Amprobe DGC-1000A Operating Manual

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DGC-1000A

CLAMP-ON GROUND RESISTANCE TESTER

USERS MANUAL

EN 61010-2-032 CAT III 300V, CAT II 600V Pollution Degree 2

Caution: Refer to Accompanying Documents

Caution: Risk of Electric Shock

Double Insulation

Definition of Symbols:

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

I. WARNING

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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.

III. PANEL DESCRIPTION

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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,).

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

6. NOISE: When ground resistance tester senses noise in the

7. Jaw Open When the jaw is open during measurement, this symbol

8. Low Battery When the battery voltage is lower than required, this

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

This symbol will be shown if the rotary switch is set at the

alarm position.

ground electrode or ground rod, this symbol will be shown in LCD

and the word OPEN will be shown in LCD.

symbol will be shown in LCD.

will be turned off in 4 to 6 minutes.

V. OPERATION INSTRUCTION

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.

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.

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