Megger DET10C Manual de usuario
M
DET10C and DET20C
Clamp on Ground Resistance
Tester
User Manual
GSAFETY 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:
FCaution: Risk of Electric Shock
GCaution: refer to accompanying notes
tEquipment protected throughout by Double Insulation (Class II)
cEN 61010-2-032 CAT III 300V, CAT II 600V Pollution Degree 2
1
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
2
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 multi-
grounded systems without disconnecting the ground under test.
3
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)
4
1
2
3
4
5
6
79
8
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.
5
OPERATING INSTRUCTIONS
Ground Resistance Measurement
1. Open the jaws and make sure that the mating surfaces are clean and free of dust, dirt or any
foreign substance.
2. Snap the jaws a few times to ensure clean contact is made.
3. Turn the rotary switch to the Ωposition to power the instrument on. Do not clamp on to any
conductor or open the jaws, as this is a self-calibration phase.
4. At power on in _ mode, the instrument will perform a self-calibration for optimum accuracy. Users
must wait for self-calibration to be complete before use. During the self-calibration phase, the
LCD will show CAL7, CAL6, CAL5, CAL4, CAL 3, CAL2, and CAL1.
5. When the ground tester is ready, a beep will be heard.
6. Place the clamp around the electrode or ground rod to be measured. Operate the jaws a few
times for better accuracy.
7. Read the value of Rg (ground resistance) from LCD.
NOTE: For better measurement:
1. Operate the jaws a few times before powering on to clear mating surfaces.
2. Do not clamp on to any conductor during power up (point 3 above).
3. Operate the jaws a few times after clamping around the ground electrode.
NOTE: If self-calibration does not complete (The instrument will continue the process until a
successful self-calibration is achieved):
1. Check the jaw mating surfaces. If there is any dirt, dust, or any foreign substance, clean the
surfaces.
2. Ensure the jaws are not open during self-calibration.
NOTE: Noise present in the electrode or ground rod.
If there is excessive current or over 30V noise in the ground rod, a symbol of "NOISE" will be shown
in LCD. Under these conditions, the reading is no longer accurate. We recommend the current flow is
measured before a resistance reading is taken.
NOTE: If jaws are opened during a measurement, a symbol of "OPEN" will be displayed on the LCD.
High and Low Alarm ( )
1. Set the rotary switch to the position.
2. Press the FUNC button to select "HI" or "LO" alarm. The present value of High or Low alarm will
be shown in the lower row of the LCD.
3. Press the ▲button to increment the value by 1 ohm. If the button is held down, the rate of
increment accelerates. The value can be set from 0 ohm to 1550 ohm and then OL. The value will
roll over to 1(HI) or 0 (LO) if the set value in incremented past OL.
4. Once the value is set, press the FUNC button several times until the upper row LCD does not show
any letters. 6
5. When the rotary switch is set at the position the instrument will compare the measured
value with the high and low values. If the measurement is higher than the HI value, the unit will
beep and show "HI --" in the upper row of LCD. If the current measurement is lower than the
LO value, the unit will beep and show "LO-- " in the upper row of LCD.
NOTE: If the HI value is set at OL, or the LO value is set at 0, the ALARM function is disabled. The
HI or LO value can be disabled individually
NOTE: The HI value cannot be lower than the LO value. Similarly the LO value cannot be higher
than the HI value. HI value will be adjusted to LO value plus 1 if roll-over occurs. The maximum
value of LO value is HI value minus 1.
NOTE: If data logging is in progress, the beeper will be disabled to save battery power. However,
the LCD displays the warning letters of "HI—" or "LO—" if an alarm condition occurs
NOTE: The values for the high and low alarm are stored in the memory. The values will be active
when the unit is powered on and alarm mode selected.
7
Ground/Leakage Current Measurement
1. Set the rotary switch to the mA or A position.
2. Place the clamp around the electrode or ground rod to be measured.
3. Read the value of leakage current displayed on the LCD.
Setting the Sampling Interval
1. Press the FUNC button until the letters "SEC" are shown on the upper row of LCD.
2. The unit shows the current sampling interval in seconds.
3. Press the ▲button to increment the value by 1 second. If the button is held down, the rate of
increment accelerates. The value can be set from 0 to 255 seconds. The set value will roll over to 0
when the maximum value of 255 seconds is reached.
4. Press the FUNC button several times until the upper row LCD does not show any symbols.
NOTE: The sampling interval is used for data logging and RS-232C output timing.
Data Logging
The unit will start data logging if the "REC ▲" button is pressed, and the symbol "REC" will be shown
on the LCD. Data will be recorded at the specified sampling interval. Data logging will be stopped if
the memory is full, or the unit detects a low battery condition, or the "REC ▲" button is pressed
again.
NOTE: With sampling time greater than zero the Auto Power Off feature is disabled in this mode
NOTE: If the sampling interval is set at 0 seconds, one set of data is recorded. To record the next set
of data, press the "REC ▲" button again. The record number and "REC" symbol is displayed for
approximately 1 second.
Downloading Data to a PC (ASCII format)(DET20C only)
1. Connect the RS-232C cable to the unit and a PC.
2. Run any application software which can accept ASCII data.
3. Press the FUNC button until the symbol "dL" is shown in the upper row on the LCD. The number
of records in the memory is shown in the lower row on the LCD.
4. Press the "REC ▲" button to down load all the data stored in the memory. The symbol " -- " is
shown next to the symbol "dL" when data is transferring to PC in ASCII format.
5. The process of down loading can only be halted by turning the instrument off.
8
6. To exit this function, press the FUNC button several times until the upper row LCD shows no
symbols.
NOTE: The unit first sends the sampling time, then the rest of the data stored in memory is sent to
the PC.
Format of Down Loaded Data (DET20C only)
The data is down loaded to the PC in ASCII format. In addition to data readings information includes
status of jaws open, noise, HI alarm, LO alarm, and low battery. Below is a list of abbreviations for
each condition and an example of data down loaded to the PC:
List of abbreviations:
Abbreviation Abbreviation Abbreviation
OPEN Jaws open NS Noise HI Hi alarm
LO Low alarm HD Data Hold LB Battery low
Example of down loaded data:
0001 (sampling time)
10.00 ohm
10.02 ohm
5.200 ohm LO
1.000 ohm NS
1.500 mA
9.00 A
NOTE: Each record is ended by <CR> and <LF>. The corresponding ASCII codes for <CR> and <LF>
are 13 and 10.
Reading the Data Stored in Memory
This function allows users to read the data stored directly from the instrument display.
1. Press the FUNC button until the symbol "NO." is shown on the LCD. The current record number is
shown on the upper row of the LCD, the data is shown in the lower row of LCD.
2. Press the ▲button to read the next data record.
3. Holding down the ▲button accelerates the rate of increment. The record number will roll over to
1 when the last record is reached.
9
Este manual sirve para los siguientes modelos
1
Tabla de contenidos
Otros manuales de Instrumento de medición de Megger
Megger
Megger MCCV6000-18 Manual de usuario
Megger
Megger MPQ1000 Manual de usuario
Megger
Megger TDR2000/3 Manual de usuario
Megger
Megger VF3 Manual de usuario
Megger
Megger MPQ1000 Manual de usuario
Megger
Megger DLRO10HD Manual de usuario
Megger
Megger MPQ1000 Manual de usuario
Megger
Megger EGIL200 Series Manual de usuario
Megger
Megger VCLAMP Manual de usuario
Megger
Megger MPQ1000 Manual de usuario
Megger
Megger TDR2000/3 Manual de usuario
Megger
Megger ATEC 210415 Series Manual de usuario
Megger
Megger BD-59095 Manual de usuario
Megger
Megger DLRO10HD Manual de usuario
Megger
Megger BERT-20E1 Manual de usuario
Megger
Megger DCM305E Manual de usuario
Megger
Megger IDAX 300 Manual de usuario
Megger
Megger DLRO100E Manual de usuario
Megger
Megger PAM410 Manual de usuario
Megger
Megger MOM690 Manual de usuario
Manuales populares de Instrumento de medición de otras marcas
Endress+Hauser
Endress+Hauser Proline Promag 50 Especificaciones técnicas
Siemens
Siemens SITRANS F Coriolis FCT030 Manual de lista de piezas
KLINGER
KLINGER CMF V Series Manual de usuario
EXFO
EXFO FTB-2 Manual de operación y mantenimiento
Keysight
Keysight M8290A Manual de usuario
ADTEK
ADTEK MW-5 Manual de usuario