Megger RCDT300 Series User manual

M
RCDT300 Series
Residual Current Device testers
USER MANUAL

GSAFETY WARNINGS
nSafety Warnings and Precautions must be read and understood before the instrument is used. They must be observed during use.
nContinuity of protective conductors and earthed equipotential bonding of new or modified installations must be verified before carrying out RCD tests.
nDo not leave the instrument connected to the mains supply when not in use.
nCircuit connections and exposed metalwork of an installation or equipment under test must not be touched.
nEnsure that hands remain behind guards of probes/clips when testing.
nDo not move the rotary selector knob position while a test is in progress.
nThe instrument should not be used if any part of it is damaged.
nTest leads, probes and crocodile clips must be in good order, clean and with no broken or cracked insulation.
nThe batterycover must be in place whilst conducting tests.
nVoltage indicator LED’s cannot reveal a N-PE supply reversal.
2
Users of this equipment and/or their employers are reminded that Health and Safety Legislation requires them to carry out valid risk assessments of all
electrical work so as to identify potential sources of electrical danger and risk of electrical injury such as inadvertent short circuits.
Some national safety authorities recommend fused leads for voltage measurement on high energy systems. If RCD or Loop tests are made it may cause the
fuse to rupture, and so they must be used with caution on voltage testing.
NOTE
THE INSTRUMENT MUST ONLY BE USED BY SUITABLY TRAINED AND COMPETENT PERSONS.

To replace batteries 17
Fuse blown indication 17
Preventive maintenance 19
Specification 19
Basic and service errors 20
Accessories and equipment 21
Repair and Warranty 22
Symbols used on the instrument are:
GCaution: refer to accompanying notes
tEquipment protected throughout by Double
Insulation (Class II)
cEquipment complies with current EU directives.
Equipment complies with ‘C tick’ requirements
CONTENTS
3
Safety warnings: 2
Introduction 4
General description 4
Case contents 5
LCD display 6
Top panel 6
Lid open/closure 7
Preparations for use 8
Batteries 8
Preliminary test lead check 8
General operating instructions 8
Display warning symbols 9
Setup procedure 9
Reverse polarity detection 9
Touch voltage 9
Test leads 10
Test lead connection. 10
LED indicators 11
Residual current device [RCD] testing 11
RCD type selection 12
1/2I RCD non-tripping measurement 12
1xI & 5xI RCD trip time measurement 12
0 or 180° testing 13
RampTest [RCDT320 and RCDT330 only] 13
DC sensitive RCD test 13
Auto RCD test (RCD320 and RCDT330 only) 13
Voltage measurement 14
Touch voltage 14
Frequency Hz (RCDT320 and RCDT330 only) 16
Replacing batteries and fuses 17
Low battery warning symbol 17
N1311

Feature RCDT310 RCDT320 RCDT330
3Phase safe nn n
Display backlight nn
Battery status indication nn n
Auto power down nn n
Fuse blown indication nn n
L-N-E polarity indicators nnn
Voltmeter n n n
Frequency measurement nn
Reverse polarity operation *
(can be disabled) nn n
1/2I, I, 5I RCD trip time test nn n
Auto sequence test nn
Max touch voltage selectable (25/50 V) nn n
RCD trip current test (RAMP) nn
0º/180º polarity selection nn n
Selective breakers nnn
*Not available on UK versions
INTRODUCTION GENERAL DESCRIPTION
4
Thank you for purchasing the Megger RCD Tester.
For your own safety and to get the maximum benefit from your
instrument, please ensure that you read and understand the following
safety warnings and instructions before attempting to use the instruments.
This user manual describes the operation and functions of the following
RCDT300 series of RCD testers:
RCDT310
RCDT320
RCDT330
The RCDT300 Series test instruments have
the following features:

Please complete the warranty card and return it to Megger Limited as soon
as possible to help us reduce any delays in supporting you should the
need arise.
Carton contents RCDT310, RCDT320 and RCDT330:
1xRCDT300 series RCD tester
1x2wire test lead with prods with clips (RCDT320, RCDT330 only)
8 x AA (LR6) batteries (fitted in instrument)
1 x Warranty card
1 x Calibration certificate
1xCD containing user manual
1xSafety instructions
1 x USB download lead (RCDDT330 only)
1 x Download manager CD (RCDT330 only)
1 x Printed quick startguide
1 x Mains plug test lead
CASE CONTENTS
5
Feature RCDT310 RCDT320 RCDT330
DC breakers (1/2 I, I, 5I) nnn
Programmable breakers n
30, 100, 300, 500 mA RCDs nn n
10 mA/1000 mA RCD nn
Plug ended test lead nn n
2wire test lead probe/croc clip ended nn
Calibration certificate nnn
IEC61010-1 300V CATIII n n n
EN61557 nn n
Results storage n
Downloading n
USB n

6
LCD DISPLAY FRONT PANEL
Refer to user
manual
Test lead
connections
Front panel
cover (folded
under cover)
Backlight
On/Off
(320/330)
RCD type
selector:
AC
AC selective
DC
DC selective
Test button
0º/180º
selector
Neck strap
slots
Supply connection
indicators
L-PE, L-N, N-PE
LCD display
RCD range select:
10 mA (320/330)
30 mA
100 mA
300 mA
500 mA
1000 mA (320/330)
Prog (330 only)
Test selector:
1/2 xI RCD trip time
1xI RCD trip time
5xI RCD trip time
AUTO (320/33)
Ramp (320/330)
V - AC RMS
Hz - Frequency
(320/330)
RCL, SND, DEL (330
only)
Mains noise
Battery
status
Ranges
Measured results
Touch voltage
bargraph
display
RCD test type
indicator
Fuse blown

Memory control keys:
STORE:.................... Store initiates the storing of a test result.
LAST/NEXT:............ Selects the type of location; ie Job,
distribution board, circuit, phase etc.
ESC:.........................Aborts a save at any time.
OK:.......................... Final operation to save the result.
sSelects the job, db, circuit number; ie
t01,02,03 etc
Lid open/closure
1. Open lid by lifting up front panel tab (1).
2. Fold-away underneath instrument (2 & 3) and push into retaining slot
(4).
Connection Panel
RCDT300 Series test lead connections
Additional RCDT330 Controls
7
Phase connection Earth connection
USB
connection
Max. 300 V
Phase to earth
Mains plug
test lead
connector
Max. 300 V
Phase to
earth
Warning!
Read user manual

PREPARATIONS FOR USE (ALL INSTRUMENTS) GENERAL OPERATING INSTRUCTIONS
8
Test inhibit
The following condition may cause the instrument to inhibit testing:
Out of range supply voltage
If an out of range voltage or frequency exists on the circuit under test,
or on a very noisy mains supply, testing will be automatically inhibited.
The RCD tests requires a minimum supply voltage to operate.
If the warning <***V is displayed, the supply voltage is below that
required to perform an RCD test.
*** = supply voltage indication.
Overheating
Repetitive RCD Ramp testing and some high current RCD trip testing
generates heat within the instrument. If this heat becomes excessive
the instrument will warn the operator by displaying the hot symbol,
and prevent further testing until the instrument has had a chance to
cool down.
Fuse Blown
Afuse blown will prevent the instrument from making further tests.
The fuse indicator will be displayed.
Default voltmeter
The default voltmeter automatically operates in all test modes, indicating
connection to a live system.
Auto power-down
To extend battery life the instrument will automatically switch off six
minutes after the last operation.
It can be switched off manually by selecting [OFF] with the rotary switch,
Batteries
The Megger RCDT300 series instruments are supplied with batteries fitted.
When batteries become exhausted, refer to page 17, battery replacement.
Warning: Do not switch the instrument on with the battery cover
removed.
Preliminary test lead check
Functional verification
Before each use of the instrument, visually inspect the test leads, prods
and crocodile clips to confirm that their condition is good, with no
damaged or broken insulation.

or switched back on again by pressing the [TEST] button.
Backlight operation (RCDT320 and RCDT330 only)
The RCDT320 and RCDT330 LCD display may be backlit. The backlight
function can be selected at any time while the instrument is switched on by
pressing the BACKLIGHT Jbutton.
The backlight function will switch off automatically 15 seconds after the
instrument has finished testing.
Display warning symbols
GRefer to user manual.
Any time the warning triangle is displayed the operator should refer to the
user manual for further information.
Battery condition indication. Refer to page 17.
fFuse blown indicator, appears when an instrument fuse has failed.
Refer to page 16.
>280V Indicates a supply voltage in excess of the allowed is present.
<50 V* Supply voltage too low/missing
hot Indicates the instrument needs to cool down before it can continue
RCD testing
*May vary depending on RCD test and instrument type.
Setup procedure
Note: Line reversal and RCD touch voltage configuration features are only
available on the instruments as per the relevant tables in the specification
section of this document.
Reverse polarity detection (not available on the UK version)
/Touch voltage setting
To select Polarity reversal acceptance or rejection:
1. With the instrument switched OFF, hold down the [TEST] button and
turn the range knob to any ON position.
2. Keep the button held down until the instrument displays the ‘SET’
warning.
3. Now release the [TEST] button.
4. Press the [TEST] button again to view the current setting for
line/neutral swapping.
5. The display shows ‘L+L’ (instrument will perform tests with L & N
swapped) or ‘L+N’ (instrument will not perform tests with L & N
swapped).
NOTE: LED’s will illuminate to indicate:-
L-PE ON = No reverse polarity
L-PE & N-PE ON = Reverse polarity allowed.
6. Press the [0/180º] button to change the setting.
7. Press the [TEST] button to go to the next item in the setup menu.
RCD touch voltage selection
To set the touch voltage inhibit limit:
1. With the instrument switched OFF, hold down the [TEST] button and
turn the range knob to any ON position.
2. Keep the button held down until the instrument displays the ‘SET’
warning.
9

10
Test lead connection
The supplied test leads should be connected to the appropriate sockets on
the rear of the instrument marked L0 and L1, or to the 3 way test socket.
Standard test probes and crocodile clips are supplied for connection to the
circuit under test with the RCDT320 only.
Application
This instrument may be connected live to earth or between live conductors
of systems that have a rated voltage of 300 V a.c. rms to earth and an
installation (overvoltage) Category III or lower.
This means that the instrument may be connected to any fixed wiring of a
building installation, but not to primary supply circuits such as overhead
cables. Tomaintain user safety and ensure accurate measurements, only use
the test leads supplied by Megger.
System diagram - Whereto use each test
3. Now release the [TEST] button.
4. Press the [TEST] button twice to view the current settings for the touch
voltage.
The display shows the fault voltage limit, ‘25 V’ or ‘50 V’.
If the fault-voltage display is active, a bar-graph display will also appear.
5. Press the [0º/180º] button to change the limit setting from 25V to 50V
and back.
6. Press the [TYPE] button to turn bar-graph display ON or OFF.
7. Press the [TEST] button to exit from the set-up menu.
Test leads
All test leads form part of the measuring circuit of the instrument and must
not be modified or changed in any way, or be used with any other electrical
instrument or appliance.
The colour code of the cord is:
Earth (Ground) Yellow/Green
Neutral Blue
Phase (Line) Brown
NOTE: Aplug severed from the power cord must be destroyed, as a plug
with bare conductors is hazardous in a live socket outlet.

LED indicators
Three RED led indicators show circuit connection status when correctly
connected to a live circuit. These are for indication purposes only and
should not be relied upon as a indication of the presence of a hazardous
voltage.
When connected to the circuit to be tested the three status LED’s will
show the following supply connection information:
LED Normal Reversed Notes
Indicator Supply (L-N) supply
=ON = OFF
L-PE Voltage between L- PE
greater than 25 V
L-N Voltage between L-N
greater than 25 V
N - PE Voltage between N-PE
greater than 25 V
Warning: Voltage indicator LED’s cannot reveal a N-PE supply reversal
Polarity Indication
If connected to a single phase power supply by a plug or by the 3-wire
lead set, three LED’s marked L-PE, N-PE and L-N respectively will indicate
supply polarity
RESIDUAL CURRENT DEVICE [RCD] TESTING
11
Method of measurement
The plug ended test lead or two wire lead should be used for these
measurements. A constant current source is connected across the supply
and the time taken for the supply to trip is measured by the instrument in
milliseconds (ms).
The RCDT310, RCDT320 and RCDT330 - can perform the following
RCD tests:
Type The RCD type is selectable from, AC, AC Selective, DC and
DC Selective.
1/2I Non-tripping test at half the rated RCD trip current for 2
seconds, during which the RCD should not trip.
ITripping test at the rated RCD trip current started on zero
crossing of the positive half cycle. The trip time will be
displayed
5I Tripping test at 5 x the rated RCD trip current. The trip time
will be displayed in milliseconds.
0or 180° Some RCDs are sensitive to the polarity of the supply, i.e
whether the test current is applied on the instantaneous
rising or falling part of the supply cycle. Tests should
therefore be performed at 0° and 180° and the maximum
time recorded.
Additionally the RCDT320 and RCDT330 can perform the
following tests:
AUTO Automatically steps through each RCD test (including 0 or
180°) whilst the operator stands by the RCD to reset it.
RampTest Used to check the trip current of an RCD.

Additionally the RCDT330 can perform the following tests:-
Programmable RCDs
Programmable RCDs can be tested from 10 mA to 1000 mA,
RCD type selection
To select the RCD type to be tested:
1. Set the top RCD selection knob (top knob) to the desired RCD current
range.
2. Set the RCD test knob (lower knob) to 1/2I, I or 5I as required.
3. Press the [TYPE] button to select the type of RCD under test:
Options are:
AC Standard (displays ‘AC’) (Default)
AC Selective (displays ‘AC.S’)
DC Sensitive (displays ‘dc’)
DC Selective (displays ‘dc.S’)
1/2IRCD (Non-tripping) measurement
To test the tripping time of the installed RCD under test:
Range selection:
1. Connect the mains plug test lead or 2-wire Red/Green test lead to the
instrument.
2. Plug in the mains plug test lead to the wall outlet, or the 2 wire test lead
across the RCD (refer to connection drawing, go to page 10).
3. Set the top RCD selection knob to the correct range for the RCD under
test.
4. Set the bottom range knob to [1/2I]. The RCD trip indicator will display
aclosed symbol .
12
5. Ensure the display shows the mains voltage.
6. Press the [TEST] button. The instrument should display >1999ms and
the RCD should NOT trip.
7. Refer to the application note on Touch Voltage at the end of this
section.
NOTE: If the RCD should trip while performing a 1/2I test the error
message ‘trP’will be displayed instead of the time display.
1xIRCD trip time measurement
To test the [1xI] trip time of the installed RCD:
1. Repeat the previous test for 1/2I, but with the bottom range knob set to
I. The RCD trip indicator will display an open symbol .
2. The instrument should display the RCD trip time in milliseconds.
If the display shows >300 ms the RCD has failed to trip in the appropriate
time. Check your test lead connections to the RCD and repeat the test.
If the RCD still fails to trip, suspect a faulty RCD.
Note: See also 0°/180° testing below.
The RCD test may abort with “>25 V” or “>50 V” depending on touch
voltage setting message if the loop resistance is so high that the test
cannot proceed.
5xIRCD trip time measurement
1. Repeat the previous test for 1/2I, but with the bottom range knob set to
5xI. The RCD trip indicator should display an open symbol .
2. The instrument should display the RCD trip time in milliseconds.
If the display shows >40 ms the RCD has failed to trip in the appropriate

time. Check your test lead connections to the RCD and repeat the test.
If the RCD still fails to trip, suspect a faulty RCD.
NOTE: The current limit for the 5I test is 100 mA, as the test current
available is limited to 1 Amp.
0° or 180° testing
Both the [I] and [5I] tests should be performed for 0° and 180°.
Repeat the I and 5I tests as above but with the instrument set to 180°.
0° or 180° is selected by pressing the [0°/180°] and the greatest trip time for
each test recorded.
RampTest (RCDT320 only) not programmable RCD
The RCD trip current is measured by applying a test current of half the
rated trip current and increasing this every 200 ms. When the RCD trips,
the current flowing is recorded and displayed in mA.
1. Select the appropriate RCD rated current on the top range knob.
2. Select the RAMP test on the lower range knob.
3. Press the [TEST] test button
4. The RCD should trip and the trip current will be is displayed.
5. If the RCD fails to trip, >***mA is displayed where *** mA indicates the
maximum RCD tripping current allowed and will varydepending on
range selected.
DC Sensitive RCD test [RCD ]
D.C. sensitive RCDs are tested as per standard RCDs. The RMS current
used is 2 x the rated operating current of the RCD.
13
As with the normal RCDs, these should be tested at 0° and 180°, or in the
case of DC sensitive RCD’s, positive and negative.
AUTO RCD test
AUTO test will run the 1/2I, I & 5I plus 0º and 180º tests automatically. The
operator can stand by the RCD to reset it when it trips on the I & 5I tests.
1. Connect to the circuit as per the 1/2I test above.
2. Select the RCD current rating on the top range knob.
3. Select the AUTO function on the lower range knob.
4. Press the TEST button to startthe test. The lock Lsymbol will flash
to indicate a AUTO test sequence is running.
5. The display will show ‘t1’ to ‘t5’ in the display to indicate which test
the instrument is running.
6. Reset the RCD each time it trips.
7. On completion of testing, results can recalled by pressing the
0º/180º button.
To indicate each test, segments of the bar graph are displayed as below:
none = 1/2I test
I=1xI test
IIIII =5Itest
Example shows 5I on 0º

14
Possible sources of error
Measurement results can be affected by the following:
1. Significant operating errors can occur if loads, particularly rotating
machinery and capacitive loads are left connected during tests.
2 A poor connection to the circuit under test.
VOLTAGE MEASUREMENT
NOTE: Measured voltage should not exceed 300 V phase to earth.
To measure the voltage of the electrical supply:
1. Set the instrument to the [V] range.
2. Connect the GREEN OR (L0) lead to the protective Earth (PE) and the
RED or (L1) lead to the phase to be measured. (Alternatively connect
the mains plug test lead to a suitable mains outlet).
3. The instrument will display the Phase to Earth voltage.
Touch Voltage
On all Megger RCDT300 series testers, the touch voltage is calculated at
the start of an RCD test to ensure it will remain below the safe 25 V or 50 V
limit as required by the application.
On the RCDT300 series instruments the touch voltage limit can be
switched from 50 V to 25 V as the application demands.
Should the touch voltage calculation identify a higher touch voltage than
that permitted, the RCD tester will stop the test, thus preventing the
presence of an unsafe voltage on the earth during the test, should the test
have taken place.
For those customers that require the touch voltage to be displayed, this
can be displayed by activating the analogue arc display, as described in the
instrument set-up procedure.
Once activated the touch voltage will be displayed on an RCD test, even if
the voltage is below the permitted limits.

TEST RESULT STORAGE (RCDT320 ONLY)
At the completion of the test press STORE.
2. Select Job reference number ( 000, 001 etc) using ↑↓
keys then press NEXT.
(Hold the key down to scroll quickly through the numbers)
3. Select distribution board number (b01,02 etc) using ↑↓ keys then
press NEXT
4. Select circuit number (c01,02 etc) using ↑↓ keys then press NEXT
5. Circuit type is fixed at L-E, press NEXT
6. Select the Phase using ↑↓ keys then press NEXT. The screen will
display a unique test number, which is attached to that particular test.
7. Press OK to save the result or ESCto abort.
Storing a subsequent result:
To save the next test under the same location job number, distribution
board etc:
1. Make another measurement as described earlier and press STORE.
2. The last Job number will be displayed. Press OK.
3. The unique test number will be displayed. Press OK and the result is
stored.
NOTE: Tochange any setting before saving a result, scroll down through
the result using the NEXT/LAST keys. Change the reference number using
the ↑↓ keys and press OK twice to store result.
To recall the last test result:
1. Set the range knob to RCL
2. The last unique test number is displayed
How results are stored:
Results storage has the following structure:
000, 255 = Job number
b01,b02… = Distribution board No.
c01, c02… = Circuit number
L-E =Circuit type (L-E only)
P1 to P3 = Phase
Job number ( 000, 001…) acts as work folders. Sets of results
can be saved to a particular job number and easily separated when
downloaded.
b01, b02… Distribution board number:
c01, c02… Circuit reference
Results can be assigned a specific distribution board number and circuit
reference number.
L-E Test type: defines the circuit type (only L-E available on
RCDT).
P1,P2,P3 Phase number: Each test can be stored under a particular
phase, P1, P2 or P3.
Unique test number: Each test result is assigned a unique test number,
from 0 to 1999 logged automatically. This cannot be changed by the user.
To store a result:
1. Select an RCD test mode and make a measurement as described
earlier.
15

To measure the frequency of the electrical supply:
1. Set the instrument to the [Hz] range.
2. Connect the GREEN or (L0) lead to the protective earth (PE) and the
RED or (L1) lead to the phase to be measured.
3. The instrument will display the frequency in Hz.
16
FREQUENCY HZ (RCDT320 ONLY)
3. Press OK and the test result will be displayed.
Press the LAST or NEXT to scroll through all test parameters if applicable.
NOTE: Only the last test result can be recalled to the display.
Downloading results to a PC
1. Connect the tester to teh PC using the USB test lead.
2. Set the tester range knob to [Snd].
3. Run Megger PowerSuite Professional or Megger Download Manager on
the PC.
4. Select “Download from tester”.
5. The test data will automatically download its contents to the PC.
A bar graph shows the status of the download.
Deleting test results
To delete the latest test result;
1. Set the range knob to [dEL]. The display will flash "dEL" followed by
the test number to be deleted.
2. Press the OK button. The last test result will be will be deleted.
WARNING: This operation is not reversible.
To delete all test data:
1. Set the range knob to [dEL]. The display will flash "dEL".
2. Press the NEXT or LAST key. The display will flash "ALL".
3. Press the OK button. All the test results will be deleted.
Abar graph shows the progress of the deletion.
WARNING: This operation is not reversible. All data will be deleted.

Auto power-down
To extend battery life the instrument will automatically switch off 6
minutes after the last operation.
The instrument can be switch off manually be selecting [OFF] on the
rotary switch, or switched back on by pressing the [TEST] button.
Fuse Blown indication
The fuse blown symbol findicates that an internal fuse has failed. This
instrument is fitted with a factory fitted fuse and should only be replaced
by an authorised Megger repairer.
Contact your Megger distributor
or call Megger Limited on 01304 502 102.
Messages for information and warnings
RCD test types
AC AC type
AC.S ACselective RCD
DC DC type RCD
DC.S DC selective RCD
Warnings
trp Unexpected disconnection
hot Overheated instrument
chk Check test lead connections
noS Noise
>50V Touch voltage exceeded (for 50V settings)
>25V Touch voltage exceeded (for 25V setting)
<***V Insufficient supply voltage for test
17
REPLACING BATTERIES AND FUSES
Batteries
Battery type: 8xLR6 (AA), 1.5 V Alkaline, or 8 x 1.2V NiCAD, or
8 x 1.2V NiMH
Low battery warning symbol
The battery condition is continuously displayed by the symbol .
When the batteries are exhausted, symbol will show
and testing is inhibited.
If symbol appears as less than fully charged with new batteries, check for
correct polarity.
NOTE: Fully charged NiMH or NiCAD rechargeable batteries show a lower
charge than Alkaline batteries, and may not give much warning before
becoming exhausted.
To replace batteries
Warning: Do not switch the instrument on with the battery cover
removed.
1. Switch off the instrument and disconnect (the instrument) from any
electrical circuits.
2. The rear cover must not be opened if the test leads are connected.
3. To remove the rear cover release the screw at the bottom of the
cover and lift the cover upwards.
4. Refit new batteries observing the correct polarity as marked on the
battery compartment.
5. Replace the cover.
NOTE: Battery cells should not be left in an instrument, which may
remain unused for extended periods.

Other messages
L+L Will test with L/N swapped
L+N Will NOT test with L/N swapped
SEt Setup menu
OFF Instrumnet is about to switch off
18
PREVENTATIVE MAINTENANCE
Clean only with a damp cloth. Do not use any alcohol based cleaning fluids
as they may leave a residue.

SPECIFICATION
RCD Test Ranges (to EN61557-6)
Supply
RCDT310 100 V - 280 V 45Hz to 65 Hz
RCDT320 50 V - 280 V 45Hz to 65 Hz
RCDT330 50 V - 280 V 45 Hz to 65 Hz
Minimum voltage 71 V for 300 mA RCDs, 100 V for 500 mA RCDs and 205 V
for 1000 mA RCDs
Ranges
RCDT310 30 mA, 100 mA, 300 mA, 500 mA
RCDT320/330 10 mA, 30 mA, 100 mA, 300 mA, 500 mA, 1000 mA
Test current accuracy:
No trip test: (1/2I) –8% to –2%
Trip test: (I, 5I) +2% to +8%
Trip time: ±1% ±1ms
Ramp test
Test current range:
1/2 RCD rated current to a nominal 110% Rated current
Step duration: 200 ms
Programmable RCD
RCDT330 only 10 mA to 1000 mA
Voltage measurement (All Models)
Range ac: 0V-500 V 25Hz to 450Hz
Accuracy: ±2% ±2 digits
Frequency measurement
(RCDT320 and RCDT330 only)
Range: 25Hz to 450Hz
Accuracy: 25.0Hz to 199.9Hz ±0.1Hz
200Hz to 450Hz ±1Hz
Fault (touch) voltage (25 V or 50 V)
Displayed range: 0Vto 50 V (displayed on the analogue bar graph)
Error: +5%/+15% ±0.5 V
Temperature and humidity
Operating range: -5°C to +40°C
Operating humidity: 93% R.H. at +40°Cmax.
Storage range: -25°C to +70°C
Maximum altitude: 2000m
Environmental protection: Weather proof to IP54
Safety
Meets the requirements of IEC61010-1 Cat III 300 V phase to earth.
IEC61557
Complies with the following parts of EN61557, Electrical safety in low
voltage systems up to 1000 V a.c. and 1500 V d.c. - Equipment for testing,
measuring or monitoring of protective measures:
Part1 - General Requirements
Part4 - Residual current devices
19

20
BASIC AND SERVICE ERRORS
Power supply
Batteries: 8x1,5 V cells IEC LR6 type (AA alkaline).
Rechargeable: 8x1.2 V NiCd or NiMH cells may be used.
Battery condition is constantly shown on the display as a four-section bar
graph.
Battery Life: 2000 consecutive tests
Weight
All units 980gms
Dimensions
All units 203 x 148 x 78 mm
E.M.C
In accordance with IEC61326-1
Operational inaccuracies: Ref to www.megger.com
Basic and service errors Loop test ranges
Basic and service errors for RCD test ranges ranges.
The basic error is the maximum inaccuracy of the instrument under ideal
conditions, whereas the service error is the maximum inaccuracy taking into
effect of battery voltage, temperature, interference, and system voltage and
frequency, where applicable.