Chauvin Arnoux C.A 6549 User manual

1
■■
■■
■MÉGOHMMÈTRES
■■
■■
■MEGOHMMETERS
C.A 6549
FRANCAIS
E N G L I S H
Mode d'Emploi
User's manual

48
Meaning of symbol
!
CAUTION ! Refer to the user manual before using the instrument.
Failure to follow or carry out the instructions in this User Manual preceded by this symbol
may result in personal injury or damage to the instrument and the installations.
Meaning of symbol
This instrument is protected by double or reinforced insulation. It does not need to be
grounded for electrical safety.
Meaning of symbol
CAUTION ! Risk of electric shock.
The voltages of the parts identified by this symbol may be ≥120VDC. For safety reasons,
this symbol lights on the display unit as soon as a voltage is generated.
Thank you for purchasing this C.A 6549 megohmmeter and for your confidence.
For the best possible service from your instrument:
- read this User Manual carefully,
- comply with the precautions for use.
!
PRECAUTIONS FOR USE
!
■Comply with the conditions of use : temperature, humidity, altitude, degree of pollution and place of
use.
■This instrument may be used directly on installations of which the operating voltage does not exceed
1000V with respect to ground (measurement category III), or on circuits by-passing the network and
protected, or on circuits not by-passing the network (measurement category I).In the latter case, the
operating voltage must not exceed 2500V, with impulse voltages limited to 2.5kV (cf.NF EN 61010
ed.2 of 2001).
■Use only the accessories delivered with the instrument, compliant with safety standards (NF EN
61010-2-031).
■Use a fuse having the appropriate rating and type (see § 8.1.2); failure to do so may damage the
instrument and void the warranty.
■Set the switch to OFF when the instrument is not in use.
■Check that none of the terminals is connected and that the switch is set to OFF before opening the
instrument.
■Repairs and metrological verifications must be carried out by approved, qualified personnel.

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CONTENTS
1. PRESENTATION ............................................................................................................................ 50
1.1. The megohmmeter ............................................................................................................... 50
1.2. Accessories ......................................................................................................................... 50
2. DESCRIPTION ............................................................................................................................... 51
2.1. Housing / Front panel / Keys ................................................................................................ 51
2.2. Display ................................................................................................................................. 53
3. MEASUREMENT FUNCTION ........................................................................................................ 54
3.1. AC / DC voltage ................................................................................................................... 54
3.2. Insulation measurement ....................................................................................................... 54
3.3. Capacitance measurement .................................................................................................. 56
3.4. Residual current measurement ............................................................................................ 56
4. SPECIAL FUNCTIONS .................................................................................................................. 56
4.1. MODE/PRINT key ................................................................................................................ 56
4.2. DISPLAY/GRAPH key ......................................................................................................... 60
4.3. 3/ T° key ............................................................................................................................ 68
4.4. 6/ SMOOTH key ................................................................................................................ 69
4.5. SET-UP function (instrument configuration) ......................................................................... 69
4.6. List of coded errors .............................................................................................................. 75
5. PROCEDURE ................................................................................................................................ 75
5.1. Course of measurements ..................................................................................................... 75
5.2. Measurement in Voltage Step mode ..................................................................................... 77
6. MEMORY / RS 232 ......................................................................................................................... 78
6.1 RS 232 characteristics ......................................................................................................... 78
6.2 Recableing / plyback of memory (MEM/MR) ........................................................................ 79
6.2 Printing measured values (PRINT key) ................................................................................ 80
7. SPECIFICATIONS .......................................................................................................................... 85
7.1 Reference conditions ........................................................................................................... 85
7.2 Characteristics per function ................................................................................................. 86
7.3 Power supply ....................................................................................................................... 89
7.4 Environmental conditions ..................................................................................................... 90
7.5 Construction specifications .................................................................................................. 90
7.6 Compliance with international standards .............................................................................. 90
7.7 Variations with in domain of use ........................................................................................... 91
8. MAINTENANCE ............................................................................................................................. 91
8.1 Servicing .............................................................................................................................. 91
8.2 Metrological verification........................................................................................................ 92
9. GUARANTEE ................................................................................................................................. 92
10.TO ORDER .................................................................................................................................... 92

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1. PRESENTATION
1.1. C.A 6549 MEGOHMMETER
The C.A 6549 megohmmeter is a top-of-line measuring instrument, portable, in a rugged construction-
site housing with cover, with a graphic screen, operating from battery or line power.
Its main functions are:
§automatic detection and measurement of voltage / frequency / input current,
§quantitativeandqualitative insulation measurement:
- measurement at 500/ 1000/ 2500/ 5000V DC or other test voltage between 40 and 5100 V DC
(“adjustablevoltage”),
- measurement in voltage step mode (the applied voltage increases in steps),
- automatic calculation of DAR/PI and DD (dielectric discharge index) quality ratios,
- automatic calculation of measurement result referred to a reference temperature.
§automaticcapacitancemeasurement,
§automatic measurement of residual current.
This megohmmeter helps ensure the safety of electrical installations and equipment.
Its operation is controlled by microprocessor for the acquisition, processing, and display of measurements
and the storage and printing of results.
It has many advantages, among them:
- digital filtering of insulation measurements,
- automaticvoltagemeasurement,
- automatic detection of external AC or DC voltages on the terminals, before or during insulation
measurements, disabling or stopping the measurements when measurement accuracy is no longer
guaranteed,
- threshold programming to trigger audible alarms,
- timer for measurement time checks,
- protection of the instrument by fuse, with detection of defective fuses,
- operator safety by automatic discharge of residual high voltage on the equipment tested,
- automatic shutdown of the instrument to save battery power
- battery charge indication,
- large backlit graphic display unit that is very easy for the user to read,
- Memory (128 KB), real time clock, and serial interface
- PC control of the instrument (using the optional DataViewer Pro software)
- Printing in RS 232 or Centronics mode.
1.2. ACCESSORIES
§Measuring cables
The megohmmeter is delivered with 3 measuring cables as standard:
- 2 3m safety cables (red & black with rear pick up), with an HV plug for connection to the instrument and
an HV alligator clip for connection to the item tested
- 2 blue cables (3m and 0.3m with rear pick up) to measure high insulation values (cf. § 5.1).
Optionally, you can order the same cables in lengths of 8m and 15m, and also simplified cables (the
crocodile clip is replaced by a 4mm banana jack in which standard crocodile clips or contact pins can be
connected).

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§DataViewer Pro PC software
This is used to:
- recover stored data (results, graphs, etc.)
- print personalized test protocols in accordance with user needs,
- create text files to be able to use spreadsheets (ExcelTM, etc.),
- configure and completely control the instrument via the RS 232 port.
The minimum recommended configuration is a PC with a 486DX100 processor.
§Serial printer (optional)
This compact printer can be used to print measurement results, whether stored or not, directly in the field.
§Serial-parallel adapter (optional)
The optional RS232/Centronics adapter converts the serial interface (RS232) into a parallel printer interface
(Centronics), making it possible to print all measurements directly on A4-format office printers, without
using a personal computer.
2. DESCRIPTION
2.1. HOUSING
View of the front panel of the instrument
2.1.1. FRONT PANEL OFTHE C;A 6549

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- 3 4mm-dia. safety terminals identified as «+», «G», and «-»
- Access to the fuse that protects terminal “G”
- 8-way rotary switch:
§Off: switches instrument power off
§500 V-2 TΩ: insulation measurement at 500V up to 2 TΩ
§1000 V-4 TΩ: insulation measurement at 1000V up to 4 TΩ
§2500 V-10 TΩ: insulation measurement at 2500V up to 10 TΩ
§5000 V-10 TΩ: insulation measurement at 5000V up to 10 TΩ
§Adjust.50...5000V:insulationmeasurement with adjustabletest voltage (from 40Vto5100V:10V
steps from 40 to 1000V and 100V steps from 1000 to 5100V)
§Adjust. Step: insulation measurement with voltage step function (the test voltage varies in steps)
§SET-UP: adjustment of instrument configuration
- 1 yellow START / STOP key: beginning / end of measurement
- 8 elastomer keys each having a main function and a secondary function.
- 1 backlit graphic screen
- 1 socket for connection to line power (direct operation on line power and/or battery charging)
- 1 RS 232 serial INTERFACE male connector (9 pins) for connection to a PC or printer.
Note: The battery compartment is inside the housing.
2.1.2. KEYS
8 keys each having a main function and a secondary function :
2nd select the secondary function written in yellow italics below each key.
MODE Primary function :before insulation measurements, select the desired type of measurement.
PRINT Secondary function : immediate printing of measurement result(s) on a serial or parallel
printer.
DISPLAY Primary function : browse throught the various screens accessible before, during and
after the measurement.
GRAPH Secondary function : after a "timed run" measurement, display insulation resistance versus
measurement time.
4Primary function : select a parameter to be modified, to the right. At the end of the line, the
cursor jumps to the beginning of the line (all the way to the left).
Secondary function : activate / deactivate display backlighting.
3Primary function : select a parameter tobe modified, to the left
T° Secondary function :activate the calculation to refer the measurement value to the reference
temperature programmed in SET-UP.
5Primary function : in the various menus, select a function; otherwise, generally, increment
the flashing parameter on which the cursor is positioned. Pressing and holding the key
increases the rate of change of the parameter.
ALARM Secondary function : activate / deactivate the alarms programmed in the SET-UP menu.
6Primary function : in the various menus, select a function; otherwise, generally, decrement
the flashing parameter on which the cursor is positioned. Pressing and holding the key
increases the rate of change of the parameter.
SMOOTH Secondary function : enable / disable display smoothing in insulation measurement.

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MEM Fonction première : store measured values.
MR Fonction seconde : retrieve stored data (this function is dependent of the switch position),
except in the OFF and SET-UP positions.
2.2. DISPLAY
2.2.1 GRAPHIC DISPLAY UNIT
Thedisplay unitisa graphicdisplayunit witha resolution of320 x 240pixels. It hasbuilt-in backlighting that
can be activated or deactivated using the ✻ key.
The various screens that are accessible are presented and explained throughout this manual.
We explain below, however, the various symbols that may appear on the screen.
2.2.2 SYMBOLS
REMOTE Indicates that the instrument is controlled remotely via the interface.
In this mode, all of the keys and the rotary switch are inactive, except for shutdown of
the instrument (OFF position).
COM Flashes when data are transmitted to the serial interface.
Lit steadily if there is a problem in transmission.
2nd Indicates that the secondary function of a key will be used.
¿Indicates that the "programmed time test" mode was selected before the measurement
was started.
DAR Indicates that the "automatic calculation of Dielectric Absorption Ratio" mode was
selected before the measurement was started.
PI Indicates that the "automatic calculation of Polarization Index" mode was selected before
the measurement was started
DD Indicates that the "automatic calculation of Dielectric Discharge Index" mode was
selected before the measurement was started.
SMOOTH Smoothing of insulation measurement display.
ALARM Indicates that the alarm is activated. An audible alarm will be emitted if the value
measured is above the limit value defined in the SET-UP menu.
Indicates the battery charge condition (cf.§ 8.1.1.)
Voltage generated dangerous, U > 120VDC.
External voltage present, symbol activated following press on START key, if U > 25VRMS

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3. MEASUREMENT FUNCTIONS
3.1. AC / DC VOLTAGE
Turning the switch to an insulation position (position other than OFF or SET-UP) sets the instrument to
automatic AC / DC voltage measurement.
The voltage between the input terminals is measured at all times and indicated on the display unit:Input
Voltage.
Also, as soon as the switch is turned, the frequency and the residual DC current between the terminals of
the instrument are measured. The residual current is measured in order to evaluate its impact on the
insulation measurement to come.
The insulation measurements cannot be started if there is an excessively high external voltage on the
terminals.
Also, if an excessively high spurious voltage is detected during the measurement, the measurement is
automatically stopped : the symbol is displayed next to the measured external voltage (see § 3.2).
Switching between the AC and DC modes is automatics; in AC, RMS values are measured.
3.2. INSULATION MEASUREMENT
§When the switch is turned to an insulation position, one of the following displays appears :

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Case 1
You select an insulation measurement with a fixed /
standard test voltage, in manual mode.
Positions :
500V - 2TΩΩ
ΩΩ
Ω
1000V - 4TΩΩ
ΩΩ
Ω
2500V - 10TΩΩ
ΩΩ
Ω
5000V - 10TΩΩ
ΩΩ
Ω
Case 2
You select an insulation measurement with a test
voltage other than those proposed as standard.
Position :
Adjust.50V...5000V
You can choose from the 3 "adjusted" voltages
predefined in SET-UP using the 5and 6keys, or
define another voltage by selecting it with the 4
key and adjusting it with the 5and 6keys.
Case 3
You select an insulation measurement with a test
voltage that varies in steps :this is the "step function"
mode.
Position :
Adjust. Step
You can choose among the three step functions
(5and 6keys) you defined earlier in SET-UP.
§Pressing the START/STOP key immediately triggers the measurement.
An audible beep is emitted every 10 seconds to indicate that a measurement is in progress.
A number of special functions can be used during the measurement (cf. § 4.).
Importantremark:
These insulation measurements cannot be started if there is an excessively high external voltage on the
terminals.
§If, when the START key is pressed, the external voltage on the terminals of the instrument is
greater than the value U peak defined below, the insulation measurement is not triggered and an
audible alarm is emitted; the instrument then returns to automatic voltage measurement.

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U peak ≥dlSt x Un
where - Upeak : external voltage, peak or DC, on the terminals of the instrument.
- dlSt : coefficient that can be adjusted in SET-UP - 3% (defaut value), 10% or 20%.
- Un : test voltage selected for the insulation measurement.
§Similarly, if during the insulation measurements, an external voltage greater than the value U peak
defined below is detected, the measurement is stopped and the symbol appears next to the value of
the external voltage measured.
U peak ≥(dlSt + 1,05) x Un,
where - Upeak : external voltage, peak or DC, on the terminals of the instrument.
- dlSt : coefficient that can be adjusted in SET-UP - 3% (defaut value), 10% or 20%.
- Un : test voltage selected for the insulation measurement.
Note :
The dISt factor is adjusted to optimize the measurement build-up time.
If there is no spurious voltage, dISt can be adjusted to its minimum value to obtain the shortest possible
measurement build-up time.
If there is a large spurious voltage, dISt can be increased so that the measurement will not be interrupted
as soon as a negative alternation occurs during the generation of the test voltage;this amounts to optimizing
the measurement build-up time in the presence of a spurious voltage.
§Pressing the START/STOP key again stops the measurement
Ifthe “programmedtime test” mode(TimedRunorTimed Run +DD)was selected as measurement mode,
the measurement is stopped (without action on the START/STOP button) at the end of this time.
Similarly, if the DAR and PI modes are selected as measurement modes, the measurement is stopped
only after the time needed to calculate them (time defined in SET-UP).
A number of special functions can be used during the measurement (cf. § 4.).
3.3. CAPACITANCE MEASUREMENT
The capacitance measurement is performed automatically during the insulation measurement, and is
displayed after the measurement stops and the circuit has been discharged.
3.4. RESIDUAL CURRENT MEASUREMENT
The residual current circulating in the installation is measured automatically upon connection to the
installation, then during and after the insulation measurement.
4. SPECIAL FUNCTIONS
4.1. MODE / PRINT KEY
■The primary function of the MODE key is very important : it is used before the
measurement to define the course of the measurement.
This key is inactive in the "Adjust. Step" and SET-UP positions.
Pressing the MODE key gives access to the list of possible measurement modes. Select the mode
using the 5,6,4and 3arrows.

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To validate the mode selected, press the MODE key again.
The various measurement modes are as follows :
§MANUAL STOP :
This is the conventional quantitative insulation
measurement mode :
The measurement is started by pressing START /
STOP and stopped by pressing START / STOP
again.
The user determines the duration, which is indicated
by the measurement duration chronometer.
§MANUAL STOP + DD :
The measurement is started by pressing START/
STOPandstoppedbypressingSTART/STOPagain.
1 minute after the end of the measurement, the
instrument calculates and display the DD term.The
time remaining during this minute is displayed.
§TIMED RUN
(TIMED RUN TEST)
This mode is used to perform a measurement for a
duration defined in advance, with a predetermined
number of measurement samples : the
measurement is started by pressing START / STOP
and stops automatically after the time programmed
by the user.
This duration (Duration) and the time interval
between samples (Sample) must be specified when
the Timed Run mode is selected.
When the measurement is started, the chronometer counts down the time remaining. When this time
(Remaining Time) is zero, the measurement is stopped.
During the execution of a timed run test, the intermediate samples are automatically stored:they are used
to plot insulation resistance vs. time. This curve can be displayed after the measurement by pressing
GRAPH, as long as no new measurement has been started.
The samples and the curve are automatically stored with the final value of the resistance, if it is stored.
During the measurement, if the position of the rotary switch is changed, or the STOP key is pressed,
the measurement is stopped.

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§TIMED RUN +DD :
This mode is identical to the foregoing except that 1
minute after the end of the measurement the instru-
ment calculates and displays the DD term.
The measurement duration is therefore : duration of
timed run + 1 minute.
The insulation resistance vs. time curve can be
displayed after the mesurement by pressing
GRAPH, as long as no new measurement has been
started.
§DAR :
The measurement is started by pressing START /
STOP and stops automatically when the DAR ratio
has been calculated, i.e. after 1 minute, the time
taken to recable the second insulation rasistance
value needed for the calculation (the recableing
times can be modified in SET-UP).
§PI :
The measurement is started by pressing START /
STOPandstopsautomaticallywhenthePI ratiohas
beencalculated,i.e.after10minutes,thetimetaken
to recable the second insulation resistance value
neededforthecalculation(therecableingtimescan
be modified in SET-UP).
Remark : in this mode, the DAR ratio will also be
calculated automatically if the times needed to
calculate it are less than the second time needed to
calculate the PI ratio.
Important remarks
§
What is the DD (Dielectric Discharge index)?
In the case of multilayer insulation, if one of the layers is defective but the resistance of all the others is
high, neither the quantitative insulation measurement nor the calculation of the PI and DAR quality ratios
will reveal the problem.

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This makes it judicious to perform a dielectric discharge test, from which the DD term can be calculated.
This test measures the dielectric absorption of heterogeneous or multilayer insulation and disregards
parallel-surface leakage currents.
It involves applying a test voltage for long enough to electrically “charge” the insulation to be measured
(typically, a voltage of 500V is applied for 30mn).
At the end of the measurement, the instrument causes a rapid discharge, during which the capacitance of
the insulation is measured; 1mn later, the residual current circulating in the insulation is measured.
The DD term is then calculated as follows:
DD = current measured after 1 minute (mA) / [test voltage (V) x measured capacitance (F)]
The insulation quality rating as a function of the value found is as follows:
Note: The dielectric discharge test is especially well suited to insulation measurements on rotating
machines, and, in general, to insulation measurements on heterogeneous or multilayer insulations containing
organic materials.
§
What are the DAR (Dielectric Absorption Ratio) and the PI (Polarization Index)?
It is useful to calculate insulation quality ratios in addition to the quantitative insulation resistance value,
becausetheycanbe usedtoeliminatetheinfluenceofcertainparameterslikelyto invalidatethe«absolute»
insulationmeasurement.
The most important of these parameters are:
- temperature and relative humidity, with which insulation resistance varies to a quasi-exponential law.
-thespuriouscurrents(capacitivechargingcurrent,dielectricabsorptioncurrent)createdbytheapplication
ofthetestvoltage.Eventhoughtheygraduallyvanish,theyperturbthemeasurementatthestart,foralength
of time that depends on whether the insulation is in good condition or degraded.
Theseratiocompletethe“absolute”insulationvalue,andreliablyreflectwhetherthe insulationsareingood
or poor condition.
In addition, changes in these ratios over time can be observed and used for predictive maintenance, e.g.
to monitor the aging of the insulation of a population of rotating machines.
The DAR and PI ratios are calculated as follows:
PI = R 10 min / R 1 min (2 values to be noted during a 10-mn measurement.)
DAR = R 1 min / R 30 sec (2 values to be noted during a 1-mn measurement.)
Remark:
Note that the times of 1 & 10 mn for the calculation of PI and 30 & 60 seconds for the calculation of DAR
are those currently used and programmed as defaults in the instrument.
They can however be modified in SET-UP to adapt to a possible change in a standard or to the needs of a
specific application.
Value of DD Quality of insulation
DD > 7 Very poor
7 > DD > 4 Poor
4 > DD > 2 Doubtful
DD < 2 Good

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Interpretation of the results:
nThe
PRINT secondary function is described in § 6.3 ( Printing of measured values ).
4.2 DISPLAY /
GRAPH KEY
nFonction première DISPLAY
This key is used to browse through the various accessible screens containing all information available
before, during or after the measurement.
The screens vary depending to the mode selected before the measurement is started.
§
MANUAL STOP mode
Before the measurement
Information accessible :
During the measurement
DAR PI Condition of
insulation
< 1
< 1,25 < 2
Poor or even
dangerous
< 1,6 < 4 G ood
> 1,6 > 4 Excellent
First screen Press on
D IS P LAY
DC test voltage
AC / DC input voltage
Frequency
Residual current
Date, tim e
AC / DC input voltage
Frequency
Residual current
Voltage bargraph

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Information accessible :
After the measurement
Information accessible :
§ MANUAL STOP + DD mode
Before the measurement
Information accessible :
F ir st sc r e e n P re s s o n
D IS P L A Y
M e a s u re d re s ista n c e
D C te s t v o lta g e
R e s id u a l c u r re n t
M e a s u re m e n t d u ra tio n
In s u la tio n b a r g ra p h
M e a s u re d re s ista n c e
D C te s t v o lta g e
R e s id u a l c u r re n t
M e a s u re m e n t d u ra tio n
D A R , P I, C a p a c ita n c e
First screen Press on
DISPLAY 2nd press on DISPLAY
Measured resistance
DC test voltage
Spurious input current
Measurement duration
DAR, PI, Capacitance
Test voltage
AC / DCinput voltage
Frequency
Spurious input current
Date, time
AC / DCinput voltage
Frequency
Spurious input current
Voltage bargraph
First screen Press on
DISPLAY
DC test voltage
AC / DC input voltage
Frequency
Spurious input current
Date, time
AC / DC input voltage
Frequency
Spurious input current
Voltage bargraph

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During the measurement
Information accessible :
After the measurement
Information accessible :
First screen Press on
D IS P LAY
M easured resistance
DC test voltage
Spurious input current
M easurem ent duration
Insulation bargraph
M easured re sistance
DC test voltage
Spurious input current
M easurem ent duration
DAR, PI, Capacitance
Residual current
(for the calculation of DD)
DD
First screen Press on
DISPLAY
2nd press on
DISPLAY
Measured resistance
DC test voltage
Spurious input current
Measurement duration
DAR, PI, Capacitance
Residual current
(for the calculation of DD)
DD
DC test voltage
AC / DC input voltage
Frequency
Spurious input current
Date, time
AC / DC input voltage
Frequency
Spurious input current
Voltage bargraph

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1mn after the measurement
The first screen displays the value of DD and
the current used to calculate it (DD current)
§
TIMED RUN mode
Before the measurement
Information accessible :
During the measurement
First screen Presson
DISPLAY
DCtest voltage
Programmeddurationof test
AC/ DCinput voltage
Frequency
Residual current
Date, time
AC/ DCinput voltage
Frequency
Residual current
Voltagebargraph

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Information accessible :
After the measurement
Information accessible :
§ TIMED RUN + DD mode
Before the measurement
First screen Press on
DISPLAY
Measured resistance
DC test voltage
Residual current
Remaining measurement time
Insulation bargraph
Measured resistance
DC test voltage
Residual current
Remaining measurement time
DAR, PI, Capacitance
First screen Presson
DISPLAY 2
nd
presson DISPLAY
Measuredresistance
DCtestvoltage
Residual current
Measurement duration
DAR, PI, Capacitance
DCtestvoltage
Progrmmeddurationof test
AC/ DCinputvoltage
Frequency
Spuriousinput current
Date, time
AC/ DCinputvoltage
Frequency
Spuriousinput current
Voltagebargraph

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Information accessible :
During the measurement
Information accessible :
After the measurement
First screen Presson
DISPLAY
DCtest voltage
Programmeddurationof test
AC/ DCinputvoltage
Frequency
Residual current
Date, time
AC/ DCinputvoltage
Frequency
Residual current
Voltagebargraph
First screen Presson
DISPLAY
Measured resistance
DCtest voltage
Residual current
Remainingmeasurement time
Insulation bargraph
Measured resistance
DCtest voltage
Residual current
Remainingmeasurement time
DAR, PI, Capacitance
Residual current
(for thecalculation of DD)
DD

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Information accessible :
1 mn after the measurement
The first screen displays the value of DD and
the current used to calculate it (DD current)
§
DAR mode
Before the measurement
Information accessible :
First screen Presson
DISPLAY
2nd presson
DISPLAY
Measuredresistance
DCtest voltage
Spuriousinput current
Measurement duration
DAR, PI, Capacitance
Residual current
(for thecalculationof DD)
DD
DCtest voltage
AC/ DCinput voltage
Frequency
Spuriousinput current
Date, time
AC/ DCinput voltage
Frequency
Spuriousinput current
Voltagebargraph
First screen Press on
DISPLAY
DCtest voltage
Programmeddurationof test
AC/ DCinput voltage
Frequency
Residual current
Date, time
AC/ DCinput voltage
Frequency
Residual current
Voltagebargraph