User manual | Manual - Meco Instruments P.Ltd

®
EN 61010-2-032
CAT II 600V
CAT III 300V
Pollution Degree 2
Definition of Symbols :
Caution : Refer to Accompanying Documents
Caution : Risk of Electric Shock
Double Insulation
Over-voltage Category I (CAT I) :
Equipment for connection to circuits in which measures are taken
to limit the transient over-voltages to an appropriate low level.
Over-voltage Category II (CAT II) :
Energy-consuming equipment to be supplied from the fixed
installation.
CLAMP ON
GROUND/EARTH
RESISTANCE
TESTER
MODEL : 4680/
4680B
Over-voltage Category III (CAT III) :
Equipment in fixed installations.
WARNING :
If the clamp meter is used in a manner Not specified by
the manufacturer, the protection provided by the clamp
meter may be impaired.
If jaws are damaged in any way, please stop operating
this clamp, and return it to qualified personnel for repair.
USER MANUAL
1
TABLE OF CONTENTS
1.
WARNING ......................................................................... 4
2.
FEATURES OF DESCRIPTION ...................................... 4
3.
PANEL DESCRIPTION ..................................................... 5
4.
LCD DISPLAY ................................................................... 6
5.
OPERATION INSTRUCTION .......................................... 7
5-1. Ground Resistance Measurement ......................... 9
5-2. High and Low Alarm ............................................... 10
5-3. Ground/Leakage Current Measurement .............. 12
5-4. Setting the Sampling Interval ................................. 13
5-5. Data Logging .......................................................... 13
5-6. Read the Data Stored in Memory ......................... 14
5-7. Clear Data Memory ............................................... 14
2
1. WARNING
1. Use of rubber gloves is a good safety practice even if the
equipment is properly operated and grounded.
2. Safety is the responsibility of the operator.
3. Use extreme caution when using the instrument around
energized electrical equipment.
4. Do not attempt to use the ground tester to twist or pry the
ground electrode ar ground wire away from the equipment
being grounded.
5. All metal objects or wires connected to the electrical
system should be assumed to be lethal until tested.
Grounding system is no exception.
2. FEATURES DESCRIPTION
The clamp-on ground resistance tester enable the users to
measure ground resistance of ground rod without the use of
auxiliary ground rods. Clamp-on ground resistance tester is
used in multi-grounded systems without disconnecting the
ground under test.
5-8. Cancel the Auto Power Off .................................... 14
6.
PRINCIPLE OF OPERATION ........................................ 15
7.
ELECTRICAL SPECIFICATION ..................................... 16
8.
GENERAL SPECIFICATIONS ........................................ 18
9.
BATTERY REPLACEMENT ............................................ 19
10. MAINTENANCE AND CLEANING ................................. 00
3
4
4680B : 28-09-2012
3. PANEL DESCRIPTION
4. LCD DISPLAY
1. Function
5
1. Jaws Assembly : Enclose electrode or ground rod. No air
gap is ailowed between two half jaws.
2. Hold Button: Press this button to hold the value in LCD.
3. Rotary Switch : Turn power on and select function.
4. LCD
5. REC button : When one of the functions is selected by
FUNC button, it is used to increment value. If no function
is selected, it is used to start data logging, or record one
data.
6.  button : To decrement value, press this Button
7. Jaws Trigger
8.  button : To increment value, press this button
9. FUNC button : Press this button to se/ect function of HI
(high alarm,) LO (low alarm), SEC (seconds) or no. (read).
5. OPERATION INSTRUCTION
5-1. Ground Resistance Measurement :
1. Open the jaws and make sure the jaws mating surfaces
are clean and free of dust, dirt or any foreign substance.
2. Snap the jaws few times to let the jaws sit on the best
mating position
3. Turn the power on, set the rotary switch at V position. Do
not clamp on to any conductor or open the jaws at
this moment or during self-calibration.
: Display current selected function or current
record number.
2. Digits
: Display value from 0 to 9999 with decimal
point.
3. Ohm
: Symbol will be shown in V and alarm
functions.
4. mA
: Display ground leakage current in mA or A
5.
: This symbol will be shown if the rotary switch
is set at the alarm position.
6. NOISE
: When ground resistance tester senses noise
existed in the ground electrode or ground rod,
this symbol will be shown in LCD.
7. Jaw Open : When the jaw is open during measurement,
this symbol and word OPEN will be shown in
LCD.
8. Low Battery : When the battery voltage is lower than
required this symbol will be shown in LCD.
9. NO.
: Indicate the READ function.
10. REC
: Indicate data logging is in progress.
11. AP
: If this symbol is displayed in LCD, that
means the unit will be turned off in 4 to 6
6
minutes.
3. Do not open the jaws during self-caiibratian.
Note : Noise present in the electrode or ground rod.
If there exists over excessive current or 30V in ground rod,
a symbol of NOISE will be shown in LCD. Under the pres
ence of noise the reading is no longer accurate.
Note :
If jaw is open during measurement, a symbol of OPEN will
be displayed in LCD.
4. At powering on, clamp-on ground resistance tester will do
the self-calibration for better accuracy. Users should wait
for self-calibration to be complete. During the selfcaiibration, LCD will show CAL5, CAL4, CAL 3, CAL2 and
CAL1.
5. When the ground tester is ready, a beep sound will be
heard.
6. Clamp on to the electrode or ground rod to be measured.
Snap the jaws few times for better accuracy.
7. Read the value of Rg (ground resistance) from LCD.
Note : For better measurement,
1. Must snap the jaws few times before powering on.
2. Do not clamp on to any conductor at the moment of
powering on.
3. Snap the jaws few times after clamping on to ground
electrode.
Note : If self-calibration does not stop,
1. That is because the self-caiibration is not complete Ground
tester will continue the process until a proper self-caiibration
is done.
7
2. Check the jaw mating surfaces. If there is any dirt, dust or
any foreign substance, clean the surface.
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4680B : 28-09-2012
5-2. High and Low alarm (
)
1. Set the rotary switch at the
position.
2. Press the FUNC button to select “Hl” or “LO” alarm. The
current value of High or Low alarm will be shown in the
upper row of LCD
3. Press the  or  button to increment or decrement the
value by 1 ohm. As users hold the button longer, the speed
of incrementing or decrementing will become faster. The
value can be increment from 0 ohm to 1510 ohm and then
OL. The value will roll over to 0 if the current value shows
OL.
4. Once the value is set, press the FUNC button several times
until the upper row LCD show no letters.
position. The unit
5. When the rotary switch is set at the
will compare the current value with the high and low
values. If the current measurement is larger than Hl value,
the unit will beep and show Hl in the upper row of LCD.
If the current measurement is smaller than the LO value,
the unit will beep and show LO in the upper row of LCD.
9
10
5-3. Ground/Leakage Current Measurement
1. Turn the power on and set the rotary switch at the mA or
A position.
2. Clamp on to the electrode or ground rod.
3. Read the value of leakage current displayed in LCD.
NOTE :
If the HI value is set at OL, or the LO value is set at 0, the
ALARM function will not be performed. So they are method to
disable one of the Hl or LO alarm.
NOTE :
The Hl value can’t be smaller than the low value. And
the LO value can’t be larger than the Hl value. Hl value will be
adjusted to LO value plus 1 when roll-over occurs. The maximum
value of LO value is Hl value minus 1.
NOTE :
If data logging is progressing, sound of beeping will
be disabled to save battery power. But the LCD still shows the
warning letters of “Hl –” or “LO – ”.
NOTE :
The values for the high and low alarm are stored in the memory.
They are restored when the power is turned on.
11
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4680B : 28-09-2012
5-4. Setting the Sampling Interval
1. Press the FUNC button until letters of “SEC” are shown
in the upper row of LCD.
2. The unit shows the current sampling interval in seconds.
3. Press the  or  button to increment / decrement the
value by 1 second. As users hold the button longer, the
speed of incrementing / decrementing will become
faster. The value can be incremented /decremented from
0 to 255 / 255 to 0 seconds. Value will roll over when the
value of maximum 255 / minimum 0 seconds is reached.
4. Press the FUNC button several times until the upper row
LCD show no letters.
5-6. Read the Data Stored in Memory
This function allows users to read the stored data at site if no
PC is available.
1. Press the FUNC button until a symbol oi “NO.” is shown
in LCD. The current record number is shown in the upper
row of LCD. And the data is shown in the lower row of
LCD.
2. Press the  or  button to read the next or previous
data,
3. If the users hold the  or  button longer, the record
number will be incremented / decremented faster. The
record number will roll over when the last / first record is
reached.
5-7. Clear Data Memory
Press and hold the REC button, then turn the power on.
Letters of “CL” will be shown to indicate that memory is
cleared.
NOTE : The sampling interval is used for data logging.
5-5. Data Logging
The unit will start data logging if the REC button is pressed,
and a symbol of REC will be shown in LCD. Data will be
recorded at the specified sampling interval. Data logging will
be stopped if the memory is full, or the unit detects the condition
of low battery, or the REC button is pressed again.
NOTE : If the sampling interval is set at 0 seconds, only one data
is recorded. To record next data, users can press the REC button
again. The record number is also displayed for about 1 seconds.
5-8. Cancel the Auto Power Off
When the unit is turned on, a symbol of AP is displayed in
LCD. That means the unit will turn itself off in about 4 to 6
minutes. To cancel this function, user can hold the FUNC
button, then turn the power on. Symbol of AP will not be
displayed in LCD.
14
6. PRINCIPLE OF OPERATION
Below is a simplified typical ground distribution system. Its
equivalent circuit is shown in Figure A. If R1, R2, R3, ... Rn is
combined as Req then only Rg and Req are left in the circuit (refer
to Figure B). If a constant voltage is applied to the circuit, following
equation will be constructed.
V
= Rg+ Req
I
where
Req =
1
, i = 1, 2, ......, n
1
S Ri
if Rg and R1, R2, ... Rn are about the same, and n is a large number
(such as 200), then Req will be much less than Rg and may be
approach zero.
Rg >> Req (Req0)
Example : If Rg and R1, R2, ... Rn are all 10 V, respectively and
n = 200. Then Req by calculation equals
Req =
1
1
10
V
I
+
1
10
+...+
= 0.05 V
1
10
= Rg + Req = 10 + 0.05 = 10. 05 -- > Rg
In this example, we can see that as long as the number of multiple
electrodes is large enough, the equivalent resistance is negligible
with respect to the ground resistance to be measured.
16
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4680B : 28-09-2012
7. ELECTRICAL SPECIFICATION
Ground/Leakage Current
Ground Resistance (Auto range) :
Resolution
Accuracy of Reading1,2
0.025 - 0.250 V
0.002 V
± 1.5% ± 0.05 V
Range
Resolution
Accuracy of Reading
± 1.5% ± 0.05 V
0.300 - 1.000 mA
0.001 mA
± 2.0% ± 0.05 mA
0.01 mA
± 2.0% ± 0.03 mA
± 2.0% ± 0.3 mA
0.251 - 1.000 V
0.02 V
1.001 - 10.00 V
0.02 V
± 1.5% ± 0.1 V
1.00 - 10.00 mA
10.01 - 50.00 V
0.04 V
± 2.0% ± 0.3 V
10.0 - 100.0 mA
0.1 mA
50.01 - 100.0 V
0.04 V
± 2.0% ± 0.5 V
100 - 1000 mA
1 mA
± 2.0% ± 3 mA
100.1 - 200.0 V
0.4 V
± 3.0% ± 1.0 V
0.200 - 4.000 A
0.001 A
± 2.0% ± 0.03 A
200.1 - 400.0 V
2V
± 5.0% ± 5 V
4.00 - 30.00 A (4680)
0.01 A
± 3.0% ± 0.03 A
4.00 - 35.00 A (4680B)
0.01 A
± 3.0% ± 0.03 A
400.1 - 600.0 V
5V
± 10% ± 10 V
600.1 - 1500 V
20 V
± 20%
Loop resistance noninductive, external field < 50 A/m (4680)
or < 200 A/m (4680B), external electrical field < 1 V/m,
conductor centered.
1
2
Auto range, 50/60 Hz, TRMS, Crest Factor < 3.0 for (4680) or
< 3.5 for (4680B)
Range
Accuracy of Resiatance Calibration Plate : ± 1%
Data Logging Capacity : 116 records
Data Logging Interval : 1 to 255 seconds
Resistance Measurement Frequency : 3.333KHz
High and Low Alarm
Range
Resolution
High Alarm
0 - 1510 V
1V
Lo Alarm
0 - 1510 V
1V
17
8. GENERAL SPECIFICATIONS
Conductor Size
: 23 mm approx. (4680)
35 mm approx. (4680B)
Jaw Opening
: 27 mm approx. (4680)
38 mm approx. (4680B)
Battery Type
: 9V IEC 6 LR61 (Alkaline)
Display Type
: 4 digits 9999 counts LCD
Range Selection
: Auto
Auto Power Off
: About 4 to 6 minutes
Overload Protection
: 100A (continuous), 200A (5 sec.)
Overload Indication
: OL
Power Consumption : 40mA (approx.)
Low Battery Indication : B
Battery Life
: 3000 measurements
Temperature coefficient : 0.1% x (specified spec.) / 0C
(<180C or >280C)
Sampling Time
: 0.5 seconds
Operating Temperature : 00C to 500C (140F to 1220F)
Operating Humidity
: Less than 85% RH
Storage Temperature : -20 0C to 600C (-40F to 1220F)
Storage Humidity
: Less than 75% RH
Dimension
: 257 x 100 x 47mm (approx.) (4680)
276 x 100 x 47mm (approx.) (4680B)
Weight
: 640gms including battery (approx.)
(4680)
750gms including battery (approx.)
(4680B)
Accessaries
: Resistance Calibration Plate x 1
9V Battery Installed x 1
Instruction Manual x 1
Carrying Box x 1
Cleaning Brush x 1
19
18
9. Battery Replacement
When the low battery symbol is displayed in LCD, replace the
old battery with new battery.
1. Turn the power off.
2. Remove the screw of the back cover.
3. Lift and remove the back cover.
4. Remove the old battery.
5. Install a new 9V battery.
6. Place the back cover and secure the screw.
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4680B : 28-09-2012
10. Maintenance & Cleaning
Servicing not covered in this manual should only be performed
by qualified personnel. Repairs should only be performed by
qualified personnel.
Periodically wipe the case with a damp cloth and detergent;
do not use abrasives or solvents.
®
Certificate of Calibration
We hereby certify that this product has been
calibrated and found to be in accordance
with the applicable SPECIFICATIONS and
STANDARDS.
Accuracies of the standard equipment used in
this calibration are traceable to the National
Standards.
MECO METERS PVT. LTD.
Plot No. EL-60, MIDC Electronic Zone, TTC Industrial
Area, Mahape, Navi Mumbai - 400710 (INDIA)
Tel : 0091-22-27673311-16, 27673300 (Board)
Fax : 0091-22-27673310, 27673330
E-mail : [email protected]
Web : www.mecoinst.com
SR. NO.
:
CHECKED BY :
21
DATE
:
MODEL NO.
:
4680B : 28-09-2012

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