Amprobe DGC-1000A Manuel utilisateur
DGC-1000A
CLAMP-ON GROUND RESISTANCE TESTER
USERS MANUAL
HOLD
OFF
FUNC REC
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EN 61010-2-032
CAT III 300V, CAT II 600V
Pollution Degree 2
Definition of Symbols:
Caution: Refer to Accompanying Documents
Caution: Risk of Electric Shock
Double Insulation
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Table of Contents
I. WARNING...............................................................................................1
II. FEATURES DESCRIPTION ..................................................................1
III. PANEL DESCRIPTION.........................................................................2
IV. LCD DISPLAY.......................................................................................3
V. OPERATION INSTRUCTION ................................................................4
5-1. Ground Resistance Measurement ..................................................... 4
5-2. High and Low Alarm ( ) ............................................................... 7
5-3. Ground/Leakage Current Measurement ............................................ 9
5-4. Setting the Sampling Interval ........................................................... 10
5-5. Data Logging .................................................................................... 10
5-6. Read the Data Stored in Memory ..................................................... 11
5-7. Clear Data Memory .......................................................................... 11
5-8. Cancel the Auto Power Off ............................................................... 11
VI. PRINCIPLE OF OPERATION ............................................................11
VII. ELECTRICAL SPECIFICATION .......................................................14
VIII. GENERAL SPECIFICATIONS .........................................................15
IX. BATTERY REPLACEMENT...............................................................16
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1
I. 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 or ground wire away from the equipment being grounded.
5. All metal objects or wires connected to an electrical system should be
assumed to be lethal until tested. Grounding system is no
exception.
II. FEATURES DESCRIPTION
The clamp-on ground resistance tester enables the users to measure
ground resistance of a 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.
REC
FUNC
OFF
HOLD
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III. PANEL DESCRIPTION
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OFF
FUNC REC
1. Jaws Assembly: Enclose electrode or ground rod. No air gap is
allowed between two half jaws.
2. Hold Button: Press this button to freeze the value in LCD
3. Rotary Switch: Turn power on and select the desired 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 point.
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 select function of HI (hi alarm,)
LO (low alarm), SEC (seconds), or no.(read,).
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IV. LCD DISPLAY
1. Function 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
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 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 the 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 minutes.
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V. 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 closed a few times to let the jaws sit on the best
mating position.
3. Turn the power on, set the rotary switch at
position. Do not
clamp on to any conductor or open the jaws at this moment or
during self-calibration.
4. At power up, the clamp-on ground resistance tester will do the
self-calibration for better accuracy. Users should wait for
self-calibration to be complete. During the self-calibration, 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 closed a few times for better accuracy.
7. Read the value of Rg (ground resistance) from LCD.
Note: For better measurement,
1. Snap the jaws closed a few times before powering on.
2. Do not clamp on to any conductor at the moment of power up.
3. Snap the jaws closed a few times after clamping on to ground
electrode.
Note: If self-calibration does not stop,
1. That is because the self-calibration is not complete. Ground tester
will continue the process until a proper self-calibration is done.
2. Check the jaw mating surfaces. If there is any dirt, dust, or foreign
substance, clean the surfaces.
3. Do not open the jaws during self-calibration.
Note: Noise present in the electrode or ground rod.
If overly excessive current or 30V in ground rod exists, the symbol
“NOISE” will be displayed on the LCD. In the presence of noise, the
reading is no longer accurate.
Note: If jaw is open during measurement, a symbol of OPEN will be
displayed in LCD.
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HOLD
OFF
FUNC REC
RG 1
R2
R3
RN
...R
HOLD
OFF
FUNC REC
RG
1
RN
...R
R2
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HOLD
OFF
FUNC REC
RG
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5-2. High and Low Alarm ( )
1. Set the rotary switch to the position.
2. Press the FUNC button to select “HI“ or “LO” alarm. The current
value of High or Low alarm will be displayed on the upper row of the
LCD.
3. Press the ▲ button or ▼ button to increment/decrement the value
by 1 ohm. As users hold the button longer, the speed of
incrementing/decrementing will become faster. The value can be
increment from 0 ohm to 1510 ohm and then OL. Or the value can
be decrement from OL to 1510 ohm to o ohm. The value will roll
over to OL/0 if the current value is 0/OL.
4. Once the value is set, press the FUNC button several times until the
upper row of the LCD displays no letters.
5. When the rotary switch is set to the position. The unit will
compare the current value with the high and low alarm values. If the
current measurement is larger than the HI value, the unit will beep
and show HI -- 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.
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