on Scatter

Plot.

4. Choose smooth curve.

Figure 23. Plotting data.

27

Creating plots that use 2 axes is sometimes necessary to compare curves or make calculations

directly from the plot. The procedure is shown in Figs. 25 and 26. Three columns of data are

highlighted in the Excel sheet. The Insert and Scatter Plot functions are used as shown

previously. As shown in Fig. 25, one curve (column B, Iph) is unreadable because the scale of

the y-axis, taken from column C, is too large. To correct this situation, a second y-axis must be

added.

To create a second axis first click on the curve that requires the new axis (step 3). Right click on

this curve and a menu appears. Choose Format Data Series from this menu. A Format Data

Series panel will appear (step 6). Choose the button: Secondary Axis to create the new y-axis.

1. Click on the plot figure.

2. Choose Layout on Toolbar.

3. Choose Axis Titles.

4. New axis title .

5. Series title .

Figure 24. Adding labels.

28

The result is shown in Fig. 26. The values of the new secondary axis appear on the right side of

the plot. Note that the phase-current trace, Iph, is marked by a series of linked symbols. Figure

26 shows the plot with a second y-axis added on the right side of the figure.

Using the Lab-Volt Phasor Analyzer

The Lab-Volt software includes several useful utilities that correspond to standard methods of

representing and analyzing electrical power circuits. The phasor analyzer display is shown in

Fig. 27. The utility is activated by clicking on the icon located on the upper toolbar. After the

screen appears the circuit parameters are chosen from the menu on the right. In this case the

angle between a phase voltage, E1, and a phase current, I1, is shown. Note that the phase

1. Three

columns to be

plotted.

Highlight the

columns. Use

INSERT and

SCATTER to

plot.

2. Columns B, C are on

same y-axis. Column B,

Data Series 1, can’t be

seen.

3. Click on curve B, Data Series 1.

4. Format Selection, Series 1, appears.

5. Format Data Series command.

6. Data Series 1 is

initially assigned

to Primary Axis.

Click on

Secondary Axis to

create new axis.

* Column A is the x axis.

Figure 25. Creating a plot with two axes.

29

voltage E1 is chosen as the reference phasor. The load angle is shown at the bottom of the

display. The angle is associated with the current and appears under the column labeled Phase.

Using the Lab-Volt Harmonic Analyzer

The Harmonic analyzer display is shown in Fig. 28. The utility is activated by clicking on the

icon located on the upper toolbar. After the screen appears the circuit parameters are chosen

from the menu on the right. In this case the frequency of the fundamental is chosen from the

default system value of 60 HZ. The parameter to be analyzed is the phase current and the

harmonic components are given as amperes. The components could also be evaluated as

percent’s of the fundamental. The number of harmonics to be evaluated is 10 with the possibility

of measuring a total of 40 components.

Fig. 26. Figure with phase current, Iph, assigned to second axis.

30

Fig. 28. The Harmonic Analyzer. 1

Fig. 27. The Phasor Analyzer.

31

Using the Lab-Volt Oscilloscope

The Lab-Volt software includes an oscilloscope that is activated by an icon in the upper toolbar.

This utility functions in the same manner as an actual instrument.