How it Works
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MEGATEST-1000
User Manual [en, es]
100 pgs1.65 Mb0
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Amprobe MEGATEST-1000 User Manual [en, es]

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
5.2 “MΩ” POSITION.......................................................................................................................................... 14
5.3 HOW TO SAVE, RECALL AND CLEAR TEST DATA ............................................................................21
5.4 RESET PROCEDURE .................................................................................................................................. 24
5.5 DEFAULT PARAMETERS..........................................................................................................................24
5.5.1 DEFAULT PARAMETERS LOWΩ........................................................................................................... 24
5.5.2 DEFAULT PARAMETERS MΩ................................................................................................................ 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 instrument can generate dangerously high voltages.
using the AMB-6D. This
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
Rotary switch:
Selects the instrument function
2
1
OFF
DISPLAY
CLEAR
RECALL
GO
ESC
SAVE
3
4
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.
#2 Key for selection the rated voltage during test of insulation
#3 Key used to increase the test duration interval or to scroll the
#4 Key used to decrease the test duration interval or to scroll the
GO
GO
ESC
SAVE
RCL
DISP
CLR
FUNC
U
n
resistance.
▲
results of the stored tests.
▼
results of the stored tests.
Key to start or stop tests.
Key to quit the function or selected mode.
Key to save tests.
Key to recall the stored tests.
Key to displays test results at selected memory locations
Key to cancel the stored tests.
6
4. CALIBRATION PROCEDURE
A
r
t
p
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
Note
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.
: The instrument compensates for resistance of the cables when the
resistance is lower than 5Ω.
CAL LOWΩ
0.00 Ω
203 mA
Message CAL: means that the instrument was calibrated; this symbol remains
on the display for any furthe measurement
even though the unit is switched off and on again.
Current supplied by the instrumen during the calibration
rocedure.
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
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:
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.
LOWΩ
o> 5 Ω
cal
Measuring
LOWΩ
es
cal
Message >5Ω: means that the instrument detected a resistance higher than 5Ω therefore it will proceed with Reset procedure.
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.
FUNC
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.
The key FUNC permits to select one of the following measuring modes (which can be shown cyclically when pressing this key):
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).
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:
▲
▼
8. Press the GO key. The instrument effects the measurement.
GO
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).
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
t
r
t
T
At the end of the test, if the average
resistance value Ravg results to be lower than 5Ω double sound signal indicating the positive outcome of the test and
displays one screen similar to the screen alongside.
SAVE
5.1.2.2 "R+" or “R-" MODE
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.
SAVE
5.1.2.3 "R+TIMER" or “R-TIMER" MODE
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.
SAVE
The symbols R+ or R- are displayed.
The test can be stored by pressing the SAVE key twice (see paragraph 0).
the instrument emits a
The test can be stored pressing the SAVE key twice (according to paragraph 0).
Either the symbol R+ or the symbol R
The test can be stored pressing the SAVE key twice (according to paragraph 0).
-.
CAL LOWΩ
1.07 Ω
219 mA
AUTO
CAL LOWΩ
1.07 Ω
219 mA
R+ R-
CAL LOWΩ
1.08 Ω
219 mA 5 s
R+ R-
IMER
Average resistance value Ravg.
Average tes current value Iavg.
Resistance value R+ o R-.
Value of tes current I+ or I-.
Duration time of the test.
Value of the test current I+ or I-.
11
5.1.2.4 ANOMALOUS CASES:
r
Ω
r
r
Anomalous cases which can occur during the following "AUTO", "R+", "R-", "R+TIMER",
"R-TIMER"
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.
SAVE
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.
Selected mode (in the picture the mode AUTO is indicated as example).
SAVE
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.
Selected mode (in the picture the mode AUTO is indicated as example).
The tests can be stored pressing the SAVE key twice (according to paragraph 0).
ATTENTION: value of R hi
gh.
The tests can be stored pressing the SAVE key twice (according to paragraph 0).
CAL LOWΩ
o 5.75 Ω
216 mA 5s
AUTO
CAL LOWΩ
o> 99.9 Ω
- - - mA
AUTO
or R+ or R- is too
avg
CAL LOWΩ
o A
VOL AG
ATTENTION: average value of Ravg highe than 5Ω.
Only in case the mode R+TIMER o R-TIMER was selected.
99.9Ω is the maximum value which can be measured in the LOW
AUTO o R+ or R­mode.
ATTENTION: the test was not made
Due to voltage at the terminal ends.
THIS RESULT CANNOT BE SAVED
SAVE
12
A
In case the mode R+TIMER or R­TIMER 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.
ATTENTION: value of R+ or R- is too high.
SAVE
In case that:
R
MEASURED-RCALIBRATION
instrument displays the screen alongside.
ATTENTION: R
Selected mode: (in this case AUTO).
The tests can be stored pressing the SAVE key twice (see paragraph 0).
< 0Ω the
MEASURED-RCALIBRATION
< 0 .
CAL LOWΩ
o> 9.99 Ω
TIMER
CAL LOWΩ
UTO
- - - mA 4 s
R+
o 0.00 Ω
219 mA
9.99Ω is the maximum value which can be measured in
LOWΩ, R+TIMER or R-TIME mode.
blinking CAL.
R
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.
FUNC
5.2.2 “MAN”, “AUTO”, “TIMER” MODES
The key FUNC permits to select one of the following measuring modes (which can be shown cyclically when pressing the key):
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.
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
5. If the mode "TIMER" was selected use the following keys to set the duration time of
U
n
the test:
▲
▼
carried out. The values to be selected are:
• 50V (test on telecommunications systems)
• 100V
• 250V
• 500V
• 1000V
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).
select the test voltage suitable for the type of test to be
n
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
At the end of the test, in case the
resistance value MΩ detected results to be lower than R
(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.
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
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
Insulation resistance value R
ISO.
MAX
R
ISO
1.00 MΩ
500 V 20 s
MAN
Rated voltage value selected for the test.
The test can be stored pressing the SAVE key twice (according to paragraph 0).
Test duration. In this case the GO key has been pressed for 20 seconds.
Manual mode.
16
5.2.2.2 "AUTO" MODE
r
GO
At the end of the test, in case the
resistance value MΩ detected results to be lower than R
(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.
SAVE
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
Rated voltage value selected for the test.
The test can be stored pressing the SAVE key twice (according to paragraph 0).
MAX
R
ISO
1.18 MΩ
500 V 18 s
AUTO
Insulation resistance value R
Test duration. In this case the measurement got stable afte 18 seconds.
Automatic mode.
ISO.
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.
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
R
ISO
2.07 MΩ
Insulation resistance value R
ISO.
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
500 V 20 s
TIMER
Timer mode.
Duration of the set test.
screen alongside.
Rated voltage value selected for the Timer test.
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
which can be measured in mode MΩ
MAX
depends on the rated voltage selected for the test. In particular:
Rated voltage selected
for the test
50VDC 100VDC 250VDC 500VDC
1000VDC
R
= Maximum resistance
MAX
value
99.9MΩ
199.9MΩ 499MΩ 999MΩ
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:
f
f
Ω
Anomalous cases which may occur during the insulation tests "MAN", "AUTO", "TIMER"
The symbol ">" means that the resistance value R
In case a value of MΩ higher than
R
was detected (depending on the
MAX
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.
Selected mode (MAN is indicated in the picture).
is higher than R
ISO
.
MAX
R
ISO
> 999 MΩ
500 V 20 s
MAN
Test duration.
Maximum resistance value which can be measured (999Ω is displayed i a rated voltage o 500V was selected see Table).
The test can be stored pressing the SAVE key twice (according to
SAVE
paragraph 0).
In case a test is taken at a voltage
R
ISO
lower than the set rated voltage, at
the end of the test the instrument
o0.01 MΩ
emits a long sound signal and displays one screen similar to the screen alongside.
ATTENTION: the test of resistance M 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.
was taken at a
500 V 20 s
MAN
Selected mode (MAN is indicated in the picture).
The tests can be stored pressing the SAVE key twice (according to
SAVE
paragraph 0).
19
If the terminal voltage is higher than 30V, the instrument will not take the test, displays the screen alongside for 5 seconds after which, it shows the default screen relative to the MΩ test under AUTO mode.
R
ISO
o A
VOL AG
ATTENTION: the test was not carried out. Check that the circuit is not energised.
SAVE
SAVE
If the instrument gets overheated, tests cannot be carried out and the message alongside is displayed. Wait until the initial screen is back in order to proceed with measurements.
Message “hot”: the instrument got overheated.
THIS RESULT CANNOT BE SAVED.
THIS RESULT CANNOT BE SAVED.
R
ISO
o
20
5.3 HOW TO SAVE, RECALL AND CLEAR TEST DATA
the
easurement results
stored
easurement to be saved
5.3.1 SAVE
If the results relative to the tests effected are to be stored you can proceed as follows:
1. Press the SAVE key once.
SAVE
If the memory of the instrument is not empty it displays the screen to the right.
Number of the memory location in which
m
Value of the parameter P related to the m
If the test cannot be saved the instrument displays the screen on the right.
will be
.
.
MEM
3
P02
MEM
o
2. Use the keys ▼, ▲ to increase or decrease the value of the parameter
3. Press the SAVE key again, the instrument emits two sound signals,
▼
▲
SAVE
ESC
P to be related to the measurement which is to be saved. This
parameter helps the operator to classify the tests effected.
Example: if the tests are to be carried out in a building, the operator
can associate the measurements effected in a room with a given value of the parameter P. In this way different value of the parameter P will correspond to different rooms.
confirming that the test results have been stored.
Press the ESC key in any moment management mode and go back to the selected measuring function.
you want to quit the memory
21
5.3.2 RECALL
saved measurement
If you want to recall the stored test results proceed as follows:
1. Press the RCL key.
RCL
If the memory of the instrument is not empty it displays the screen alongside.
Number of the memory location in which the measurement results were stored.
Value of the parameter P related to the
If the memory of the instrument is empty it displays the screen alongside.
.
MEM
3
P02
Riso
o
no rcl
2. Use the keys ▼, ▲ to select the memory location number to be
3. Press the DISP key to display the test result related to the selected
4. Use the keys ▼, ▲ again if you want to display again the numbers of
▼
▲
DISP
▼
▲
ESC
displayed.
memory location.
memory locations.
Press the ESC key at any point management mode and go back to the selected measuring function.
you want to quit the memory
22
5.3.3 CLEAR
the
easurement results were stored
saved measurement
If you want to cancel the stored tests results proceed as follows:
1. Press the RCL key. The instrument displays a screen like the
RCL
following:
MEM
Number of the memory location in which
m
Value of the parameter P related to the
.
2. Use the keys ▼, ▲ to select the number of the memory location.
3. Press the DISP key to display the test result related to the memory
4. Press CLR once. The blinking
▼
▲
DISP
CLR
ATTENTION: the instrument will cancel all the results stored from the
memory location selected to the last memory location full.
location selected. In case that a few results were stored in the memory location (Ex: RCD test under AUTO mode) it is necessary to press DISP more than once to display them.
face two possibilities:
.
P02
symbol "clr" is displayed. Now you
Blinking.
MEM
3
clr
The instrument cancels the memory cells from n.2 to n.8, where n.2 is the one selected by the operator while n.8 is the last test saved in the instrument.
p 08
CLR
ESC
ESC
Press CLR again if the tests selected are to be cancelled starting from the one selected down to the last one saved.
Press ESC to nullify the clearing phase. The blinking symbol "clr" disappears.
Press the ESC key at any point mode and return to the selected measurement function.
if you want to quit the memory management
23
Example: 97 tests have been stored in the instrument. If you want to cancel the tests from 43rd to 97
- Press RCL.
- Select with keys ▼, ▲ the memory location 43.
- Press CLR. You can see CLR blinking on the primary display, 43 on the
left secondary display and 97 on the righ secondary display.
- Press CLR. The tests from 43 to 97 has cancelled.
th
, you proceed as follows:
5.4 RESET PROCEDURE
Reset of the INSTRUMENT and default parameters
Press DISP, CLR, RCL at the same time the rotary switch is turned on.
The screen nearby is displayed for 5 seconds, after which the
instrument emits a sound signal and then displays the screen relative to the function selected with the rotary switch.
rES
ATTENTION: the reset procedure will erase all the stored tests and it will set the default
parameters in the instrument.
Before conducting a reset procedure, download the stored tests on a PC.
5.5 DEFAULT PARAMETERS
Ω
5.5.1 DEFAULT PARAMETERS LOW
Parameter Reset default parameter Mode AUTO Calibration Offset 0 (CAL off) Mode R+/R- TIMER Timer 3s
5.5.2 DEFAULT PARAMETERS MΩ
Parameter Reset default parameter Mode MAN Test voltage 500V Mode TIMER Timer 60s
5.5.3 MEMORY DEFAULT PARAMETERS
Parameter Reset default parameter Parameter P P = 1 Memory state 1(empty)
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6. PRACTICAL EXAMPLES OF ELECTRICAL TESTS
r
t
r
r
r
r
6.1 LOW CONTINUITY MEASUREMENT
CONTINUITY MEASUREMENT ON PROTECTIVE CONDUCTORS
PURPOSE OF THE TEST
Check the continuity of: protective conductors (PE), main equalising potential
conductors (EQP), secondary equalising potential conductors (EQS) in TT and TN-S systems.
neutral conductors having functions of protective
conductors (PEN) in TN-C system.
NOTE: This test is to be preceded by a visual check verifying the existence of yellow-
green protective and equalising potential conductors as well as compliance of the sections used with the standards’ requirements.
INSTALLATION PARTS TO BE CHECKED.
Equalising potential node
Connect one of the test leads to the protective conducto of the FM socke and the other to the equalising potential node of the earth installation.
Connect one of the test lead to the external mass (in this case the wate pipe) and the othe to the earth installation using fo example the protective conducto of the closest FM socket.
Examples for continuity measurement on conductors
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Check the continuity among: a) earth poles of all the plugs and earth collector or node. b) earth terminals of class I instruments (Boiler etc.) and earth collector or node. c) main external masses (water, gas pipes etc.) and earth collector or node. d) auxiliary external masses to the earth terminal.
ALLOWABLE VALUES
The standards CEI 64-8/6 do not give any indication on the maximum resistance values which cannot be overcome, in order to be able to declare the positive outcome of the continuity test.
The standard CEI 64-8/6 simply requires that the instrument in use warns the operator if the test was not carried out with a current of at least 0.2 A and an open circuit voltage ranging from 4 V to 24 V.
The resistance values can be calculated according to the sections and lengths of the conductors under test, anyway if the instrument detects values of some ohm the test can be considered as passed.
6.2 INSTALLATION RESISTANCE
INSTALLATION RESISTANCE MEASUREMENT OF ELECTRICAL INSTALLATIONS (250VDC, 500VDC, 1000VDC)
PURPOSE OF THE TEST
Check that the insulation resistance of the installation complies with the requirements of standards CEI 64-8/6.
NOTE: This test is to be made on an open circuit with any load disconnected.
INSTALLATION PARTS TO BE CHECKED
a) Between each active conductor and the earth (the neutral conductor is considered
an active conductor except in the case of TN-C systems where it is considered part of the earth (PEN). During this measurement all active conductors can case the measurement result does not fall within the standard limits the test is to be repeated for each single conductor.
b) Among active conductors
The standard CEI 64-8/6 recommends to check the insulation among the active conductors when this is possible (ATTENTION)
.
be connected to each other, in
.
26
Insulation measurements in a facility.
A procedure indicating how to take the insulation resistance measurement of a facility is reported in the following table:
27
Procedure for insulation resistance measurement referring to the previous picture:
Switch situation Point under test Measurement result
Turn the switch A,
1
2
3
4
5
l D and E off
Turn the switch B
off
Turn the switch C
off
Take the measurement on switch A
Take the measurement
on switch A
Take the measurement
on switch B
Take the measurement
on switch B
Take the measurement
on switch C
Se R ≥ R Se R< R
Se R ≥ R
Se R< R
Se R ≥ R Se R< R
Se R ≥ R
Se R< R
Se R ≥ R
Se R< R
LIMITE
LIMITE
LIMITE
LIMITE
LIMITE
LIMITE
LIMITE
LIMITE
LIMITE
LIMITE
Judgement of an installation
☺ OK (end of the test)
Proceed 2
Proceed 3
INSTALLATION
NOT COMPLYING WITH STANDARDS
☺ OK (end of the test)
Proceed 4
Proceed 5
INSTALLATION
NOT COMPLYING WITH STANDARDS
☺ OK (end of the test) INSTALLATION
NOT COMPLYING WITH STANDARDS
Table1: Table with procedure steps for insulation measurement referred to the installation reported in Errore. L'origine riferimento non è stata trovata.
Note The switches D and E are those installed near the load having the purpose of
separating it from the installation. In case the above said RCDs do not exist it is necessary to disconnect the users from the before making the insulation resistance test.
ATTENTION:
If the installation includes electronic devices, disconnect them from the installation and in case this is impossible only the test "a" is to be effected, that is to say between active conductors (which in this case SHALL be connected together) and the earth.
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ALLOWABLE VALUES
The values of test voltage and minimum insulation resistance are reported in the following table (CEI64-8/6 Tab. 61A):
Rated circuit voltage
(V)
SELV and PELV* 250 ###0.250
Up to 500 V included, except for the above circuits.
Over 500 V 1000 ###1.000
* In the new standards the terms SELV and PELV replace the old definitions
"safety low voltage" or "functional".
Table2: Table summarising the test voltage values and relative limit values for
the most common kinds of test.
NOTE:
If the circuit is quite large the conductors running side by side make up a capacity
which is to be charged by the instrument in order to carry out a correct measurement; in this case it is recommended to keep the GO key pressed (in case a test is made under manual mode) until the result gets stable.
ATTENTION: When you take measurements among active conductors it is
essential to disconnect all the users (alarm lamps, intercom transformers, boilers etc) otherwise the instrument will measure their resistance instead of the installation insulation. Moreover any insulation resistance test among active conductors could damage them.
The indication "> 1999MΩ" or “o.r.” (out of range) warns that the insulation resistance measured by the instrument is higher than the maximum resistance limit (see technical specifications); this result is obviously far higher than the minimum limits of the above table therefore if during a test this symbol is displayed the insulation of that point is to be considered in compliance with standards.
Test voltage
(V)
500 ###0.500
Insulation resistance
(M###)
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