Amprobe MEGATEST-1000 Megohmmeter User manual

MEGATEST 1000

MEGOHMMETER

Model #: AMB-6D

Owner’s Manual

1. OVERVIEW............................................................................................................................................................ 2

1.1 INITIAL INSPECTION .................................................................................................................................. 2

1.2 POWER SUPPLY ...........................................................................................................................................2

1.3 CALIBRATION.............................................................................................................................................. 2

1.4 STORAGE....................................................................................................................................................... 2

2. SAFETY PRECAUTIONS AND PROCEDURES...............................................................................................3

2.1 PRIOR TO USE ............................................................................................................................................. 3

2.3 DURING USE................................................................................................................................................. 4

2.4 AFTER USE....................................................................................................................................................4

3. INSTRUMENT DESCRIPTION........................................................................................................................... 5

3.1 ROTARY SWITCH POSITIONS ............................................................................................................................5

3.2 DEFINITION OF KEYS........................................................................................................................................6

4. CALIBRATION PROCEDURE............................................................................................................................ 7

4.1 CANCELLATION OF CALIBRATION PARAMETERS ............................................................................. 8

5. SWITCH POSITION FUNCTIONS: .................................................................................................................... 9

5.1 “LOWΩ” POSITION ......................................................................................................................................9

5.1.1 CONTINUITY TEST: ................................................................................................................................... 9

5.1.2 "AUTO", "R+", "R-", "R+TIMER", "R-TIMER" MODES: ......................................................................10

5.2 “MΩ” POSITION..........................................................................................................................................14

5.2.1 INSULATION RESISTANCE: ................................................................................................................ 14

5.2.2 “MAN”, “AUTO”, “TIMER” MODES ...................................................................................................14

5.3 HOW TO SAVE, RECALL AND CLEAR TEST DATA ............................................................................ 21

5.3.1 SAVE........................................................................................................................................................ 21

5.3.2 RECALL.................................................................................................................................................... 22

5.3.3 CLEAR ...................................................................................................................................................... 23

5.4 RESET PROCEDURE .................................................................................................................................. 24

5.5 DEFAULT PARAMETERS..........................................................................................................................24

5.5.1 DEFAULT PARAMETERS LOW

Ω

........................................................................................................... 24

5.5.2 DEFAULT PARAMETERS M

Ω

................................................................................................................ 24

5.5.3 MEMORY DEFAULT PARAMETERS...................................................................................................... 24

6. PRACTICAL EXAMPLES OF ELECTRICAL TESTS................................................................................... 25

6.1 LOW CONTINUITY MEASUREMENT .....................................................................................................25

6.2 INSTALLATION RESISTANCE................................................................................................................. 26

6.3 CHECKING THE CIRCUIT SEPARATION ...............................................................................................30

6.4 MEASUREMENT OF FLOOR INSULATION RESISTANCE IN MEDICAL ROOMS CEI 64-4............32

7. CONNECTING INSTRUMENT TO PC ............................................................................................................ 34

8. PRINTING OF DATA ON SERIAL PRINTER (OPTIONAL) ....................................................................... 35

9. MAINTENANCE.................................................................................................................................................. 36

9.1 GENERAL ....................................................................................................................................................36

9.2 BATTERY REPLACEMENT....................................................................................................................... 36

9.3 INSTRUMENT CLEANING ........................................................................................................................ 36

10. TECHNICAL SPECIFICATIONS................................................................................................................. 37

11. WARRANTY AND SERVICE CONDITIONS ............................................................................................. 40

1

1. OVERVIEW

Thank you for purchasing the MEGATEST 1000, Model AMB-6D, from Amprobe. We

have been in the marketplace for over 50 years and are a leader in the field of electrical

measurement.

We intend to satisfy our customers’ requirements by continuing to provide increasingly

reliable and innovative products.

This instrument was designed to provide the user with the utmost safety features thanks to

a new concept assuring double insulation and over voltage category III classification.

1.1 INITIAL INSPECTION

This instrument has been checked mechanically and electrically prior to shipment and

every care has been taken to ensure that the instrument reaches you in the proper

working order.

It is recommended, however, that you carry out a quick check of the instrument to detect

any possible damage that may have occurred during transport. If any damage is observed

please contact your dealer immediately.

Check also that the packaging contains all the parts listed under paragraph 10.1. If there

are any discrepancies please contact the dealer.

In case you have to send the instrument back please follow the instructions reported in

paragraph 11.

1.2 POWER SUPPLY

The AMB-6D is powered by six each, 1.5 Volt, “AA” alkaline batteries (not included).

For battery life information see paragraph 10.

When batteries are low the “battery symbol” is displayed.

To replace batteries follow the instructions in paragraph 9.2.

1.3 CALIBRATION

This instrument fulfils the technical specifications listed in this manual. The performance to

these specifications is guaranteed for one year. Annual re-calibration is recommended.

1.4 STORAGE

In order to ensure the accuracy of the measurements, after a period of storage in extreme

environmental conditions, wait for the time necessary so that the instrument is back to

normal measuring conditions (see environmental specifications listed in Section 10).

2

2. SAFETY PRECAUTIONS AND PROCEDURES

2.1 PRIOR TO USE

Please read and understand the following instructions BEFORE

using the AMB-6D. This

instrument can generate dangerously high voltages.

o WARNING: For your own safety, as well as the instrument and equipment

you are testing, it is recommended that you follow the

procedures described in this instruction manual and carefully

read all the notes preceded by the symbol

.

Strictly follow these instructions before and during measurements:

 Do not take measurements in environments with explosive gas, fuels or dust.

 Do not take measurements in wet environments.

 Do not touch exposed metal parts; i.e. alligator clips, ends of test leads, circuits, etc.,

while taking measurements.

 Prevent any accidental contact of others with the measuring voltage.

 Make sure the test voltage does not damage any component unable to withstand it.

 Do not take any measurement in case of unusual conditions with the instrument such

as deformation, breakage, leakage of substances, absence of display reading etc.

 The AMB-6D can be used for tests on electrical installations with over voltage category

III up to 250V (to Earth).

 You are recommended to comply with the standard safety regulations aimed at:

 Protecting you against dangerous currents.

 Protecting the instrument against improper use.

 Use only the test leads supplied with the instrument. They must be in good condition

and if they require replacement, they must be identical to those supplied with the

instrument (See Replacement Parts, paragraph 10.2)

 Do not take measurements on circuits exceeding the specified voltage limits.

 Do not take any measurement under environmental conditions beyond the limits

specified in Section 10.

 Check that batteries have been installed correctly.

 Before connecting test leads to the circuit under test, check to be sure that the rotary

switch is in the correct position.

 Check that LCD and rotary switch indicate the same function.

3

The following symbols are used in this manual:

Caution: refer to the instructions reported in this manual; improper use may

damage the apparatus or its components.

Rotary switch of the instrument.

2.3 DURING USE

Carefully read the following recommendations and instructions:

o WARNING: Non compliance with the Warnings and/or Instructions may

damage the instrument and/or its components or injure the

operator.

 Before selecting any function disconnect the test leads from the circuit under test.

 When the instrument is connected to the tested circuit never touch any test lead which

is not

being used.

 Avoid taking resistance measurements in the presence of external voltages; even

though the instrument is protected, high voltage may cause malfunctions.

o WARNING: If the symbol is displayed during use interrupt testing and

replace batteries following the procedure described under

paragraph 9.2.

Note: The instrument is capable of keeping the data stored even

though batteries are not installed.

2.4 AFTER USE

 After the measurements are completed turn the rotary switch to the “OFF” position.

 Remove batteries if the instrument is to remain unused for long periods of time.

4

3. INSTRUMENT DESCRIPTION

OFF

ESC

DISPLAY

SAVE

RECALL

GO

CLEAR

2

3

1

4

Rotary

switch:

Selects the

instrument

function

Front panel of the Instrument

3.1 Rotary Switch Positions

 LOWΩ: Continuity test of earth, protective and equalising potential conductors with test

current higher than 200 mA and open circuit voltage ranging from 4V to 24V.

 MΩ: Measurement of insulation resistance with DC test voltage 50V, 100V, 250V,

500V or 1000V.

 RS232 To transfer stored data or print via a PC.

5

3.2 Definition of Keys

#1 Multifunction key to select measuring mode.

FUNC

#2 Key for selection the rated voltage during test of insulation

resistance.

U

n

#3 Key used to increase the test duration interval or to scroll the

results of the stored tests.

▲

#4 Key used to decrease the test duration interval or to scroll the

results of the stored tests.

▼

GO

 Key to start or stop tests.

ESC

 Key to quit the function or selected mode.

SAVE

 Key to save tests.

RCL

 Key to recall the stored tests.

DISP

 Key to displays test results at selected memory locations

CLR

 Key to cancel the stored tests.

6

4. CALIBRATION PROCEDURE

1. Select mode CAL by means of the FUNC key.

2. Connect the black and blue cables to the instrument input terminals P and N

respectively:

Connection of instrument terminals during calibration procedure.

3. Connect the alligator clips to the test leads.

4. Short-circuit the test leads by joining the alligator clips together, making sure there is good

contact between them. (See figure above).

6. Press the GO key. The instrument carries out the calibration.

GO



CAL LOWΩ

0.00 Ω

203 mA

A

t the end of the test the

result is stored and used as

an OFFSET (that is to say

that it is subtracted from

any continuity test

carried out) for all the

subsequent measurements

until a new calibration is

carried out.

This screen is displayed for only 2 seconds then

the instrument emits a double sound signal

(indicating that the calibration is completed) and

displays the default screen relative to the LOWΩ test

under AUTO mode.

Message CAL:

means that the

instrument was

calibrated; this

symbol remains

on the display

for any furthe

r

measurement

even though the

unit is switched

off and on again.

Current supplied

by the instrumen

t

during the

calibration

p

rocedure.

Note

: The instrument compensates for resistance of the cables when the

resistance is lower than 5Ω.

o ATTENTION: The display of “Measuring” means that the instrument is

measuring and voltage is present. Never touch or disconnect

test leads during this phase.

7

4.1 CANCELLATION OF CALIBRATION PARAMETERS

LOWΩ

o> 5 Ω

cal

Measuring

To cancel calibration parameters

(and the symbol CAL) it is

necessary to recalibrate the

instrument with a resistance

higher than 5Ω (for example with

disconnected test leads). When a

cancellation is made the screen

on the right is displayed first,

followed by the screen below:

Message >5

Ω

:

means that the

instrument detected

a resistance higher

than 5Ω therefore it

will proceed with

Reset procedure.

LOWΩ

es

cal

The screen on the right is

displayed for 2 seconds, after

which the instrument emits a long

sound signal and then displays

the default screen relative to the

LOWΩ test under AUTO mode.

Message rES:

means that the

instrument

cancelled the

calibration

parameter

(RESET) of the

calibration

parameters

8

5. SWITCH POSITION FUNCTIONS:

5.1 “LOWΩ” POSITION

5.1.1 CONTINUITY TEST:

Continuity test of earth, protective and equalizing potential conductors with a test current

higher than 200 mA and open circuit voltage ranging from 4v TO 24v

o WARNING: Before carrying out the continuity test make sure that there is no

voltage at the ends of the conductor under test.

Turn the switch on LOWΩ position.

The key FUNC permits to select one of the following measuring modes

(which can be shown cyclically when pressing this key):

FUNC

 Mode “AUTO” (the instrument carries out two measurements with

reversed polarity and displays their average value). This mode is

recommended for the continuity test.

 Mode “R +” (measurement with positive polarity, black cable connected

to positive polarity and blue cable connected to negative polarity). This

mode can be used to evaluate the galvanic effect occurring at the ends

of the installation cable terminals (they are usually made of galvanised

iron) during the continuity test.

 Mode “ R -“ (measurement with negative polarity, black cable connected

to negative polarity and blue cable connected to positive polarity). This

mode can be used to evaluate the galvanic effect occurring at the ends

of the installation cable terminals (they are usually made of galvanised

iron) during the continuity test reversing polarity with respect to the

previous mode (R+).

 Mode “R + TIMER (measurement with positive polarity and possibility of

setting the duration time of the test). In this case the operator can set a

measuring time long enough to permit him to move the protective

conductors while the instrument is carrying out the test so detecting any

bad connection.

 Mode “R - TIMER” (measurement with negative polarity and possibility of

setting the duration time of the test). In this case the operator can set a

measuring time long enough to permit him to move the protective

conductors while the instrument is carrying out the test so detecting any

bad connection.

 Mode “CAL” (compensation of the resistance of the cables used for the

measurement).

Note:

If the resistance is lower than 16Ω (including the resistance of the calibration

results) the continuity test is made by the instrument with a current higher than

200mA. If the resistance is higher than 16Ω the continuity test is made by the

instrument using a current of 40mA.

9

5.1.2 "AUTO", "R+", "R-", "R+TIMER", "R-TIMER" MODES:

1. Select the desired mode by means of the FUNC key.

2. Connect the black and blue cables to the instrument input terminals P and N

respectively.

Connection of the instrument terminals during LOWΩ test.

3. Connect two alligator clips to the test leads.

4. Short-circuit the measuring cable ends making sure that the conductive parts of the clips

make a good contact to each other. (See section 3.1.1) Press the GO key. If the

instrument displays a resistance value other than 0.00 repeat the instrument

calibration (see paragraph 4).

6. Connect the instrument terminals to the ends of the conductor on which the continuity test is

to be carried out (see previous picture).

7. If the mode "R+TIMER" or "R-TIMER" was selected use the following keys to select

the duration time of the test:

▲

press this key to increase the duration time of the test (Tmax=15 seconds).

▼

press this key to decrease the duration time of the test (Tmin=3 seconds).

8. Press the GO key. The instrument effects the measurement.

GO

In R+/R- Timer mode

press GO key again if the test is to be stopped.

o WARNING: The display of “Measuring” means that the instrument is

measuring and voltage is present. Never touch or disconnect

test leads during this phase.

10

5.1.2.1 "AUTO" MODE



CAL LOWΩ

1.07 Ω

219 mA

AUTO

At the end of the test, if the average

resistance value Ravg results to be

lower than 5Ω

the instrument emits a

double sound signal indicating the

positive outcome of the test and

displays one screen similar to the

screen alongside.

Average tes

t

current value

Iavg.

Average

resistance

value Ravg.

SAVE

The test can be stored pressing the SAVE key twice (according to

paragraph 0).

5.1.2.2 "R+" or “R-" MODE



CAL LOWΩ

1.07 Ω

219 mA

R+

R-

At the end of the test if a resistance

value R+ or

R- lower than 5Ω was detected, the

instrument emits a double sound

signal indicating the positive

outcome of the test and displays

one screen similar to the screen

alongside.

Resistance

value R+ o

r

R-.

Value of tes

t

current I+ or I-.

Either the symbol R+ or

the symbol R

-.

SAVE

The test can be stored pressing the SAVE key twice (according to

paragraph 0).

5.1.2.3 "R+TIMER" or “R-TIMER" MODE



CAL LOWΩ

1.08 Ω

219 mA 5 s

R+

R-

T

IMER

At the end of the test if a resistance

value R+Timer or R–Timer lower

than 5Ω was detected, the instrument

(after the set time has elapsed) emits

a double sound signal indicating

the positive outcome of the test

displays one screen similar to the

screen alongside.

Duration time o

f

the test.

Value of the

test current I+

or I-.

The symbols R+ or R- are displayed.

SAVE

The test can be stored by pressing the SAVE key twice (see paragraph 0).

11

5.1.2.4 ANOMALOUS CASES:

Anomalous cases which can occur during the following "AUTO", "R+", "R-", "R+TIMER",

"R-TIMER"



CAL LOWΩ

o 5.75 Ω

216 mA 5s

AUTO

In case a value of Ravg or R+ or R-

higher than or equal to 5Ω but

lower than 99.9Ω (9.99Ω in

R+TIMER and R-TIMER) was

detected, at the end of the test the

instrument emits a long sound

signal displays one screen similar to

the screen alongside.

ATTENTION:

average value

of Ravg highe

r

than 5Ω.

The tests can be stored pressing the SAVE key twice (according to

paragraph 0).



CAL LOWΩ

o> 99.9 Ω

- - - mA

AUTO

In case one of the following modes

AUTO, R+, R- and a Ravg or R+ or

R- higher than 99.9Ω was selected,

at the end of the test the instrument

emits a long sound signal and

displays the screen alongside.

The tests can be stored pressing the SAVE key twice (according to

paragraph 0).

99.9

Ω

is the

maximum

value which

can be

measured in

the LOW

Ω

AUTO o

r

R+ or R-

mode.

SAVE

Selected mode (in the picture the mode AUTO

is indicated as exam

p

le

)

.

ATTENTION: value of R

avg

or R+ or R- is too

hi

gh.

Only in case

the mode

R+TIMER o

r

R-TIMER was

selected.

Selected mode (in the picture the

mode AUTO is indicated as

exam

p

le

)

.

SAVE



CAL LOWΩ

o A

VOL AG

If the terminal voltage is higher than

10V, the instrument does not carry

out the test and displays the screen

alongside for 5 seconds after which,

the instrument displays the screen

relative to the precedent selected test

mode LOWΩ under AUTO mode.

ATTENTION:

the test was

not made

Due to voltage

at the terminal

ends.

THIS RESULT CANNOT BE SAVED

SAVE

12



CAL LOWΩ

o> 9.99 Ω

- - - mA 4 s

R+

TIMER

In case the mode R+TIMER or R-

TIMER was selected and a R+ or R-

higher than 9.99Ω was detected, the

instrument emits an intermittent

sound signal during the test, a

long sound signal at the end of the

test and displays the screen

alongside.

The tests can be stored pressing the SAVE key twice (see

paragraph 0).

9.99

Ω

is the

maximum

value which

can be

measured in

LOWΩ,

R+TIMER

or R-TIME

mode.

R

ATTENTION: value of R+ or R- is too high.

SAVE



CAL LOWΩ

o 0.00 Ω

219 mA

A

UTO

In case that:

R

MEASURED

-R

CALIBRATION

< 0Ω the

instrument displays the screen

alongside.

blinking CAL.

ATTENTION: R

MEASURED

-R

CALIBRATION

< 0 .

Selected mode: (in this case

AUTO).

SAVE

The tests can be stored pressing the SAVE key twice (according to

paragraph 0).

13

5.2 “MΩ” POSITION

5.2.1 INSULATION RESISTANCE:

INSULATION RESISTANCE MEASUREMENT WITH TEST VOLTAGE OF 50V, 100V,

250V, 500V OR 1000V

o ATTENTION: Before making the insulation test make sure that the circuit

under test is not energised and all the relative loads are

disconnected.

Turn the switch on MΩ position.

The key FUNC permits to select one of the following measuring modes

(which can be shown cyclically when pressing the key):

FUNC

 Mode “MAN” (maximum test time of 10 seconds or set by the pressing

duration on the GO key). Recommended test.

 Mode “AUTO” (the test ends when the measured value gets stable). This

test can be effected in case the installation has some capacities which

are to be charged in order to evaluate the real insulation resistance.

 Mode “TIMER” (test duration depending on the selected interval (from 10

to 999 seconds). This test can be effected in case a minimum measuring

time is required.

5.2.2 “MAN”, “AUTO”, “TIMER” MODES

Procedure to measure the insulation resistance valid for modes "MAN", "AUTO", "TIMER"

1. Select the desired mode by means of the FUNC key.

2. Connect the black and blue cables to the instrument input terminals P and N

respectively,

Example for the use of the instrument to check

insulation between phase and earth in an electrical

installation using untied cables.

Connection of the instrument terminals for MΩ test.

14

3. Connect the test leads to the object which is to be tested after deactivating the

circuit to be tested and all the relative loads (see previous picture).

4. By means of U

n

select the test voltage suitable for the type of test to be

carried out. The values to be selected are:

U

n

• 50V (test on telecommunications systems)

• 100V

• 250V

• 500V

• 1000V

5. If the mode "TIMER" was selected use the following keys to set the duration time of

the test:

press this key to increase the duration time of the test (Tmax=999 seconds).

▲

▼

press this key to decrease the duration time of the test (Tmin=10 seconds).

o ATTENTION: If “Measuring” is displayed the instrument is taking the

measurement. During this phase do not disconnect the test

leads as the circuit under test may remain charged at a

dangerous voltage due to the parasite capacities of the

installation. Independently of the working mode selected the

instrument throws a resistance in the output terminals at the

end of each test to discharge the parasite capacities of the

circuit.

15

5.2.2.1 "MAN" MODE

GO

Press the GO key.

The instrument effects the test lasting:

 Maximum 10 seconds in case the key is pressed and released

within 5 seconds.

 Until the key is released for all the other cases.

Note

: Press the GO key again if the test is to be stopped



R

ISO

1.00 MΩ

500 V 20 s

MAN

At the end of the test, in case the

resistance value MΩ detected

results to be lower than R

MAX

(depending on the selected voltage

see following Table 4) and the test is

effected at the selected rated

voltage value, the instrument emits a

double sound signal indicating the

positive outcome of the test

displays one screen similar to the

screen alongside.

Insulation

resistance

value R

ISO.

Test duration.

In this case the GO

key has been

pressed for 20

seconds.

Manual mode.

Rated voltage value selected for the test.

The values of measured resistance of isolation always must be confronted with the

normative limits (see Errore. L'origine riferimento non è stata trovata.) for being able to

assert if the system is to norm.

SAVE

The test can be stored pressing the SAVE key twice (according to

paragraph 0).

16

5.2.2.2 "AUTO" MODE

GO

Press the GO key. The instrument effects the measurement ending

when the measured value gets stable.

Note

: Press the GO key again if the test is to be stopped



R

ISO

1.18 MΩ

500 V 18 s

AUTO

At the end of the test, in case the

resistance value MΩ detected

results to be lower than R

MAX

(depending on the selected voltage

see following Table 3), the test is

effected at the selected rated

voltage value and a stable value of

the resistance is detected, the

instrument emits a double sound

signal indicating the positive

outcome of the test displays one

screen similar to the screen

alongside.

Insulation

resistance

value R

ISO.

Automatic mode.

Test duration.

In this case the

measurement

got stable afte

r

18 seconds.

Rated voltage value selected for the test.

SAVE

The test can be stored pressing the SAVE key twice (according to

paragraph 0).

17

5.2.2.3 "TIMER" MODE

GO

Press the GO key. The instrument effects the measurement ending

when the set time has elapsed.

999 seconds → Maximum value of the test duration.

10 seconds → Minimum value of the test duration.

Note:

Pressing the GO key again the test gets immediately

interrupted.



R

ISO

2.07 MΩ

500 V 20 s

TIMER

At the end of the test, in case the

resistance value MΩ detected

results to be lower than R

MAX

(depending on the selected voltage

see following Table 1) and the test is

effected at the selected rated

voltage value, the instrument emits a

double sound signal indicating the

positive outcome of the test

displays one screen similar to the

screen alongside.

Insulation

resistance

value R

ISO.

Duration of the set

test.

Rated voltage value selected for the Timer test.

Timer mode.

The values of measured resistance of isolation always must be confronted with the

normative limits for being able to assert if the system is to norm.

SAVE

The test can be stored pressing the SAVE key twice (according to

paragraph 0).

Note

The maximum resistance value R

MAX

which can be measured in mode MΩ

depends on the rated voltage selected for the test. In particular:

Rated voltage selected

for the test

R

MAX

= Maximum resistance

value

50VDC

99.9MΩ

100VDC

199.9MΩ

250VDC

499MΩ

500VDC

999MΩ

1000VDC

1999MΩ

Table1: Table of maximum resistance values which can be measured under MΩ

mode depending on the rated voltage selected.

18

5.2.2.4 ANOMALOUS CASES:

Anomalous cases which may occur during the insulation tests "MAN", "AUTO", "TIMER"

The symbol ">" means that the resistance value R

ISO

is higher than R

MAX

.



R

ISO

> 999 MΩ

500 V 20 s

MAN

In case a value of MΩ higher than

R

MAX

was detected (depending on the

selected voltage see following Note

Table, the instrument emits a double

sound signal at the end of the test

indicating the positive outcome of

the test and displays one screen

similar to the screen alongside.

Maximum

resistance

value which

can be

measured

(999Ω is

displayed i

f

a rated

voltage o

f

500V was

selected

see Table).

Test duration.

Selected mode (MAN is indicated in the

picture).

SAVE

The test can be stored pressing the SAVE key twice (according to

paragraph 0).



R

ISO

o0.01 MΩ

500 V 20 s

MAN

In case a test is taken at a voltage

lower than the set rated voltage, at

the end of the test the instrument

emits a long sound signal and

displays one screen similar to the

screen alongside.

ATTENTION: the test of resistance M

Ω

was taken at a

voltage value lower than the set rated voltage. Low

insulation case. This case occurs under low insulation

conditions or in the presence of capacity on the

installation.

Selected mode (MAN is

indicated in the picture).

SAVE

The tests can be stored pressing the SAVE key twice (according to

paragraph 0).

19

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