Megger DET10C, DET20C User Manual
M
DET10C and DET20C
Clamp on Ground Resistance
Tester
User Manual
G SAFETY WARNINGS
■
Use of rubber gloves is good safety practice even if the equipment is properly operated and
grounded.
■
Safety is the responsibility of the operator.
■
Use extreme caution when using the instrument around energised electrical equipment.
■
Do not attempt to use the ground tester to twist or pry the ground electrode or ground wire away
from the equipment being grounded.
■
All metal objects or wires connected to the electrical system should be assumed to be lethal until
tested, the grounding system is no exception.
Symbols used on the instrument are:
F Caution: Risk of Electric Shock
G Caution: refer to accompanying notes
t Equipment protected throughout by Double Insulation (Class II)
c EN 61010-2-032 CAT III 300V, CAT II 600V Pollution Degree 2
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CONTENTS
SAFETY WARNINGS 1
FEATURES DESCRIPTION 3
CONTROLS DESCRIPTION 4
LIQUID CRYSTAL DISPLAY 5
OPERATING INSTRUCTIONS 6
Ground Resistance Measurement 6
High and Low Alarm ( ) 8
Ground/Leakage Current Measurement 8
Setting the Sampling Interval 8
Data Logging 8
Downloading Data to a PC (DET20C only) 8
Format of Down Loaded Data (DET20C only) 9
Reading the Data Stored in Memory 9
Clearing the Data Memory 9
Enable RS-232C output (DET20C only) 10
Installation of Megger Download Manager Software 10
Description of Megger Download Manager Software 10
PRINCIPLE OF OPERATION 11
ELECTRICAL SPECIFICATION 13
GENERAL SPECIFICATIONS 14
ACCESSORIES 14
BATTERY REPLACEMENT 15
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FEATURES DESCRIPTION
The clamp-on ground resistance tester enables the user to measure the ground resistance of a ground
rod without the use of auxiliary ground rods. The clamp-on ground resistance tester is used in multigrounded systems without disconnecting the ground under test.
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FEATURES DESCRIPTION
1. Jaws Assembly:
Encircle electrode or ground rod. No air gap is allowed between the two jaw halves.
2. Hold Button:
Maintains last measurement on display
3. Rotary Switch:
Power on and function selection.
4. LCD panel
5. "REC
▲"button:
Function dependant on mode. Starts either data logging, single measurement recording, or data
download to PC. Also used to increment a value in conjunction with FUNC button.
6. FUNC button:
Press to select "HI" (high alarm), "LO" (low alarm), "SEC" (recording interval), "dL" (Data down
load), "no" (Read Data) or "232" (RS-232C)
7. Jaws opening lever
8. Battery cover
9. RS-232C interface connection point (DET20C only)
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9
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LIQUID CRYSTAL DISPLAY
1. Function Display current selected function or current record number.
2. Digits Display value from 0 to 9999 with decimal point.
3. Ohm Indicates resistance mode and alarm functions.
4. mA Indicates ground leakage current mode in mA or A
5. Indicates instrument is set at the alarm position.
6. NOISE: Indicates ground resistance tester senses noise or excessive
current present in the ground electrode
7. Jaw Open Displayed if the jaws are opened during the measurement,
this symbol and word OPEN will be shown in LCD.
8. Low Battery Indicates battery voltage is lower than required.
9. NO. Indicates the data record number in memory.
10. REC Indicates data logging is in progress.
11. H Indicates "HOLD" function activated
12. AP Indicates Auto Power Off activated. Deactivate by holding
down the REC button then turning on unit.
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