Gossen MetraWatt GEOHM ERP-1 User manual

Operating Instructions
GEOHM ERP-1
Adapter for flexible AC Current Sensors GEOHM FLEX 1-3
3-447-062-03
1
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Inhalt
1Safety............................................................................................................................................... 3
2Description of the adapter GEOHM ERP-1................................................................................... 4
3Measurements ................................................................................................................................ 5
4Power supply of GEOHM ERP-1 ................................................................................................. 10
4.1 Monitoring the power supply voltage.......................................................................................... 10
4.2 Replacing (rechargeable) batteries............................................................................................ 10
4.3 Charging the reachargeable batteries........................................................................................ 10
5Cleaning and maintenance.......................................................................................................... 11
6Storage .......................................................................................................................................... 11
7Dismantling and Disposal............................................................................................................ 11
8Technical specifications.............................................................................................................. 12
8.1 Basic data................................................................................................................................... 12
8.2 Additional data............................................................................................................................ 14
9Scope of Delivery ......................................................................................................................... 15
10 Optional accessories ................................................................................................................... 15
11 Device Return and Environmentally Compatible Disposal...................................................... 15
12 Repair and Replacement Parts Service, Calibration Center and Rental Instrument Service15
13 Product support............................................................................................................................ 15

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1Safety
GEOHM ERP-1 adapter is designed to adapt earth tester GEOHM PRO and XTRA for the measurements
of earth resistance of various objects e.g. power pillars, using flexible AC current sensors (GEOHM FLEX
1-3). The adapter is designed to work with earth tester GEOHM PRO and XTRA that provide the user
with a choice of performing the measurement using 3-wire method with flexible AC current sensors. In
order to ensure correct operation, the following recommendations must be observed:
•Before you proceed to operate the GEOHM ERP 1 adapter, acquaint yourself thoroughly with this
manual and observe the safety regulations and specifications provided by the producer.
•Any application that differs from those specified in the present manual may result in a damage to the
adapter and constitute a source of danger for the user.
•The Adapter should be operated only by suitably qualified persons having the necessary permissions
to carry out measurements on electrical systems. Operating the Adapter by unauthorised personnel
may result in damage to the device and constitute a source of danger for the user.
•Using this manual does not exclude the need to comply with occupational health and safety
regulations and with other relevant fire regulations required during the performance of a particular type
of work. Before starting the work with the device in special environments, e.g. potentially fire-
risk/explosive environment, it is necessary to consult it with the person responsible for health and
safety.
⇒it is damaged and completely or partially out of order,
⇒its cords and cables have damaged insulation,
⇒it has been stored for an excessive period of time in disadvantageous conditions (e.g. excessive
humidity). After moving the device from a cool to a warm place with a high level of relative
humidity, do not start measurements until the device is warmed up to the ambient
temperature (approximately 30 minutes).
•Before measurement, it must be assured that the cables are connected to the appropriate
measurement sockets
•Do not operate the adapter with an open or incorrectly closed battery (accumulator) compartment or
power it from other sources than those specified in the present manual.
•Repairs may only be carried out by our service department (see address in section 12).
•The device meets the requirements of EN 61010-1 and EN 61557.
Note:
The manufacturer reserves the right to introduce changes in the
design, accessories and technical data of the adapter.
Note:
GEOHM ERP-1 Adapter is not a stand-alone measuring device. This is
an accessory designed to work with earth tester GEOHM PRO und
GEOHM XTRA.

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2Description of the adapter GEOHM ERP-1
Meaning of symbols on the adapter
CAT IV 300 V
Measuring category CAT IV 300 V device
Protection category II device
This device may not be disposed of with the trash.
Further information regarding the WEEE mark can be accessed on
the Internet at www.gossenmetrawatt.com by entering the search
term „WEEE“.
Indicates European conformity
Warning concerning a point of danger
(Attention: observe documentation)
Switching the
adapter ON/OFF
Selected flexible AC
current sensor
connected to the
device
Selected number
of flexible AC
current sensor wraps
around the pole leg
LEDs indicating the
number of flexible AC
current sensors wraps
around the pole leg
LEDs indicating
selected type of flexible
AC current sensors:
F = GEOHM FLEX 1
FS = GEOHM FLEX 2
FSX = GEOHM FLEX 3
LED indicating
exceeded level of
interference
LED indicating low
battery level
Terminal for connecting
the cable of flexible AC
current sensors
Cable for connecting
the adapter to the
plug in the earth
tester

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3Measurements
Note:
Before the measurement arrange the spacing of the electrodes and
the test leads taking into account considerable distances. In case of
truss structures, the distance between the legs at their base may
exceed a few meters. The spot of connecting the earth tester to the
structure with a cable from terminal E, should be free of dirt and
contaminants such as paint, rust, etc., as they may affect the
measurement result.
1. Turn the adapter ON by pressing button.
2. LED will light up for 5 seconds indicating the stabilization process of the earth tester.
3. LED will turn off and at the same time LEDs for selecting flexible AC current sensors and
indicating the number of wraps around the structure leg will light up: and .
4. Connect the adapter to earth tester using the cable (length: 2 m) coming out from the terminal
marked with letters . This cable is an integral part of GEOHM ERP-1 adapter.
5. Connect flexible AC current sensors to the adapter using the cable coming out from the terminal
marked with symbol .
6. Press button on the adapter to select the type of flexible AC current sensors - follow the
labelling on the current sensors.
7. Press button on the adapter to specify the number of flexible AC current sensors wraps
around the leg of the structure/object.
8. On the earth tester select the measurement method as 3p+clamps, setting the rotational
function selector in the position shown here: .
9. Flexible AC current sensors connected to ERP-1 adapter should be wrapped around the leg of
the structure and around the steel strip (hoop) - if present - below the connecting point of cable E
to the structure leg. (Remember that flexible AC current sensors should not be placed directly
onto the test leads as their interference may impact the measurement results). Wrap the flexible
AC current sensors as many times as its possible due to their length (max 4 times).
Note:
When wrapping the flexible AC current sensors around the leg of the
tested structure, remember that the arrow stamped on current
sensors (indicating the direction of current flow) should be downward
(indicating the ground).
10. Trigger the measurement on earth tester by pressing START button, after selecting the
measuring voltage and frequency of the tested network.
11. After completing the measurement on the first leg of the structure/object (when there is more
than one leg), proceed to perform similar measurement on the next leg.

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12. After obtaining the results of earth resistance for each leg, calculate the resultant resistance of
the whole structure, using the following formula.
n
E
RR
R1
...
11
1
++
=
, [1]
where:
RE– resultant resistance of the object,
R1– resistance of the first leg of the object,
Rn– resistance of the last leg of the object,
n – number of legs of the object.
Note:
In case of measurements on a damaged structure or on a structure
with defective grounding system, the result calculated with the above
formula [1] may be burdened with a considerable error.
IE1…IE4 – current flowing to the ground through the individual legs of the pole
IS– current flowing upwards to the lightning protection wire
E, S, H –markings on the meter sockets
Fig. 1 Schematic diagram of the static resistance measurement on electricity poles using flexible AC
current sensors and earth tester GEOHM PRO or GEOHM XTRA.

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Note:
Before using flexible AC current sensors for the first time, they
should be calibrated according to the description included in the
operating instructions of earth tester. Repeat the procedure each time
you change the flexible AC current sensors. It is recommended to
perform the calibration every time the current sensor type is changed.
The number of wraps (coils) of current sensors around the leg of the
pole during the measurement should be identical to the number of
wraps used during their calibration. This will ensure using the
appropriate calibration factor during the measurements.
APPENDIX for earth testers GEOHM PRO and GEOHM XTRA
As additional functions are available in earth testers GEOHM PRO and GEOHM XTRA (measurements
with flexible AC current sensors), the manufacturer provided an additional option for automatic calculation
of the resultant resistance of the earth tester.
a)After selecting 3P+clamps, the following screen is displayed:
b)After pressing F2 button, the window for current sensors is shown. You may select between hard
clams (C-3) and ERP-1 adapter by operating buttons , . Accept your choice by pressing
ENTER. Exit without saving the change by pressing ESC.
c)After pressing F3 you may select the number of legs of the tested structure/object using buttons ,
. Accept your choice by pressing ENTER. Exit without saving the change by pressing ESC.

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d)After selecting an object with four legs the following screen is shown. After connecting the flexible
AC current sensors to ERP-1 adapter and connecting the adapter to the earth tester; when the
number of wraps and type of current sensors are set, the right side of the screen will show the
following values: UN– interference voltage, fN– interference frequency and IL– leakage current:
e)Press START button to display the following screen. Follow the command on the screen and fix the
clamps to the first leg (if not already done). The measurement will be triggered by pressing again
START button.
f) This screen is shown for 5 seconds from the moment of displaying calculated R1value, then screen
"before the second measurement" will be shown. You may recall the last measurement result by
pressing ENTER (the screen with the first measurement is shown for 5 seconds).
Similarly to the situation before the first measurement. The same applies before the measurement
on third and fourth leg.

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g)After completing the measurements on the last leg of the structure and after displaying (for 5
seconds) the resistance result (R4), the following screen will be displayed:
After completing a series of measurements (on each leg), the screen will display the resultant earth
resistance RE. Use buttons and to change results displayed by the auxiliary screen on the
right.

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4Power supply of GEOHM ERP-1
4.1 Monitoring the power supply voltage
The adapter is powered by three 1.5 V LR6 batteries or by three 1.2 V LR6 rechargeable batteries of
NiMH type. When BAT LED is light up, it indicates the need to replace the batteries or to recharge the
rechargeable batteries.
4.2 Replacing (rechargeable) batteries
To replace the (rechargeable) batteries:
•Disconnect current sensors and switch the adapter off.
•Unscrew the screw and remove the cover of the battery compartment (in the bottom of the housing).
•Replace all (rechargeable) batteries, observing the correct polarity.
•Install the cover back and fix it with the screw.
CAUTION!
Do not use the adapter when the battery compartment is removed or
open. Do not power the adapter from other sources than those
mentioned in this manual.
4.3 Charging the reachargeable batteries
Rechargeable batteries must be recharged in an external charger.