(347) Output voltage is not within specified limits
(361) Overvoltage
(364) Measured capacitances don't match
(365) Specimen capacitance below limit
(366) Specimen capacitance above limit
(367) Measured DC current > MaxDCCurrent
(368) Measured hum current > MaxHumCurrent
IDAX is an insulation diagnostic system for investigations/analysis of dielectric materials,
normally insulators. The measurement method used is dielectric spectroscopy, i.e. measurement
of the dielectric properties of the material as a function of the frequency, and in some cases
also as a function of the voltage. By studying the dielectric material properties as functions of
frequency it is possible to make a distinction between different types of phenomena. For
example, it is possible to separate polarization loss from leakage currents.
The system applies a sinusoidal voltage with desired frequency over the sample. This voltage
will generate a current in the sample. By accurately measuring the voltage and the current, the
sample impedance can be calculated. Depending upon the actual sample model, various
parameters can be calculated from the impedance, such as capacitance, loss, resistance etc. This
procedure can then be repeated at the specified frequencies and voltage levels and even more
information on the sample can be revealed. More information can be found in the chapter
"Measurement technique".
The system is fully computerized and most of the measurements can be performed
automatically.
More technical and safety details are given in sections:
Specifications
System and accessories
Safety precautions
1.1.1
1.1.1.1
Specifications
The Insulation Diagnostic System IDAX measures the insulation impedance, at different
frequencies, for insulation materials present in high and medium voltage transmission and
distribution networks. The measurement results are used for insulation diagnosis.
The IDAX uses voltages up to 200 Vpeak (~140 V RMS). The voltage range can be increased by
adding an external high voltage unit (the high voltage unit is specified separately).
IDAX-300 Specifications
General
The Insulation Diagnostic System IDAX-300 measures the insulation impedance, at different
frequencies, for insulation materials present in high and medium voltage transmission and
distribution networks. The measurement results are used for insulation diagnosis.
The IDAX-300 uses voltages up to 200 Vpeak (~140 V RMS). The voltage range can be increased
by adding an external high voltage unit (the high voltage unit is specified separately). The
IDAX-300 is operated using an external laptop/PC.
The IDAX-300 uses a three electrode set-up, which allows for measurements of non-grounded
as well as grounded objects with and without guard.
The IDAX-300 system applies sinusoidal shaped voltages at different frequencies across the test
object and simultaneously measures the current through it. The output voltage is either taken
from a 10 V
A "Warning" statement denotes hazardous conditions and actions that can cause bodily
harm or death.
A "Caution!" statement denotes conditions and actions that can damage the IDAX or the
equipment being tested.
Warning!
Always follow local safety regulations when working on high voltage equipment.
Make certain all personnel working with IDAX have been trained in its correct use
and that all applicable safety precautions are taken.
BEFORE connecting this unit to the mains outlet user must verify that only a single
protective ground systems exists AND no measurable voltage potential exists
between the mains outlet protective ground and the test object protective ground. If
a voltage potential is found between mains outlet protective ground and the test
object protective ground then additional measures described in local safety standards
should be applied to ensure personal safety.
The measurement system can generate hazardous and even lethal voltages.
Do not attempt to service the IDAX yourself as opening or removing covers may
expose you to dangerous voltage.
Do not use any accessories that are not intended for use together with the IDAX.
Unplug the IDAX from the mains supply when it is left unattended or not in use.
Before cleaning, unplug the IDAX from the mains supply. Use a damp cloth for
cleaning. Do not use liquid or aerosol cleaners.
Caution!
Make sure that the mains voltage selected on the selector switch located on the back
panel corresponds to the voltage level before connecting the mains.
Refer all servicing to qualified service personnel.
If you need to return your IDAX, please use either the original crate or one of
equivalent strength.
The IDAX-206 come with the measurement and display software already installed on the
internal computer. On the IDAX-300 and if you want to use the IDAX-206 with an external PC
you have to install the software.
To start installing the software insert the USB memory stick and run the program IDAXInstallXXXX.exe from it.
When first starting the IDAX software after installing it make sure the IDAX206/300 is
connected and turned on. For the IDAX-206 also check that the switch in the rear panel is set to
EXT USB. When the software starts it will look for the IDAX hardware and connect to it
automatically.
Measurement Technique
Short overview of measurement principle is given in this section.
How impedance is measured Gives basic principle of IDAX operation
Sample modelingDescribes theoretical models used for presenting measurement
results
How Impedance is Measured
IDAX measures impedance. By measuring the impedance at one point, i,e, at a specific
frequency and amplitude, parameters such as resistance, capacitance and loss can be calculated.
The impedance of a sample is measured by applying a voltage across the sample. This voltage
will generate a current through the sample. By accurately measuring the voltage and the
current, the impedance can be calculated, see illustration below.
Computer with
DSP-board
Voltage source
Control voltage
Sample
ZU
I
Measured voltage
ElectrometerVoltmeter
AV
Measured current
Fig.1. Measurement of electrical impedance.
The impedance is calculated using Ohm's law:
where Z, U and I are complex entities.
The voltage (and the current) is generated by a voltage source. There are currently two internal
voltage sources available in the IDAX system, which can deliver a maximum peak output of
10 Vpeak and 200 Vpeak, respectively. The voltage is measured by means of a voltmeter and
the current is measured by an ammeter or electrometer which acts as a current-to-voltage
converter. The analogue signals (voltages) are then converted to digital samples of the signals
that are used in subsequent calculations.
1.4.2
Sample Modelling
The impedance, Z, can be presented directly or by using different impedance models. Two ways
of presenting Z directly are the polar and the rectangular, as follows:
Polar:
Rectangular:
Two simple models which are usually used in circuit analysis, although more seldom in
insulation analysis, are capacitance, C, and resistance, R. The equivalent RC circuit models
available are series and parallel models (see Fig.1) calculated as follows:
a) b)
Fig.1. Equivalent circuit models: a) series RC circuit, b) parallel RC circuit.
Parallel:
Series:
where w = 2pf and f is frequency.
Another model, more often used in insulation diagnostics, is the complex capacitance model
describing the insulation impedance as a complex capacitance, where the imaginary part of the
capacitance represents the losses. The complex capacitance model is defined as follows:
The DC' is defined as the capacitance, C', with an arbitrary constant k (usually negative) added.
The aim of this parameter is to make it possible to distinguish between small changes in
capacitance in graphical presentation.
A model, very often used in insulation diagnostics, is a description of the insulation impedance
as a capacitance combined with a dissipation factor, tand, or a power factor (PF or cosj). The
capacitance, tand and cosj/PF are defined as follows:
C, PF, Tan-Delta:
If tand and cosj (PF) are small, then tand » cosj = PF (E.g. tand=0.1 corresponds to PF=0.0995)
Insulation diagnostics is based on material characterization and therefore material models are
often used. To be able to define material parameters from measured impedance Z the
geometry of the sample, described in terms of the geometrical capacitance C0, has to be
defined. In the illustration below, a vacuum (or air-filled) capacitor of defined geometry is
shown. Since no "material" is between the electrodes, the capacitance of a) is the geometrical
capacitance.
UC
I
a)b)c)
Material parameter models based on a geometrical capacitance C0 and material parameters.
In the above illustration b) and c) a material is inserted between the electrodes and it will
influence the current, I, flowing in the circuit. The influence of the material can be described by
different parameters using either a dielectric model or a conductive model. In the dielectric
model the "material capacitance", the permittivity, is a complex function describing both the
capacitance and the loss. Whereas in the conductive model the capacitance is described by a
permittivity and the loss by a conductivity (or resistivity). The dielectric and resistive models are
derived as follows:
If geometrical capacitance, C0, is unknown it can be set by the user by entering a permittivity
(dielectric constant), e', for the material. Entering a permittivity, e', will let the system calculate
an approximate C0 making use of the material models available. Yet, one must be aware that
the accuracy of the absolute values are limited by the accuracy of the entered permittivity. If
the geometrical capacitance is unknown and an approximate permittivity is given, the
geometrical capacitance is calculated as follows:
The impedance value, Z, used in the calculation is the first measurement point in the actual
measurement.
Getting Started with IDAX
This describes how to perform a diagnostic measurement on a specific test specimen. More
details about the software functions can be found in IDAX System Control and IDAX Results.
It is recommended to start using IDAX by going through the procedure in this section in order
to become familiar with the instrument and the software. This procedure is also a good test to
perform whenever a confirmation of the proper functioning of the instrument is required. This
test is executed using the standard equipment delivered with IDAX.
Before starting to use IDAX certain preparatory procedures must be followed.
1. Before connecting IDAX instrument power cord to the mains outlet:
read the safety precautions
§
connect the transparent ground lead to a protective earth (ground) close to measurement
§
specimen and to panel of instrument.
2. Connect IDAX instrument to a mains outlet which meets the requirements in User's Manual
and local safety regulations, and switch on IDAX instrument using the mains switch POWER
on the front panel.
Preparatory Procedure: Specimen
1. All specimen capacitances must be discharged before connecting IDAX leads. This means that
all specimen electrodes must be short circuited and grounded. The electrodes must remain
grounded until IDAX leads are connected. Below a general picture of ground connections is
shown.
1.5.1
2. In the case of Test Capacitor, keeping the electrodes grounded while connecting IDAX leads
is complicated. Therefore, in this particular case with Test Capacitor, it is permitted to remove
the ground connections before connecting IDAX.
Measurement
Make sure that IDAX is properly connected to mains outlet.
1.
Turn on IDAX using the mains switch POWER on the front panel. The IDAX performs a
2.
self-test and start-up procedure.
Activate the Results window if not active after start-up.
3.
In Results create new object selecting Object from menu File / New. Click "Browse" and
4.
select !!Test Capacitor.obj template and enter arbitrary name as Object Name, for example
"Test" and click OK.
By default all measurement templates listed as Associated Measurement Templates will be
5.
available for performing the measurements. It is possible to deselect one or more
measurement templates from Associated Measurement Templates. As shown in picture
below, four Measurement Templates !!C10 (GST-Guard), !!C12 (UST), !!C12, C10, C10+C12
and !!C20 (GST-Guard) are associated with the object "Test" for IDAX-206, similar procedure
as IDAX-300.
Fill in available fields with relevant information.
Create new measurement sequence selecting Measurement Sequence from menu File /
New. Arbitrary name can be entered as Measurement Sequence, for example "Getting
Started" and press OK. New measurement sequence with corresponding Measurement Plan
files will appear in Test Browser.
Page 14
IDAX User's Manual14
Fill in available fields with relevant information.
8.
1.5.1.1
Test Sequence for IDAX-300
This is Getting Started test sequence when using IDAX-300
The specimen to be measured using the built-in capacitance box built into the system that
terminates at the front panel. The respective capacitances are:
C10 = ~2.5 nF
C12 = ~4.7 nF
Warning!
The measurement system can generate hazardous and even lethal voltages.
In Test Browser select Measurement Plan file !!C10 (GST-Guard), carefully read and follow the
instructions. Alternatively, follow the instructions below.
Make sure that preparation procedures have been followed (see also "Ungrounded Specimen
1.
Test (UST) Measurement").
1.5.1.2
Connect the generator output to the upper capacitance connector.
2.
Connect Current 1 and Sense 1 to the lower capacitance connector.
3.
Remove possible ground connections from the connection pins.
4.
Turn on the output switch activate the output and then start the measurement.
5.
Wait until measurement is finished or abort earlier by stopping the measurement.
In case of a two winding transformer the set-up of IDAX-206 (IDA 200) and IDAX-300 are very
similar; the leads need to be moved between test 2 and test 3.
In case of a three winding transformer the IDAX-300 second input channel is utilized (standard);
the leads need to be moved between test 2 and test 3, between test 4 and test 5. If use
IDAX-206 (IDA 200) on a three winding transformer, the leads need to be moved between every
test.
If using IDAX-300 with two electrometers (option), the two set-ups using same cable set-up can
be measured simultaneously, e.g. test 1 and test 2 (test 3 and test4; test 5 and test 6).
Note that Test 6, CTH (Energize T and measure H), in many cases are replaced by CHT (Energize
H and Measure T):
· IDAX-300: CHT,UST-2, H, L, T (same cable set-up as Test 1 and Test 2)
· IDAX-206: CHT,UST, H, T, L shorted to tank
During Measurement
When the measurement has been started the measurement file icon changes to an icon
corresponding to the data file.
1. By pressing <F4> on the keyboard, Results window can be activated if not already active and
the measurement progress can be viewed when selecting Graph tab. The graph shows the
dissipation factor for the Test Capacitor in the frequency range 0.1 - 1000 Hz .
2. By pressing <F5> on the keyboard, an oscilloscope will be displayed on the screen. The Ch 0
(red) signal in the oscilloscope displays the applied voltage over the sample, Ch 1 (white) is
the output voltage from the first electrometer and Ch 2 (blue) is the output voltage from the
second electrometer. The output voltage from the electrometer is a function of the current
through the sample.
3. The instrument stops automatically after the last measurement point is completed, however,
the measurement can be interrupted earlier by a stop command. You can press stop button
or, on the IDAX-206, the OUTPUT OFF button. On the IDAX-206 a lit green READY LED on
the front panel indicates that the measurement is stopped or finished.
By default the measurement data is presented using a model defined in the measurement plan.
However, additional models can be added while inspecting the results (see Selecting Models for
details).
Depending on which parameters are of interest to the user, the measurement data can be
presented using different models. E.g. in the tand model the dissipation and/or power factor as
well as capacitance can be displayed in the graph as a function of frequency. See also how to
select models in sections "Configuration / Models" and "Sample Modelling".
The results can be viewed using three additional tabs: Graph, Table and 50/60 Hz data as
shown in pictures below.
2. In the Graph tab you can select the desired parameters. For example, the dielectric
parameter e'.
3. In Results window menu the choices File / Export, File / Print and File / Report allow for
exporting the measurement data and creation of reports.
All measurements are stored on the IDAX 206 system hard disk or the measurement computer's
hard disk on an IDAX-300 system and can be opened and analysed at any time. For comparison
purposes, many measurements can be loaded into the same Results window.
IDAX System Control
The IDAX System Control performs a measurement according to commands pre-arranged in a
Measurement plan or command file (C-file), using programming syntax described in IDAX
Command and Variable References. The Measurement plan used is available in Results tab
Measurement plan.
Editing of measurement plans and displaying the results.
Window is activated after up-start by default
Comments
Adding comments to the actual measurement.
Messages
Displaying messages from the software during a
measurement.
Oscilloscope
Viewing the actual voltage and current curve forms.
In addition to the IDAX System Control program window, a few more windows are accessible
from here.
1.6.1
1.6.2
1.6.3
Message Window
Messages from IDAX system to the user will be displayed in the Messages window. For example,
if a measurement was aborted prematurely by the program, the reason for it will be displayed
here.
Connect and Disconnect
In the File menu you have the choice to connect (if not connected) and disconnect (if
connected) to the IDAX unit. If you are not connected and the software needs to connect to the
IDAX unit it will be done automatically.
Oscilloscope
The Oscilloscope displays the signals present on channel 0 (white, Ch0) and channel 1 (red, Ch1)
inputs of the analogue IO unit.
The Ch0 and Ch1 check boxes select the channels that are displayed. Trace 0, white, is
proportional to the sample voltage. Trace 1, red, shows the electrometer output voltage, which
is a function of the input current.
1.6.4
Horizontal control
The oscilloscope time base can be set either on auto scale or manual. On auto scale, the time
base is set from the generator signal from the DSP. In the manual mode, the time base is set by
the Time/div slide bar. The time above the slide bar refers to the time per division, the full
oscilloscope window width consists of ten divisions.
Roll
The Roll check box can be used for slow signals that the oscilloscope may otherwise have
difficulties to accurately lock.
Vertical control
The gain of the input channels can be adjusted with the two vertical slide bars next to the Grid
check box at the oscilloscope window. The voltage range is displayed beside the Ch0 and Ch1
check boxes. The offset of the displayed signals can be adjusted by placing the mouse pointer
inside the oscilloscope window and dragging it up and down while holding the mouse button.
Grid
The Grid check box displays or hides the grid.
Changing Language
The language in which IDAX user interface (IDAX software) is displayed can be changed. The
following languages are available:
English
§
Swedish
§
German
§
French
§
Spanish
§
Language is changed selecting menu Configuration / Change Language in IDAX System
Control, which opens a file opening dialog. The selected language file, *.lng, is loaded and it
will be used after restarting the IDAX program. Each language has its own language file, *.lng,
and all language files are located in the directory D:\IDA\Language files\.
Capacitance between
centre conductor and
middle shield
Cap. between
conductor and
shield
Cap. between
conductor and
shield
-----
C23
(Farad)
Capacitance between
middle shield and outer
shield
-----
-----
-----
In addition to IDAX interface language, the language of Measurement Templates is changed if
a translation is available. The translation files are stored in directory D:\IDA\Language files\.
1.6.5
Test Leads
The Test Leads dialog is used to select and, possible edit the settings for different cable sets.
The presets drop-down is used to select what cable set you are to use for a measurement. If the
cable set you are planning to use is not included you can use the “Add” button to add a new
preset.
1.6.6
The settings for a cable set can be edited. What the different settings means is explained in this
table.
About
In "About" window the software versions of installed IDAX system, its program components
and information about the operating system are displayed.
The IDAX system presents its measurement results derived from measured voltage and current.
Therefore, the IDAX system should mainly be calibrated with voltage and current standards.
Calibration of the IDAX-206 system is performed using an external calibration box containing
voltage, current and impedance references. The system can be calibrated against the calibration
box every year or every 6 months. On the other hand, if the system is used and stored outside
certain temperature/moisture limits, more frequent calibration is recommended.
The system may also require more frequent calibration to compensate for exposure to
temperature gradients during measurement work, or if the calibration temperature differs too
much from the ambient temperature. Moreover, one may recommend more frequent
calibration if tighter accuracy specifications are to be met. Using the external calibration box for
calibration of the system makes it possible to always have a calibrated system which eliminates
the need to send the whole system away for calibration. The only thing that needs to be sent
away is the external calibration box. It is recommended to calibrate the box every two years.
Calibration Procedure IDAX-300
It is recommended to calibrate the IDAX-300 at least once a year. There are two options
regarding calibration of IDAX-300:
The IDAX unit can be sent to Pax for calibration
§
Calibration can be performed by the customer using the optional Calibration Set
§
2
The second option means that the IDAX instrument is available since it does not need to be sent
away for calibration. The calibration procedure is easy to perform using the optional
Calibration Set, which consists of:
Calibration Box
§
Calibration Software
§
Cables and connectors
§
User's Manual
§
The only thing that needs to be sent away is the Calibration Box and calibration of the
Calibration Box can be performed by any local accredited laboratory or testing facility handling
test and measure instruments.
Results User Interface
Results program is the window where all data from the measurement are displayed in a
graphical or text format. Earlier performed measurements can also be opened for comparison
purposes. Moreover, a measurement plan for the measurement to be performed can be edited
here.
Interaction with the program is done via windows and toolbar menu, the functions are
described in "Results Menus and Commands"
Results window is divided into two sections:
Test Browser (left-side)
§
Measurement Plan and presentation of the measurement results in graphical and table
press Save. New empty template will appear in Text View mode for editing. See also section
"IDAX 206 Commands and Variables".
2.1.1.1.4 File / New / Measurement Sequence
New Measurement Sequence is created when:
· new measurement is to be performed on new object
· new measurement is to be performed on an existing object
· individual measurement file(s) is imported
Note!
Before creating new Measurement Sequence, at least one measurement template
must be associated with the test object.
1. To create new test sequence:
· select New / Measurement Sequence from File menu
or
· right-click on chosen test object and from menu selecting New Measurement
Sequence (see picture below)
2. New Measurement Sequence will be automatically assigned a name in form of date as shown
below (date has the format according to International Standard ISO 8601). The name for
Measurement Sequence (i.e. "First Test" as in picture below) is optional.
User can add or remove Measurement Templates, (C-files) for selected measurement object
using this command. It invokes a dialog window where user can manipulate with available
Measurement Templates (see picture below).
This dialog window can be also invoked by right mouse click on selected object and choosing
Add/Remove Templates from the menu which appears as shown below.
One or more measurements can be opened by this command depending on selected item in
Test Browser.
Selected itemData to be opened
Single data fileAll sweeps in selected data file
Measurement SequenceAll sweeps in all data files under selected Measurement Sequence
ObjectAll sweeps in all data files in all Measurement Sequences under
selected Object
File / Close Measurement
One or more measurements can be closed by this command depending on selected item in Test
Browser.
Selected itemData to be closed
Single data fileAll sweeps in selected data file
Measurement SequenceAll sweeps in all data files under selected Measurement Sequence
ObjectAll sweeps in all data files in all Measurement Sequences under
selected Object
File / Remake Measurement
In cases when user is dissatisfied with a certain measurement it is possible to repeat this
measurement with the same settings using Remake Measurement as follows:
2.1.1.6
2.1.1.7
1. Connect IDAX to the test object if not connected.
2. Select the measurement file, (D-file) to be repeated (obligatory).
3. Choose Remake Measurement. It will create a Measurement Plan, (C-file) from the selected
data file, i.e. all measurement settings from this data file are copied into the new
Measurement Plan, (C-file).
4. Make corrections in Measurement Plan if needed.
5. Press ON on IDAX front panel to start the measurement.
File / Save
Save any changes made to the current template or Measurement Plan.
File / Save As
1.Select template which is to be saved under new name.
2.Invoke Save As dialog from menu File / Save As...
Note:The Object Templates are saved in Object Templates directory and Measurement
Templates under Measurement Templates directory
2.1.1.8
File / Load D-file
Shortcut keys: Ctrl+L
This command allows for temporary loading of single measurement files, D-files. During
loading a Temporary Object and Temporary Sequence are created as shown in picture below.
All subsequent data files are opened under the same Temporary Sequence.
The opened files can be then imported under an existing object by using File / Import File / ToStructure.
If Results program is opened as an independent program and the data files are temporary
opened, then closing Results program, user is asked if the opened files should be imported into
the existing data structure.
When sharing measurement data between different IDAX instruments or computers, Import
function facilitates the process of insertion of individual measurements into existing data
structure. Data are imported in a fashion which corresponds that they can be appropriately
imported back into the same or other data structure.
Depending on data to be imported type and structure the following options are available:
IDA Zip FileImport archived measurement data
File to StructureImport selected file into existing structure
Measurement TemplatesImport selected Measurement Templates
Object TemplatesImport selected Object Templates
2.1.1.9.1 File / Import / IDA Zip File
Short-cut keys:Ctrl+Alt+I
Import the data in from archived (*.izf) format. Data are inserted among existing
measurements preserving the structure of the archived file.
1. Choose File / Import / IDA Zip File to invoke regular Open dialog.
2. Select file to be imported and press OK.
2.1.1.9.2 File / Import / File to Structure
Command is used to import individual measurement files into existing data structure, i.e. it
requires an Object and a Measurement Sequence. New Object and Measurement Sequence
need to be defined in case there is no object and/or sequence to import the data.
1. From menu File / Import / File to Structure invoke import dialog.
2. Select the directory where measurement(s) to be imported are located.
3. Select Object under which the measurement must be imported.
6. Press OK button and the measurement will appear in the Test Browser.
2.1.1.9.3 File / Import / Measurement Templates
Measurement Templates can be imported from a selected location on the IDAX hard drive or
user's computer. It is done by invoking a dialog window shown below from menu File / Import/ Measurement Templates:
1. Choose directory where template(s) to be imported are located by typing in the path
manually or using Browse button.
2. Select template(s) to be imported from available templates in the left hand side.
3. Press Add button or double click by left mouse button on chosen template.
4. Press OK button.
2.1.1.9.4 File / Import / Object Templates
Object Templates can be imported from a selected location on the IDAX hard drive or user's
computer. It is done by invoking a dialog window shown below from menu File / Import /Object Templates:
1. Choose directory where the template(s) to be imported are located by typing in the path
manually or using Browse button.
2. Select the template(s) to be imported from available templates in the left hand side.
3. Press Add button or double click by left mouse button on chosen template.
When sharing measurement data between different IDAX instruments or computers, Export
function facilitates the process of extraction of individual measurements or templates from
existing data structure. Data are exported in such a fashion that they can be appropriately
imported back into the same or other data structure.
Depending on objective the Export function can be used in differently:
IDA Zip FileExport data structure to a single file
DataExport tab-delimited data or graph into a file
Measurement TemplatesExport selected Measurement Templates
Object TemplatesExport selected Object Templates
2.1.1.10.1 File / Export / IDA Zip File
Short-cut keys:Ctrl+Alt+E
Export of the data in an archived (*.izf) format. By exporting data into an IDA Zip File, the data
structure is preserved. It is possible to export:
· individual measurements - Object and Measurement Sequence information are included.
· Measurement Sequences - Object information and all measurements in this sequence are
included.
· Objects - all Measurement Sequences with respective measurements are included.
2.1.1.10.2 File / Export / Data
Short-cut keys:Ctrl+E
The "Export" command invokes an export-dialog with two different file type options, export to
a file as a graph or the measurement points:
· WMF (Windows metafile)
· TXT (Tab delimited format)
If the measurement data is exported as a TXT-file one can also select appropriate Format and
Decimal separator. The Format option allows user to remove the header of the file, which
makes it easier to import the data into another program. Decimal numbers are written in the
file using chosen Decimal separator option - point or comma.
Moreover, it is possible to export also the measurement file itself by checking checkbox
"Include D-File", which may be favourable when exporting to floppy disk.
Measurement Templates can be exported to a selected location on the IDAX hard drive or user's
computer. It is done by invoking a dialog window shown below from menu File / Export /Measurement Templates:
Results User Interface41
1. Select templates to be exported side from available templates in the left hand.
2. Press Add button or double click by left mouse button.
3. Choose destination directory typing in the path or using Browse button.
4. Press OK button.
To remove a template:
1. Select it from the right hand side from selected templates.
2. Press Remove button or double click by left mouse button.
Object Templates can be exported to a selected location on the IDAX hard drive or user's
computer. It is done by invoking a dialog window shown below from menu File / Export /Object Templates:
1. Select templates to be exported side from available templates in the left hand.
2. Press Add button or double click by left mouse button.
3. Choose destination directory typing in the path or using Browse button.
4. Press OK button.
2.1.1.11
To remove a template:
1. Select it from the right hand side from selected templates.
2. Press Remove button or double click by left mouse button.
File / Print
Shortcut keys: Ctrl+P
The Print command allows user to print out a simple report of the measurement results in a
text format.
Graph, Table or 50/60 Hz Data view
Pressing Print first invokes a special window for Print Setup, where user can compose the
appearance of the report. By checking in given options one can print out a report consisting of:
· calculated values such as equivalent current, dissipated power, power factor and
capacitance at 10 kV and at 50/60 Hz,
· table containing the data, which are selected in the Results window,
When in Measurement Plan view and in Text View mode user can print test plan text. If not
in Text View mode, the Print command is inactive.
2.1.1.12
File / Report
Shortcut keys: Ctrl+Alt+P
This command invokes a dialog window where two report generators are available.
Report GeneratorDescription
List&LabelCreate report using special set of drivers (only option available
MS WordCreate Report using features Microsoft Word text editor
2.1.1.12.1 List&Label Report
List&Label is a set of special drivers provided for designing, viewing and printing reports.
When invoking List&Label report generator, a dialog window allows for choosing between
various options as shown in the picture below. If there are already prepared report file(s) they
will be listed in the left side of the dialog window and can be selected to work with.
when creating report on IDAX)
(Requires MS Word application installed on computer)
Create new report file. See also separate manual for
List&Label.
Add report
Add a report to the list of available reports
Delete
Delete the selected report file
Modify
Modify in selected report file can be done. It means that
the layout, appearance, etc. can be changed. (See separate
manual for List&Label).
Preview
Preview selected report file with the users data
Print
Print the report according to previously designed layout
from selected report file, for example, Two winding
transformer + bushings.lst
Close
Close Report dialog
Menu functions
Description
New report file
Create new report file using MS Word
Add report
Add a report to the list of available reports
Delete
Delete the selected report file
Modify
Modify in selected report file can be done. It means that
the layout, appearance, etc. can be changed.
Compile
Preview selected report file with the users data. Printing is
done using MS Word print options.
Close
Close Report dialog
2.1.1.12.2 MS Word Report
MS Word report generator allows for designing, viewing and printing reports using Microsoft
Word features.
When invoking MS Word report generator, a dialog window allows for choosing between
various options as shown in the picture below. If there are already prepared report file(s) they
will be listed in the left side of the dialog window and can be selected to work with.
In addition to different data export options, the measurement data file, (D-file) can be sent to
other programs directly for further analysis. For this purpose Results are configured by
providing search path to the external program. The configuration is made from menu
Configuration / Program... where the appropriate executable file is selected in dialog box.
Now the data file loaded into Results can be sent to the chosen external program from File /Send to... as shown below. If the configuration step has been omitted, the dialog shown above
appears and user is prompted to enter the search path at this stage.
When a executable application is selected, the name of the executable is added to the Sendto... menu as shown below, where MODS has been chosen as application where data are to be
sent.
3. To confirm, select Yes and press Enter or left-click, otherwise select No.
2.1.1.16
2.1.2
File / Exit
Shortcut keys: Alt+F4
1. Closes Results program, without quitting IDAX System Control program. Results can be
restored by pressing F4 or selecting from menu Windows / Results in IDAX System Control
window.
2. If Results were launched as stand-alone application - File / Exit quits Results program without
saving changes.
Results Edit Menu
Commands for handling text and objects
Menu CommandDescription
UndoUndo last operation
CopyCopy object(s) or text to clipboard
Copy AllCopy all selected objects or text to clipboard
CutCut object(s) or text to clipboard
PastePaste object(s) or text from clipboard
Select AllSelect all object(s) or text from Results window
Commands for handling graphical output
Menu CommandDescription
Toggle SweepToggles between show and hide measurement sweep
Mark SweepShows measurement sweep
Unmark SweepHides measurement sweep
Change Sweep ColorChanges colour appearance of measurement sweep
Reverse the effect of the last action performed, such as typing, deleting or formatting text, etc.
Edit / Copy
Shortcut keys:Ctrl+C
Place a duplicate of the selected text or object(s) onto the Clipboard where it can be pasted
elsewhere.
Page 48
IDAX User's Manual48
2.1.2.3
2.1.2.4
2.1.2.5
Edit / Copy All
Shortcut keys:Ctrl+Alt+C
Graph
Copy Results window to Clipboard. i.e. make screen dump as using Alt+Print Screen.
Table
Copy content of the table to Clipboard
50/60 Hz Values
Copy measured values at 50/60 Hz to Clipboard.
Test Plan
Highlight all text in the current text frame (Text View) and place a duplicate of it onto the
Clipboard where it can be pasted elsewhere.
Edit / Cut
Shortcut keys:Ctrl+X
Delete the selected text from Measurement Plan or Template and place it on the Clipboard
where it can be pasted elsewhere.
Edit / Paste
Shortcut keys:Ctrl+V
2.1.2.6
2.1.2.7
2.1.2.8
Place the contents of the clipboard (the last text cut or copied) back into Test Plan.
Edit / Select All
Shortcut keys:Ctrl+A
Highlight all text in the current text frame (Text View) for subsequent copying.
Edit / Toggle Sweep
Toggles between Mark Sweep and Unmark Sweep, i.e. displays or hides the selected
sweep(s) in the graph, table and the values at power frequency. The effect of Toggle Sweep
depends on position in Test Browser.
Position in Test BrowserDisplayed sweeps
ObjectAll opened measurements under this object are displayed/hidden
Measurement SequenceAll opened measurements in this sequence are displayed/hidden
Measurement fileAll sweeps in this file are displayed/hidden
A sweep selectedOnly selected sweep is displayed/hidden
Edit / Mark Sweep
Displays the selected sweep in the graph, table and shows values at power frequency. In order
to have an effect of Mark Sweep:
· the sweeps must be unmarked (hidden)
· the sweeps to be displayed also depends on selected position in Test Browser.
Position in Test BrowserDisplayed sweeps
ObjectAll opened measurements under this object are displayed
Measurement sequenceAll opened measurements in this sequence are displayed
Measurement fileAll sweeps in this file are displayed
Hides the selected sweep in the graph, table and the values at power frequency. In order to
have an effect of Unmark Sweep:
· the sweeps must be marked (displayed)
· the sweeps to be hidden also depends on selected position in Test Browser.
Position in Test BrowserDisplayed sweeps
ObjectAll opened measurements under this object are hidden
Measurement sequenceAll opened measurements in this sequence are hidden
Measurement fileAll sweeps in this file are hidden
A sweep selectedOnly selected sweep is hidden
Edit / Change Sweep Color
Changes colour appearance of selected sweep. Change Sweep Color invokes a colour dialog
window from which a desired colour for sweep can be selected. This command can also be
invoked right-click on selected sweep.
Edit / Read Only
Allows for changes in those fields which are read only by default:
· object data when measurement sequence is selected
· Measurement plan for data files (D-files)
2.1.3
2.1.3.1
By selecting Edit / Read Only this feature is removed and user can change the content of all
fields.
Results Diagram Menu
Menu commandDescription
Zoom inZooming in into a selected area
Zoom outReturning to full graph
Diagram / Zoom In
Shortcut keys: Ctrl+I
1. The Zoom In command allows user to select a rectangular area of the by dragging a
Zoom out command fully displays all active curves similarly as turning on Autoscale in axis
settings. The axis settings in the axis settings, however, remain unchanged.
Results View Menu
Menu CommandDescription
BrowserShow/Hide Test Browser.
Browse Object TreeAllow to select which items are displayed Test Browser.
Browse Measurement TemplatesShow only Measurement Templates
Browse Object TemplatesShow only Object Templates
InformationDisplay information about Object, Measurement Sequence,
Measurement Plan etc.
GraphShow graphical representation of measurements
TableShow table view of the measurement results
50/60 Hz DataPresent the values at power frequency
Text ViewOpen Measurement Plan or Template programming
commands for its interface and measurement settings for
review and editing
2.1.4.1
2.1.4.2
2.1.4.3
2.1.4.4
2.1.4.5
Show Measurement TemplatesShow/Hide Measurement Templates
View / Browser
Toggles between hide and show Test Browser. It may be convenient to hide it in order to
maximise the area for graphical output as well as for table and when editing measurement
plans.
View / Browse Object Tree
Displays all objects inclusive associated Measurement Templates, Measurement Sequences,
Measurement Plans, (C-files) and measurement data files, (D-files).
View / Browse Measurement Templates
Displays all available Measurement Templates and it is possible to edit any of them as well as
create new ones.
View / Browse ObjectTemplates
Displays all available Object Templates and it is possible to edit any of them as well as create
new ones.
View / Information
Measurements performed by IDAX are described in a command file, called Measurement Plan or
C-file (*.icf). This text file contains all information specific for the measurement in question, and is in
its entirety saved in the data file (*.idf) before the measurement data.
Displayed content of Information tab depends on selected place in Test Browser. There are
several possibilities:
Displays information about object corresponding to the chosen Object Template. Object
information can be edited using also Text view mode. The changes made here will, however,
be unique for the given object. Permanent changes must be made in Object Template(s).
Information - Measurement Sequence
Measurement Sequence displays information relevant to given measurement occasion.
Measurement Sequence can be edited using also Text view mode. The changes made here will,
however, be unique for the given Measurement Sequence only. Permanent changes must be
made in Object Template(s).
Information - Measurement Template
1. Selected Measurement Template is associated with an object
Displays the appearance of Measurement Plan for specific conditions (see also Measurement
Templates) and given object. Measurement Template(s) can be edited using also Text view
mode. The changes made here will, however, be unique for the given object only. Permanent
changes must be made in Measurement Template(s).
2. When using View / Browse Measurement Templates
Similar as above, but the changes made in Text view mode will be permanent and will have
effect when creating next new object or adding given Measurement Template to existing
object(s).
Information - Measurement Plan
Measurement Plan displays the same information as Measurement Template and can be edited
also using Text view mode. In the Text view mode appearance of the Measurement Plan view
can be specified, thus hiding irrelevant information from the user. The changes made here will,
however, be unique for the given measurement. Permanent changes must be made in
Measurement Template(s).
Measurement Data displays the same information as Measurement Plan. The data itself is not
visible, yet can be viewed in Text mode.
Caution: The data files are Read-only and even the editing is possible after disabling Read-only
attribute, it is strongly discouraged. Any data loss or damage caused by editing of data files is
user's responsibility.
The IDAX System Control reads the Measurement Plan and each line is interpreted in
subsequent order. Normally, every variable or command is contained in a separate row.
However, multiple variables and commands can be entered in the same row if they are
separated with semicolons. When the measurement is started, current Measurement Plan is
copied to a file LastC.icf in D:\IDA catalogue, which is then read and executed by the IDAX
System Control.
2.1.4.6
View / Graph
Shortcut keys:Ctrl+G
Displays graphical output of an ongoing measurement and/or previously made and opened
measurements. It is possible to display graphical representation of the measurements using
different parameters, i.e. loss tangent, power factor, PF, capacitance, C and others (see also
Configuration / Models).
By clicking right mouse button on a measurement point the properties of this point are shown
in Properties box in left lower corner of Results window.
Ongoing measurement and/or previously made and opened measurements are displayed in a
text mode. In addition to measured values loss tangent, power factor, PF, capacitance, C and
others, in Table mode also hum current, DC offset and object's capacitance are shown for
specified configurations.
2.1.4.8
View / 50/60 Hz Data
Measured values
When a frequency sweep is performed, the measurements are done at certain pre-defined
frequencies. Due to possible interferences at power frequency (50 or 60 Hz) it is generally
recommended to avoid this frequency. Instead, two measurements near the power frequency
are performed and the values at power frequency are obtained by interpolation.
10 kV equivalents
The 10 kV equivalents are values that are calculated from the measured values. Using low
voltage, e.g. 200 Vpeak, will result in a certain current through the sample. A linear insulating
material, such as oil and/or paper, will have the same dissipation factor and capacitance also at
a 10 kV test voltage. Therefore, it is possible to calculate the current and power at 10 kV from
the measured values.
2.1.4.9
2.1.4.10
2.1.5
View / Text View
Displays text behind the Measurement Plan or Template. In Text View all formatting and
measurement settings are shown for user and editing is enabled. It is also possible to view data
files (D-files), but their editing is disabled.
View / Show Measurement Templates
Shows or hides Measurement Templates associated to objects in Test Browser. Hiding templates
saves space in Test Browser, which may be recommended.
Results Configuration Menu
There are commands under this menu which allow user to configure output of measurement
results, display desired measured values in both graphical and text format as well as edit
measurement plan(s).
Menu commandDescription
InformationConfigure appearance and Template and Measurement Plan
editing tools
GraphConfigure appearance of graphical output
TableConfigure Table view
Power Frequency DataDisplay values of losses and capacitance at power (network)
frequency (50 or 60 Hz)
2.1.5.1
Send toSelect an external program for data analysis
ModelsDisplay available models for presentation of results
Configuration / Information
Editing of Measurement and Object Templates and Measurement Plans in Text View mode can
be facilitated by means of this dialog window.
Display TitleToggle ON/OFF display title
AxisConfigure Axis settings
BackgroundChange background color
2.1.5.2.1 Configuration / Graph / Display Title
Toggles ON/OFF the graph title.
2.1.5.2.2 Configuration / Graph / Axis
The Axis command invokes the axis dialog window. This window allows the names, scales, grid,
prefixes, etc. on the axes to be modified. The dialog is divided into three parts:
Title
§
X-axis
§
Y-axis.
§
2.1.5.2.2.1 Autoscale
Autoscale automatically sets the scale so that all active curves are displayed in the graph.
Note!
Negative values are not possible to display in logarithmic scale.
2.1.5.2.2.2 Grid
For grid settings, three options are available:
None, no grid is shown.
§
Small, also called tics. Only an indication at the axis, no lines in the graph.
Allows user to enter a label text for both X- and Y- axis.
2.1.5.2.2.4 Log/Lin
Results User Interface59
Makes it possible to change between logarithmic and linear scale for the X and/or Y axis.
Note!
Negative values are not possible to display in logarithmic scale.
2.1.5.2.2.5 Precision
Precision sets how many digits of the point is presented in the Graph/Table.
2.1.5.2.2.6 Prefix/Scientific
Changes between Prefix or Scientific notation in the Graph/Table.
2.1.5.2.2.7 Title
Here the title for the graph in Results can be written. If Auto is checked, the title of the
measurement will be displayed for the measurement. If more than one measurements are
loaded in the results window, with different titles, no title will be displayed.
Units for both X- and Y- axis.
2.1.5.2.3 Configuration / Graph / Background
Shortcut keys: Ctrl+B
Using this command the background of the graph can be changed. The selected color is used on
display and in files exported in *.wmf format, however, when printing the background color is
set to white.
2.1.5.3
Configuration / Table
Allows user to choose between displaying or hiding the disturbance data when in Table mode.
2.1.5.4
Configuration / Power Data
Configures display of desired values at power frequency (50 or 60 Hz). This command invokes a
dialog window shown below. The options are as follows:
1) showing either loss tangent (tand) or Power Factor (PF)
2) select power frequency
50 Hz, e.g. Europe, Australia, most part of Africa and Asia
§
60 Hz, e.g. USA, Canada, Mexico, certain countries in South America
§
3) showing interpolated 10 kV equivalents for current, dissipated power, Power Factor and
The dialog window, which appears when selecting this menu command, allow user to choose
an external application for further data analysis. This is done by providing the search path to
this program as shown below.
Configuration / Models...
Shortcut keys:Ctrl+M
Command Configuration / Models... invokes a window where available models for
presentation of measurement results are shown. Different models can be selected and the
corresponding results in graphical or text format will be simultaneously displayed.
Selected models appear at the bottom of Results window, where one can choose which
parameters are to be shown. Below the Dielectric and C, PF, Tan-Delta models are chosen to be
used in Results and e¢ as a parameter is displayed in the graph.
Impedance models
The following impedance models and their parameters are available:
Results HelpDisplay help for Results only
What's this?Pop-up help for unclear fields or menu
Help / Contents
IDAX Help contents displays available Help topic:
TopicDescription
IDAXOverview of IDAX operating principle and functions
Results User InterfacePreparation of measurements and presentation of results
Command and Variable ReferenceReference of programming directives
IDAX Error MessagesError messages generated by IDAX and possible
countermeasures
Test Browser
Test Browser is located at the left hand side of the Results window and it works similarly to
Microsoft Windows Explorer. The main purpose of the Test Browser is to facilitate:
navigation between already performed measurements, Object and Measurement
§
Templates
organisation of new measurements on the existing or new objects
§
creation and editing Measurement and Object Templates
Test Browser is arranged as a tree-like structure consisting of:
Objects
§
Measurement Sequences
§
Measurement Plans and data files
§
Objects
Each object is represented by an object template specified in a file Object.obj. This file contains
the information about the object which is constant such as owner, manufacturer, serial number,
etc. There are several pre-defined Object Templates for power transformers, bushings and
cables. Depending on user's needs these files can also be modified as well as new templates can
be created.
When creating new objects it is recommended to select Measurement Templates which can be
associated to those objects.
Measurement Sequence
Measurement Sequence is created in order to make a measurement and therefore at least one
Measurement Template must be associated with the Object.
Measurement structure
In order to perform a measurement a Measurement Sequence must be available or a new one
must be created. New sequence is created by selecting desired object and press File / New /Measurement Sequence. This will result in:
· A dialog will appear where a test date and an optional name of Measurement Sequence
can be defined
· All Measurement Templates associated with the object will be copied to the folder of new
Measurement Sequence (inclusive the object information) as command or C-files (*.icf).
· In order to run a measurement, a command file from those under Measurement Sequence
is chosen and IDAX is started by pressing ON.
· When measurement is started, the command file is replaced by a data file containing both
information from the command file and measurement data. Finished measurement can be
repeated by selecting data file and choosing File / Remake Measurement. This will create
a new command file copy from data file, which is possible to start again. (The name of
command file will remain the same as original data file with additional number at the end,
for example xxxxx-2 or yyyy-3, where number indicates times the measurement has been
repeated.
· When measurement is finished the next command file in given Measurement Sequence can
be selected and run until the entire Measurement Sequence is done. Unwanted command
files can be deleted or simply left as they are.
2.2.2
Measurement Templates
Measurement Templates are templates which are recommended to use when performing
various measurements on power and distribution transformers, bushings and cables. The form
view of Measurement Template is pre-specified, however, can be modified to satisfy different
requirements. For information about the commands in the IDAX C file see the Commands and
Variable Reference in the program help file or included pdf manual.
In all Measurement Templates it is provided that user can choose to perform either:
1) frequency sweep down to a specified stop frequency, or
2) measurement only at power frequency (50 or 60 Hz). This last option is not available for XLPE
cable measurements and in limited extent in general measurement plans.
Two winding transformer
Available Measurement Templates are:
2W-CH - measurement of insulation between high voltage winding and ground
§
2W-CHL - measurement of insulation between high and low voltage windings
§
2W-CL - measurement of insulation between low voltage winding and ground
§
Three winding transformer
Available Measurement Templates are:
3W-CH - measurement of insulation between high voltage winding and ground
§
3W-CHL - measurement of insulation between high and low voltage windings
§
3W-CHT - measurement of insulation between high voltage and tertiary winding
§
3W-CLT - measurement of insulation between low voltage and tertiary winding
§
3W-CL - measurement of insulation between low voltage winding and ground
§
3W-CT - measurement of insulation between tertiary winding and ground
§
Autotransformer without tertiary winding
Available Measurement Templates are:
§
Autotransformer with tertiary winding
Available Measurement Templates are:
§
§
§
Bushings
Available Measurement Templates are (for each phase):
2WA-CH - measurement of insulation between high/low voltage winding and ground
3WA-CH - measurement of insulation between high/low voltage winding and ground
3WA-CHT - measurement of insulation between high/low voltage and tertiary windings
3WA-CT - measurement of insulation between tertiary winding and ground
C1, H1 - measurement of bushing H1* main insulation, C1
C1, H2 - measurement of bushing H2 main insulation, C1
C1, H3 - measurement of bushing H3 main insulation, C1
C2, H1 - measurement of bushing H1 insulation between test tap and ground sleeve, C2
C2, H2 - measurement of bushing H2 insulation between test tap and ground sleeve, C2
C2, H3 - measurement of bushing H3 insulation between test tap and ground sleeve, C2
Page 66
IDAX User's Manual66
No
Message
Explanation
101
Filename missing
File name not specified file dialog. Specify a file
name.
103
Not string
A string variable is expected.
104
Could not open file:
Wrong file name, file is missing or path is incorrect.
105
Could not open or create
key
Problem accessing Windows Registry.
* H1, H2 and H3 are default labels for bushings of different phases.
PILC Cables
PILC Cable, A - measurement of insulation of phase A*
§
PILC Cable, B - measurement of insulation of phase B
§
PILC Cable, C - measurement of insulation of phase C
§
* A, B and C are default labels for different phases of the cable.
XLPE Cables
XLPE Cable, A - measurement of insulation of phase A*
§
XLPE Cable, B - measurement of insulation of phase B
§
XLPE Cable, C - measurement of insulation of phase C
§
* A, B and C are default labels for different phases of the cable.
General measurements
Available Measurement Templates are:
General (PF Data) - generic measurement plan for measuring only at power frequency (50/60
§
Hz)
General (Sweep) - generic measurement plan for measuring of frequency sweep
§
General HV - generic measurement plan for measurements using IDA High Voltage Unit
§
2.2.3
3
Object Templates
Object Templates are templates which are recommended to use when creating new objects.
Available pre-specified templates are:
!!Test Capacitor
§
!General Specimen
§
Autotransformer with Tertiary + Bushings
§
Autotransformer with Tertiary
§
Autotransformer without Tertiary + Bushings
§
Autotransformer with Tertiary
§
Bushings
§
PILC (Paper Insulated Lead Covered) Cable
§
Three Winding Transformer + Bushings
§
Three Winding Transformer
§
Two Winding Transformer + Bushings
§
Two Winding Transformer
§
XLPE Cable
§
The form view of Object Template is pre-specified, however, it can be modified to satisfy
different requirements. For information about the commands in the IDAX C file see the
Commands and Variable Reference in the program help file or included pdf manual.
(347) Output voltage is not within specified limits
Measured output voltage is outside specified limits.
Possible reasons and countermeasures
1) Voltage electrode, Hi, is grounded:
check measurement set-up and disconnect ground
§
change measurement configuration if terminal of test object cannot be disconnected from
§
ground
2) Voltage electrode, Hi, is connected to measuring electrode, Lo or Ground:
check measurement set-up and disconnect measuring or guard electrodes from the voltage
§
electrode. Voltage electrode, Hi, must not be connected to either measuring or guard
electrode
3) High stray capacitances to ground or high capacitance of the test object:
lower the highest frequency used in C-file (see also Measurement variables)
§
Lower the InitFrequency in the C-file (see also Measurement variables)
§
(361) Overvoltage
Measurement aborted due to overvoltage detected on measuring electrode, Lo. Potential
difference between signal ground and real ground exceeds limiting value.
3.3
3.4
Possible reasons and countermeasures
1) Ground electrode is not connected to true ground:
connect Ground electrode to true station/substation ground
§
2) Transients caused by accidentally disconnected ground connection:
check ground connection
§
(364) Measured capacitances don't match
Values of capacitance measured for different configurations, the UST, GST-Guard and
GST-Ground are in disagreement.
Possible reasons and countermeasures:
1) When performing UST measurement, measuring electrode, Lo, is connected together with
Ground electrode or Lo is connected to ground:
check measurement set-up and make sure that measuring electrode, Lo, is connected to a
§
non-grounded terminal of the test object and that Ground electrode is connected to ground
(365) Specimen capacitance below limit
Measured capacitance below limit specified in C-file by MinSpecimenC.